update version number for new release

Recipe parity with CC: Tweaked

.github/workflows/main-ci.yml

@@ -12,11 +12,10 @@ jobs:
     - name: Checkout submodules
       run: git submodule update --init --recursive
 
-
-    - name: Set up Java 8
+    - name: Set up Java 16
       uses: actions/setup-java@v1
       with:
-        java-version: 8
+        java-version: 16
 
     - name: Cache gradle dependencies
       uses: actions/cache@v2

.gitignore

@@ -21,3 +21,4 @@
 .gradle
 *.DS_Store
 .project
+*.launch

.gitpod.Dockerfile

@@ -16,4 +16,4 @@ RUN sudo apt-get -q update && \
     sudo apt install -yq openjdk-8-jdk openjdk-16-jdk
 
 # This is so that you can use java 8 until such a time as you switch to java 16
-RUN sudo update-java-alternatives --set java-1.8.0-openjdk-amd64
+RUN sudo update-java-alternatives --set java-1.16.0-openjdk-amd64

README.md

@@ -1,71 +1,74 @@
 <img src="logo.png" alt="CC: Restitched" width="100%"/>
 
-[![Current build status](https://github.com/Merith-TK/cc-restitched/workflows/Build/badge.svg)](https://github.com/Merith-TK/cc-restitched/actions "Current build status")
-[![Download CC: Restitched  on CurseForge](http://cf.way2muchnoise.eu/title/cc-restitched.svg)](https://www.curseforge.com/minecraft/mc-mods/cc-restitched-updated "Download CC: Restitched on CurseForge")
-[![Gitpod ready-to-code](https://img.shields.io/badge/Gitpod-ready--to--code-908a85?logo=gitpod)](https://gitpod.io/#https://github.com/Merith-TK/cc-restitched)
+[![Current build status](https://github.com/cc-tweaked/cc-restitched/workflows/Build/badge.svg)](https://github.com/cc-tweaked/cc-restitched/actions "Current build status")
+[![Download CC: Restitched  on CurseForge](https://camo.githubusercontent.com/07622e6662ef5ead080c4840ef6514a34e079d63015f7e51c977a55b1881dfb9/687474703a2f2f63662e776179326d7563686e6f6973652e65752f7469746c652f63632d726573746974636865642e737667)](https://www.curseforge.com/minecraft/mc-mods/cc-restitched "Download CC:  Restitched on CurseForge")
+[![Gitpod ready-to-code](https://img.shields.io/badge/Gitpod-ready--to--code-908a85?logo=gitpod)](https://gitpod.io/#https://github.com/cc-tweaked/cc-restitched/tree/1.17-alpha)
 
-# CC:R Version VS CC:T Version
-CC:R Strives to maintain perfect pairity with CC:T, however in some cases this is not possible, so CC:R might have a "newer" version than what CC:T has, these newer versions will be primarily bugfixes and the like because fabric is "weird" when porting a forge mod
+# CC: R Version VS CC: T Version
+CC: R Strives to maintain perfect pairity with CC: T, however in some cases this is not possible, so CC: R might have a "newer" version than what CC: T has, these newer versions will be primarily bugfixes and the like because [Fabric](https://fabricmc.net/) is "weird" when porting a Forge mod.
 
 ## What is CC: Restiched
-This is an fork of [Zundrel/cc-tweaked-fabric](https://github.com/Zundrel/cc-tweaked-fabric) who's goal was to port [SquidDev-CC/CC-Tweaked](https://github.com/SquidDev-CC/CC-Tweaked) to the [Fabric](https://fabricmc.net/) modloader. I picked up maintaining the mod because the team working on Zundrel's fork, admitted they had gotten lethargic so I picked it up to make it equal with CC:T
+This is an fork of [Zundrel/cc-tweaked-fabric](https://github.com/Zundrel/cc-tweaked-fabric) who's goal was to port [SquidDev-CC/CC-Tweaked](https://github.com/SquidDev-CC/CC-Tweaked) to the [Fabric](https://fabricmc.net/) modloader. I picked up maintaining the mod because the team working on Zundrel's fork can no longer mantain it so, I picked it up to make it as equal as possible with CC: T.
 
 ## Resource Packs
-This mod includes textures that are more in-line with the style of Mojang's new texture-artist, Jappa. If you prefer the original textures, enable the "Classic" resource pack provided by the mod.
+This mod includes textures that are more in-line with the style of Mojang's new texture-artist, Jappa. If you prefer the original textures, enable the "Classic" resource pack.
 
 <img src="https://raw.githubusercontent.com/3prm3/cc-pack/main/pack.png" alt="CC: Restitched" width="16"  height="16"/> [3prm3/cc-pack](https://github.com/3prm3/cc-pack/)
 We also have a second resourcepack made by [3prm3](https://github.com/3prm3), it features a complete overhaul and can be enabled by enabling the `overhaul` resource pack, go check out his resource pack over here!
 
-# Conflicts
-Currently Iris and Canvas Shaders are Incompatible with this mod,
- - Iris has transparent monitors, and when a computer displays something on the monitor, the face becomes black
- - Canvas... uhm
-	- Computer Terminals are 100% unusable and scuffed
-		- <img src="https://user-images.githubusercontent.com/16393543/120464345-ab619b00-c351-11eb-9dfb-e68ddc93de5e.png">
-	- Monitors break with either rendering option
-		- TBO
-			- Just crashes on world load
-		- VBO
-			- <img src="https://user-images.githubusercontent.com/16393543/120475933-d999a780-c35e-11eb-9d94-ef4e5988ad5f.png">
+# Does this work with shaders/[Sodium?](https://github.com/CaffeineMC/sodium-fabric)
+* [ YES ] Sodium
+* [ YES ] Optifine
+	* Works with VBO Rendering (automatically set)
+	* No issues
+* [ EHH ] Iris Shaders
+	* "Works" with TBO Rendering (Default)
+	* Crashes with VBO Rendering
+	* <details>
+		<summary>Shaders are broken</summary>
+
+		* Shaders will cause varrying results ranging from monitors being invisible, to straight up crashing.
+		* Not using shaders will result in odd Z-Fighting of the monitor display and the transparent texture
+			- ![](https://user-images.githubusercontent.com/10422110/136869483-91824c5f-841f-4316-bfb1-2412477a29ee.png)
+			- ![](https://user-images.githubusercontent.com/10422110/136869535-a16581a3-5e0a-4632-923f-c8de8cc8a6ea.png)
+		</details>
+* [ YES ] Canvas
+	* Works with TBO Rendering (Default)
+	* Scuffed with VBO Rendering
+	* <details>
+		<summary>VBO is broken</summary>
+
+  		Monitors are just... scuffed beyond belief.
+		- ![](https://i.imgur.com/JVNZ2Pn.png)
+		- ![](https://i.imgur.com/SXXpr54.png)
+			* The content to the left is supposed to be on the monitors to the right, also the bottom one is supposed to `black/white` not colored.
+		* Turtle Texture for some reason?
+			- ![](https://i.imgur.com/OEmZXsx.png)
+		</details>
+
 ## Contributing
-Any contribution is welcome, be that using the mod, reporting bugs or contributing code. In order to start helping develop CC:R there are a few rules
-1) Any updates that port commits from CC:T, ***MUST*** follow the format defined in [patchwork.md](patchwork.md) otherwise they will not be accepted,
-	* Commit Message must be the same as it is in CC:T,
-	* patchwork.md must be updated in the following format
-	> Comments, optional but useful if you had to do something 	differently than in CC:T outside of [Fabric](https://fabricmc.net/)/[Forge](https://mcforge.readthedocs.io/en/1.16.x/) differences
-	>
-	> \`\`\`
-	>
-	>commitID
-	>
-	> commit title
-	>
-	> commit desc
-	>
-	> \`\`\`
-2) Follow the [Fabric](https://fabricmc.net/) programming guidelines as close as possible. This means you have to use [`loom`](https://fabricmc.net/wiki/tutorial:mappings) mappings,
-3) You cannot intentionally implement bugs and security vulnerabilities
-4) Unless the commit is a ["patchwork"](https://github.com/Merith-TK/cc-restitched/blob/fabric/patchwork.md) compliant commit, (IE: taken from CC:T), the lua code is off limits
+Any contribution is welcome, be that using the mod, reporting bugs or contributing code. In order to start helping develop CC: R there are a few rules;
+1) Follow the [Fabric](https://fabricmc.net/) programming guidelines as close as possible. This means you have to use [`loom`](https://fabricmc.net/wiki/tutorial:mappings) mappings, if you use anything else, your code will be rejected.
+2) You cannot intentionally implement bugs and security vulnerabilities.
+3) Unless the code is taken directly from CC: Tweaked, `lua` code is offlimits from alteration.
+
 ## Bleeding Edge Builds
-Bleeding edge builds can be found [here](https://github.com/Merith-TK/cc-restitched/actions) at Github Actions.
+Bleeding edge builds can be found [here](https://github.com/cc-tweaked/cc-restitched/actions) at Github Actions.
 
 ## Community
-If you need help getting started with CC: Tweaked, want to show off your latest project, or just want to chat about ComputerCraft, here is the [Forum](https://forums.computercraft.cc/) and the [Discord](https://discord.gg/H2UyJXe)
+If you need help getting started with CC: Restitched, want to show off your latest project, or just want to chat about ComputerCraft, here is the [Forum](https://forums.computercraft.cc/) and the [Discord](https://discord.gg/H2UyJXe).
 
-## Known Issues
+## Known Bugs/Issues
 Main Known issue
-* Mods that add blocks that can be used as peripherals for CC:T On forge, don't work with CC:R.
-	* This is because of the differences between forge and fabric, and that mod devs, to my knowledge have not agreed upon a standard method in which to implement cross compatibility between mods,
-* [Fixed (d10f297c): please report if bug persists]</br> ~~Storage Peripherals throw a java "StackOverflowError" when using `pushItems()`,~~
-    * ~~Work around, you are probably using `pushItems(chest, 1)` or similar. please use `pushItems(chest, 1, nil, 1)`.~~
-* Computers will not run built in commands, saying "File not found"
-    * This is a know bug, dont know what causes it, but just restart the computer (`ctrl+r` for one second) and it will work again
-    * Occurs when server runs `/reload` or a datapack is updated
+* Mods that add blocks that can be used as peripherals for CC: T on Forge, don't work with CC: R.
+	* This is because of the differences between Forge and [Fabric](https://fabricmc.net/), and that mod devs, to my knowledge have not agreed upon a standard method in which to implement cross compatibility between mods,
+* Occasionally a computer will say "File not found" when running a built in program, this is normal just hold `crtl+r` to reboot it.
+	* We do not know what causes it directly, however it happens when the world is `/reload`ed, and currently running programs are not affected so nothing *should break*
 
 ## Perpherals
-Unfortunately, unlike the original CC:Tweaked project, CC:Restitched, does not have any actual peripheral mods, currently the only one we have is an example for mod devs to get started with making/adding the peripheral API to their mods!
+Unfortunately, unlike the original CC: Tweaked project, CC: Restitched, does not have any actual peripheral mods, currently the only one we have is an example for mod devs to get started with making/adding the peripheral API to their mods!
 
-If your a mod dev made a mod with CC:R peripheral support, OR if your a player who found a mod with CC:R support, please open an [issue here](https://github.com/Merith-TK/cc-restitched/issues/new?assignees=&labels=peripheralShoutout&template=peripheral_shoutout.md) to let us know so we can add it to the list!
+If you're a mod dev, made a mod with CC: R peripheral support OR if you're a player who found a mod with CC: R support, please open an [issue here](https://github.com/cc-tweaked/cc-restitched/issues/new?assignees=&labels=peripheralShoutout&template=peripheral_shoutout.md) to let us know so we can add it to the list!
 
-* ![icon](https://raw.githubusercontent.com/Toad-Dev/cc-peripheral-test/master/src/main/resources/assets/cc_test/textures/block/test_peripheral.png) [CC Peripheral Test](https://github.com/Toad-Dev/cc-peripheral-test)
+* ![icon](https://raw.githubusercontent.com/Toad-Dev/cc-peripheral-test/master/src/main/resources/assets/cc_test/textures/block/test_peripheral.png) [CC Peripheral Test [1.16.5]](https://github.com/Toad-Dev/cc-peripheral-test)
 	* This is an example mod for how to make peripherals that work as a block, or as a turtle upgrade!

build.gradle

@@ -1,12 +1,16 @@
 plugins {
-    id 'fabric-loom' version '0.7-SNAPSHOT'
+    id 'fabric-loom' version '0.9-SNAPSHOT'
     id 'maven-publish'
     id "checkstyle"
-    id "com.github.hierynomus.license" version "0.15.0"
+    id "com.github.hierynomus.license" version "0.16.1"
 }
 
-sourceCompatibility = JavaVersion.VERSION_1_8
-targetCompatibility = JavaVersion.VERSION_1_8
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(16)
+        vendor = JvmVendorSpec.ADOPTOPENJDK
+    }
+}
 
 version = mod_version
 
@@ -16,19 +20,25 @@ archivesBaseName = "cc-restiched"
 repositories {
     mavenCentral()
     maven { url 'https://jitpack.io' }
+    maven { url 'https://api.modrinth.com/maven'}
     maven { url "https://maven.shedaniel.me/" }
+    maven { url "https://maven.terraformersmc.com/" }
     maven {
         name "SquidDev"
         url "https://squiddev.cc/maven"
     }
 }
 
+loom {
+    accessWidenerPath = file("src/main/resources/cc.accesswidener")
+}
+
 configurations {
     implementation.extendsFrom shade
 }
 
 dependencies {
-    checkstyle "com.puppycrawl.tools:checkstyle:8.25"
+    checkstyle 'com.puppycrawl.tools:checkstyle:8.45.1'
 
     minecraft "com.mojang:minecraft:${mc_version}"
     mappings "net.fabricmc:yarn:${mc_version}+build.${mappings_version}:v2"
@@ -38,7 +48,7 @@ dependencies {
     modApi("me.shedaniel.cloth:cloth-config-fabric:${cloth_config_version}") {
         exclude(group: "net.fabricmc.fabric-api")
     }
-    modImplementation "io.github.prospector:modmenu:${modmenu_version}"
+    modImplementation "com.terraformersmc:modmenu:${modmenu_version}"
     modImplementation "me.shedaniel.cloth.api:cloth-utils-v1:${cloth_api_version}"
 
     implementation 'com.electronwill.night-config:toml:3.6.3'
@@ -51,21 +61,16 @@ dependencies {
     include 'com.electronwill.night-config:toml:3.6.3'
     include "me.shedaniel.cloth:cloth-config-fabric:${cloth_config_version}"
 
-    modRuntime "me.shedaniel:RoughlyEnoughItems-api:5.12.248"
-    modRuntime "me.shedaniel:RoughlyEnoughItems:5.12.248"
+    modRuntime "me.shedaniel:RoughlyEnoughItems-api-fabric:6.0.254-alpha"
+    modRuntime "me.shedaniel:RoughlyEnoughItems-fabric:6.0.254-alpha"
 }
 
 processResources {
     inputs.property "version", project.version
 
-    from(sourceSets.main.resources.srcDirs) {
-        include "fabric.mod.json"
-        expand "version": project.version
-    }
-
-    from(sourceSets.main.resources.srcDirs) {
-        exclude "fabric.mod.json"
-    }
+	filesMatching("fabric.mod.json") {
+		expand "version": project.version
+	}
 }
 
 // ensure that the encoding is set to UTF-8, no matter what the system default is

config/checkstyle/checkstyle.xml

@@ -58,13 +58,13 @@
         <module name="SimplifyBooleanExpression" />
         <module name="SimplifyBooleanReturn" />
         <module name="StringLiteralEquality" />
-        <module name="UnnecessaryParentheses" />
+        <!-- <module name="UnnecessaryParentheses" /> -->
         <module name="UnnecessarySemicolonAfterTypeMemberDeclaration" />
         <module name="UnnecessarySemicolonInTryWithResources" />
         <module name="UnnecessarySemicolonInEnumeration" />
 
         <!-- Imports -->
-        <module name="CustomImportOrder" />
+        <!--<module name="CustomImportOrder" />-->
         <module name="IllegalImport" />
         <module name="RedundantImport" />
         <module name="UnusedImports" />

config/checkstyle/suppressions.xml

@@ -7,6 +7,9 @@
     <suppress checks="StaticVariableName" files=".*[\\/]ComputerCraft.java" />
     <suppress checks="StaticVariableName" files=".*[\\/]ComputerCraftAPI.java" />
 
+    <!-- Some shadowed fields in mixins can't be renamed -->
+    <suppress checks="StaticVariableName" files=".*[\\/]mixin[\\/].*" />
+
     <!-- The commands API is documented in Lua. -->
     <suppress checks="SummaryJavadocCheck" files=".*[\\/]CommandAPI.java" />
 </suppressions>

gradle.properties

@@ -2,16 +2,16 @@
 org.gradle.jvmargs=-Xmx1G
 
 # Mod properties
-mod_version=1.96.1-rc1
+mod_version=1.97.2
 
 # Minecraft properties
-mc_version=1.16.5
-mappings_version=9
+mc_version=1.17.1
+mappings_version=61
 
 # Dependencies
-cloth_config_version=4.11.26
-fabric_loader_version=0.11.3
-fabric_api_version=0.32.0+1.16
+cloth_config_version=5.0.34
+fabric_loader_version=0.11.7
+fabric_api_version=0.40.1+1.17
 jankson_version=1.2.0
-modmenu_version=1.16.9
-cloth_api_version=1.4.5
+modmenu_version=2.0.2
+cloth_api_version=2.0.54

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.9-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew.bat

@@ -1,89 +1,89 @@
-@rem
-@rem Copyright 2015 the original author or authors.
-@rem
-@rem Licensed under the Apache License, Version 2.0 (the "License");
-@rem you may not use this file except in compliance with the License.
-@rem You may obtain a copy of the License at
-@rem
-@rem      https://www.apache.org/licenses/LICENSE-2.0
-@rem
-@rem Unless required by applicable law or agreed to in writing, software
-@rem distributed under the License is distributed on an "AS IS" BASIS,
-@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-@rem See the License for the specific language governing permissions and
-@rem limitations under the License.
-@rem
-
-@if "%DEBUG%" == "" @echo off
-@rem ##########################################################################
-@rem
-@rem  Gradle startup script for Windows
-@rem
-@rem ##########################################################################
-
-@rem Set local scope for the variables with windows NT shell
-if "%OS%"=="Windows_NT" setlocal
-
-set DIRNAME=%~dp0
-if "%DIRNAME%" == "" set DIRNAME=.
-set APP_BASE_NAME=%~n0
-set APP_HOME=%DIRNAME%
-
-@rem Resolve any "." and ".." in APP_HOME to make it shorter.
-for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
-
-@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
-
-@rem Find java.exe
-if defined JAVA_HOME goto findJavaFromJavaHome
-
-set JAVA_EXE=java.exe
-%JAVA_EXE% -version >NUL 2>&1
-if "%ERRORLEVEL%" == "0" goto execute
-
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:findJavaFromJavaHome
-set JAVA_HOME=%JAVA_HOME:"=%
-set JAVA_EXE=%JAVA_HOME%/bin/java.exe
-
-if exist "%JAVA_EXE%" goto execute
-
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
-
-goto fail
-
-:execute
-@rem Setup the command line
-
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
-
-
-@rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
-
-:end
-@rem End local scope for the variables with windows NT shell
-if "%ERRORLEVEL%"=="0" goto mainEnd
-
-:fail
-rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
-rem the _cmd.exe /c_ return code!
-if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
-exit /b 1
-
-:mainEnd
-if "%OS%"=="Windows_NT" endlocal
-
-:omega
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

jitpack.yml

@@ -0,0 +1,5 @@
+before_install:
+  - wget https://github.com/sormuras/bach/raw/master/install-jdk.sh
+  - source ./install-jdk.sh --feature 16 --license GPL
+jdk:
+  - openjdk16

settings.gradle

@@ -1,6 +1,5 @@
 pluginManagement {
     repositories {
-        jcenter()
         maven {
             name = 'Fabric'
             url = 'https://maven.fabricmc.net/'

src/main/java/dan200/computercraft/ComputerCraft.java

@@ -9,6 +9,7 @@ package dan200.computercraft;
 import dan200.computercraft.api.turtle.event.TurtleAction;
 import dan200.computercraft.core.apis.http.options.Action;
 import dan200.computercraft.core.apis.http.options.AddressRule;
+import dan200.computercraft.shared.ComputerCraftRegistry.ModBlocks;
 import dan200.computercraft.shared.common.ColourableRecipe;
 import dan200.computercraft.shared.computer.core.ClientComputerRegistry;
 import dan200.computercraft.shared.computer.core.ServerComputerRegistry;
@@ -43,7 +44,6 @@ import java.util.EnumSet;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
 
-import static dan200.computercraft.shared.ComputerCraftRegistry.ModBlocks;
 import static dan200.computercraft.shared.ComputerCraftRegistry.init;
 
 public final class ComputerCraft implements ModInitializer
@@ -72,6 +72,8 @@ public final class ComputerCraft implements ModInitializer
     ) );
     public static int httpMaxRequests = 16;
     public static int httpMaxWebsockets = 4;
+    public static int httpDownloadBandwidth = 32 * 1024 * 1024;
+    public static int httpUploadBandwidth = 32 * 1024 * 1024;
 
     public static boolean enableCommandBlock = false;
     public static int modemRange = 64;
@@ -81,6 +83,7 @@ public final class ComputerCraft implements ModInitializer
     public static int maxNotesPerTick = 8;
     public static MonitorRenderer monitorRenderer = MonitorRenderer.BEST;
     public static double monitorDistanceSq = 4096;
+    public static int monitorDistance = 65;
     public static long monitorBandwidth = 1_000_000;
 
     public static boolean turtlesNeedFuel = true;

src/main/java/dan200/computercraft/api/IUpgradeBase.java

@@ -8,7 +8,7 @@ package dan200.computercraft.api;
 import dan200.computercraft.api.pocket.IPocketUpgrade;
 import dan200.computercraft.api.turtle.ITurtleUpgrade;
 import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.util.Identifier;
 
 import javax.annotation.Nonnull;
@@ -76,8 +76,8 @@ public interface IUpgradeBase
 
         // A more expanded form of ItemStack.areShareTagsEqual, but allowing an empty tag to be equal to a
         // null one.
-        CompoundTag shareTag = stack.getTag();
-        CompoundTag craftingShareTag = crafting.getTag();
+        NbtCompound shareTag = stack.getNbt();
+        NbtCompound craftingShareTag = crafting.getNbt();
         if( shareTag == craftingShareTag ) return true;
         if( shareTag == null ) return craftingShareTag.isEmpty();
         if( craftingShareTag == null ) return shareTag.isEmpty();

src/main/java/dan200/computercraft/api/client/TransformedModel.java

@@ -6,16 +6,16 @@
 
 package dan200.computercraft.api.client;
 
-import dan200.computercraft.fabric.mixin.AffineTransformationAccess;
 import net.fabricmc.api.EnvType;
 import net.fabricmc.api.Environment;
 import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.render.model.BakedModel;
 import net.minecraft.client.render.model.BakedModelManager;
 import net.minecraft.client.util.ModelIdentifier;
-import net.minecraft.client.util.math.AffineTransformation;
+import net.minecraft.util.math.AffineTransformation;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.math.Vec3f;
 
 import javax.annotation.Nonnull;
 import java.util.Objects;
@@ -73,22 +73,14 @@ public final class TransformedModel
     {
         matrixStack.push();
 
-        AffineTransformationAccess access = (AffineTransformationAccess) (Object) matrix;
-        if( access.getTranslation() != null )
-        {
-            matrixStack.translate( access.getTranslation().getX(), access.getTranslation().getY(), access.getTranslation().getZ() );
-        }
+        Vec3f translation = matrix.getTranslation();
+        matrixStack.translate( translation.getX(), translation.getY(), translation.getZ() );
 
         matrixStack.multiply( matrix.getRotation2() );
 
-        if( access.getScale() != null )
-        {
-            matrixStack.scale( access.getScale().getX(), access.getScale().getY(), access.getScale().getZ() );
-        }
+        Vec3f scale = matrix.getScale();
+        matrixStack.scale( scale.getX(), scale.getY(), scale.getZ() );
 
-        if( access.getRotation1() != null )
-        {
-            matrixStack.multiply( access.getRotation1() );
-        }
+        matrixStack.multiply( matrix.getRotation1() );
     }
 }

src/main/java/dan200/computercraft/api/lua/ILuaContext.java

@@ -9,17 +9,18 @@ package dan200.computercraft.api.lua;
 import javax.annotation.Nonnull;
 
 /**
- * An interface passed to peripherals and {@link IDynamicLuaObject}s by computers or turtles, providing methods that allow the peripheral call to interface
- * with the computer.
+ * An interface passed to peripherals and {@link IDynamicLuaObject}s by computers or turtles, providing methods
+ * that allow the peripheral call to interface with the computer.
  */
 public interface ILuaContext
 {
     /**
-     * Queue a task to be executed on the main server thread at the beginning of next tick, but do not wait for it to complete. This should be used when you
-     * need to interact with the world in a thread-safe manner but do not care about the result or you wish to run asynchronously.
+     * Queue a task to be executed on the main server thread at the beginning of next tick, but do not wait for it to
+     * complete. This should be used when you need to interact with the world in a thread-safe manner but do not care
+     * about the result or you wish to run asynchronously.
      *
-     * When the task has finished, it will enqueue a {@code task_completed} event, which takes the task id, a success value and the return values, or an
-     * error message if it failed.
+     * When the task has finished, it will enqueue a {@code task_completed} event, which takes the task id, a success
+     * value and the return values, or an error message if it failed.
      *
      * @param task The task to execute on the main thread.
      * @return The "id" of the task. This will be the first argument to the {@code task_completed} event.
@@ -27,4 +28,18 @@ public interface ILuaContext
      * @see LuaFunction#mainThread() To run functions on the main thread and return their results synchronously.
      */
     long issueMainThreadTask( @Nonnull ILuaTask task ) throws LuaException;
+
+    /**
+     * Queue a task to be executed on the main server thread at the beginning of next tick, waiting for it to complete.
+     * This should be used when you need to interact with the world in a thread-safe manner.
+     *
+     * Note that the return values of your task are handled as events, meaning more complex objects such as maps or
+     * {@link IDynamicLuaObject} will not preserve their identities.
+     *
+     * @param task The task to execute on the main thread.
+     * @return The objects returned by {@code task}.
+     * @throws LuaException If the task could not be queued, or if the task threw an exception.
+     */
+    @Nonnull
+    MethodResult executeMainThreadTask( @Nonnull ILuaTask task ) throws LuaException;
 }

src/main/java/dan200/computercraft/api/lua/ILuaObject.java

@@ -1,18 +0,0 @@
-/*
- * This file is part of the public ComputerCraft API - http://www.computercraft.info
- * Copyright Daniel Ratcliffe, 2011-2021. This API may be redistributed unmodified and in full only.
- * For help using the API, and posting your mods, visit the forums at computercraft.info.
- */
-package dan200.computercraft.api.lua;
-
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
-
-public interface ILuaObject
-{
-    @Nonnull
-    String[] getMethodNames();
-
-    @Nullable
-    Object[] callMethod( @Nonnull ILuaContext context, int method, @Nonnull Object[] arguments ) throws LuaException, InterruptedException;
-}

src/main/java/dan200/computercraft/api/pocket/AbstractPocketUpgrade.java

@@ -6,12 +6,15 @@
 
 package dan200.computercraft.api.pocket;
 
+import dan200.computercraft.shared.util.NonNullSupplier;
+import net.minecraft.item.Item;
 import net.minecraft.item.ItemConvertible;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.Identifier;
 import net.minecraft.util.Util;
 
 import javax.annotation.Nonnull;
+import java.util.function.Supplier;
 
 /**
  * A base class for {@link IPocketUpgrade}s.
@@ -22,27 +25,49 @@ public abstract class AbstractPocketUpgrade implements IPocketUpgrade
 {
     private final Identifier id;
     private final String adjective;
-    private final ItemStack stack;
+    private final NonNullSupplier<ItemStack> stack;
 
-    protected AbstractPocketUpgrade( Identifier id, ItemConvertible item )
-    {
-        this( id, Util.createTranslationKey( "upgrade", id ) + ".adjective", item );
-    }
-
-    protected AbstractPocketUpgrade( Identifier id, String adjective, ItemConvertible item )
-    {
-        this.id = id;
-        this.adjective = adjective;
-        stack = new ItemStack( item );
-    }
-
-    protected AbstractPocketUpgrade( Identifier id, String adjective, ItemStack stack )
+    protected AbstractPocketUpgrade( Identifier id, String adjective, NonNullSupplier<ItemStack> stack )
     {
         this.id = id;
         this.adjective = adjective;
         this.stack = stack;
     }
 
+    protected AbstractPocketUpgrade( Identifier id, NonNullSupplier<ItemStack> item )
+    {
+        this( id, Util.createTranslationKey( "upgrade", id ) + ".adjective", item );
+    }
+
+    protected AbstractPocketUpgrade( Identifier id, String adjective, ItemStack stack )
+    {
+        this( id, adjective, () -> stack );
+    }
+
+    protected AbstractPocketUpgrade( Identifier id, ItemStack stack )
+    {
+        this( id, () -> stack );
+    }
+
+    protected AbstractPocketUpgrade( Identifier id, String adjective, ItemConvertible item )
+    {
+        this( id, adjective, new CachedStack( () -> item ) );
+    }
+
+    protected AbstractPocketUpgrade( Identifier id, ItemConvertible item )
+    {
+        this( id, new CachedStack( () -> item ) );
+    }
+
+    protected AbstractPocketUpgrade( Identifier id, String adjective, Supplier<? extends ItemConvertible> item )
+    {
+        this( id, adjective, new CachedStack( item ) );
+    }
+
+    protected AbstractPocketUpgrade( Identifier id, Supplier<? extends ItemConvertible> item )
+    {
+        this( id, new CachedStack( item ) );
+    }
 
     @Nonnull
     @Override
@@ -62,6 +87,32 @@ public abstract class AbstractPocketUpgrade implements IPocketUpgrade
     @Override
     public final ItemStack getCraftingItem()
     {
-        return stack;
+        return stack.get();
+    }
+
+    /**
+     * Caches the construction of an item stack.
+     *
+     * @see dan200.computercraft.api.turtle.AbstractTurtleUpgrade For explanation of this class.
+     */
+    private static final class CachedStack implements NonNullSupplier<ItemStack>
+    {
+        private final Supplier<? extends ItemConvertible> provider;
+        private Item item;
+        private ItemStack stack;
+
+        CachedStack( Supplier<? extends ItemConvertible> provider )
+        {
+            this.provider = provider;
+        }
+
+        @Nonnull
+        @Override
+        public ItemStack get()
+        {
+            Item item = provider.get().asItem();
+            if( item == this.item && stack != null ) return stack;
+            return stack = new ItemStack( this.item = item );
+        }
     }
 }

src/main/java/dan200/computercraft/api/pocket/IPocketAccess.java

@@ -8,7 +8,7 @@ package dan200.computercraft.api.pocket;
 
 import dan200.computercraft.api.peripheral.IPeripheral;
 import net.minecraft.entity.Entity;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.util.Identifier;
 
 import javax.annotation.Nonnull;
@@ -73,7 +73,7 @@ public interface IPocketAccess
      * @see #updateUpgradeNBTData()
      */
     @Nonnull
-    CompoundTag getUpgradeNBTData();
+    NbtCompound getUpgradeNBTData();
 
     /**
      * Mark the upgrade-specific NBT as dirty.

src/main/java/dan200/computercraft/api/turtle/AbstractTurtleUpgrade.java

@@ -6,12 +6,15 @@
 
 package dan200.computercraft.api.turtle;
 
+import dan200.computercraft.shared.util.NonNullSupplier;
+import net.minecraft.item.Item;
 import net.minecraft.item.ItemConvertible;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.Identifier;
 import net.minecraft.util.Util;
 
 import javax.annotation.Nonnull;
+import java.util.function.Supplier;
 
 /**
  * A base class for {@link ITurtleUpgrade}s.
@@ -23,14 +26,9 @@ public abstract class AbstractTurtleUpgrade implements ITurtleUpgrade
     private final Identifier id;
     private final TurtleUpgradeType type;
     private final String adjective;
-    private final ItemStack stack;
+    private final NonNullSupplier<ItemStack> stack;
 
-    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, String adjective, ItemConvertible item )
-    {
-        this( id, type, adjective, new ItemStack( item ) );
-    }
-
-    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, String adjective, ItemStack stack )
+    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, String adjective, NonNullSupplier<ItemStack> stack )
     {
         this.id = id;
         this.type = type;
@@ -38,16 +36,40 @@ public abstract class AbstractTurtleUpgrade implements ITurtleUpgrade
         this.stack = stack;
     }
 
-    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, ItemConvertible item )
-    {
-        this( id, type, new ItemStack( item ) );
-    }
-
-    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, ItemStack stack )
+    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, NonNullSupplier<ItemStack> stack )
     {
         this( id, type, Util.createTranslationKey( "upgrade", id ) + ".adjective", stack );
     }
 
+    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, String adjective, ItemStack stack )
+    {
+        this( id, type, adjective, () -> stack );
+    }
+
+    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, ItemStack stack )
+    {
+        this( id, type, () -> stack );
+    }
+
+    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, String adjective, ItemConvertible item )
+    {
+        this( id, type, adjective, new CachedStack( () -> item ) );
+    }
+
+    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, ItemConvertible item )
+    {
+        this( id, type, new CachedStack( () -> item ) );
+    }
+
+    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, String adjective, Supplier<? extends ItemConvertible> item )
+    {
+        this( id, type, adjective, new CachedStack( item ) );
+    }
+
+    protected AbstractTurtleUpgrade( Identifier id, TurtleUpgradeType type, Supplier<? extends ItemConvertible> item )
+    {
+        this( id, type, new CachedStack( item ) );
+    }
 
     @Nonnull
     @Override
@@ -74,6 +96,32 @@ public abstract class AbstractTurtleUpgrade implements ITurtleUpgrade
     @Override
     public final ItemStack getCraftingItem()
     {
-        return stack;
+        return stack.get();
+    }
+
+    /**
+     * A supplier which converts an item into an item stack.
+     *
+     * Constructing item stacks is somewhat expensive due to attaching capabilities. We cache it if given a consistent item.
+     */
+    private static final class CachedStack implements NonNullSupplier<ItemStack>
+    {
+        private final Supplier<? extends ItemConvertible> provider;
+        private Item item;
+        private ItemStack stack;
+
+        CachedStack( Supplier<? extends ItemConvertible> provider )
+        {
+            this.provider = provider;
+        }
+
+        @Nonnull
+        @Override
+        public ItemStack get()
+        {
+            Item item = provider.get().asItem();
+            if( item == this.item && stack != null ) return stack;
+            return stack = new ItemStack( this.item = item );
+        }
     }
 }

src/main/java/dan200/computercraft/api/turtle/FakePlayer.java

@@ -23,20 +23,16 @@ import net.minecraft.network.packet.c2s.play.RequestCommandCompletionsC2SPacket;
 import net.minecraft.network.packet.c2s.play.VehicleMoveC2SPacket;
 import net.minecraft.recipe.Recipe;
 import net.minecraft.screen.NamedScreenHandlerFactory;
-import net.minecraft.screen.ScreenHandler;
 import net.minecraft.server.network.ServerPlayNetworkHandler;
 import net.minecraft.server.network.ServerPlayerEntity;
-import net.minecraft.server.network.ServerPlayerInteractionManager;
 import net.minecraft.server.world.ServerWorld;
 import net.minecraft.sound.SoundCategory;
 import net.minecraft.sound.SoundEvent;
 import net.minecraft.text.Text;
 import net.minecraft.util.Hand;
-import net.minecraft.util.collection.DefaultedList;
 import net.minecraft.util.math.ChunkPos;
 import net.minecraft.util.math.Vec3d;
 import net.minecraft.village.TradeOfferList;
-import net.minecraft.world.GameMode;
 
 import javax.annotation.Nullable;
 import javax.crypto.Cipher;
@@ -53,7 +49,7 @@ public class FakePlayer extends ServerPlayerEntity
 {
     public FakePlayer( ServerWorld world, GameProfile gameProfile )
     {
-        super( world.getServer(), world, gameProfile, new ServerPlayerInteractionManager( world ) );
+        super( world.getServer(), world, gameProfile );
         networkHandler = new FakeNetHandler( this );
     }
 
@@ -128,7 +124,7 @@ public class FakePlayer extends ServerPlayerEntity
     }
 
     @Override
-    public void openEditBookScreen( ItemStack stack, Hand hand )
+    public void useBook( ItemStack stack, Hand hand )
     {
     }
 
@@ -137,30 +133,30 @@ public class FakePlayer extends ServerPlayerEntity
     {
     }
 
-    @Override
-    public void onSlotUpdate( ScreenHandler container, int slot, ItemStack stack )
-    {
-    }
-
-    @Override
-    public void onHandlerRegistered( ScreenHandler container, DefaultedList<ItemStack> defaultedList )
-    {
-    }
-
-    @Override
-    public void onPropertyUpdate( ScreenHandler container, int key, int value )
-    {
-    }
+    //    @Override
+    //    public void onSlotUpdate( ScreenHandler container, int slot, ItemStack stack )
+    //    {
+    //    }
+    //
+    //    @Override
+    //    public void onHandlerRegistered( ScreenHandler container, DefaultedList<ItemStack> defaultedList )
+    //    {
+    //    }
+    //
+    //    @Override
+    //    public void onPropertyUpdate( ScreenHandler container, int key, int value )
+    //    {
+    //    }
 
     @Override
     public void closeHandledScreen()
     {
     }
 
-    @Override
-    public void updateCursorStack()
-    {
-    }
+    //    @Override
+    //    public void updateCursorStack()
+    //    {
+    //    }
 
     @Override
     public int unlockRecipes( Collection<Recipe<?>> recipes )
@@ -191,17 +187,17 @@ public class FakePlayer extends ServerPlayerEntity
     }
 
     @Override
-    public void method_14222( EntityAnchorArgumentType.EntityAnchor self, Entity entity, EntityAnchorArgumentType.EntityAnchor target )
+    public void lookAtEntity( EntityAnchorArgumentType.EntityAnchor self, Entity entity, EntityAnchorArgumentType.EntityAnchor target )
     {
     }
 
     @Override
-    protected void onStatusEffectApplied( StatusEffectInstance statusEffectInstance )
+    protected void onStatusEffectApplied( StatusEffectInstance statusEffectInstance, @Nullable Entity source )
     {
     }
 
     @Override
-    protected void onStatusEffectUpgraded( StatusEffectInstance statusEffectInstance, boolean particles )
+    protected void onStatusEffectUpgraded( StatusEffectInstance statusEffectInstance, boolean particles, @Nullable Entity source )
     {
     }
 
@@ -215,10 +211,10 @@ public class FakePlayer extends ServerPlayerEntity
     {
     }
 
-    @Override
-    public void setGameMode( GameMode gameMode )
-    {
-    }
+    //    @Override
+    //    public void setGameMode( GameMode gameMode )
+    //    {
+    //    }
 
     @Override
     public void sendMessage( Text message, MessageType type, UUID senderUuid )
@@ -232,15 +228,15 @@ public class FakePlayer extends ServerPlayerEntity
         return "[Fake Player]";
     }
 
-    @Override
-    public void sendResourcePackUrl( String url, String hash )
-    {
-    }
+    //    @Override
+    //    public void sendResourcePackUrl( String url, String hash )
+    //    {
+    //    }
 
-    @Override
-    public void onStoppedTracking( Entity entity )
-    {
-    }
+    //    @Override
+    //    public void onStoppedTracking( Entity entity )
+    //    {
+    //    }
 
     @Override
     public void setCameraEntity( Entity entity )
@@ -347,10 +343,5 @@ public class FakePlayer extends ServerPlayerEntity
         public void disableAutoRead()
         {
         }
-
-        @Override
-        public void setCompressionThreshold( int size )
-        {
-        }
     }
 }

src/main/java/dan200/computercraft/api/turtle/ITurtleAccess.java

@@ -12,7 +12,7 @@ import dan200.computercraft.api.lua.MethodResult;
 import dan200.computercraft.api.peripheral.IPeripheral;
 import dan200.computercraft.shared.util.ItemStorage;
 import net.minecraft.inventory.Inventory;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Direction;
 import net.minecraft.util.math.Vec3d;
@@ -255,7 +255,7 @@ public interface ITurtleAccess
      * @see #updateUpgradeNBTData(TurtleSide)
      */
     @Nonnull
-    CompoundTag getUpgradeNBTData( @Nullable TurtleSide side );
+    NbtCompound getUpgradeNBTData( @Nullable TurtleSide side );
 
     /**
      * Mark the upgrade-specific data as dirty on a specific side. This is required for the data to be synced to the client and persisted.

src/main/java/dan200/computercraft/client/ClientRegistry.java

@@ -77,7 +77,7 @@ public final class ClientRegistry
     }
 
     @SuppressWarnings( "NewExpressionSideOnly" )
-    public static void onModelBakeEvent( ResourceManager manager, Consumer<ModelIdentifier> out )
+    public static void onModelBakeEvent( ResourceManager manager, Consumer<Identifier> out )
     {
         for( String model : EXTRA_MODELS )
         {

src/main/java/dan200/computercraft/client/ClientTableFormatter.java

@@ -21,10 +21,6 @@ import org.apache.commons.lang3.StringUtils;
 
 import javax.annotation.Nullable;
 
-@SuppressWarnings( {
-    "MethodCallSideOnly",
-    "LocalVariableDeclarationSideOnly"
-} )
 public class ClientTableFormatter implements TableFormatter
 {
     public static final ClientTableFormatter INSTANCE = new ClientTableFormatter();

src/main/java/dan200/computercraft/client/SoundManager.java

@@ -0,0 +1,84 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.client;
+
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.sound.AbstractSoundInstance;
+import net.minecraft.client.sound.SoundInstance;
+import net.minecraft.client.sound.TickableSoundInstance;
+import net.minecraft.sound.SoundCategory;
+import net.minecraft.util.Identifier;
+import net.minecraft.util.math.Vec3d;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+public class SoundManager
+{
+    private static final Map<UUID, MoveableSound> sounds = new HashMap<>();
+
+    public static void playSound( UUID source, Vec3d position, Identifier event, float volume, float pitch )
+    {
+        var soundManager = MinecraftClient.getInstance().getSoundManager();
+
+        MoveableSound oldSound = sounds.get( source );
+        if( oldSound != null ) soundManager.stop( oldSound );
+
+        MoveableSound newSound = new MoveableSound( event, position, volume, pitch );
+        sounds.put( source, newSound );
+        soundManager.play( newSound );
+    }
+
+    public static void stopSound( UUID source )
+    {
+        SoundInstance sound = sounds.remove( source );
+        if( sound == null ) return;
+
+        MinecraftClient.getInstance().getSoundManager().stop( sound );
+    }
+
+    public static void moveSound( UUID source, Vec3d position )
+    {
+        MoveableSound sound = sounds.get( source );
+        if( sound != null ) sound.setPosition( position );
+    }
+
+    public static void reset()
+    {
+        sounds.clear();
+    }
+
+    private static class MoveableSound extends AbstractSoundInstance implements TickableSoundInstance
+    {
+        protected MoveableSound( Identifier sound, Vec3d position, float volume, float pitch )
+        {
+            super( sound, SoundCategory.RECORDS );
+            setPosition( position );
+            this.volume = volume;
+            this.pitch = pitch;
+            attenuationType = SoundInstance.AttenuationType.LINEAR;
+        }
+
+        void setPosition( Vec3d position )
+        {
+            x = (float) position.getX();
+            y = (float) position.getY();
+            z = (float) position.getZ();
+        }
+
+        @Override
+        public boolean isDone()
+        {
+            return false;
+        }
+
+        @Override
+        public void tick()
+        {
+        }
+    }
+}

src/main/java/dan200/computercraft/client/gui/ComputerScreenBase.java

@@ -0,0 +1,228 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.client.gui;
+
+import dan200.computercraft.ComputerCraft;
+import dan200.computercraft.client.gui.widgets.ComputerSidebar;
+import dan200.computercraft.client.gui.widgets.WidgetTerminal;
+import dan200.computercraft.shared.computer.core.ClientComputer;
+import dan200.computercraft.shared.computer.core.ComputerFamily;
+import dan200.computercraft.shared.computer.inventory.ContainerComputerBase;
+import dan200.computercraft.shared.computer.upload.FileUpload;
+import dan200.computercraft.shared.computer.upload.UploadResult;
+import dan200.computercraft.shared.network.NetworkHandler;
+import dan200.computercraft.shared.network.server.ContinueUploadMessage;
+import dan200.computercraft.shared.network.server.UploadFileMessage;
+import net.minecraft.client.gui.screen.ingame.HandledScreen;
+import net.minecraft.client.util.math.MatrixStack;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.text.Text;
+import net.minecraft.text.TranslatableText;
+import org.lwjgl.glfw.GLFW;
+
+import javax.annotation.Nonnull;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.SeekableByteChannel;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public abstract class ComputerScreenBase<T extends ContainerComputerBase> extends HandledScreen<T>
+{
+
+    private static final Text OK = new TranslatableText( "gui.ok" );
+    private static final Text CANCEL = new TranslatableText( "gui.cancel" );
+    private static final Text OVERWRITE = new TranslatableText( "gui.computercraft.upload.overwrite_button" );
+
+    protected WidgetTerminal terminal;
+    protected final ClientComputer computer;
+    protected final ComputerFamily family;
+
+    protected final int sidebarYOffset;
+
+    public ComputerScreenBase( T container, PlayerInventory player, Text title, int sidebarYOffset )
+    {
+        super( container, player, title );
+        computer = (ClientComputer) container.getComputer();
+        family = container.getFamily();
+        this.sidebarYOffset = sidebarYOffset;
+    }
+
+    protected abstract WidgetTerminal createTerminal();
+
+    @Override
+    protected final void init()
+    {
+        super.init();
+        client.keyboard.setRepeatEvents( true );
+
+        terminal = addDrawableChild( createTerminal() );
+        ComputerSidebar.addButtons( this, computer, this::addDrawableChild, x, y + sidebarYOffset );
+        setFocused( terminal );
+    }
+
+    @Override
+    public final void removed()
+    {
+        super.removed();
+        client.keyboard.setRepeatEvents( false );
+    }
+
+    @Override
+    public final void handledScreenTick()
+    {
+        super.handledScreenTick();
+        terminal.update();
+    }
+
+    @Override
+    public final boolean keyPressed( int key, int scancode, int modifiers )
+    {
+        // Forward the tab key to the terminal, rather than moving between controls.
+        if( key == GLFW.GLFW_KEY_TAB && getFocused() != null && getFocused() == terminal )
+        {
+            return getFocused().keyPressed( key, scancode, modifiers );
+        }
+
+        return super.keyPressed( key, scancode, modifiers );
+    }
+
+    @Override
+    public final void render( @Nonnull MatrixStack stack, int mouseX, int mouseY, float partialTicks )
+    {
+        renderBackground( stack );
+        super.render( stack, mouseX, mouseY, partialTicks );
+        drawMouseoverTooltip( stack, mouseX, mouseY );
+    }
+
+    @Override
+    public final boolean mouseDragged( double x, double y, int button, double deltaX, double deltaY )
+    {
+        return getFocused() != null && getFocused().mouseDragged( x, y, button, deltaX, deltaY ) || super.mouseDragged( x, y, button, deltaX, deltaY );
+    }
+
+    @Override
+    protected void drawForeground( @Nonnull MatrixStack transform, int mouseX, int mouseY )
+    {
+        // Skip rendering labels.
+    }
+
+    @Override
+    public void filesDragged( @Nonnull List<Path> files )
+    {
+        if( files.isEmpty() ) return;
+
+        if( computer == null || !computer.isOn() )
+        {
+            alert( UploadResult.FAILED_TITLE, UploadResult.COMPUTER_OFF_MSG );
+            return;
+        }
+
+        long size = 0;
+
+        List<FileUpload> toUpload = new ArrayList<>();
+        for( Path file : files )
+        {
+            // TODO: Recurse directories? If so, we probably want to shunt this off-thread.
+            if( !Files.isRegularFile( file ) ) continue;
+
+            try( SeekableByteChannel sbc = Files.newByteChannel( file ) )
+            {
+                long fileSize = sbc.size();
+                if( fileSize > UploadFileMessage.MAX_SIZE || (size += fileSize) >= UploadFileMessage.MAX_SIZE )
+                {
+                    alert( UploadResult.FAILED_TITLE, UploadResult.TOO_MUCH_MSG );
+                    return;
+                }
+
+                String name = file.getFileName().toString();
+                if( name.length() > UploadFileMessage.MAX_FILE_NAME )
+                {
+                    alert( UploadResult.FAILED_TITLE, new TranslatableText( "gui.computercraft.upload.failed.name_too_long" ) );
+                    return;
+                }
+
+                ByteBuffer buffer = ByteBuffer.allocateDirect( (int) fileSize );
+                sbc.read( buffer );
+                buffer.flip();
+
+                byte[] digest = FileUpload.getDigest( buffer );
+                if( digest == null )
+                {
+                    alert( UploadResult.FAILED_TITLE, new TranslatableText( "gui.computercraft.upload.failed.corrupted" ) );
+                    return;
+                }
+
+                buffer.rewind();
+                toUpload.add( new FileUpload( name, buffer, digest ) );
+            }
+            catch( IOException e )
+            {
+                ComputerCraft.log.error( "Failed uploading files", e );
+                alert( UploadResult.FAILED_TITLE, new TranslatableText( "gui.computercraft.upload.failed.generic", "Cannot compute checksum" ) );
+            }
+        }
+
+        if( toUpload.size() > UploadFileMessage.MAX_FILES )
+        {
+            alert( UploadResult.FAILED_TITLE, new TranslatableText( "gui.computercraft.upload.failed.too_many_files" ) );
+            return;
+        }
+
+        if( toUpload.size() > 0 )
+        {
+            UploadFileMessage.send( computer.getInstanceID(), toUpload );
+        }
+    }
+
+    public void uploadResult( UploadResult result, Text message )
+    {
+        switch( result )
+        {
+            case SUCCESS:
+                alert( UploadResult.SUCCESS_TITLE, message );
+                break;
+            case ERROR:
+                alert( UploadResult.FAILED_TITLE, message );
+                break;
+            case CONFIRM_OVERWRITE:
+                OptionScreen.show(
+                    client, UploadResult.UPLOAD_OVERWRITE, message,
+                    Arrays.asList(
+                        OptionScreen.newButton( CANCEL, b -> cancelUpload() ),
+                        OptionScreen.newButton( OVERWRITE, b -> continueUpload() )
+                    ),
+                    this::cancelUpload
+                );
+                break;
+        }
+    }
+
+    private void continueUpload()
+    {
+        if( client.currentScreen instanceof OptionScreen ) ((OptionScreen) client.currentScreen).disable();
+        NetworkHandler.sendToServer( new ContinueUploadMessage( computer.getInstanceID(), true ) );
+    }
+
+    private void cancelUpload()
+    {
+        client.setScreen( this );
+        NetworkHandler.sendToServer( new ContinueUploadMessage( computer.getInstanceID(), false ) );
+    }
+
+    private void alert( Text title, Text message )
+    {
+        OptionScreen.show( client, title, message,
+            Collections.singletonList( OptionScreen.newButton( OK, b -> client.setScreen( this ) ) ),
+            () -> client.setScreen( this )
+        );
+    }
+
+}

src/main/java/dan200/computercraft/client/gui/FixedWidthFontRenderer.java

@@ -6,22 +6,24 @@
 
 package dan200.computercraft.client.gui;
 
-import com.mojang.blaze3d.systems.RenderSystem;
 import dan200.computercraft.client.FrameInfo;
+import dan200.computercraft.client.render.RenderTypes;
 import dan200.computercraft.core.terminal.Terminal;
 import dan200.computercraft.core.terminal.TextBuffer;
 import dan200.computercraft.shared.util.Colour;
 import dan200.computercraft.shared.util.Palette;
 import net.minecraft.client.MinecraftClient;
-import net.minecraft.client.render.*;
-import net.minecraft.client.util.math.AffineTransformation;
+import net.minecraft.client.render.VertexConsumer;
+import net.minecraft.client.render.VertexConsumerProvider;
 import net.minecraft.util.Identifier;
+import net.minecraft.util.math.AffineTransformation;
 import net.minecraft.util.math.Matrix4f;
-import org.lwjgl.opengl.GL11;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
+import static dan200.computercraft.client.render.RenderTypes.FULL_BRIGHT_LIGHTMAP;
+
 public final class FixedWidthFontRenderer
 {
     public static final int FONT_HEIGHT = 9;
@@ -31,47 +33,16 @@ public final class FixedWidthFontRenderer
     public static final float BACKGROUND_END = (WIDTH - 4.0f) / WIDTH;
     private static final Matrix4f IDENTITY = AffineTransformation.identity()
         .getMatrix();
-    private static final Identifier FONT = new Identifier( "computercraft", "textures/gui/term_font.png" );
-    public static final RenderLayer TYPE = Type.MAIN;
+    public static final Identifier FONT = new Identifier( "computercraft", "textures/gui/term_font.png" );
 
 
     private FixedWidthFontRenderer()
     {
     }
 
-    public static void drawString( float x, float y, @Nonnull TextBuffer text, @Nonnull TextBuffer textColour, @Nullable TextBuffer backgroundColour,
-                                   @Nonnull Palette palette, boolean greyscale, float leftMarginSize, float rightMarginSize )
-    {
-        bindFont();
-
-        VertexConsumerProvider.Immediate renderer = MinecraftClient.getInstance()
-            .getBufferBuilders()
-            .getEntityVertexConsumers();
-        drawString( IDENTITY,
-            ((VertexConsumerProvider) renderer).getBuffer( TYPE ),
-            x,
-            y,
-            text,
-            textColour,
-            backgroundColour,
-            palette,
-            greyscale,
-            leftMarginSize,
-            rightMarginSize );
-        renderer.draw();
-    }
-
-    private static void bindFont()
-    {
-        MinecraftClient.getInstance()
-            .getTextureManager()
-            .bindTexture( FONT );
-        RenderSystem.texParameter( GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL11.GL_CLAMP );
-    }
-
     public static void drawString( @Nonnull Matrix4f transform, @Nonnull VertexConsumer renderer, float x, float y, @Nonnull TextBuffer text,
                                    @Nonnull TextBuffer textColour, @Nullable TextBuffer backgroundColour, @Nonnull Palette palette, boolean greyscale,
-                                   float leftMarginSize, float rightMarginSize )
+                                   float leftMarginSize, float rightMarginSize, int light )
     {
         if( backgroundColour != null )
         {
@@ -99,7 +70,7 @@ public final class FixedWidthFontRenderer
             {
                 index = '?';
             }
-            drawChar( transform, renderer, x + i * FONT_WIDTH, y, index, r, g, b );
+            drawChar( transform, renderer, x + i * FONT_WIDTH, y, index, r, g, b, light );
         }
 
     }
@@ -170,7 +141,7 @@ public final class FixedWidthFontRenderer
         return (float) ((rgb[0] + rgb[1] + rgb[2]) / 3);
     }
 
-    private static void drawChar( Matrix4f transform, VertexConsumer buffer, float x, float y, int index, float r, float g, float b )
+    private static void drawChar( Matrix4f transform, VertexConsumer buffer, float x, float y, int index, float r, float g, float b, int light )
     {
         // Short circuit to avoid the common case - the texture should be blank here after all.
         if( index == '\0' || index == ' ' )
@@ -187,26 +158,32 @@ public final class FixedWidthFontRenderer
         buffer.vertex( transform, x, y, 0f )
             .color( r, g, b, 1.0f )
             .texture( xStart / WIDTH, yStart / WIDTH )
+            .light( light )
             .next();
         buffer.vertex( transform, x, y + FONT_HEIGHT, 0f )
             .color( r, g, b, 1.0f )
             .texture( xStart / WIDTH, (yStart + FONT_HEIGHT) / WIDTH )
+            .light( light )
             .next();
         buffer.vertex( transform, x + FONT_WIDTH, y, 0f )
             .color( r, g, b, 1.0f )
             .texture( (xStart + FONT_WIDTH) / WIDTH, yStart / WIDTH )
+            .light( light )
             .next();
         buffer.vertex( transform, x + FONT_WIDTH, y, 0f )
             .color( r, g, b, 1.0f )
             .texture( (xStart + FONT_WIDTH) / WIDTH, yStart / WIDTH )
+            .light( light )
             .next();
         buffer.vertex( transform, x, y + FONT_HEIGHT, 0f )
             .color( r, g, b, 1.0f )
             .texture( xStart / WIDTH, (yStart + FONT_HEIGHT) / WIDTH )
+            .light( light )
             .next();
         buffer.vertex( transform, x + FONT_WIDTH, y + FONT_HEIGHT, 0f )
             .color( r, g, b, 1.0f )
             .texture( (xStart + FONT_WIDTH) / WIDTH, (yStart + FONT_HEIGHT) / WIDTH )
+            .light( light )
             .next();
     }
 
@@ -300,7 +277,7 @@ public final class FixedWidthFontRenderer
                 palette,
                 greyscale,
                 leftMarginSize,
-                rightMarginSize );
+                rightMarginSize, FULL_BRIGHT_LIGHTMAP );
         }
     }
 
@@ -328,7 +305,7 @@ public final class FixedWidthFontRenderer
                 b = (float) colour[2];
             }
 
-            drawChar( transform, buffer, x + cursorX * FONT_WIDTH, y + cursorY * FONT_HEIGHT, '_', r, g, b );
+            drawChar( transform, buffer, x + cursorX * FONT_WIDTH, y + cursorY * FONT_HEIGHT, '_', r, g, b, FULL_BRIGHT_LIGHTMAP );
         }
     }
 
@@ -342,14 +319,12 @@ public final class FixedWidthFontRenderer
     public static void drawTerminal( @Nonnull Matrix4f transform, float x, float y, @Nonnull Terminal terminal, boolean greyscale, float topMarginSize,
                                      float bottomMarginSize, float leftMarginSize, float rightMarginSize )
     {
-        bindFont();
-
         VertexConsumerProvider.Immediate renderer = MinecraftClient.getInstance()
             .getBufferBuilders()
             .getEntityVertexConsumers();
-        VertexConsumer buffer = renderer.getBuffer( TYPE );
+        VertexConsumer buffer = renderer.getBuffer( RenderTypes.TERMINAL_WITH_DEPTH );
         drawTerminal( transform, buffer, x, y, terminal, greyscale, topMarginSize, bottomMarginSize, leftMarginSize, rightMarginSize );
-        renderer.draw( TYPE );
+        renderer.draw();
     }
 
     public static void drawTerminal( float x, float y, @Nonnull Terminal terminal, boolean greyscale, float topMarginSize, float bottomMarginSize,
@@ -360,13 +335,12 @@ public final class FixedWidthFontRenderer
 
     public static void drawEmptyTerminal( float x, float y, float width, float height )
     {
+        Colour colour = Colour.BLACK;
         drawEmptyTerminal( IDENTITY, x, y, width, height );
     }
 
     public static void drawEmptyTerminal( @Nonnull Matrix4f transform, float x, float y, float width, float height )
     {
-        bindFont();
-
         VertexConsumerProvider.Immediate renderer = MinecraftClient.getInstance()
             .getBufferBuilders()
             .getEntityVertexConsumers();
@@ -378,44 +352,12 @@ public final class FixedWidthFontRenderer
                                           float height )
     {
         Colour colour = Colour.BLACK;
-        drawQuad( transform, renderer.getBuffer( TYPE ), x, y, width, height, colour.getR(), colour.getG(), colour.getB() );
+        drawQuad( transform, renderer.getBuffer( RenderTypes.TERMINAL_WITH_DEPTH ), x, y, width, height, colour.getR(), colour.getG(), colour.getB() );
     }
 
     public static void drawBlocker( @Nonnull Matrix4f transform, @Nonnull VertexConsumerProvider renderer, float x, float y, float width, float height )
     {
         Colour colour = Colour.BLACK;
-        drawQuad( transform, renderer.getBuffer( Type.BLOCKER ), x, y, width, height, colour.getR(), colour.getG(), colour.getB() );
-    }
-
-    private static final class Type extends RenderPhase
-    {
-        private static final int GL_MODE = GL11.GL_TRIANGLES;
-
-        private static final VertexFormat FORMAT = VertexFormats.POSITION_COLOR_TEXTURE;
-
-        static final RenderLayer MAIN = RenderLayer.of( "terminal_font", FORMAT, GL_MODE, 1024, false, false, // useDelegate, needsSorting
-            RenderLayer.MultiPhaseParameters.builder()
-                .texture( new RenderPhase.Texture( FONT,
-                    false,
-                    false ) ) // blur, minimap
-                .alpha( ONE_TENTH_ALPHA )
-                .lightmap( DISABLE_LIGHTMAP )
-                .writeMaskState( COLOR_MASK )
-                .build( false ) );
-
-        static final RenderLayer BLOCKER = RenderLayer.of( "terminal_blocker", FORMAT, GL_MODE, 256, false, false, // useDelegate, needsSorting
-            RenderLayer.MultiPhaseParameters.builder()
-                .texture( new RenderPhase.Texture( FONT,
-                    false,
-                    false ) ) // blur, minimap
-                .alpha( ONE_TENTH_ALPHA )
-                .writeMaskState( ALL_MASK )
-                .lightmap( DISABLE_LIGHTMAP )
-                .build( false ) );
-
-        private Type( String name, Runnable setup, Runnable destroy )
-        {
-            super( name, setup, destroy );
-        }
+        drawQuad( transform, renderer.getBuffer( RenderTypes.TERMINAL_BLOCKER ), x, y, width, height, colour.getR(), colour.getG(), colour.getB() );
     }
 }

src/main/java/dan200/computercraft/client/gui/GuiComputer.java

@@ -6,54 +6,43 @@
 
 package dan200.computercraft.client.gui;
 
-import com.mojang.blaze3d.systems.RenderSystem;
 import dan200.computercraft.ComputerCraft;
+import dan200.computercraft.client.gui.widgets.ComputerSidebar;
 import dan200.computercraft.client.gui.widgets.WidgetTerminal;
-import dan200.computercraft.client.gui.widgets.WidgetWrapper;
 import dan200.computercraft.client.render.ComputerBorderRenderer;
-import dan200.computercraft.shared.computer.core.ClientComputer;
-import dan200.computercraft.shared.computer.core.ComputerFamily;
-import dan200.computercraft.shared.computer.inventory.ContainerComputer;
+import dan200.computercraft.client.render.RenderTypes;
 import dan200.computercraft.shared.computer.inventory.ContainerComputerBase;
 import dan200.computercraft.shared.computer.inventory.ContainerViewComputer;
-import dan200.computercraft.shared.pocket.inventory.ContainerPocketComputer;
-import net.minecraft.client.gui.screen.ingame.HandledScreen;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.entity.player.PlayerInventory;
 import net.minecraft.text.Text;
-import org.lwjgl.glfw.GLFW;
 
 import javax.annotation.Nonnull;
 
 import static dan200.computercraft.client.render.ComputerBorderRenderer.BORDER;
-import static dan200.computercraft.client.render.ComputerBorderRenderer.MARGIN;
+import static dan200.computercraft.client.render.ComputerBorderRenderer.getTexture;
 
-public class GuiComputer<T extends ContainerComputerBase> extends HandledScreen<T>
+public final class GuiComputer<T extends ContainerComputerBase> extends ComputerScreenBase<T>
 {
-    protected final ComputerFamily family;
-    protected final ClientComputer computer;
     private final int termWidth;
     private final int termHeight;
 
-    protected WidgetTerminal terminal;
-    protected WidgetWrapper terminalWrapper;
-
-    protected GuiComputer( T container, PlayerInventory player, Text title, int termWidth, int termHeight )
+    private GuiComputer( T container, PlayerInventory player, Text title, int termWidth, int termHeight )
     {
-        super( container, player, title );
-        this.family = container.getFamily();
-        this.computer = (ClientComputer) container.getComputer();
+        super( container, player, title, BORDER );
         this.termWidth = termWidth;
         this.termHeight = termHeight;
-        this.terminal = null;
+
+        backgroundWidth = WidgetTerminal.getWidth( termWidth ) + BORDER * 2 + ComputerSidebar.WIDTH;
+        backgroundHeight = WidgetTerminal.getHeight( termHeight ) + BORDER * 2;
     }
 
-    public static GuiComputer<ContainerComputer> create( ContainerComputer container, PlayerInventory inventory, Text component )
+    public static GuiComputer<ContainerComputerBase> create( ContainerComputerBase container, PlayerInventory inventory, Text component )
     {
         return new GuiComputer<>( container, inventory, component, ComputerCraft.computerTermWidth, ComputerCraft.computerTermHeight );
     }
 
-    public static GuiComputer<ContainerPocketComputer> createPocket( ContainerPocketComputer container, PlayerInventory inventory, Text component )
+    public static GuiComputer<ContainerComputerBase> createPocket( ContainerComputerBase container, PlayerInventory inventory, Text component )
     {
         return new GuiComputer<>( container, inventory, component, ComputerCraft.pocketTermWidth, ComputerCraft.pocketTermHeight );
     }
@@ -63,96 +52,19 @@ public class GuiComputer<T extends ContainerComputerBase> extends HandledScreen<
         return new GuiComputer<>( container, inventory, component, container.getWidth(), container.getHeight() );
     }
 
-    protected void initTerminal( int border, int widthExtra, int heightExtra )
-    {
-        client.keyboard.setRepeatEvents( true );
-
-        int termPxWidth = termWidth * FixedWidthFontRenderer.FONT_WIDTH;
-        int termPxHeight = termHeight * FixedWidthFontRenderer.FONT_HEIGHT;
-
-        backgroundWidth = termPxWidth + MARGIN * 2 + border * 2 + widthExtra;
-        backgroundHeight = termPxHeight + MARGIN * 2 + border * 2 + heightExtra;
-
-        super.init();
-
-        terminal = new WidgetTerminal( client, () -> computer, termWidth, termHeight, MARGIN, MARGIN, MARGIN, MARGIN );
-        terminalWrapper = new WidgetWrapper( terminal, MARGIN + border + x, MARGIN + border + y, termPxWidth, termPxHeight );
-
-        children.add( terminalWrapper );
-        setFocused( terminalWrapper );
-    }
-
     @Override
-    protected void init()
+    protected WidgetTerminal createTerminal()
     {
-        initTerminal( BORDER, 0, 0 );
+        return new WidgetTerminal( computer,
+            x + ComputerSidebar.WIDTH + BORDER, y + BORDER, termWidth, termHeight
+        );
     }
-
-    @Override
-    public void render( @Nonnull MatrixStack stack, int mouseX, int mouseY, float partialTicks )
-    {
-        this.renderBackground( stack );
-        super.render( stack, mouseX, mouseY, partialTicks );
-        drawMouseoverTooltip( stack, mouseX, mouseY );
-    }
-
-    @Override
-    protected void drawForeground( @Nonnull MatrixStack transform, int mouseX, int mouseY )
-    {
-        // Skip rendering labels.
-    }
-
     @Override
     public void drawBackground( @Nonnull MatrixStack stack, float partialTicks, int mouseX, int mouseY )
     {
-        // Draw terminal
-        terminal.draw( terminalWrapper.getX(), terminalWrapper.getY() );
-
-        // Draw a border around the terminal
-        RenderSystem.color4f( 1, 1, 1, 1 );
-        client.getTextureManager()
-            .bindTexture( ComputerBorderRenderer.getTexture( family ) );
-        ComputerBorderRenderer.render( terminalWrapper.getX() - MARGIN, terminalWrapper.getY() - MARGIN,
-            getZOffset(), terminalWrapper.getWidth() + MARGIN * 2, terminalWrapper.getHeight() + MARGIN * 2 );
-    }
-
-    @Override
-    public boolean mouseDragged( double x, double y, int button, double deltaX, double deltaY )
-    {
-        return (getFocused() != null && getFocused().mouseDragged( x, y, button, deltaX, deltaY )) || super.mouseDragged( x, y, button, deltaX, deltaY );
-    }
-
-    @Override
-    public boolean mouseReleased( double mouseX, double mouseY, int button )
-    {
-        return (getFocused() != null && getFocused().mouseReleased( mouseX, mouseY, button )) || super.mouseReleased( x, y, button );
-    }
-
-    @Override
-    public boolean keyPressed( int key, int scancode, int modifiers )
-    {
-        // Forward the tab key to the terminal, rather than moving between controls.
-        if( key == GLFW.GLFW_KEY_TAB && getFocused() != null && getFocused() == terminalWrapper )
-        {
-            return getFocused().keyPressed( key, scancode, modifiers );
-        }
-
-        return super.keyPressed( key, scancode, modifiers );
-    }
-
-    @Override
-    public void removed()
-    {
-        super.removed();
-        children.remove( terminal );
-        terminal = null;
-        client.keyboard.setRepeatEvents( false );
-    }
-
-    @Override
-    public void tick()
-    {
-        super.tick();
-        terminal.update();
+        ComputerBorderRenderer.render(
+            getTexture( family ), terminal.x, terminal.y, getZOffset(),
+            RenderTypes.FULL_BRIGHT_LIGHTMAP, terminal.getWidth(), terminal.getHeight() );
+        ComputerSidebar.renderBackground( stack, x, y + sidebarYOffset );
     }
 }

src/main/java/dan200/computercraft/client/gui/GuiDiskDrive.java

@@ -9,6 +9,7 @@ package dan200.computercraft.client.gui;
 import com.mojang.blaze3d.systems.RenderSystem;
 import dan200.computercraft.shared.peripheral.diskdrive.ContainerDiskDrive;
 import net.minecraft.client.gui.screen.ingame.HandledScreen;
+import net.minecraft.client.render.GameRenderer;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.entity.player.PlayerInventory;
 import net.minecraft.text.Text;
@@ -36,9 +37,9 @@ public class GuiDiskDrive extends HandledScreen<ContainerDiskDrive>
     @Override
     protected void drawBackground( @Nonnull MatrixStack transform, float partialTicks, int mouseX, int mouseY )
     {
-        RenderSystem.color4f( 1.0F, 1.0F, 1.0F, 1.0F );
-        client.getTextureManager()
-            .bindTexture( BACKGROUND );
+        RenderSystem.setShader( GameRenderer::getPositionTexShader );
+        RenderSystem.setShaderColor( 1.0F, 1.0F, 1.0F, 1.0F );
+        RenderSystem.setShaderTexture( 0, BACKGROUND );
         drawTexture( transform, x, y, 0, 0, backgroundWidth, backgroundHeight );
     }
 }

src/main/java/dan200/computercraft/client/gui/GuiPrinter.java

@@ -25,14 +25,6 @@ public class GuiPrinter extends HandledScreen<ContainerPrinter>
         super( container, player, title );
     }
 
-    /*@Override
-    protected void drawGuiContainerForegroundLayer( int mouseX, int mouseY )
-    {
-        String title = getTitle().getFormattedText();
-        font.drawString( title, (xSize - font.getStringWidth( title )) / 2.0f, 6, 0x404040 );
-        font.drawString( I18n.format( "container.inventory" ), 8, ySize - 96 + 2, 0x404040 );
-    }*/
-
     @Override
     public void render( @Nonnull MatrixStack stack, int mouseX, int mouseY, float partialTicks )
     {
@@ -44,9 +36,8 @@ public class GuiPrinter extends HandledScreen<ContainerPrinter>
     @Override
     protected void drawBackground( @Nonnull MatrixStack transform, float partialTicks, int mouseX, int mouseY )
     {
-        RenderSystem.color4f( 1.0F, 1.0F, 1.0F, 1.0F );
-        client.getTextureManager()
-            .bindTexture( BACKGROUND );
+        RenderSystem.setShaderColor( 1.0F, 1.0F, 1.0F, 1.0F );
+        RenderSystem.setShaderTexture( 0, BACKGROUND );
         drawTexture( transform, x, y, 0, 0, backgroundWidth, backgroundHeight );
 
         if( getScreenHandler().isPrinting() )

src/main/java/dan200/computercraft/client/gui/GuiPrintout.java

@@ -22,6 +22,7 @@ import org.lwjgl.glfw.GLFW;
 import javax.annotation.Nonnull;
 
 import static dan200.computercraft.client.render.PrintoutRenderer.*;
+import static dan200.computercraft.client.render.RenderTypes.FULL_BRIGHT_LIGHTMAP;
 
 public class GuiPrintout extends HandledScreen<ContainerHeldItem>
 {
@@ -108,7 +109,7 @@ public class GuiPrintout extends HandledScreen<ContainerHeldItem>
     protected void drawBackground( @Nonnull MatrixStack transform, float partialTicks, int mouseX, int mouseY )
     {
         // Draw the printout
-        RenderSystem.color4f( 1.0f, 1.0f, 1.0f, 1.0f );
+        RenderSystem.setShaderColor( 1.0f, 1.0f, 1.0f, 1.0f );
         RenderSystem.enableDepthTest();
 
         VertexConsumerProvider.Immediate renderer = MinecraftClient.getInstance()
@@ -116,8 +117,8 @@ public class GuiPrintout extends HandledScreen<ContainerHeldItem>
             .getEntityVertexConsumers();
         Matrix4f matrix = transform.peek()
             .getModel();
-        drawBorder( matrix, renderer, x, y, getZOffset(), page, pages, book );
-        drawText( matrix, renderer, x + X_TEXT_MARGIN, y + Y_TEXT_MARGIN, ItemPrintout.LINES_PER_PAGE * page, text, colours );
+        drawBorder( matrix, renderer, x, y, getZOffset(), page, pages, book, FULL_BRIGHT_LIGHTMAP );
+        drawText( matrix, renderer, x + X_TEXT_MARGIN, y + Y_TEXT_MARGIN, ItemPrintout.LINES_PER_PAGE * page, FULL_BRIGHT_LIGHTMAP, text, colours );
         renderer.draw();
     }
 

src/main/java/dan200/computercraft/client/gui/GuiTurtle.java

@@ -8,6 +8,9 @@ package dan200.computercraft.client.gui;
 
 import com.mojang.blaze3d.systems.RenderSystem;
 import dan200.computercraft.ComputerCraft;
+import dan200.computercraft.client.gui.widgets.ComputerSidebar;
+import dan200.computercraft.client.gui.widgets.WidgetTerminal;
+import dan200.computercraft.client.render.ComputerBorderRenderer;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.turtle.inventory.ContainerTurtle;
 import net.minecraft.client.util.math.MatrixStack;
@@ -17,40 +20,46 @@ import net.minecraft.util.Identifier;
 
 import javax.annotation.Nonnull;
 
-public class GuiTurtle extends GuiComputer<ContainerTurtle>
+import static dan200.computercraft.shared.turtle.inventory.ContainerTurtle.BORDER;
+
+public class GuiTurtle extends ComputerScreenBase<ContainerTurtle>
 {
     private static final Identifier BACKGROUND_NORMAL = new Identifier( "computercraft", "textures/gui/turtle_normal.png" );
     private static final Identifier BACKGROUND_ADVANCED = new Identifier( "computercraft", "textures/gui/turtle_advanced.png" );
-    private final ContainerTurtle container;
+
+    private static final int TEX_WIDTH = 254;
+    private static final int TEX_HEIGHT = 217;
+
+    private final ComputerFamily family;
 
     public GuiTurtle( ContainerTurtle container, PlayerInventory player, Text title )
     {
-        super( container, player, title, ComputerCraft.turtleTermWidth, ComputerCraft.turtleTermHeight );
+        super( container, player, title, BORDER );
+
+        family = container.getFamily();
+        backgroundWidth = TEX_WIDTH + ComputerSidebar.WIDTH;
+        backgroundHeight = TEX_HEIGHT;
 
-        this.container = container;
     }
 
     @Override
-    protected void init()
+    protected WidgetTerminal createTerminal()
     {
-        initTerminal( 8, 0, 80 );
+        return new WidgetTerminal(
+            computer, x + BORDER + ComputerSidebar.WIDTH, y + BORDER,
+            ComputerCraft.turtleTermWidth, ComputerCraft.turtleTermHeight
+        );
     }
 
     @Override
     public void drawBackground( @Nonnull MatrixStack transform, float partialTicks, int mouseX, int mouseY )
     {
-        // Draw term
-        Identifier texture = family == ComputerFamily.ADVANCED ? BACKGROUND_ADVANCED : BACKGROUND_NORMAL;
-        terminal.draw( terminalWrapper.getX(), terminalWrapper.getY() );
-
-        // Draw border/inventory
-        RenderSystem.color4f( 1.0F, 1.0F, 1.0F, 1.0F );
-        client.getTextureManager()
-            .bindTexture( texture );
-        drawTexture( transform, x, y, 0, 0, backgroundWidth, backgroundHeight );
+        boolean advanced = family == ComputerFamily.ADVANCED;
+        RenderSystem.setShaderTexture( 0, advanced ? BACKGROUND_ADVANCED : BACKGROUND_NORMAL );
+        drawTexture( transform, x + ComputerSidebar.WIDTH, y, 0, 0, TEX_WIDTH, TEX_HEIGHT );
 
         // Draw selection slot
-        int slot = container.getSelectedSlot();
+        int slot = getScreenHandler().getSelectedSlot();
         if( slot >= 0 )
         {
             int slotX = slot % 4;
@@ -61,5 +70,8 @@ public class GuiTurtle extends GuiComputer<ContainerTurtle>
                 24,
                 24 );
         }
+
+        RenderSystem.setShaderTexture( 0, advanced ? ComputerBorderRenderer.BACKGROUND_ADVANCED : ComputerBorderRenderer.BACKGROUND_NORMAL );
+        ComputerSidebar.renderBackground( transform, x, y + sidebarYOffset );
     }
 }

src/main/java/dan200/computercraft/client/gui/NoTermComputerScreen.java

@@ -0,0 +1,118 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.client.gui;
+
+import dan200.computercraft.ComputerCraft;
+import dan200.computercraft.client.gui.widgets.WidgetTerminal;
+import dan200.computercraft.shared.computer.core.ClientComputer;
+import dan200.computercraft.shared.computer.inventory.ContainerComputerBase;
+import net.minecraft.client.font.TextRenderer;
+import net.minecraft.client.gui.screen.Screen;
+import net.minecraft.client.gui.screen.ingame.ScreenHandlerProvider;
+import net.minecraft.client.util.math.MatrixStack;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.text.OrderedText;
+import net.minecraft.text.Text;
+import net.minecraft.text.TranslatableText;
+import org.lwjgl.glfw.GLFW;
+
+import javax.annotation.Nonnull;
+import java.util.List;
+
+public class NoTermComputerScreen<T extends ContainerComputerBase> extends Screen implements ScreenHandlerProvider<T>
+{
+    private final T menu;
+    private WidgetTerminal terminal;
+
+    public NoTermComputerScreen( T menu, PlayerInventory player, Text title )
+    {
+        super( title );
+        this.menu = menu;
+    }
+
+    @Nonnull
+    @Override
+    public T getScreenHandler()
+    {
+        return menu;
+    }
+
+    @Override
+    protected void init()
+    {
+        this.passEvents = true;
+        client.mouse.lockCursor();
+        client.currentScreen = this;
+        super.init();
+        client.keyboard.setRepeatEvents( true );
+
+        terminal = addSelectableChild( new WidgetTerminal( (ClientComputer) menu.getComputer(), 0, 0, ComputerCraft.pocketTermWidth, ComputerCraft.pocketTermHeight ) );
+        terminal.visible = false;
+        terminal.active = false;
+        setFocused( terminal );
+    }
+
+    @Override
+    public final void removed()
+    {
+        super.removed();
+        client.keyboard.setRepeatEvents( false );
+    }
+
+    @Override
+    public final void tick()
+    {
+        super.tick();
+        terminal.update();
+    }
+
+    @Override
+    public boolean mouseScrolled( double pMouseX, double pMouseY, double pDelta )
+    {
+        client.player.getInventory().scrollInHotbar( pDelta );
+        return super.mouseScrolled( pMouseX, pMouseY, pDelta );
+    }
+
+    @Override
+    public void onClose()
+    {
+        client.player.closeHandledScreen();
+        super.onClose();
+    }
+
+    @Override
+    public boolean isPauseScreen()
+    {
+        return false;
+    }
+
+    @Override
+    public final boolean keyPressed( int key, int scancode, int modifiers )
+    {
+        // Forward the tab key to the terminal, rather than moving between controls.
+        if( key == GLFW.GLFW_KEY_TAB && getFocused() != null && getFocused() == terminal )
+        {
+            return getFocused().keyPressed( key, scancode, modifiers );
+        }
+
+        return super.keyPressed( key, scancode, modifiers );
+    }
+
+    @Override
+    public void render( MatrixStack transform, int mouseX, int mouseY, float partialTicks )
+    {
+        super.render( transform, mouseX, mouseY, partialTicks );
+
+        TextRenderer font = client.textRenderer;
+        List<OrderedText> lines = font.wrapLines( new TranslatableText( "gui.computercraft.pocket_computer_overlay" ), (int) (width * 0.8) );
+        float y = 10.0f;
+        for( OrderedText line : lines )
+        {
+            font.drawWithShadow( transform, line, (float) ((width / 2) - (client.textRenderer.getWidth( line ) / 2)), y, 0xFFFFFF );
+            y += 9.0f;
+        }
+    }
+}

src/main/java/dan200/computercraft/client/gui/OptionScreen.java

@@ -0,0 +1,128 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.client.gui;
+
+import com.mojang.blaze3d.systems.RenderSystem;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.font.MultilineText;
+import net.minecraft.client.gui.screen.Screen;
+import net.minecraft.client.gui.widget.ButtonWidget;
+import net.minecraft.client.gui.widget.ClickableWidget;
+import net.minecraft.client.util.math.MatrixStack;
+import net.minecraft.text.Text;
+import net.minecraft.util.Identifier;
+
+import javax.annotation.Nonnull;
+import java.util.List;
+
+public final class OptionScreen extends Screen
+{
+    private static final Identifier BACKGROUND = new Identifier( "computercraft", "textures/gui/blank_screen.png" );
+
+    public static final int BUTTON_WIDTH = 100;
+    public static final int BUTTON_HEIGHT = 20;
+
+    private static final int PADDING = 16;
+    private static final int FONT_HEIGHT = 9;
+
+    private int x;
+    private int y;
+    private int innerWidth;
+    private int innerHeight;
+
+    private MultilineText messageRenderer;
+    private final Text message;
+    private final List<ClickableWidget> buttons;
+    private final Runnable exit;
+
+    private final Screen originalScreen;
+
+    private OptionScreen( Text title, Text message, List<ClickableWidget> buttons, Runnable exit, Screen originalScreen )
+    {
+        super( title );
+        this.message = message;
+        this.buttons = buttons;
+        this.exit = exit;
+        this.originalScreen = originalScreen;
+    }
+
+    public static void show( MinecraftClient client, Text title, Text message, List<ClickableWidget> buttons, Runnable exit )
+    {
+        client.setScreen( new OptionScreen( title, message, buttons, exit, unwrap( client.currentScreen ) ) );
+    }
+
+    public static Screen unwrap( Screen screen )
+    {
+        return screen instanceof OptionScreen ? ((OptionScreen) screen).getOriginalScreen() : screen;
+    }
+
+    @Override
+    public void init()
+    {
+        super.init();
+
+        int buttonWidth = BUTTON_WIDTH * buttons.size() + PADDING * (buttons.size() - 1);
+        int innerWidth = this.innerWidth = Math.max( 256, buttonWidth + PADDING * 2 );
+
+        messageRenderer = MultilineText.create( textRenderer, message, innerWidth - PADDING * 2 );
+
+        int textHeight = messageRenderer.count() * FONT_HEIGHT + PADDING * 2;
+        innerHeight = textHeight + (buttons.isEmpty() ? 0 : buttons.get( 0 ).getHeight()) + PADDING;
+
+        x = (width - innerWidth) / 2;
+        y = (height - innerHeight) / 2;
+
+        int x = (width - buttonWidth) / 2;
+        for( ClickableWidget button : buttons )
+        {
+            button.x = x;
+            button.y = y + textHeight;
+            addDrawableChild( button );
+
+            x += BUTTON_WIDTH + PADDING;
+        }
+    }
+
+    @Override
+    public void render( @Nonnull MatrixStack transform, int mouseX, int mouseY, float partialTicks )
+    {
+        renderBackground( transform );
+
+        // Render the actual texture.
+        RenderSystem.setShaderTexture( 0, BACKGROUND );
+        drawTexture( transform, x, y, 0, 0, innerWidth, PADDING );
+        drawTexture( transform,
+            x, y + PADDING, 0, PADDING, innerWidth, innerHeight - PADDING * 2,
+            innerWidth, PADDING
+        );
+        drawTexture( transform, x, y + innerHeight - PADDING, 0, 256 - PADDING, innerWidth, PADDING );
+
+        messageRenderer.draw( transform, x + PADDING, y + PADDING, FONT_HEIGHT, 0x404040 );
+        super.render( transform, mouseX, mouseY, partialTicks );
+    }
+
+    @Override
+    public void onClose()
+    {
+        exit.run();
+    }
+
+    public static ClickableWidget newButton( Text component, ButtonWidget.PressAction clicked )
+    {
+        return new ButtonWidget( 0, 0, BUTTON_WIDTH, BUTTON_HEIGHT, component, clicked );
+    }
+
+    public void disable()
+    {
+        for( ClickableWidget widget : buttons ) widget.active = false;
+    }
+
+    @Nonnull
+    public Screen getOriginalScreen()
+    {
+        return originalScreen;
+    }
+}

src/main/java/dan200/computercraft/client/gui/widgets/ComputerSidebar.java

@@ -0,0 +1,107 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.client.gui.widgets;
+
+import dan200.computercraft.ComputerCraft;
+import dan200.computercraft.client.render.ComputerBorderRenderer;
+import dan200.computercraft.shared.command.text.ChatHelpers;
+import dan200.computercraft.shared.computer.core.ClientComputer;
+import net.minecraft.client.gui.screen.Screen;
+import net.minecraft.client.gui.widget.ClickableWidget;
+import net.minecraft.client.util.math.MatrixStack;
+import net.minecraft.text.TranslatableText;
+import net.minecraft.util.Formatting;
+import net.minecraft.util.Identifier;
+
+import java.util.Arrays;
+import java.util.function.Consumer;
+
+/**
+ * Registers buttons to interact with a computer.
+ */
+public final class ComputerSidebar
+{
+    private static final Identifier TEXTURE = new Identifier( ComputerCraft.MOD_ID, "textures/gui/buttons.png" );
+
+    private static final int TEX_SIZE = 64;
+
+    private static final int ICON_WIDTH = 12;
+    private static final int ICON_HEIGHT = 12;
+    private static final int ICON_MARGIN = 2;
+
+    private static final int ICON_TEX_Y_DIFF = 14;
+
+    private static final int CORNERS_BORDER = 3;
+    private static final int FULL_BORDER = CORNERS_BORDER + ICON_MARGIN;
+
+    private static final int BUTTONS = 2;
+    private static final int HEIGHT = (ICON_HEIGHT + ICON_MARGIN * 2) * BUTTONS + CORNERS_BORDER * 2;
+    public static final int WIDTH = 17;
+
+    private ComputerSidebar()
+    {
+    }
+
+    public static void addButtons( Screen screen, ClientComputer computer, Consumer<ClickableWidget> add, int x, int y )
+    {
+        x += CORNERS_BORDER + 1;
+        y += CORNERS_BORDER + ICON_MARGIN;
+
+        add.accept( new DynamicImageButton(
+            screen, x, y, ICON_WIDTH, ICON_HEIGHT, () -> computer.isOn() ? 15 : 1, 1, ICON_TEX_Y_DIFF,
+            TEXTURE, TEX_SIZE, TEX_SIZE, b -> toggleComputer( computer ),
+            () -> computer.isOn() ? Arrays.asList(
+                new TranslatableText( "gui.computercraft.tooltip.turn_off" ),
+                ChatHelpers.coloured( new TranslatableText( "gui.computercraft.tooltip.turn_off.key" ), Formatting.GRAY )
+            ) : Arrays.asList(
+                new TranslatableText( "gui.computercraft.tooltip.turn_on" ),
+                ChatHelpers.coloured( new TranslatableText( "gui.computercraft.tooltip.turn_off.key" ), Formatting.GRAY )
+            )
+        ) );
+
+        y += ICON_HEIGHT + ICON_MARGIN * 2;
+
+        add.accept( new DynamicImageButton(
+            screen, x, y, ICON_WIDTH, ICON_HEIGHT, 29, 1, ICON_TEX_Y_DIFF,
+            TEXTURE, TEX_SIZE, TEX_SIZE, b -> computer.queueEvent( "terminate" ),
+            Arrays.asList(
+                new TranslatableText( "gui.computercraft.tooltip.terminate" ),
+                ChatHelpers.coloured( new TranslatableText( "gui.computercraft.tooltip.terminate.key" ), Formatting.GRAY )
+            )
+        ) );
+    }
+
+    public static void renderBackground( MatrixStack transform, int x, int y )
+    {
+        Screen.drawTexture( transform,
+            x, y, 0, 102, WIDTH, FULL_BORDER,
+            ComputerBorderRenderer.TEX_SIZE, ComputerBorderRenderer.TEX_SIZE
+        );
+
+        Screen.drawTexture( transform,
+            x, y + FULL_BORDER, WIDTH, HEIGHT - FULL_BORDER * 2,
+            0, 107, WIDTH, 4,
+            ComputerBorderRenderer.TEX_SIZE, ComputerBorderRenderer.TEX_SIZE
+        );
+
+        Screen.drawTexture( transform,
+            x, y + HEIGHT - FULL_BORDER, 0, 111, WIDTH, FULL_BORDER,
+            ComputerBorderRenderer.TEX_SIZE, ComputerBorderRenderer.TEX_SIZE
+        );
+    }
+
+    private static void toggleComputer( ClientComputer computer )
+    {
+        if( computer.isOn() )
+        {
+            computer.shutdown();
+        }
+        else
+        {
+            computer.turnOn();
+        }
+    }
+}

src/main/java/dan200/computercraft/client/gui/widgets/DynamicImageButton.java

@@ -0,0 +1,100 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.client.gui.widgets;
+
+import com.mojang.blaze3d.systems.RenderSystem;
+import net.minecraft.client.gui.screen.Screen;
+import net.minecraft.client.gui.widget.ButtonWidget;
+import net.minecraft.client.util.math.MatrixStack;
+import net.minecraft.text.LiteralText;
+import net.minecraft.text.Text;
+import net.minecraft.util.Identifier;
+
+import javax.annotation.Nonnull;
+import java.util.List;
+import java.util.function.IntSupplier;
+import java.util.function.Supplier;
+
+/**
+ * Version of {@link net.minecraft.client.gui.widget.TexturedButtonWidget} which allows changing some properties
+ * dynamically.
+ */
+public class DynamicImageButton extends ButtonWidget
+{
+    private final Screen screen;
+    private final Identifier texture;
+    private final IntSupplier xTexStart;
+    private final int yTexStart;
+    private final int yDiffTex;
+    private final int textureWidth;
+    private final int textureHeight;
+    private final Supplier<List<Text>> tooltip;
+
+    public DynamicImageButton(
+        Screen screen, int x, int y, int width, int height, int xTexStart, int yTexStart, int yDiffTex,
+        Identifier texture, int textureWidth, int textureHeight,
+        PressAction onPress, List<Text> tooltip
+    )
+    {
+        this(
+            screen, x, y, width, height, () -> xTexStart, yTexStart, yDiffTex,
+            texture, textureWidth, textureHeight,
+            onPress, () -> tooltip
+        );
+    }
+
+
+    public DynamicImageButton(
+        Screen screen, int x, int y, int width, int height, IntSupplier xTexStart, int yTexStart, int yDiffTex,
+        Identifier texture, int textureWidth, int textureHeight,
+        PressAction onPress, Supplier<List<Text>> tooltip
+    )
+    {
+        super( x, y, width, height, LiteralText.EMPTY, onPress );
+        this.screen = screen;
+        this.textureWidth = textureWidth;
+        this.textureHeight = textureHeight;
+        this.xTexStart = xTexStart;
+        this.yTexStart = yTexStart;
+        this.yDiffTex = yDiffTex;
+        this.texture = texture;
+        this.tooltip = tooltip;
+    }
+
+    @Override
+    public void renderButton( @Nonnull MatrixStack stack, int mouseX, int mouseY, float partialTicks )
+    {
+        RenderSystem.setShaderTexture( 0, texture );
+        RenderSystem.disableDepthTest();
+
+        int yTex = yTexStart;
+        if( isHovered() ) yTex += yDiffTex;
+
+        drawTexture( stack, x, y, xTexStart.getAsInt(), yTex, width, height, textureWidth, textureHeight );
+        RenderSystem.enableDepthTest();
+
+        if( isHovered() ) renderToolTip( stack, mouseX, mouseY );
+    }
+
+    @Nonnull
+    @Override
+    public Text getMessage()
+    {
+        List<Text> tooltip = this.tooltip.get();
+        return tooltip.isEmpty() ? LiteralText.EMPTY : tooltip.get( 0 );
+    }
+
+    // @Override
+    public void renderToolTip( @Nonnull MatrixStack stack, int mouseX, int mouseY )
+    {
+        List<Text> tooltip = this.tooltip.get();
+
+        if( !tooltip.isEmpty() )
+        {
+            screen.renderTooltip( stack, tooltip, mouseX, mouseY );
+        }
+    }
+}

src/main/java/dan200/computercraft/client/gui/widgets/WidgetTerminal.java

@@ -9,66 +9,84 @@ package dan200.computercraft.client.gui.widgets;
 import dan200.computercraft.client.gui.FixedWidthFontRenderer;
 import dan200.computercraft.core.terminal.Terminal;
 import dan200.computercraft.shared.computer.core.ClientComputer;
-import dan200.computercraft.shared.computer.core.IComputer;
 import net.minecraft.SharedConstants;
 import net.minecraft.client.MinecraftClient;
-import net.minecraft.client.gui.Element;
+import net.minecraft.client.gui.screen.narration.NarrationMessageBuilder;
+import net.minecraft.client.gui.widget.ClickableWidget;
+import net.minecraft.client.util.math.MatrixStack;
+import net.minecraft.text.LiteralText;
+import net.minecraft.util.math.Matrix4f;
 import org.lwjgl.glfw.GLFW;
 
+import javax.annotation.Nonnull;
 import java.util.BitSet;
-import java.util.function.Supplier;
 
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_HEIGHT;
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_WIDTH;
+import static dan200.computercraft.client.render.ComputerBorderRenderer.MARGIN;
 
-public class WidgetTerminal implements Element
+public class WidgetTerminal extends ClickableWidget
 {
     private static final float TERMINATE_TIME = 0.5f;
 
-    private final MinecraftClient client;
-    private final Supplier<ClientComputer> computer;
-    private final int termWidth;
-    private final int termHeight;
-    private final int leftMargin;
-    private final int rightMargin;
-    private final int topMargin;
-    private final int bottomMargin;
-    private final BitSet keysDown = new BitSet( 256 );
-    private boolean focused;
+    private final ClientComputer computer;
+
+    // The positions of the actual terminal
+    private final int innerX;
+    private final int innerY;
+    private final int innerWidth;
+    private final int innerHeight;
+
     private float terminateTimer = -1;
     private float rebootTimer = -1;
     private float shutdownTimer = -1;
+
     private int lastMouseButton = -1;
     private int lastMouseX = -1;
     private int lastMouseY = -1;
 
-    public WidgetTerminal( MinecraftClient client, Supplier<ClientComputer> computer, int termWidth, int termHeight, int leftMargin, int rightMargin,
-                           int topMargin, int bottomMargin )
+    private final BitSet keysDown = new BitSet( 256 );
+
+    public WidgetTerminal( @Nonnull ClientComputer computer, int x, int y, int termWidth, int termHeight )
     {
-        this.client = client;
+        super( x, y, termWidth * FONT_WIDTH + MARGIN * 2, termHeight * FONT_HEIGHT + MARGIN * 2, LiteralText.EMPTY );
+
         this.computer = computer;
-        this.termWidth = termWidth;
-        this.termHeight = termHeight;
-        this.leftMargin = leftMargin;
-        this.rightMargin = rightMargin;
-        this.topMargin = topMargin;
-        this.bottomMargin = bottomMargin;
+
+        innerX = x + MARGIN;
+        innerY = y + MARGIN;
+        innerWidth = termWidth * FONT_WIDTH;
+        innerHeight = termHeight * FONT_HEIGHT;
+    }
+
+    @Override
+    public boolean charTyped( char ch, int modifiers )
+    {
+        if( ch >= 32 && ch <= 126 || ch >= 160 && ch <= 255 ) // printable chars in byte range
+        {
+            // Queue the "char" event
+            queueEvent( "char", Character.toString( ch ) );
+        }
+
+        return true;
+    }
+
+    private boolean inTermRegion( double mouseX, double mouseY )
+    {
+        return active && visible && mouseX >= innerX && mouseY >= innerY && mouseX < innerX + innerWidth && mouseY < innerY + innerHeight;
     }
 
     @Override
     public boolean mouseClicked( double mouseX, double mouseY, int button )
     {
-        ClientComputer computer = this.computer.get();
-        if( computer == null || !computer.isColour() || button < 0 || button > 2 )
-        {
-            return false;
-        }
+        if( !inTermRegion( mouseX, mouseY ) ) return false;
+        if( !computer.isColour() || button < 0 || button > 2 ) return false;
 
         Terminal term = computer.getTerminal();
         if( term != null )
         {
-            int charX = (int) (mouseX / FONT_WIDTH);
-            int charY = (int) (mouseY / FONT_HEIGHT);
+            int charX = (int) ((mouseX - innerX) / FONT_WIDTH);
+            int charY = (int) ((mouseY - innerY) / FONT_HEIGHT);
             charX = Math.min( Math.max( charX, 0 ), term.getWidth() - 1 );
             charY = Math.min( Math.max( charY, 0 ), term.getHeight() - 1 );
 
@@ -85,17 +103,14 @@ public class WidgetTerminal implements Element
     @Override
     public boolean mouseReleased( double mouseX, double mouseY, int button )
     {
-        ClientComputer computer = this.computer.get();
-        if( computer == null || !computer.isColour() || button < 0 || button > 2 )
-        {
-            return false;
-        }
+        if( !inTermRegion( mouseX, mouseY ) ) return false;
+        if( !computer.isColour() || button < 0 || button > 2 ) return false;
 
         Terminal term = computer.getTerminal();
         if( term != null )
         {
-            int charX = (int) (mouseX / FONT_WIDTH);
-            int charY = (int) (mouseY / FONT_HEIGHT);
+            int charX = (int) ((mouseX - innerX) / FONT_WIDTH);
+            int charY = (int) ((mouseY - innerY) / FONT_HEIGHT);
             charX = Math.min( Math.max( charX, 0 ), term.getWidth() - 1 );
             charY = Math.min( Math.max( charY, 0 ), term.getHeight() - 1 );
 
@@ -115,17 +130,14 @@ public class WidgetTerminal implements Element
     @Override
     public boolean mouseDragged( double mouseX, double mouseY, int button, double v2, double v3 )
     {
-        ClientComputer computer = this.computer.get();
-        if( computer == null || !computer.isColour() || button < 0 || button > 2 )
-        {
-            return false;
-        }
+        if( !inTermRegion( mouseX, mouseY ) ) return false;
+        if( !computer.isColour() || button < 0 || button > 2 ) return false;
 
         Terminal term = computer.getTerminal();
         if( term != null )
         {
-            int charX = (int) (mouseX / FONT_WIDTH);
-            int charY = (int) (mouseY / FONT_HEIGHT);
+            int charX = (int) ((mouseX - innerX) / FONT_WIDTH);
+            int charY = (int) ((mouseY - innerY) / FONT_HEIGHT);
             charX = Math.min( Math.max( charX, 0 ), term.getWidth() - 1 );
             charY = Math.min( Math.max( charY, 0 ), term.getHeight() - 1 );
 
@@ -143,17 +155,14 @@ public class WidgetTerminal implements Element
     @Override
     public boolean mouseScrolled( double mouseX, double mouseY, double delta )
     {
-        ClientComputer computer = this.computer.get();
-        if( computer == null || !computer.isColour() || delta == 0 )
-        {
-            return false;
-        }
+        if( !inTermRegion( mouseX, mouseY ) ) return false;
+        if( !computer.isColour() || delta == 0 ) return false;
 
         Terminal term = computer.getTerminal();
         if( term != null )
         {
-            int charX = (int) (mouseX / FONT_WIDTH);
-            int charY = (int) (mouseY / FONT_HEIGHT);
+            int charX = (int) ((mouseX - innerX) / FONT_WIDTH);
+            int charY = (int) ((mouseY - innerY) / FONT_HEIGHT);
             charX = Math.min( Math.max( charX, 0 ), term.getWidth() - 1 );
             charY = Math.min( Math.max( charY, 0 ), term.getHeight() - 1 );
 
@@ -198,7 +207,7 @@ public class WidgetTerminal implements Element
 
                 case GLFW.GLFW_KEY_V:
                     // Ctrl+V for paste
-                    String clipboard = client.keyboard.getClipboard();
+                    String clipboard = MinecraftClient.getInstance().keyboard.getClipboard();
                     if( clipboard != null )
                     {
                         // Clip to the first occurrence of \r or \n
@@ -239,11 +248,7 @@ public class WidgetTerminal implements Element
             // Queue the "key" event and add to the down set
             boolean repeat = keysDown.get( key );
             keysDown.set( key );
-            IComputer computer = this.computer.get();
-            if( computer != null )
-            {
-                computer.keyDown( key, repeat );
-            }
+            computer.keyDown( key, repeat );
         }
 
         return true;
@@ -256,11 +261,7 @@ public class WidgetTerminal implements Element
         if( key >= 0 && keysDown.get( key ) )
         {
             keysDown.set( key, false );
-            IComputer computer = this.computer.get();
-            if( computer != null )
-            {
-                computer.keyUp( key );
-            }
+            computer.keyUp( key );
         }
 
         switch( key )
@@ -284,47 +285,26 @@ public class WidgetTerminal implements Element
     }
 
     @Override
-    public boolean charTyped( char ch, int modifiers )
+    public void onFocusedChanged( boolean focused )
     {
-        if( ch >= 32 && ch <= 126 || ch >= 160 && ch <= 255 ) // printable chars in byte range
-        {
-            // Queue the "char" event
-            queueEvent( "char", Character.toString( ch ) );
-        }
-
-        return true;
-    }
-
-    @Override
-    public boolean changeFocus( boolean reversed )
-    {
-        if( focused )
+        if( !focused )
         {
             // When blurring, we should make all keys go up
             for( int key = 0; key < keysDown.size(); key++ )
             {
-                if( keysDown.get( key ) )
-                {
-                    queueEvent( "key_up", key );
-                }
+                if( keysDown.get( key ) ) computer.keyUp( key );
             }
             keysDown.clear();
 
             // When blurring, we should make the last mouse button go up
             if( lastMouseButton > 0 )
             {
-                IComputer computer = this.computer.get();
-                if( computer != null )
-                {
-                    computer.mouseUp( lastMouseButton + 1, lastMouseX + 1, lastMouseY + 1 );
-                }
+                computer.mouseUp( lastMouseButton + 1, lastMouseX + 1, lastMouseY + 1 );
                 lastMouseButton = -1;
             }
 
             shutdownTimer = terminateTimer = rebootTimer = -1;
         }
-        focused = !focused;
-        return true;
     }
 
     @Override
@@ -335,11 +315,7 @@ public class WidgetTerminal implements Element
 
     private void queueEvent( String event, Object... args )
     {
-        ClientComputer computer = this.computer.get();
-        if( computer != null )
-        {
-            computer.queueEvent( event, args );
-        }
+        computer.queueEvent( event, args );
     }
 
     public void update()
@@ -351,50 +327,53 @@ public class WidgetTerminal implements Element
 
         if( shutdownTimer >= 0 && shutdownTimer < TERMINATE_TIME && (shutdownTimer += 0.05f) > TERMINATE_TIME )
         {
-            ClientComputer computer = this.computer.get();
-            if( computer != null )
-            {
-                computer.shutdown();
-            }
+            computer.shutdown();
         }
 
         if( rebootTimer >= 0 && rebootTimer < TERMINATE_TIME && (rebootTimer += 0.05f) > TERMINATE_TIME )
         {
-            ClientComputer computer = this.computer.get();
-            if( computer != null )
-            {
-                computer.reboot();
-            }
+            computer.reboot();
         }
     }
 
     private void queueEvent( String event )
     {
-        ClientComputer computer = this.computer.get();
+        ClientComputer computer = this.computer;
         if( computer != null )
         {
             computer.queueEvent( event );
         }
     }
 
-    public void draw( int originX, int originY )
+    @Override
+    public void render( @Nonnull MatrixStack transform, int mouseX, int mouseY, float partialTicks )
     {
-        synchronized( computer )
+        if( !visible ) return;
+        Matrix4f matrix = transform.peek().getModel();
+        Terminal terminal = computer.getTerminal();
+        if( terminal != null )
         {
-            // Draw the screen contents
-            ClientComputer computer = this.computer.get();
-            Terminal terminal = computer != null ? computer.getTerminal() : null;
-            if( terminal != null )
-            {
-                FixedWidthFontRenderer.drawTerminal( originX, originY, terminal, !computer.isColour(), topMargin, bottomMargin, leftMargin,
-                    rightMargin );
-            }
-            else
-            {
-                FixedWidthFontRenderer.drawEmptyTerminal( originX - leftMargin,
-                    originY - rightMargin, termWidth * FONT_WIDTH + leftMargin + rightMargin,
-                    termHeight * FONT_HEIGHT + topMargin + bottomMargin );
-            }
+            FixedWidthFontRenderer.drawTerminal( matrix, innerX, innerY, terminal, !computer.isColour(), MARGIN, MARGIN, MARGIN, MARGIN );
+        }
+        else
+        {
+            FixedWidthFontRenderer.drawEmptyTerminal( matrix, x, y, width, height );
         }
     }
+
+    @Override
+    public void appendNarrations( NarrationMessageBuilder builder )
+    {
+
+    }
+
+    public static int getWidth( int termWidth )
+    {
+        return termWidth * FONT_WIDTH + MARGIN * 2;
+    }
+
+    public static int getHeight( int termHeight )
+    {
+        return termHeight * FONT_HEIGHT + MARGIN * 2;
+    }
 }

src/main/java/dan200/computercraft/client/gui/widgets/WidgetWrapper.java

@@ -1,106 +0,0 @@
-/*
- * This file is part of ComputerCraft - http://www.computercraft.info
- * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
- * Send enquiries to dratcliffe@gmail.com
- */
-
-package dan200.computercraft.client.gui.widgets;
-
-import net.minecraft.client.gui.Element;
-
-public class WidgetWrapper implements Element
-{
-    private final Element listener;
-    private final int x;
-    private final int y;
-    private final int width;
-    private final int height;
-
-    public WidgetWrapper( Element listener, int x, int y, int width, int height )
-    {
-        this.listener = listener;
-        this.x = x;
-        this.y = y;
-        this.width = width;
-        this.height = height;
-    }
-
-    @Override
-    public boolean mouseClicked( double x, double y, int button )
-    {
-        double dx = x - this.x, dy = y - this.y;
-        return dx >= 0 && dx < width && dy >= 0 && dy < height && listener.mouseClicked( dx, dy, button );
-    }
-
-    @Override
-    public boolean mouseReleased( double x, double y, int button )
-    {
-        double dx = x - this.x, dy = y - this.y;
-        return dx >= 0 && dx < width && dy >= 0 && dy < height && listener.mouseReleased( dx, dy, button );
-    }
-
-    @Override
-    public boolean mouseDragged( double x, double y, int button, double deltaX, double deltaY )
-    {
-        double dx = x - this.x, dy = y - this.y;
-        return dx >= 0 && dx < width && dy >= 0 && dy < height && listener.mouseDragged( dx, dy, button, deltaX, deltaY );
-    }
-
-    @Override
-    public boolean mouseScrolled( double x, double y, double delta )
-    {
-        double dx = x - this.x, dy = y - this.y;
-        return dx >= 0 && dx < width && dy >= 0 && dy < height && listener.mouseScrolled( dx, dy, delta );
-    }
-
-    @Override
-    public boolean keyPressed( int key, int scancode, int modifiers )
-    {
-        return listener.keyPressed( key, scancode, modifiers );
-    }
-
-    @Override
-    public boolean keyReleased( int key, int scancode, int modifiers )
-    {
-        return listener.keyReleased( key, scancode, modifiers );
-    }
-
-    @Override
-    public boolean charTyped( char character, int modifiers )
-    {
-        return listener.charTyped( character, modifiers );
-    }
-
-    @Override
-    public boolean changeFocus( boolean b )
-    {
-        return listener.changeFocus( b );
-    }
-
-    @Override
-    public boolean isMouseOver( double x, double y )
-    {
-        double dx = x - this.x, dy = y - this.y;
-        return dx >= 0 && dx < width && dy >= 0 && dy < height;
-    }
-
-    public int getX()
-    {
-        return x;
-    }
-
-    public int getY()
-    {
-        return y;
-    }
-
-    public int getWidth()
-    {
-        return width;
-    }
-
-    public int getHeight()
-    {
-        return height;
-    }
-}

src/main/java/dan200/computercraft/client/proxy/ComputerCraftProxyClient.java

@@ -19,12 +19,11 @@ import dan200.computercraft.shared.ComputerCraftRegistry;
 import dan200.computercraft.shared.common.ContainerHeldItem;
 import dan200.computercraft.shared.common.IColouredItem;
 import dan200.computercraft.shared.common.TileGeneric;
-import dan200.computercraft.shared.computer.inventory.ContainerComputer;
+import dan200.computercraft.shared.computer.inventory.ContainerComputerBase;
 import dan200.computercraft.shared.computer.inventory.ContainerViewComputer;
 import dan200.computercraft.shared.peripheral.diskdrive.ContainerDiskDrive;
 import dan200.computercraft.shared.peripheral.monitor.ClientMonitor;
 import dan200.computercraft.shared.peripheral.printer.ContainerPrinter;
-import dan200.computercraft.shared.pocket.inventory.ContainerPocketComputer;
 import dan200.computercraft.shared.pocket.items.ItemPocketComputer;
 import dan200.computercraft.shared.turtle.inventory.ContainerTurtle;
 import dan200.computercraft.shared.util.Config;
@@ -35,12 +34,12 @@ import net.fabricmc.fabric.api.blockrenderlayer.v1.BlockRenderLayerMap;
 import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientBlockEntityEvents;
 import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents;
 import net.fabricmc.fabric.api.client.model.ModelLoadingRegistry;
-import net.fabricmc.fabric.api.client.rendereregistry.v1.BlockEntityRendererRegistry;
-import net.fabricmc.fabric.api.client.rendereregistry.v1.EntityRendererRegistry;
+import net.fabricmc.fabric.api.client.rendering.v1.BlockEntityRendererRegistry;
+import net.fabricmc.fabric.api.client.rendering.v1.EntityRendererRegistry;
 import net.fabricmc.fabric.api.client.screenhandler.v1.ScreenRegistry;
 import net.fabricmc.fabric.api.event.client.ClientSpriteRegistryCallback;
-import net.fabricmc.fabric.mixin.object.builder.ModelPredicateProviderRegistrySpecificAccessor;
-import net.minecraft.client.item.ModelPredicateProvider;
+import net.fabricmc.fabric.api.object.builder.v1.client.model.FabricModelPredicateProviderRegistry;
+import net.minecraft.client.item.UnclampedModelPredicateProvider;
 import net.minecraft.client.render.RenderLayer;
 import net.minecraft.item.Item;
 import net.minecraft.screen.PlayerScreenHandler;
@@ -76,33 +75,32 @@ public final class ComputerCraftProxyClient implements ClientModInitializer
         // While turtles themselves are not transparent, their upgrades may be.
         BlockRenderLayerMap.INSTANCE.putBlock( ComputerCraftRegistry.ModBlocks.TURTLE_NORMAL, RenderLayer.getTranslucent() );
         BlockRenderLayerMap.INSTANCE.putBlock( ComputerCraftRegistry.ModBlocks.TURTLE_ADVANCED, RenderLayer.getTranslucent() );
-
         // Monitors' textures have transparent fronts and so count as cutouts.
         BlockRenderLayerMap.INSTANCE.putBlock( ComputerCraftRegistry.ModBlocks.MONITOR_NORMAL, RenderLayer.getCutout() );
         BlockRenderLayerMap.INSTANCE.putBlock( ComputerCraftRegistry.ModBlocks.MONITOR_ADVANCED, RenderLayer.getCutout() );
 
         // Setup TESRs
-        BlockEntityRendererRegistry.INSTANCE.register( ComputerCraftRegistry.ModTiles.MONITOR_NORMAL, TileEntityMonitorRenderer::new );
-        BlockEntityRendererRegistry.INSTANCE.register( ComputerCraftRegistry.ModTiles.MONITOR_ADVANCED, TileEntityMonitorRenderer::new );
-        BlockEntityRendererRegistry.INSTANCE.register( ComputerCraftRegistry.ModTiles.TURTLE_NORMAL, TileEntityTurtleRenderer::new );
-        BlockEntityRendererRegistry.INSTANCE.register( ComputerCraftRegistry.ModTiles.TURTLE_ADVANCED, TileEntityTurtleRenderer::new );
+        BlockEntityRendererRegistry.register( ComputerCraftRegistry.ModTiles.MONITOR_NORMAL, TileEntityMonitorRenderer::new );
+        BlockEntityRendererRegistry.register( ComputerCraftRegistry.ModTiles.MONITOR_ADVANCED, TileEntityMonitorRenderer::new );
+        BlockEntityRendererRegistry.register( ComputerCraftRegistry.ModTiles.TURTLE_NORMAL, TileEntityTurtleRenderer::new );
+        BlockEntityRendererRegistry.register( ComputerCraftRegistry.ModTiles.TURTLE_ADVANCED, TileEntityTurtleRenderer::new );
 
         ClientSpriteRegistryCallback.event( PlayerScreenHandler.BLOCK_ATLAS_TEXTURE )
             .register( ClientRegistry::onTextureStitchEvent );
-        ModelLoadingRegistry.INSTANCE.registerAppender( ClientRegistry::onModelBakeEvent );
+        ModelLoadingRegistry.INSTANCE.registerModelProvider( ClientRegistry::onModelBakeEvent );
         ModelLoadingRegistry.INSTANCE.registerResourceProvider( loader -> ( name, context ) -> TurtleModelLoader.INSTANCE.accepts( name ) ?
             TurtleModelLoader.INSTANCE.loadModel(
                 name ) : null );
 
-        EntityRendererRegistry.INSTANCE.register( ComputerCraftRegistry.ModEntities.TURTLE_PLAYER, TurtlePlayerRenderer::new );
+        EntityRendererRegistry.register( ComputerCraftRegistry.ModEntities.TURTLE_PLAYER, TurtlePlayerRenderer::new );
 
         registerItemProperty( "state",
-            ( stack, world, player ) -> ItemPocketComputer.getState( stack )
+            ( stack, world, player, integer ) -> ItemPocketComputer.getState( stack )
                 .ordinal(),
             () -> ComputerCraftRegistry.ModItems.POCKET_COMPUTER_NORMAL,
             () -> ComputerCraftRegistry.ModItems.POCKET_COMPUTER_ADVANCED );
         registerItemProperty( "state",
-            ( stack, world, player ) -> IColouredItem.getColourBasic( stack ) != -1 ? 1 : 0,
+            ( stack, world, player, integer ) -> IColouredItem.getColourBasic( stack ) != -1 ? 1 : 0,
             () -> ComputerCraftRegistry.ModItems.POCKET_COMPUTER_NORMAL,
             () -> ComputerCraftRegistry.ModItems.POCKET_COMPUTER_ADVANCED );
         ClientRegistry.onItemColours();
@@ -113,9 +111,11 @@ public final class ComputerCraftProxyClient implements ClientModInitializer
     // My IDE doesn't think so, but we do actually need these generics.
     private static void registerContainers()
     {
-        ScreenRegistry.<ContainerComputer, GuiComputer<ContainerComputer>>register( ComputerCraftRegistry.ModContainers.COMPUTER, GuiComputer::create );
-        ScreenRegistry.<ContainerPocketComputer, GuiComputer<ContainerPocketComputer>>register( ComputerCraftRegistry.ModContainers.POCKET_COMPUTER,
+        ScreenRegistry.<ContainerComputerBase, GuiComputer<ContainerComputerBase>>register( ComputerCraftRegistry.ModContainers.COMPUTER, GuiComputer::create );
+        ScreenRegistry.<ContainerComputerBase, GuiComputer<ContainerComputerBase>>register( ComputerCraftRegistry.ModContainers.POCKET_COMPUTER,
             GuiComputer::createPocket );
+        ScreenRegistry.<ContainerComputerBase, NoTermComputerScreen<ContainerComputerBase>>register( ComputerCraftRegistry.ModContainers.POCKET_COMPUTER_NO_TERM,
+            NoTermComputerScreen::new );
         ScreenRegistry.<ContainerTurtle, GuiTurtle>register( ComputerCraftRegistry.ModContainers.TURTLE, GuiTurtle::new );
 
         ScreenRegistry.<ContainerPrinter, GuiPrinter>register( ComputerCraftRegistry.ModContainers.PRINTER, GuiPrinter::new );
@@ -127,12 +127,12 @@ public final class ComputerCraftProxyClient implements ClientModInitializer
     }
 
     @SafeVarargs
-    private static void registerItemProperty( String name, ModelPredicateProvider getter, Supplier<? extends Item>... items )
+    private static void registerItemProperty( String name, UnclampedModelPredicateProvider getter, Supplier<? extends Item>... items )
     {
         Identifier id = new Identifier( ComputerCraft.MOD_ID, name );
         for( Supplier<? extends Item> item : items )
         {
-            ModelPredicateProviderRegistrySpecificAccessor.callRegister( item.get(), id, getter );
+            FabricModelPredicateProviderRegistry.register( item.get(), id, getter );
         }
     }
 }

src/main/java/dan200/computercraft/client/render/CableHighlightRenderer.java

@@ -18,9 +18,8 @@ import net.minecraft.client.render.Camera;
 import net.minecraft.client.render.VertexConsumer;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.entity.Entity;
-import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.math.Matrix4f;
-import net.minecraft.util.math.Vec3d;
+import net.minecraft.util.hit.HitResult;
+import net.minecraft.util.math.*;
 import net.minecraft.util.shape.VoxelShape;
 
 @Environment( EnvType.CLIENT )
@@ -42,24 +41,40 @@ public final class CableHighlightRenderer
             return false;
         }
 
+        HitResult hitResult = MinecraftClient.getInstance().crosshairTarget;
+
+        Vec3d hitPos = hitResult != null ? hitResult.getPos() : new Vec3d( d, e, f );
+
         VoxelShape shape = WorldUtil.isVecInside( CableShapes.getModemShape( state ),
-            new Vec3d( d, e, f ).subtract( pos.getX(),
+            hitPos.subtract( pos.getX(),
                 pos.getY(),
                 pos.getZ() ) ) ? CableShapes.getModemShape( state ) : CableShapes.getCableShape(
             state );
 
         Vec3d cameraPos = info.getPos();
+
         double xOffset = pos.getX() - cameraPos.getX();
         double yOffset = pos.getY() - cameraPos.getY();
         double zOffset = pos.getZ() - cameraPos.getZ();
         Matrix4f matrix4f = stack.peek()
             .getModel();
+        Matrix3f normal = stack.peek().getNormal();
         shape.forEachEdge( ( x1, y1, z1, x2, y2, z2 ) -> {
+            float xDelta = (float) (x2 - x1);
+            float yDelta = (float) (y2 - y1);
+            float zDelta = (float) (z2 - z1);
+            float len = MathHelper.sqrt( xDelta * xDelta + yDelta * yDelta + zDelta * zDelta );
+            xDelta = xDelta / len;
+            yDelta = yDelta / len;
+            zDelta = zDelta / len;
+
             consumer.vertex( matrix4f, (float) (x1 + xOffset), (float) (y1 + yOffset), (float) (z1 + zOffset) )
                 .color( 0, 0, 0, 0.4f )
+                .normal( normal, xDelta, yDelta, zDelta )
                 .next();
             consumer.vertex( matrix4f, (float) (x2 + xOffset), (float) (y2 + yOffset), (float) (z2 + zOffset) )
                 .color( 0, 0, 0, 0.4f )
+                .normal( normal, xDelta, yDelta, zDelta )
                 .next();
         } );
 

src/main/java/dan200/computercraft/client/render/ComputerBorderRenderer.java

@@ -5,16 +5,14 @@
  */
 package dan200.computercraft.client.render;
 
-import com.mojang.blaze3d.systems.RenderSystem;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
-import net.minecraft.client.render.BufferBuilder;
+import net.minecraft.client.render.RenderLayer;
 import net.minecraft.client.render.Tessellator;
 import net.minecraft.client.render.VertexConsumer;
-import net.minecraft.client.render.VertexFormats;
+import net.minecraft.client.render.VertexConsumerProvider;
 import net.minecraft.util.Identifier;
 import net.minecraft.util.math.Matrix4f;
-import org.lwjgl.opengl.GL11;
 
 import javax.annotation.Nonnull;
 
@@ -42,7 +40,8 @@ public class ComputerBorderRenderer
     private static final int LIGHT_CORNER_Y = 80;
 
     public static final int LIGHT_HEIGHT = 8;
-    private static final float TEX_SCALE = 1 / 256.0f;
+    public static final int TEX_SIZE = 256;
+    private static final float TEX_SCALE = 1 / (float) TEX_SIZE;
 
     static
     {
@@ -54,11 +53,14 @@ public class ComputerBorderRenderer
     private final int z;
     private final float r, g, b;
 
-    public ComputerBorderRenderer( Matrix4f transform, VertexConsumer builder, int z, float r, float g, float b )
+    private final int light;
+
+    public ComputerBorderRenderer( Matrix4f transform, VertexConsumer builder, int z, int light, float r, float g, float b )
     {
         this.transform = transform;
         this.builder = builder;
         this.z = z;
+        this.light = light;
         this.r = r;
         this.g = g;
         this.b = b;
@@ -80,31 +82,17 @@ public class ComputerBorderRenderer
         }
     }
 
-    public static void render( int x, int y, int z, int width, int height )
+    public static void render( Identifier location, int x, int y, int z, int light, int width, int height )
     {
-        Tessellator tessellator = Tessellator.getInstance();
-        BufferBuilder buffer = tessellator.getBuffer();
-        buffer.begin( GL11.GL_QUADS, VertexFormats.POSITION_COLOR_TEXTURE );
-
-        render( IDENTITY, buffer, x, y, z, width, height );
-
-        RenderSystem.enableAlphaTest();
-        tessellator.draw();
+        VertexConsumerProvider.Immediate source = VertexConsumerProvider.immediate( Tessellator.getInstance().getBuffer() );
+        render( IDENTITY, source.getBuffer( RenderLayer.getText( location ) ), x, y, z, light, width, height, false, 1, 1, 1 );
+        source.draw();
     }
 
-    public static void render( Matrix4f transform, VertexConsumer buffer, int x, int y, int z, int width, int height )
-    {
-        render( transform, buffer, x, y, z, width, height, 1, 1, 1 );
-    }
 
-    public static void render( Matrix4f transform, VertexConsumer buffer, int x, int y, int z, int width, int height, float r, float g, float b )
+    public static void render( Matrix4f transform, VertexConsumer buffer, int x, int y, int z, int light, int width, int height, boolean withLight, float r, float g, float b )
     {
-        render( transform, buffer, x, y, z, width, height, false, r, g, b );
-    }
-
-    public static void render( Matrix4f transform, VertexConsumer buffer, int x, int y, int z, int width, int height, boolean withLight, float r, float g, float b )
-    {
-        new ComputerBorderRenderer( transform, buffer, z, r, g, b ).doRender( x, y, width, height, withLight );
+        new ComputerBorderRenderer( transform, buffer, z, light, r, g, b ).doRender( x, y, width, height, withLight );
     }
 
     public void doRender( int x, int y, int width, int height, boolean withLight )
@@ -157,18 +145,22 @@ public class ComputerBorderRenderer
         builder.vertex( transform, x, y + height, z )
             .color( r, g, b, 1.0f )
             .texture( u * TEX_SCALE, (v + textureHeight) * TEX_SCALE )
+            .light( light )
             .next();
         builder.vertex( transform, x + width, y + height, z )
             .color( r, g, b, 1.0f )
             .texture( (u + textureWidth) * TEX_SCALE, (v + textureHeight) * TEX_SCALE )
+            .light( light )
             .next();
         builder.vertex( transform, x + width, y, z )
             .color( r, g, b, 1.0f )
             .texture( (u + textureWidth) * TEX_SCALE, v * TEX_SCALE )
+            .light( light )
             .next();
         builder.vertex( transform, x, y, z )
             .color( r, g, b, 1.0f )
             .texture( u * TEX_SCALE, v * TEX_SCALE )
+            .light( light )
             .next();
     }
 }

src/main/java/dan200/computercraft/client/render/ItemMapLikeRenderer.java

@@ -13,12 +13,12 @@ import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.render.VertexConsumerProvider;
 import net.minecraft.client.render.item.HeldItemRenderer;
 import net.minecraft.client.util.math.MatrixStack;
-import net.minecraft.client.util.math.Vector3f;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.Arm;
 import net.minecraft.util.Hand;
 import net.minecraft.util.math.MathHelper;
+import net.minecraft.util.math.Vec3f;
 
 @Environment( EnvType.CLIENT )
 public abstract class ItemMapLikeRenderer
@@ -75,21 +75,21 @@ public abstract class ItemMapLikeRenderer
         HeldItemRendererAccess access = (HeldItemRendererAccess) renderer;
         float pitchAngle = access.callGetMapAngle( pitch );
         transform.translate( 0, 0.04F + equipProgress * -1.2f + pitchAngle * -0.5f, -0.72f );
-        transform.multiply( Vector3f.POSITIVE_X.getDegreesQuaternion( pitchAngle * -85.0f ) );
+        transform.multiply( Vec3f.POSITIVE_X.getDegreesQuaternion( pitchAngle * -85.0f ) );
         if( !minecraft.player.isInvisible() )
         {
             transform.push();
-            transform.multiply( Vector3f.POSITIVE_Y.getDegreesQuaternion( 90.0F ) );
+            transform.multiply( Vec3f.POSITIVE_Y.getDegreesQuaternion( 90.0F ) );
             access.callRenderArm( transform, render, combinedLight, Arm.RIGHT );
             access.callRenderArm( transform, render, combinedLight, Arm.LEFT );
             transform.pop();
         }
 
         float rX = MathHelper.sin( swingRt * (float) Math.PI );
-        transform.multiply( Vector3f.POSITIVE_X.getDegreesQuaternion( rX * 20.0F ) );
+        transform.multiply( Vec3f.POSITIVE_X.getDegreesQuaternion( rX * 20.0F ) );
         transform.scale( 2.0F, 2.0F, 2.0F );
 
-        renderItem( transform, render, stack );
+        renderItem( transform, render, stack, combinedLight );
     }
 
     /**
@@ -114,7 +114,7 @@ public abstract class ItemMapLikeRenderer
         if( !minecraft.player.isInvisible() )
         {
             transform.push();
-            transform.multiply( Vector3f.POSITIVE_Z.getDegreesQuaternion( offset * 10f ) );
+            transform.multiply( Vec3f.POSITIVE_Z.getDegreesQuaternion( offset * 10f ) );
             ((HeldItemRendererAccess) minecraft.getHeldItemRenderer())
                 .callRenderArmHoldingItem( transform, render, combinedLight, equipProgress, swingProgress, side );
             transform.pop();
@@ -130,10 +130,10 @@ public abstract class ItemMapLikeRenderer
         float f4 = 0.4f * MathHelper.sin( f1 * ((float) Math.PI * 2f) );
         float f5 = -0.3f * MathHelper.sin( swingProgress * (float) Math.PI );
         transform.translate( offset * f3, f4 - 0.3f * f2, f5 );
-        transform.multiply( Vector3f.POSITIVE_X.getDegreesQuaternion( f2 * -45f ) );
-        transform.multiply( Vector3f.POSITIVE_Y.getDegreesQuaternion( offset * f2 * -30f ) );
+        transform.multiply( Vec3f.POSITIVE_X.getDegreesQuaternion( f2 * -45f ) );
+        transform.multiply( Vec3f.POSITIVE_Y.getDegreesQuaternion( offset * f2 * -30f ) );
 
-        renderItem( transform, render, stack );
+        renderItem( transform, render, stack, combinedLight );
 
         transform.pop();
     }
@@ -144,6 +144,7 @@ public abstract class ItemMapLikeRenderer
      * @param transform The matrix transformation stack
      * @param render    The buffer to render to
      * @param stack     The stack to render
+     * @param light     TODO rebase
      */
-    protected abstract void renderItem( MatrixStack transform, VertexConsumerProvider render, ItemStack stack );
+    protected abstract void renderItem( MatrixStack transform, VertexConsumerProvider render, ItemStack stack, int light );
 }

src/main/java/dan200/computercraft/client/render/ItemPocketRenderer.java

@@ -15,15 +15,12 @@ import dan200.computercraft.shared.computer.core.ComputerFamily;
 import dan200.computercraft.shared.pocket.items.ItemPocketComputer;
 import dan200.computercraft.shared.util.Colour;
 import net.minecraft.client.MinecraftClient;
-import net.minecraft.client.render.BufferBuilder;
-import net.minecraft.client.render.Tessellator;
-import net.minecraft.client.render.VertexConsumerProvider;
-import net.minecraft.client.render.VertexFormats;
+import net.minecraft.client.render.*;
 import net.minecraft.client.util.math.MatrixStack;
-import net.minecraft.client.util.math.Vector3f;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.Identifier;
 import net.minecraft.util.math.Matrix4f;
-import org.lwjgl.opengl.GL11;
+import net.minecraft.util.math.Vec3f;
 
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_HEIGHT;
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_WIDTH;
@@ -41,7 +38,7 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
     }
 
     @Override
-    protected void renderItem( MatrixStack transform, VertexConsumerProvider render, ItemStack stack )
+    protected void renderItem( MatrixStack transform, VertexConsumerProvider render, ItemStack stack, int light )
     {
         ClientComputer computer = ItemPocketComputer.createClientComputer( stack );
         Terminal terminal = computer == null ? null : computer.getTerminal();
@@ -64,8 +61,8 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
         // Setup various transformations. Note that these are partially adapted from the corresponding method
         // in ItemRenderer
         transform.push();
-        transform.multiply( Vector3f.POSITIVE_Y.getDegreesQuaternion( 180f ) );
-        transform.multiply( Vector3f.POSITIVE_Z.getDegreesQuaternion( 180f ) );
+        transform.multiply( Vec3f.POSITIVE_Y.getDegreesQuaternion( 180f ) );
+        transform.multiply( Vec3f.POSITIVE_Z.getDegreesQuaternion( 180f ) );
         transform.scale( 0.5f, 0.5f, 0.5f );
 
         float scale = 0.75f / Math.max( width + BORDER * 2, height + BORDER * 2 + LIGHT_HEIGHT );
@@ -79,7 +76,7 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
 
         Matrix4f matrix = transform.peek()
             .getModel();
-        renderFrame( matrix, family, frameColour, width, height );
+        renderFrame( matrix, render, family, frameColour, light, width, height );
 
         // Render the light
         int lightColour = ItemPocketComputer.getLightState( stack );
@@ -91,7 +88,12 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
 
         if( computer != null && terminal != null )
         {
-            FixedWidthFontRenderer.drawTerminal( matrix, MARGIN, MARGIN, terminal, !computer.isColour(), MARGIN, MARGIN, MARGIN, MARGIN );
+            FixedWidthFontRenderer.drawTerminal(
+                matrix, render.getBuffer( RenderTypes.TERMINAL_WITHOUT_DEPTH ),
+                MARGIN, MARGIN, terminal, !computer.isColour(), MARGIN, MARGIN, MARGIN, MARGIN
+            );
+            FixedWidthFontRenderer.drawBlocker( transform.peek().getModel(), render, 0, 0, width, height );
+
         }
         else
         {
@@ -101,24 +103,20 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
         transform.pop();
     }
 
-    private static void renderFrame( Matrix4f transform, ComputerFamily family, int colour, int width, int height )
+    private static void renderFrame( Matrix4f transform, VertexConsumerProvider render, ComputerFamily family, int colour, int light, int width, int height )
     {
         RenderSystem.enableBlend();
         MinecraftClient.getInstance()
             .getTextureManager()
             .bindTexture( colour != -1 ? ComputerBorderRenderer.BACKGROUND_COLOUR : ComputerBorderRenderer.getTexture( family ) );
 
+        Identifier texture = colour != -1 ? ComputerBorderRenderer.BACKGROUND_COLOUR : ComputerBorderRenderer.getTexture( family );
+
         float r = ((colour >>> 16) & 0xFF) / 255.0f;
         float g = ((colour >>> 8) & 0xFF) / 255.0f;
         float b = (colour & 0xFF) / 255.0f;
 
-        Tessellator tessellator = Tessellator.getInstance();
-        BufferBuilder buffer = tessellator.getBuffer();
-        buffer.begin( GL11.GL_QUADS, VertexFormats.POSITION_COLOR_TEXTURE );
-
-        ComputerBorderRenderer.render( transform, buffer, 0, 0, 0, width, height, true, r, g, b );
-
-        tessellator.draw();
+        ComputerBorderRenderer.render( transform, render.getBuffer( RenderLayer.getText( texture ) ), 0, 0, 0, light, width, height, true, r, g, b );
     }
 
     private static void renderLight( Matrix4f transform, int colour, int width, int height )
@@ -131,7 +129,7 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
 
         Tessellator tessellator = Tessellator.getInstance();
         BufferBuilder buffer = tessellator.getBuffer();
-        buffer.begin( GL11.GL_QUADS, VertexFormats.POSITION_COLOR );
+        buffer.begin( VertexFormat.DrawMode.QUADS, VertexFormats.POSITION_COLOR );
         buffer.vertex( transform, width - LIGHT_HEIGHT * 2, height + LIGHT_HEIGHT + BORDER / 2.0f, 0 )
             .color( r, g, b, 1.0f )
             .next();

src/main/java/dan200/computercraft/client/render/ItemPrintoutRenderer.java

@@ -9,9 +9,9 @@ package dan200.computercraft.client.render;
 import dan200.computercraft.shared.media.items.ItemPrintout;
 import net.minecraft.client.render.VertexConsumerProvider;
 import net.minecraft.client.util.math.MatrixStack;
-import net.minecraft.client.util.math.Vector3f;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.math.Matrix4f;
+import net.minecraft.util.math.Vec3f;
 
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_HEIGHT;
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_WIDTH;
@@ -31,16 +31,16 @@ public final class ItemPrintoutRenderer extends ItemMapLikeRenderer
     }
 
     @Override
-    protected void renderItem( MatrixStack transform, VertexConsumerProvider render, ItemStack stack )
+    protected void renderItem( MatrixStack transform, VertexConsumerProvider render, ItemStack stack, int light )
     {
-        transform.multiply( Vector3f.POSITIVE_X.getDegreesQuaternion( 180f ) );
+        transform.multiply( Vec3f.POSITIVE_X.getDegreesQuaternion( 180f ) );
         transform.scale( 0.42f, 0.42f, -0.42f );
         transform.translate( -0.5f, -0.48f, 0.0f );
 
-        drawPrintout( transform, render, stack );
+        drawPrintout( transform, render, stack, light );
     }
 
-    private static void drawPrintout( MatrixStack transform, VertexConsumerProvider render, ItemStack stack )
+    private static void drawPrintout( MatrixStack transform, VertexConsumerProvider render, ItemStack stack, int light )
     {
         int pages = ItemPrintout.getPageCount( stack );
         boolean book = ((ItemPrintout) stack.getItem()).getType() == ItemPrintout.Type.BOOK;
@@ -72,11 +72,11 @@ public final class ItemPrintoutRenderer extends ItemMapLikeRenderer
 
         Matrix4f matrix = transform.peek()
             .getModel();
-        drawBorder( matrix, render, 0, 0, -0.01f, 0, pages, book );
-        drawText( matrix, render, X_TEXT_MARGIN, Y_TEXT_MARGIN, 0, ItemPrintout.getText( stack ), ItemPrintout.getColours( stack ) );
+        drawBorder( matrix, render, 0, 0, -0.01f, 0, pages, book, light );
+        drawText( matrix, render, X_TEXT_MARGIN, Y_TEXT_MARGIN, 0, light, ItemPrintout.getText( stack ), ItemPrintout.getColours( stack ) );
     }
 
-    public boolean renderInFrame( MatrixStack matrixStack, VertexConsumerProvider consumerProvider, ItemStack stack )
+    public boolean renderInFrame( MatrixStack matrixStack, VertexConsumerProvider consumerProvider, ItemStack stack, int light )
     {
         if( !(stack.getItem() instanceof ItemPrintout) )
         {
@@ -85,11 +85,11 @@ public final class ItemPrintoutRenderer extends ItemMapLikeRenderer
 
         // Move a little bit forward to ensure we're not clipping with the frame
         matrixStack.translate( 0.0f, 0.0f, -0.001f );
-        matrixStack.multiply( Vector3f.POSITIVE_Z.getDegreesQuaternion( 180f ) );
+        matrixStack.multiply( Vec3f.POSITIVE_Z.getDegreesQuaternion( 180f ) );
         matrixStack.scale( 0.95f, 0.95f, -0.95f );
         matrixStack.translate( -0.5f, -0.5f, 0.0f );
 
-        drawPrintout( matrixStack, consumerProvider, stack );
+        drawPrintout( matrixStack, consumerProvider, stack, light );
 
         return true;
     }

src/main/java/dan200/computercraft/client/render/ModelTransformer.java

@@ -5,15 +5,14 @@
  */
 package dan200.computercraft.client.render;
 
-import dan200.computercraft.fabric.mixin.BakedQuadAccess;
 import net.fabricmc.api.EnvType;
 import net.fabricmc.api.Environment;
 import net.minecraft.client.render.VertexFormat;
 import net.minecraft.client.render.VertexFormatElement;
 import net.minecraft.client.render.VertexFormats;
 import net.minecraft.client.render.model.BakedQuad;
-import net.minecraft.client.util.math.Vector4f;
 import net.minecraft.util.math.Matrix4f;
+import net.minecraft.util.math.Vector4f;
 
 import java.util.List;
 
@@ -58,7 +57,7 @@ public final class ModelTransformer
     private static BakedQuad doTransformQuad( VertexFormat format, BakedQuad quad, Matrix4f transform )
     {
         int[] vertexData = quad.getVertexData().clone();
-        BakedQuad copy = new BakedQuad( vertexData, -1, quad.getFace(), ((BakedQuadAccess) quad).getSprite(), true );
+        BakedQuad copy = new BakedQuad( vertexData, -1, quad.getFace(), quad.getSprite(), true );
 
         int offsetBytes = 0;
         for( int v = 0; v < 4; ++v )
@@ -66,7 +65,7 @@ public final class ModelTransformer
             for( VertexFormatElement element : format.getElements() ) // For each vertex element
             {
                 int start = offsetBytes / Integer.BYTES;
-                if( element.getType() == VertexFormatElement.Type.POSITION && element.getFormat() == VertexFormatElement.Format.FLOAT ) // When we find a position element
+                if( element.getType() == VertexFormatElement.Type.POSITION && element.getDataType() == VertexFormatElement.DataType.FLOAT ) // When we find a position element
                 {
                     Vector4f pos = new Vector4f( Float.intBitsToFloat( vertexData[start] ),
                         Float.intBitsToFloat( vertexData[start + 1] ),
@@ -81,7 +80,7 @@ public final class ModelTransformer
                     vertexData[start + 1] = Float.floatToRawIntBits( pos.getY() );
                     vertexData[start + 2] = Float.floatToRawIntBits( pos.getZ() );
                 }
-                offsetBytes += element.getSize();
+                offsetBytes += element.getByteLength();
             }
         }
         return copy;

src/main/java/dan200/computercraft/client/render/MonitorHighlightRenderer.java

@@ -15,14 +15,10 @@ import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.render.VertexConsumer;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.entity.Entity;
-import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.math.Direction;
-import net.minecraft.util.math.Matrix4f;
-import net.minecraft.util.math.Vec3d;
+import net.minecraft.util.math.*;
 import net.minecraft.world.World;
 
 import java.util.EnumSet;
-
 import static net.minecraft.util.math.Direction.*;
 
 /**
@@ -36,9 +32,7 @@ public final class MonitorHighlightRenderer
     {
     }
 
-    public static boolean drawHighlight(
-        MatrixStack matrixStack, VertexConsumer vertexConsumer, Entity entity, double d, double e, double f, BlockPos pos, BlockState blockState
-    )
+    public static boolean drawHighlight( MatrixStack matrixStack, VertexConsumer vertexConsumer, Entity entity, double d, double e, double f, BlockPos pos, BlockState blockState )
     {
         // Preserve normal behaviour when crouching.
         if( entity.isInSneakingPose() )
@@ -49,13 +43,11 @@ public final class MonitorHighlightRenderer
         World world = entity.getEntityWorld();
 
         BlockEntity tile = world.getBlockEntity( pos );
-        if( !(tile instanceof TileMonitor) )
+        if( !(tile instanceof TileMonitor monitor) )
         {
             return false;
         }
 
-        TileMonitor monitor = (TileMonitor) tile;
-
         // Determine which sides are part of the external faces of the monitor, and so which need to be rendered.
         EnumSet<Direction> faces = EnumSet.allOf( Direction.class );
         Direction front = monitor.getFront();
@@ -87,53 +79,54 @@ public final class MonitorHighlightRenderer
         // I wish I could think of a better way to do this
         Matrix4f transform = matrixStack.peek()
             .getModel();
+        Matrix3f normal = matrixStack.peek().getNormal();
         if( faces.contains( NORTH ) || faces.contains( WEST ) )
         {
-            line( vertexConsumer, transform, 0, 0, 0, UP );
+            line( vertexConsumer, transform, normal, 0, 0, 0, UP );
         }
         if( faces.contains( SOUTH ) || faces.contains( WEST ) )
         {
-            line( vertexConsumer, transform, 0, 0, 1, UP );
+            line( vertexConsumer, transform, normal, 0, 0, 1, UP );
         }
         if( faces.contains( NORTH ) || faces.contains( EAST ) )
         {
-            line( vertexConsumer, transform, 1, 0, 0, UP );
+            line( vertexConsumer, transform, normal, 1, 0, 0, UP );
         }
         if( faces.contains( SOUTH ) || faces.contains( EAST ) )
         {
-            line( vertexConsumer, transform, 1, 0, 1, UP );
+            line( vertexConsumer, transform, normal, 1, 0, 1, UP );
         }
         if( faces.contains( NORTH ) || faces.contains( DOWN ) )
         {
-            line( vertexConsumer, transform, 0, 0, 0, EAST );
+            line( vertexConsumer, transform, normal, 0, 0, 0, EAST );
         }
         if( faces.contains( SOUTH ) || faces.contains( DOWN ) )
         {
-            line( vertexConsumer, transform, 0, 0, 1, EAST );
+            line( vertexConsumer, transform, normal, 0, 0, 1, EAST );
         }
         if( faces.contains( NORTH ) || faces.contains( UP ) )
         {
-            line( vertexConsumer, transform, 0, 1, 0, EAST );
+            line( vertexConsumer, transform, normal, 0, 1, 0, EAST );
         }
         if( faces.contains( SOUTH ) || faces.contains( UP ) )
         {
-            line( vertexConsumer, transform, 0, 1, 1, EAST );
+            line( vertexConsumer, transform, normal, 0, 1, 1, EAST );
         }
         if( faces.contains( WEST ) || faces.contains( DOWN ) )
         {
-            line( vertexConsumer, transform, 0, 0, 0, SOUTH );
+            line( vertexConsumer, transform, normal, 0, 0, 0, SOUTH );
         }
         if( faces.contains( EAST ) || faces.contains( DOWN ) )
         {
-            line( vertexConsumer, transform, 1, 0, 0, SOUTH );
+            line( vertexConsumer, transform, normal, 1, 0, 0, SOUTH );
         }
         if( faces.contains( WEST ) || faces.contains( UP ) )
         {
-            line( vertexConsumer, transform, 0, 1, 0, SOUTH );
+            line( vertexConsumer, transform, normal, 0, 1, 0, SOUTH );
         }
         if( faces.contains( EAST ) || faces.contains( UP ) )
         {
-            line( vertexConsumer, transform, 1, 1, 0, SOUTH );
+            line( vertexConsumer, transform, normal, 1, 1, 0, SOUTH );
         }
 
         matrixStack.pop();
@@ -141,13 +134,15 @@ public final class MonitorHighlightRenderer
         return true;
     }
 
-    private static void line( VertexConsumer buffer, Matrix4f transform, float x, float y, float z, Direction direction )
+    private static void line( VertexConsumer buffer, Matrix4f transform, Matrix3f normal, float x, float y, float z, Direction direction )
     {
         buffer.vertex( transform, x, y, z )
             .color( 0, 0, 0, 0.4f )
+            .normal( normal, direction.getOffsetX(), direction.getOffsetY(), direction.getOffsetZ() )
             .next();
         buffer.vertex( transform, x + direction.getOffsetX(), y + direction.getOffsetY(), z + direction.getOffsetZ() )
             .color( 0, 0, 0, 0.4f )
+            .normal( normal, direction.getOffsetX(), direction.getOffsetY(), direction.getOffsetZ() )
             .next();
     }
 }

src/main/java/dan200/computercraft/client/render/MonitorTextureBufferShader.java

@@ -5,180 +5,107 @@
  */
 package dan200.computercraft.client.render;
 
-import com.google.common.base.Strings;
-import com.mojang.blaze3d.platform.GlStateManager;
-import com.mojang.blaze3d.systems.RenderSystem;
-import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.client.gui.FixedWidthFontRenderer;
 import dan200.computercraft.shared.util.Palette;
-import net.minecraft.client.texture.TextureUtil;
-import net.minecraft.util.math.Matrix4f;
-import org.lwjgl.BufferUtils;
+import net.minecraft.client.gl.GlUniform;
+import net.minecraft.client.render.Shader;
+import net.minecraft.client.render.VertexFormat;
+import net.minecraft.resource.ResourceFactory;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 import org.lwjgl.opengl.GL13;
-import org.lwjgl.opengl.GL20;
 
-import java.io.InputStream;
+import javax.annotation.Nullable;
+import java.io.IOException;
 import java.nio.FloatBuffer;
 
-class MonitorTextureBufferShader
+public class MonitorTextureBufferShader extends Shader
 {
     static final int TEXTURE_INDEX = GL13.GL_TEXTURE3;
 
-    private static final FloatBuffer MATRIX_BUFFER = BufferUtils.createFloatBuffer( 16 );
-    private static final FloatBuffer PALETTE_BUFFER = BufferUtils.createFloatBuffer( 16 * 3 );
+    private static final Logger LOGGER = LogManager.getLogger();
 
-    private static int uniformMv;
+    private final GlUniform palette;
+    private final GlUniform width;
+    private final GlUniform height;
 
-    private static int uniformFont;
-    private static int uniformWidth;
-    private static int uniformHeight;
-    private static int uniformTbo;
-    private static int uniformPalette;
-
-    private static boolean initialised;
-    private static boolean ok;
-    private static int program;
-
-    static void setupUniform( Matrix4f transform, int width, int height, Palette palette, boolean greyscale )
+    public MonitorTextureBufferShader( ResourceFactory factory, String name, VertexFormat format ) throws IOException
     {
-        MATRIX_BUFFER.rewind();
-        transform.writeToBuffer( MATRIX_BUFFER );
-        MATRIX_BUFFER.rewind();
-        RenderSystem.glUniformMatrix4( uniformMv, false, MATRIX_BUFFER );
+        super( factory, name, format );
 
-        RenderSystem.glUniform1i( uniformWidth, width );
-        RenderSystem.glUniform1i( uniformHeight, height );
+        width = getUniformChecked( "Width" );
+        height = getUniformChecked( "Height" );
+        palette = new GlUniform( "Palette", GlUniform.field_32044 /* UT_FLOAT3 */, 16 * 3, this );
+        updateUniformLocation( palette );
 
-        PALETTE_BUFFER.rewind();
+        GlUniform tbo = getUniformChecked( "Tbo" );
+        if( tbo != null ) tbo.set( TEXTURE_INDEX - GL13.GL_TEXTURE0 );
+    }
+
+    void setupUniform( int width, int height, Palette palette, boolean greyscale )
+    {
+        if( this.width != null ) this.width.set( width );
+        if( this.height != null ) this.height.set( height );
+        setupPalette( palette, greyscale );
+    }
+
+    private void setupPalette( Palette palette, boolean greyscale )
+    {
+        if( this.palette == null ) return;
+
+        FloatBuffer paletteBuffer = this.palette.getFloatData();
+        paletteBuffer.rewind();
         for( int i = 0; i < 16; i++ )
         {
             double[] colour = palette.getColour( i );
             if( greyscale )
             {
                 float f = FixedWidthFontRenderer.toGreyscale( colour );
-                PALETTE_BUFFER.put( f )
-                    .put( f )
-                    .put( f );
+                paletteBuffer.put( f ).put( f ).put( f );
             }
             else
             {
-                PALETTE_BUFFER.put( (float) colour[0] )
-                    .put( (float) colour[1] )
-                    .put( (float) colour[2] );
+                paletteBuffer.put( (float) colour[0] ).put( (float) colour[1] ).put( (float) colour[2] );
             }
         }
-        PALETTE_BUFFER.flip();
-        RenderSystem.glUniform3( uniformPalette, PALETTE_BUFFER );
-    }
-
-    static boolean use()
-    {
-        if( initialised )
-        {
-            if( ok )
-            {
-                GlStateManager.useProgram( program );
-            }
-            return ok;
-        }
-
-        if( ok = load() )
-        {
-            GL20.glUseProgram( program );
-            RenderSystem.glUniform1i( uniformFont, 0 );
-            RenderSystem.glUniform1i( uniformTbo, TEXTURE_INDEX - GL13.GL_TEXTURE0 );
-        }
-
-        return ok;
-    }
-
-    private static boolean load()
-    {
-        initialised = true;
-
-        try
-        {
-            int vertexShader = loadShader( GL20.GL_VERTEX_SHADER, "assets/computercraft/shaders/monitor.vert" );
-            int fragmentShader = loadShader( GL20.GL_FRAGMENT_SHADER, "assets/computercraft/shaders/monitor.frag" );
-
-            program = GlStateManager.createProgram();
-            GlStateManager.attachShader( program, vertexShader );
-            GlStateManager.attachShader( program, fragmentShader );
-            GL20.glBindAttribLocation( program, 0, "v_pos" );
-
-            GlStateManager.linkProgram( program );
-            boolean ok = GlStateManager.getProgram( program, GL20.GL_LINK_STATUS ) != 0;
-            String log = GlStateManager.getProgramInfoLog( program, Short.MAX_VALUE )
-                .trim();
-            if( !Strings.isNullOrEmpty( log ) )
-            {
-                ComputerCraft.log.warn( "Problems when linking monitor shader: {}", log );
-            }
-
-            GL20.glDetachShader( program, vertexShader );
-            GL20.glDetachShader( program, fragmentShader );
-            GlStateManager.deleteShader( vertexShader );
-            GlStateManager.deleteShader( fragmentShader );
-
-            if( !ok )
-            {
-                return false;
-            }
-
-            uniformMv = getUniformLocation( program, "u_mv" );
-            uniformFont = getUniformLocation( program, "u_font" );
-            uniformWidth = getUniformLocation( program, "u_width" );
-            uniformHeight = getUniformLocation( program, "u_height" );
-            uniformTbo = getUniformLocation( program, "u_tbo" );
-            uniformPalette = getUniformLocation( program, "u_palette" );
-
-            ComputerCraft.log.info( "Loaded monitor shader." );
-            return true;
-        }
-        catch( Exception e )
-        {
-            ComputerCraft.log.error( "Cannot load monitor shaders", e );
-            return false;
-        }
     }
 
-    private static int loadShader( int kind, String path )
+    @Override
+    public void bind()
     {
-        InputStream stream = TileEntityMonitorRenderer.class.getClassLoader()
-            .getResourceAsStream( path );
-        if( stream == null )
-        {
-            throw new IllegalArgumentException( "Cannot find " + path );
-        }
-        String contents = TextureUtil.readAllToString( stream );
-
-        int shader = GlStateManager.createShader( kind );
-
-        GlStateManager.shaderSource( shader, contents );
-        GlStateManager.compileShader( shader );
-
-        boolean ok = GlStateManager.getShader( shader, GL20.GL_COMPILE_STATUS ) != 0;
-        String log = GlStateManager.getShaderInfoLog( shader, Short.MAX_VALUE )
-            .trim();
-        if( !Strings.isNullOrEmpty( log ) )
-        {
-            ComputerCraft.log.warn( "Problems when loading monitor shader {}: {}", path, log );
-        }
-
-        if( !ok )
-        {
-            throw new IllegalStateException( "Cannot compile shader " + path );
-        }
-        return shader;
+        super.bind();
+        palette.upload();
     }
 
-    private static int getUniformLocation( int program, String name )
+    @Override
+    public void close()
     {
-        int uniform = GlStateManager.getUniformLocation( program, name );
-        if( uniform == -1 )
+        palette.close();
+        super.close();
+    }
+
+    private void updateUniformLocation( GlUniform uniform )
+    {
+        int id = GlUniform.getUniformLocation( getProgramRef(), uniform.getName() );
+        if( id == -1 )
         {
-            throw new IllegalStateException( "Cannot find uniform " + name );
+            LOGGER.warn( "Shader {} could not find uniform named {} in the specified shader program.", getName(), uniform.getName() );
         }
+        else
+        {
+            uniform.setLoc( id );
+        }
+    }
+
+    @Nullable
+    private GlUniform getUniformChecked( String name )
+    {
+        GlUniform uniform = getUniform( name );
+        if( uniform == null )
+        {
+            LOGGER.warn( "Monitor shader {} should have uniform {}, but it was not present.", getName(), name );
+        }
+
         return uniform;
     }
 }

src/main/java/dan200/computercraft/client/render/PrintoutRenderer.java

@@ -9,10 +9,9 @@ package dan200.computercraft.client.render;
 import dan200.computercraft.client.gui.FixedWidthFontRenderer;
 import dan200.computercraft.core.terminal.TextBuffer;
 import dan200.computercraft.shared.util.Palette;
-import net.minecraft.client.render.*;
-import net.minecraft.util.Identifier;
+import net.minecraft.client.render.VertexConsumer;
+import net.minecraft.client.render.VertexConsumerProvider;
 import net.minecraft.util.math.Matrix4f;
-import org.lwjgl.opengl.GL11;
 
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.FONT_HEIGHT;
 import static dan200.computercraft.shared.media.items.ItemPrintout.LINES_PER_PAGE;
@@ -39,7 +38,6 @@ public final class PrintoutRenderer
      * Size of the leather cover.
      */
     public static final int COVER_SIZE = 12;
-    private static final Identifier BG = new Identifier( "computercraft", "textures/gui/printout.png" );
     private static final float BG_SIZE = 256.0f;
     /**
      * Width of the extra page texture.
@@ -50,9 +48,9 @@ public final class PrintoutRenderer
 
     private PrintoutRenderer() {}
 
-    public static void drawText( Matrix4f transform, VertexConsumerProvider renderer, int x, int y, int start, TextBuffer[] text, TextBuffer[] colours )
+    public static void drawText( Matrix4f transform, VertexConsumerProvider renderer, int x, int y, int start, int light, TextBuffer[] text, TextBuffer[] colours )
     {
-        VertexConsumer buffer = renderer.getBuffer( FixedWidthFontRenderer.TYPE );
+        VertexConsumer buffer = renderer.getBuffer( RenderTypes.PRINTOUT_TEXT );
         for( int line = 0; line < LINES_PER_PAGE && line < text.length; line++ )
         {
             FixedWidthFontRenderer.drawString( transform,
@@ -65,13 +63,14 @@ public final class PrintoutRenderer
                 Palette.DEFAULT,
                 false,
                 0,
-                0 );
+                0,
+                light );
         }
     }
 
-    public static void drawText( Matrix4f transform, VertexConsumerProvider renderer, int x, int y, int start, String[] text, String[] colours )
+    public static void drawText( Matrix4f transform, VertexConsumerProvider renderer, int x, int y, int start, int light, String[] text, String[] colours )
     {
-        VertexConsumer buffer = renderer.getBuffer( FixedWidthFontRenderer.TYPE );
+        VertexConsumer buffer = renderer.getBuffer( RenderTypes.PRINTOUT_TEXT );
         for( int line = 0; line < LINES_PER_PAGE && line < text.length; line++ )
         {
             FixedWidthFontRenderer.drawString( transform,
@@ -84,16 +83,17 @@ public final class PrintoutRenderer
                 Palette.DEFAULT,
                 false,
                 0,
-                0 );
+                0,
+                light );
         }
     }
 
-    public static void drawBorder( Matrix4f transform, VertexConsumerProvider renderer, float x, float y, float z, int page, int pages, boolean isBook )
+    public static void drawBorder( Matrix4f transform, VertexConsumerProvider renderer, float x, float y, float z, int page, int pages, boolean isBook, int light )
     {
         int leftPages = page;
         int rightPages = pages - page - 1;
 
-        VertexConsumer buffer = renderer.getBuffer( Type.TYPE );
+        VertexConsumer buffer = renderer.getBuffer( RenderTypes.PRINTOUT_BACKGROUND );
 
         if( isBook )
         {
@@ -103,8 +103,8 @@ public final class PrintoutRenderer
             float right = x + X_SIZE + offset - 4;
 
             // Left and right border
-            drawTexture( transform, buffer, left - 4, y - 8, z - 0.02f, COVER_X, 0, COVER_SIZE, Y_SIZE + COVER_SIZE * 2 );
-            drawTexture( transform, buffer, right, y - 8, z - 0.02f, COVER_X + COVER_SIZE, 0, COVER_SIZE, Y_SIZE + COVER_SIZE * 2 );
+            drawTexture( transform, buffer, left - 4, y - 8, z - 0.02f, COVER_X, 0, COVER_SIZE, Y_SIZE + COVER_SIZE * 2, light );
+            drawTexture( transform, buffer, right, y - 8, z - 0.02f, COVER_X + COVER_SIZE, 0, COVER_SIZE, Y_SIZE + COVER_SIZE * 2, light );
 
             // Draw centre panel (just stretched texture, sorry).
             drawTexture( transform,
@@ -117,34 +117,35 @@ public final class PrintoutRenderer
                 COVER_X + COVER_SIZE / 2.0f,
                 COVER_SIZE,
                 COVER_SIZE,
-                Y_SIZE );
+                Y_SIZE,
+                light );
 
             float borderX = left;
             while( borderX < right )
             {
                 double thisWidth = Math.min( right - borderX, X_SIZE );
-                drawTexture( transform, buffer, borderX, y - 8, z - 0.02f, 0, COVER_Y, (float) thisWidth, COVER_SIZE );
-                drawTexture( transform, buffer, borderX, y + Y_SIZE - 4, z - 0.02f, 0, COVER_Y + COVER_SIZE, (float) thisWidth, COVER_SIZE );
+                drawTexture( transform, buffer, borderX, y - 8, z - 0.02f, 0, COVER_Y, (float) thisWidth, COVER_SIZE, light );
+                drawTexture( transform, buffer, borderX, y + Y_SIZE - 4, z - 0.02f, 0, COVER_Y + COVER_SIZE, (float) thisWidth, COVER_SIZE, light );
                 borderX += thisWidth;
             }
         }
 
         // Left half
-        drawTexture( transform, buffer, x, y, z, X_FOLD_SIZE * 2, 0, X_SIZE / 2.0f, Y_SIZE );
+        drawTexture( transform, buffer, x, y, z, X_FOLD_SIZE * 2, 0, X_SIZE / 2.0f, Y_SIZE, light );
         for( int n = 0; n <= leftPages; n++ )
         {
             drawTexture( transform, buffer, x - offsetAt( n ), y, z - 1e-3f * n,
                 // Use the left "bold" fold for the outermost page
-                n == leftPages ? 0 : X_FOLD_SIZE, 0, X_FOLD_SIZE, Y_SIZE );
+                n == leftPages ? 0 : X_FOLD_SIZE, 0, X_FOLD_SIZE, Y_SIZE, light );
         }
 
         // Right half
-        drawTexture( transform, buffer, x + X_SIZE / 2.0f, y, z, X_FOLD_SIZE * 2 + X_SIZE / 2.0f, 0, X_SIZE / 2.0f, Y_SIZE );
+        drawTexture( transform, buffer, x + X_SIZE / 2.0f, y, z, X_FOLD_SIZE * 2 + X_SIZE / 2.0f, 0, X_SIZE / 2.0f, Y_SIZE, light );
         for( int n = 0; n <= rightPages; n++ )
         {
             drawTexture( transform, buffer, x + (X_SIZE - X_FOLD_SIZE) + offsetAt( n ), y, z - 1e-3f * n,
                 // Two folds, then the main page. Use the right "bold" fold for the outermost page.
-                X_FOLD_SIZE * 2 + X_SIZE + (n == rightPages ? X_FOLD_SIZE : 0), 0, X_FOLD_SIZE, Y_SIZE );
+                X_FOLD_SIZE * 2 + X_SIZE + (n == rightPages ? X_FOLD_SIZE : 0), 0, X_FOLD_SIZE, Y_SIZE, light );
         }
     }
 
@@ -153,57 +154,25 @@ public final class PrintoutRenderer
         return (float) (32 * (1 - Math.pow( 1.2, -page )));
     }
 
-    private static void drawTexture( Matrix4f matrix, VertexConsumer buffer, float x, float y, float z, float u, float v, float width, float height )
+    private static void drawTexture( Matrix4f matrix, VertexConsumer buffer, float x, float y, float z, float u, float v, float width, float height, int light )
     {
-        buffer.vertex( matrix, x, y + height, z )
-            .texture( u / BG_SIZE, (v + height) / BG_SIZE )
-            .next();
-        buffer.vertex( matrix, x + width, y + height, z )
-            .texture( (u + width) / BG_SIZE, (v + height) / BG_SIZE )
-            .next();
-        buffer.vertex( matrix, x + width, y, z )
-            .texture( (u + width) / BG_SIZE, v / BG_SIZE )
-            .next();
-        buffer.vertex( matrix, x, y, z )
-            .texture( u / BG_SIZE, v / BG_SIZE )
-            .next();
+        vertex( buffer, matrix, x, y + height, z, u / BG_SIZE, (v + height) / BG_SIZE, light );
+        vertex( buffer, matrix, x + width, y + height, z, (u + width) / BG_SIZE, (v + height) / BG_SIZE, light );
+        vertex( buffer, matrix, x + width, y, z, (u + width) / BG_SIZE, v / BG_SIZE, light );
+        vertex( buffer, matrix, x, y, z, u / BG_SIZE, v / BG_SIZE, light );
     }
 
     private static void drawTexture( Matrix4f matrix, VertexConsumer buffer, float x, float y, float z, float width, float height, float u, float v,
-                                     float tWidth, float tHeight )
+                                     float tWidth, float tHeight, int light )
     {
-        buffer.vertex( matrix, x, y + height, z )
-            .texture( u / BG_SIZE, (v + tHeight) / BG_SIZE )
-            .next();
-        buffer.vertex( matrix, x + width, y + height, z )
-            .texture( (u + tWidth) / BG_SIZE, (v + tHeight) / BG_SIZE )
-            .next();
-        buffer.vertex( matrix, x + width, y, z )
-            .texture( (u + tWidth) / BG_SIZE, v / BG_SIZE )
-            .next();
-        buffer.vertex( matrix, x, y, z )
-            .texture( u / BG_SIZE, v / BG_SIZE )
-            .next();
+        vertex( buffer, matrix, x, y + height, z, u / BG_SIZE, (v + tHeight) / BG_SIZE, light );
+        vertex( buffer, matrix, x + width, y + height, z, (u + tWidth) / BG_SIZE, (v + tHeight) / BG_SIZE, light );
+        vertex( buffer, matrix, x + width, y, z, (u + tWidth) / BG_SIZE, v / BG_SIZE, light );
+        vertex( buffer, matrix, x, y, z, u / BG_SIZE, v / BG_SIZE, light );
     }
 
-    private static final class Type extends RenderPhase
+    private static void vertex( VertexConsumer buffer, Matrix4f matrix, float x, float y, float z, float u, float v, int light )
     {
-        static final RenderLayer TYPE = RenderLayer.of( "printout_background",
-            VertexFormats.POSITION_TEXTURE,
-            GL11.GL_QUADS,
-            1024,
-            false,
-            false,
-            // useDelegate, needsSorting
-            RenderLayer.MultiPhaseParameters.builder()
-                .texture( new RenderPhase.Texture( BG, false, false ) ) // blur, minimap
-                .alpha( ONE_TENTH_ALPHA )
-                .lightmap( DISABLE_LIGHTMAP )
-                .build( false ) );
-
-        private Type( String name, Runnable setup, Runnable destroy )
-        {
-            super( name, setup, destroy );
-        }
+        buffer.vertex( matrix, x, y, z ).color( 255, 255, 255, 255 ).texture( u, v ).light( light ).next();
     }
 }

src/main/java/dan200/computercraft/client/render/RenderTypes.java

@@ -0,0 +1,117 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.client.render;
+
+import dan200.computercraft.client.gui.FixedWidthFontRenderer;
+import net.minecraft.client.render.*;
+import net.minecraft.util.Identifier;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+public class RenderTypes
+{
+
+    public static final int FULL_BRIGHT_LIGHTMAP = (0xF << 4) | (0xF << 20);
+
+    @Nullable
+    public static MonitorTextureBufferShader monitorTboShader;
+
+    @Nullable
+    public static Shader terminalShader;
+
+    public static final RenderLayer TERMINAL_WITHOUT_DEPTH = Types.TERMINAL_WITHOUT_DEPTH;
+    public static final RenderLayer MONITOR_TBO = Types.MONITOR_TBO;
+    public static final RenderLayer TERMINAL_BLOCKER = Types.BLOCKER;
+    public static final RenderLayer TERMINAL_WITH_DEPTH = Types.TERMINAL_WITH_DEPTH;
+    public static final RenderLayer PRINTOUT_TEXT = Types.PRINTOUT_TEXT;
+
+    public static final RenderLayer PRINTOUT_BACKGROUND = RenderLayer.getText( new Identifier( "computercraft", "textures/gui/printout.png" ) );
+
+    public static final RenderLayer POSITION_COLOR = Types.POSITION_COLOR;
+
+    @Nonnull
+    static MonitorTextureBufferShader getMonitorTextureBufferShader()
+    {
+        if( monitorTboShader == null ) throw new NullPointerException( "MonitorTboShader has not been registered" );
+        return monitorTboShader;
+    }
+
+    @Nonnull
+    static Shader getTerminalShader()
+    {
+        if( terminalShader == null ) throw new NullPointerException( "MonitorTboShader has not been registered" );
+        return terminalShader;
+    }
+
+    private static final class Types extends RenderPhase
+    {
+        private static final VertexFormat.DrawMode GL_MODE = VertexFormat.DrawMode.TRIANGLES;
+        private static final VertexFormat FORMAT = VertexFormats.POSITION_COLOR_TEXTURE;
+        private static final Shader TERM_SHADER = new Shader( RenderTypes::getTerminalShader );
+
+        private static final RenderPhase.Texture TERM_FONT_TEXTURE = new RenderPhase.Texture(
+            FixedWidthFontRenderer.FONT,
+            false, false // blur, minimap
+        );
+
+        public static final RenderLayer MONITOR_TBO = RenderLayer.of( "monitor_tbo", VertexFormats.POSITION_TEXTURE, VertexFormat.DrawMode.TRIANGLE_STRIP, 128, false, false, // useDelegate, needsSorting
+            RenderLayer.MultiPhaseParameters.builder()
+                .texture( TERM_FONT_TEXTURE ) // blur, minimap
+                .shader( new RenderPhase.Shader( RenderTypes::getMonitorTextureBufferShader ) )
+                .writeMaskState( RenderLayer.ALL_MASK )
+                .build( false ) );
+
+        static final RenderLayer TERMINAL_WITHOUT_DEPTH = RenderLayer.of(
+            "terminal_without_depth", FORMAT, GL_MODE, 1024,
+            false, false, // useDelegate, needsSorting
+            RenderLayer.MultiPhaseParameters.builder()
+                .texture( TERM_FONT_TEXTURE )
+                .shader( TERM_SHADER )
+                .writeMaskState( COLOR_MASK )
+                .build( false )
+        );
+
+        static final RenderLayer BLOCKER = RenderLayer.of( "terminal_blocker", FORMAT, GL_MODE, 256, false, false, // useDelegate, needsSorting
+            RenderLayer.MultiPhaseParameters.builder()
+                .texture( TERM_FONT_TEXTURE )
+                .shader( TERM_SHADER )
+                .writeMaskState( DEPTH_MASK )
+                .build( false ) );
+
+        static final RenderLayer TERMINAL_WITH_DEPTH = RenderLayer.of(
+            "terminal_with_depth", FORMAT, GL_MODE, 1024,
+            false, false, // useDelegate, needsSorting
+            RenderLayer.MultiPhaseParameters.builder()
+                .texture( TERM_FONT_TEXTURE )
+                .shader( TERM_SHADER )
+                .build( false )
+        );
+
+        static final RenderLayer PRINTOUT_TEXT = RenderLayer.of(
+            "printout_text", VertexFormats.POSITION_COLOR_TEXTURE_LIGHT, GL_MODE, 1024,
+            false, false, // useDelegate, needsSorting
+            RenderLayer.MultiPhaseParameters.builder()
+                .texture( TERM_FONT_TEXTURE )
+                .shader( RenderPhase.TEXT_SHADER )
+                .lightmap( RenderPhase.ENABLE_LIGHTMAP )
+                .build( false )
+        );
+
+        static final RenderLayer POSITION_COLOR = RenderLayer.of(
+            "position_color", VertexFormats.POSITION_COLOR, VertexFormat.DrawMode.QUADS, 128,
+            false, false, // useDelegate, needsSorting
+            RenderLayer.MultiPhaseParameters.builder()
+                .shader( COLOR_SHADER )
+                .build( false )
+        );
+
+        private Types( String name, Runnable setup, Runnable destroy )
+        {
+            super( name, setup, destroy );
+        }
+    }
+}

src/main/java/dan200/computercraft/client/render/TileEntityMonitorRenderer.java

@@ -7,6 +7,8 @@
 package dan200.computercraft.client.render;
 
 import com.mojang.blaze3d.platform.GlStateManager;
+import com.mojang.blaze3d.systems.RenderSystem;
+import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.client.FrameInfo;
 import dan200.computercraft.client.gui.FixedWidthFontRenderer;
 import dan200.computercraft.core.terminal.Terminal;
@@ -18,17 +20,11 @@ import dan200.computercraft.shared.util.Colour;
 import dan200.computercraft.shared.util.DirectionUtil;
 import net.minecraft.client.gl.VertexBuffer;
 import net.minecraft.client.render.*;
-import net.minecraft.client.render.block.entity.BlockEntityRenderDispatcher;
 import net.minecraft.client.render.block.entity.BlockEntityRenderer;
-import net.minecraft.client.util.GlAllocationUtils;
-import net.minecraft.client.util.math.AffineTransformation;
+import net.minecraft.client.render.block.entity.BlockEntityRendererFactory;
 import net.minecraft.client.util.math.MatrixStack;
-import net.minecraft.client.util.math.Vector3f;
-import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.math.Direction;
-import net.minecraft.util.math.Matrix4f;
+import net.minecraft.util.math.*;
 import org.lwjgl.opengl.GL11;
-import org.lwjgl.opengl.GL13;
 import org.lwjgl.opengl.GL20;
 import org.lwjgl.opengl.GL31;
 
@@ -36,8 +32,9 @@ import javax.annotation.Nonnull;
 import java.nio.ByteBuffer;
 
 import static dan200.computercraft.client.gui.FixedWidthFontRenderer.*;
+import static net.minecraft.client.util.GlAllocationUtils.allocateByteBuffer;
 
-public class TileEntityMonitorRenderer extends BlockEntityRenderer<TileMonitor>
+public class TileEntityMonitorRenderer implements BlockEntityRenderer<TileMonitor>
 {
     /**
      * {@link TileMonitor#RENDER_MARGIN}, but a tiny bit of additional padding to ensure that there is no space between the monitor frame and contents.
@@ -47,11 +44,10 @@ public class TileEntityMonitorRenderer extends BlockEntityRenderer<TileMonitor>
         .getMatrix();
     private static ByteBuffer tboContents;
 
-    public TileEntityMonitorRenderer( BlockEntityRenderDispatcher rendererDispatcher )
+    public TileEntityMonitorRenderer( BlockEntityRendererFactory.Context context )
     {
-        super( rendererDispatcher );
+        // super( context );
     }
-
     @Override
     public void render( @Nonnull TileMonitor monitor, float partialTicks, @Nonnull MatrixStack transform, @Nonnull VertexConsumerProvider renderer,
                         int lightmapCoord, int overlayLight )
@@ -89,25 +85,14 @@ public class TileEntityMonitorRenderer extends BlockEntityRenderer<TileMonitor>
             originPos.getY() - monitorPos.getY() + 0.5,
             originPos.getZ() - monitorPos.getZ() + 0.5 );
 
-        transform.multiply( Vector3f.NEGATIVE_Y.getDegreesQuaternion( yaw ) );
-        transform.multiply( Vector3f.POSITIVE_X.getDegreesQuaternion( pitch ) );
+        transform.multiply( Vec3f.NEGATIVE_Y.getDegreesQuaternion( yaw ) );
+        transform.multiply( Vec3f.POSITIVE_X.getDegreesQuaternion( pitch ) );
         transform.translate( -0.5 + TileMonitor.RENDER_BORDER + TileMonitor.RENDER_MARGIN,
             origin.getHeight() - 0.5 - (TileMonitor.RENDER_BORDER + TileMonitor.RENDER_MARGIN) + 0,
             0.50 );
         double xSize = origin.getWidth() - 2.0 * (TileMonitor.RENDER_MARGIN + TileMonitor.RENDER_BORDER);
         double ySize = origin.getHeight() - 2.0 * (TileMonitor.RENDER_MARGIN + TileMonitor.RENDER_BORDER);
 
-        // Draw the background blocker
-        FixedWidthFontRenderer.drawBlocker( transform.peek().getModel(),
-            renderer,
-            (float) -TileMonitor.RENDER_MARGIN,
-            (float) TileMonitor.RENDER_MARGIN,
-            (float) (xSize + 2 * TileMonitor.RENDER_MARGIN),
-            (float) -(ySize + TileMonitor.RENDER_MARGIN * 2) );
-
-        // Set the contents slightly off the surface to prevent z-fighting
-        transform.translate( 0.0, 0.0, 0.001 );
-
         // Draw the contents
         Terminal terminal = originTerminal.getTerminal();
         if( terminal != null )
@@ -122,23 +107,22 @@ public class TileEntityMonitorRenderer extends BlockEntityRenderer<TileMonitor>
 
             Matrix4f matrix = transform.peek().getModel();
 
-            // Sneaky hack here: we get a buffer now in order to flush existing ones and set up the appropriate
-            // render state. I've no clue how well this'll work in future versions of Minecraft, but it does the trick
-            // for now.
-            VertexConsumer buffer = renderer.getBuffer( FixedWidthFontRenderer.TYPE );
-            FixedWidthFontRenderer.TYPE.startDrawing();
-
-            renderTerminal( matrix, originTerminal, (float) (MARGIN / xScale), (float) (MARGIN / yScale) );
+            renderTerminal( renderer, matrix, originTerminal, (float) (MARGIN / xScale), (float) (MARGIN / yScale) );
 
             // We don't draw the cursor with the VBO, as it's dynamic and so we'll end up refreshing far more than is
             // reasonable.
-            FixedWidthFontRenderer.drawCursor( matrix, buffer, 0, 0, terminal, !originTerminal.isColour() );
-
-            // To go along with sneaky hack above: make sure state changes are undone. I would have thought this would
-            // happen automatically after these buffers are drawn, but chests will render weird around monitors without this.
-            FixedWidthFontRenderer.TYPE.endDrawing();
+            FixedWidthFontRenderer.drawCursor( matrix, renderer.getBuffer( RenderTypes.TERMINAL_WITHOUT_DEPTH ), 0, 0, terminal, !originTerminal.isColour() );
 
             transform.pop();
+
+            // Draw the background blocker
+            FixedWidthFontRenderer.drawBlocker(
+                transform.peek().getModel(), renderer,
+                -MARGIN, MARGIN,
+                (float) (xSize + 2 * MARGIN), (float) -(ySize + MARGIN * 2)
+            );
+
+            renderer.getBuffer( RenderLayer.getSolid() );
         }
         else
         {
@@ -154,7 +138,7 @@ public class TileEntityMonitorRenderer extends BlockEntityRenderer<TileMonitor>
         transform.pop();
     }
 
-    private static void renderTerminal( Matrix4f matrix, ClientMonitor monitor, float xMargin, float yMargin )
+    private static void renderTerminal( VertexConsumerProvider renderer, Matrix4f matrix, ClientMonitor monitor, float xMargin, float yMargin )
     {
         Terminal terminal = monitor.getTerminal();
 
@@ -169,10 +153,6 @@ public class TileEntityMonitorRenderer extends BlockEntityRenderer<TileMonitor>
         {
             case TBO:
             {
-                if( !MonitorTextureBufferShader.use() )
-                {
-                    return;
-                }
 
                 int width = terminal.getWidth(), height = terminal.getHeight();
                 int pixelWidth = width * FONT_WIDTH, pixelHeight = height * FONT_HEIGHT;
@@ -182,7 +162,7 @@ public class TileEntityMonitorRenderer extends BlockEntityRenderer<TileMonitor>
                     int size = width * height * 3;
                     if( tboContents == null || tboContents.capacity() < size )
                     {
-                        tboContents = GlAllocationUtils.allocateByteBuffer( size );
+                        tboContents = allocateByteBuffer( size );
                     }
 
                     ByteBuffer monitorBuffer = tboContents;
@@ -199,32 +179,27 @@ public class TileEntityMonitorRenderer extends BlockEntityRenderer<TileMonitor>
                     }
                     monitorBuffer.flip();
 
-                    GlStateManager.bindBuffers( GL31.GL_TEXTURE_BUFFER, monitor.tboBuffer );
-                    GlStateManager.bufferData( GL31.GL_TEXTURE_BUFFER, monitorBuffer, GL20.GL_STATIC_DRAW );
-                    GlStateManager.bindBuffers( GL31.GL_TEXTURE_BUFFER, 0 );
+                    GlStateManager._glBindBuffer( GL31.GL_TEXTURE_BUFFER, monitor.tboBuffer );
+                    GlStateManager._glBufferData( GL31.GL_TEXTURE_BUFFER, monitorBuffer, GL20.GL_STATIC_DRAW );
+                    GlStateManager._glBindBuffer( GL31.GL_TEXTURE_BUFFER, 0 );
                 }
 
                 // Nobody knows what they're doing!
-                GlStateManager.activeTexture( MonitorTextureBufferShader.TEXTURE_INDEX );
+                int active = GlStateManager._getActiveTexture();
+                RenderSystem.activeTexture( MonitorTextureBufferShader.TEXTURE_INDEX );
                 GL11.glBindTexture( GL31.GL_TEXTURE_BUFFER, monitor.tboTexture );
-                GlStateManager.activeTexture( GL13.GL_TEXTURE0 );
+                RenderSystem.activeTexture( active );
 
-                MonitorTextureBufferShader.setupUniform( matrix, width, height, terminal.getPalette(), !monitor.isColour() );
+                MonitorTextureBufferShader shader = RenderTypes.getMonitorTextureBufferShader();
+                shader.setupUniform( width, height, terminal.getPalette(), !monitor.isColour() );
 
-                Tessellator tessellator = Tessellator.getInstance();
-                BufferBuilder buffer = tessellator.getBuffer();
-                buffer.begin( GL11.GL_TRIANGLE_STRIP, VertexFormats.POSITION );
-                buffer.vertex( -xMargin, -yMargin, 0 )
-                    .next();
-                buffer.vertex( -xMargin, pixelHeight + yMargin, 0 )
-                    .next();
-                buffer.vertex( pixelWidth + xMargin, -yMargin, 0 )
-                    .next();
-                buffer.vertex( pixelWidth + xMargin, pixelHeight + yMargin, 0 )
-                    .next();
-                tessellator.draw();
+                VertexConsumer buffer = renderer.getBuffer( RenderTypes.MONITOR_TBO );
+                tboVertex( buffer, matrix, -xMargin, -yMargin );
+                tboVertex( buffer, matrix, -xMargin, pixelHeight + yMargin );
+                tboVertex( buffer, matrix, pixelWidth + xMargin, -yMargin );
+                tboVertex( buffer, matrix, pixelWidth + xMargin, pixelHeight + yMargin );
 
-                GlStateManager.useProgram( 0 );
+                renderer.getBuffer( RenderTypes.TERMINAL_WITHOUT_DEPTH );
                 break;
             }
 
@@ -234,7 +209,7 @@ public class TileEntityMonitorRenderer extends BlockEntityRenderer<TileMonitor>
                 {
                     Tessellator tessellator = Tessellator.getInstance();
                     BufferBuilder builder = tessellator.getBuffer();
-                    builder.begin( FixedWidthFontRenderer.TYPE.getDrawMode(), FixedWidthFontRenderer.TYPE.getVertexFormat() );
+                    builder.begin( RenderTypes.TERMINAL_WITHOUT_DEPTH.getDrawMode(), RenderTypes.TERMINAL_WITHOUT_DEPTH.getVertexFormat() );
                     FixedWidthFontRenderer.drawTerminalWithoutCursor( IDENTITY,
                         builder,
                         0,
@@ -250,14 +225,23 @@ public class TileEntityMonitorRenderer extends BlockEntityRenderer<TileMonitor>
                     vbo.upload( builder );
                 }
 
-                vbo.bind();
-                FixedWidthFontRenderer.TYPE.getVertexFormat()
-                    .startDrawing( 0L );
-                vbo.draw( matrix, FixedWidthFontRenderer.TYPE.getDrawMode() );
-                VertexBuffer.unbind();
-                FixedWidthFontRenderer.TYPE.getVertexFormat()
-                    .endDrawing();
+                renderer.getBuffer( RenderTypes.TERMINAL_WITHOUT_DEPTH );
+
+                RenderTypes.TERMINAL_WITHOUT_DEPTH.startDrawing();
+                vbo.setShader( matrix, RenderSystem.getProjectionMatrix(), RenderTypes.getTerminalShader() );
                 break;
         }
     }
+
+    private static void tboVertex( VertexConsumer builder, Matrix4f matrix, float x, float y )
+    {
+        // We encode position in the UV, as that's not transformed by the matrix.
+        builder.vertex( matrix, x, y, 0 ).texture( x, y ).next();
+    }
+
+    @Override
+    public int getRenderDistance()
+    {
+        return ComputerCraft.monitorDistance;
+    }
 }

src/main/java/dan200/computercraft/client/render/TileEntityTurtleRenderer.java

@@ -3,7 +3,6 @@
  * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
  * Send enquiries to dratcliffe@gmail.com
  */
-
 package dan200.computercraft.client.render;
 
 import dan200.computercraft.api.client.TransformedModel;
@@ -21,24 +20,25 @@ import net.minecraft.client.render.VertexConsumer;
 import net.minecraft.client.render.VertexConsumerProvider;
 import net.minecraft.client.render.block.entity.BlockEntityRenderDispatcher;
 import net.minecraft.client.render.block.entity.BlockEntityRenderer;
+import net.minecraft.client.render.block.entity.BlockEntityRendererFactory;
 import net.minecraft.client.render.model.BakedModel;
 import net.minecraft.client.render.model.BakedModelManager;
 import net.minecraft.client.render.model.BakedQuad;
 import net.minecraft.client.util.ModelIdentifier;
 import net.minecraft.client.util.math.MatrixStack;
-import net.minecraft.client.util.math.Vector3f;
 import net.minecraft.util.Identifier;
 import net.minecraft.util.hit.BlockHitResult;
 import net.minecraft.util.hit.HitResult;
 import net.minecraft.util.math.Direction;
 import net.minecraft.util.math.Matrix4f;
 import net.minecraft.util.math.Vec3d;
+import net.minecraft.util.math.Vec3f;
 
 import javax.annotation.Nonnull;
 import java.util.List;
 import java.util.Random;
 
-public class TileEntityTurtleRenderer extends BlockEntityRenderer<TileTurtle>
+public class TileEntityTurtleRenderer implements BlockEntityRenderer<TileTurtle>
 {
     private static final ModelIdentifier NORMAL_TURTLE_MODEL = new ModelIdentifier( "computercraft:turtle_normal", "inventory" );
     private static final ModelIdentifier ADVANCED_TURTLE_MODEL = new ModelIdentifier( "computercraft:turtle_advanced", "inventory" );
@@ -47,9 +47,11 @@ public class TileEntityTurtleRenderer extends BlockEntityRenderer<TileTurtle>
 
     private final Random random = new Random( 0 );
 
-    public TileEntityTurtleRenderer( BlockEntityRenderDispatcher renderDispatcher )
+    BlockEntityRenderDispatcher renderer;
+
+    public TileEntityTurtleRenderer( BlockEntityRendererFactory.Context context )
     {
-        super( renderDispatcher );
+        renderer = context.getRenderDispatcher();
     }
 
     public static ModelIdentifier getTurtleModel( ComputerFamily family, boolean coloured )
@@ -77,6 +79,118 @@ public class TileEntityTurtleRenderer extends BlockEntityRenderer<TileTurtle>
         return null;
     }
 
+    @Override
+    public void render( @Nonnull TileTurtle turtle, float partialTicks, @Nonnull MatrixStack transform, @Nonnull VertexConsumerProvider buffers,
+                        int lightmapCoord, int overlayLight )
+    {
+        // Render the label
+        String label = turtle.createProxy()
+            .getLabel();
+        HitResult hit = renderer.crosshairTarget;
+        if( label != null && hit.getType() == HitResult.Type.BLOCK && turtle.getPos()
+            .equals( ((BlockHitResult) hit).getBlockPos() ) )
+        {
+            MinecraftClient mc = MinecraftClient.getInstance();
+            TextRenderer font = mc.textRenderer;
+
+            transform.push();
+            transform.translate( 0.5, 1.2, 0.5 );
+            transform.multiply( mc.getEntityRenderDispatcher()
+                .getRotation() );
+            transform.scale( -0.025f, -0.025f, 0.025f );
+
+            Matrix4f matrix = transform.peek()
+                .getModel();
+            int opacity = (int) (mc.options.getTextBackgroundOpacity( 0.25f ) * 255) << 24;
+            float width = -font.getWidth( label ) / 2.0f;
+            font.draw( label, width, (float) 0, 0x20ffffff, false, matrix, buffers, true, opacity, lightmapCoord );
+            font.draw( label, width, (float) 0, 0xffffffff, false, matrix, buffers, false, 0, lightmapCoord );
+
+            transform.pop();
+        }
+
+        transform.push();
+
+        // Setup the transform.
+        Vec3d offset = turtle.getRenderOffset( partialTicks );
+        float yaw = turtle.getRenderYaw( partialTicks );
+        transform.translate( offset.x, offset.y, offset.z );
+
+        transform.translate( 0.5f, 0.5f, 0.5f );
+        transform.multiply( Vec3f.POSITIVE_Y.getDegreesQuaternion( 180.0f - yaw ) );
+        if( label != null && (label.equals( "Dinnerbone" ) || label.equals( "Grumm" )) )
+        {
+            // Flip the model
+            transform.scale( 1.0f, -1.0f, 1.0f );
+        }
+        transform.translate( -0.5f, -0.5f, -0.5f );
+
+        // Render the turtle
+        int colour = turtle.getColour();
+        ComputerFamily family = turtle.getFamily();
+        Identifier overlay = turtle.getOverlay();
+
+        VertexConsumer buffer = buffers.getBuffer( TexturedRenderLayers.getEntityTranslucentCull() );
+        renderModel( transform, buffer, lightmapCoord, overlayLight, getTurtleModel( family, colour != -1 ), colour == -1 ? null : new int[] { colour } );
+
+        // Render the overlay
+        ModelIdentifier overlayModel = getTurtleOverlayModel( overlay, HolidayUtil.getCurrentHoliday() == Holiday.CHRISTMAS );
+        if( overlayModel != null )
+        {
+            renderModel( transform, buffer, lightmapCoord, overlayLight, overlayModel, null );
+        }
+
+        // Render the upgrades
+        renderUpgrade( transform, buffer, lightmapCoord, overlayLight, turtle, TurtleSide.LEFT, partialTicks );
+        renderUpgrade( transform, buffer, lightmapCoord, overlayLight, turtle, TurtleSide.RIGHT, partialTicks );
+
+        transform.pop();
+    }
+
+    private void renderUpgrade( @Nonnull MatrixStack transform, @Nonnull VertexConsumer renderer, int lightmapCoord, int overlayLight, TileTurtle turtle,
+                                      TurtleSide side, float f )
+    {
+        ITurtleUpgrade upgrade = turtle.getUpgrade( side );
+        if( upgrade == null )
+        {
+            return;
+        }
+        transform.push();
+
+        float toolAngle = turtle.getToolRenderAngle( side, f );
+        transform.translate( 0.0f, 0.5f, 0.5f );
+        transform.multiply( Vec3f.NEGATIVE_X.getDegreesQuaternion( toolAngle ) );
+        transform.translate( 0.0f, -0.5f, -0.5f );
+
+        TransformedModel model = upgrade.getModel( turtle.getAccess(), side );
+        model.push( transform );
+        renderModel( transform, renderer, lightmapCoord, overlayLight, model.getModel(), null );
+        transform.pop();
+
+        transform.pop();
+    }
+
+    private void renderModel( @Nonnull MatrixStack transform, @Nonnull VertexConsumer renderer, int lightmapCoord, int overlayLight,
+                                    ModelIdentifier modelLocation, int[] tints )
+    {
+        BakedModelManager modelManager = MinecraftClient.getInstance()
+            .getItemRenderer()
+            .getModels()
+            .getModelManager();
+        renderModel( transform, renderer, lightmapCoord, overlayLight, modelManager.getModel( modelLocation ), tints );
+    }
+
+    private void renderModel( @Nonnull MatrixStack transform, @Nonnull VertexConsumer renderer, int lightmapCoord, int overlayLight, BakedModel model,
+                                    int[] tints )
+    {
+        random.setSeed( 0 );
+        renderQuads( transform, renderer, lightmapCoord, overlayLight, model.getQuads( null, null, random ), tints );
+        for( Direction facing : DirectionUtil.FACINGS )
+        {
+            renderQuads( transform, renderer, lightmapCoord, overlayLight, model.getQuads( null, facing, random ), tints );
+        }
+    }
+
     private static void renderQuads( @Nonnull MatrixStack transform, @Nonnull VertexConsumer buffer, int lightmapCoord, int overlayLight,
                                      List<BakedQuad> quads, int[] tints )
     {
@@ -108,117 +222,4 @@ public class TileEntityTurtleRenderer extends BlockEntityRenderer<TileTurtle>
                 true );
         }
     }
-
-    @Override
-    public void render( @Nonnull TileTurtle turtle, float partialTicks, @Nonnull MatrixStack transform, @Nonnull VertexConsumerProvider renderer,
-                        int lightmapCoord, int overlayLight )
-    {
-        // Render the label
-        String label = turtle.createProxy()
-            .getLabel();
-        HitResult hit = dispatcher.crosshairTarget;
-        if( label != null && hit.getType() == HitResult.Type.BLOCK && turtle.getPos()
-            .equals( ((BlockHitResult) hit).getBlockPos() ) )
-        {
-            MinecraftClient mc = MinecraftClient.getInstance();
-            TextRenderer font = mc.textRenderer;
-
-            transform.push();
-            transform.translate( 0.5, 1.2, 0.5 );
-            transform.multiply( mc.getEntityRenderDispatcher()
-                .getRotation() );
-            transform.scale( -0.025f, -0.025f, 0.025f );
-
-            Matrix4f matrix = transform.peek()
-                .getModel();
-            int opacity = (int) (mc.options.getTextBackgroundOpacity( 0.25f ) * 255) << 24;
-            float width = -font.getWidth( label ) / 2.0f;
-            font.draw( label, width, (float) 0, 0x20ffffff, false, matrix, renderer, true, opacity, lightmapCoord );
-            font.draw( label, width, (float) 0, 0xffffffff, false, matrix, renderer, false, 0, lightmapCoord );
-
-            transform.pop();
-        }
-
-        transform.push();
-
-        // Setup the transform.
-        Vec3d offset = turtle.getRenderOffset( partialTicks );
-        float yaw = turtle.getRenderYaw( partialTicks );
-        transform.translate( offset.x, offset.y, offset.z );
-
-        transform.translate( 0.5f, 0.5f, 0.5f );
-        transform.multiply( Vector3f.POSITIVE_Y.getDegreesQuaternion( 180.0f - yaw ) );
-        if( label != null && (label.equals( "Dinnerbone" ) || label.equals( "Grumm" )) )
-        {
-            // Flip the model
-            transform.scale( 1.0f, -1.0f, 1.0f );
-        }
-        transform.translate( -0.5f, -0.5f, -0.5f );
-
-        // Render the turtle
-        int colour = turtle.getColour();
-        ComputerFamily family = turtle.getFamily();
-        Identifier overlay = turtle.getOverlay();
-
-        VertexConsumer buffer = renderer.getBuffer( TexturedRenderLayers.getEntityTranslucentCull() );
-        renderModel( transform, buffer, lightmapCoord, overlayLight, getTurtleModel( family, colour != -1 ), colour == -1 ? null : new int[] { colour } );
-
-        // Render the overlay
-        ModelIdentifier overlayModel = getTurtleOverlayModel( overlay, HolidayUtil.getCurrentHoliday() == Holiday.CHRISTMAS );
-        if( overlayModel != null )
-        {
-            renderModel( transform, buffer, lightmapCoord, overlayLight, overlayModel, null );
-        }
-
-        // Render the upgrades
-        renderUpgrade( transform, buffer, lightmapCoord, overlayLight, turtle, TurtleSide.LEFT, partialTicks );
-        renderUpgrade( transform, buffer, lightmapCoord, overlayLight, turtle, TurtleSide.RIGHT, partialTicks );
-
-        transform.pop();
-    }
-
-    public static void renderUpgrade( @Nonnull MatrixStack transform, @Nonnull VertexConsumer renderer, int lightmapCoord, int overlayLight, TileTurtle turtle,
-                                      TurtleSide side, float f )
-    {
-        ITurtleUpgrade upgrade = turtle.getUpgrade( side );
-        if( upgrade == null )
-        {
-            return;
-        }
-        transform.push();
-
-        float toolAngle = turtle.getToolRenderAngle( side, f );
-        transform.translate( 0.0f, 0.5f, 0.5f );
-        transform.multiply( Vector3f.NEGATIVE_X.getDegreesQuaternion( toolAngle ) );
-        transform.translate( 0.0f, -0.5f, -0.5f );
-
-        TransformedModel model = upgrade.getModel( turtle.getAccess(), side );
-        model.push( transform );
-        TileEntityTurtleRenderer.renderModel( transform, renderer, lightmapCoord, overlayLight, model.getModel(), null );
-        transform.pop();
-
-        transform.pop();
-    }
-
-    public static void renderModel( @Nonnull MatrixStack transform, @Nonnull VertexConsumer renderer, int lightmapCoord, int overlayLight,
-                                    ModelIdentifier modelLocation, int[] tints )
-    {
-        BakedModelManager modelManager = MinecraftClient.getInstance()
-            .getItemRenderer()
-            .getModels()
-            .getModelManager();
-        renderModel( transform, renderer, lightmapCoord, overlayLight, modelManager.getModel( modelLocation ), tints );
-    }
-
-    public static void renderModel( @Nonnull MatrixStack transform, @Nonnull VertexConsumer renderer, int lightmapCoord, int overlayLight, BakedModel model,
-                                    int[] tints )
-    {
-        Random random = new Random();
-        random.setSeed( 0 );
-        renderQuads( transform, renderer, lightmapCoord, overlayLight, model.getQuads( null, null, random ), tints );
-        for( Direction facing : DirectionUtil.FACINGS )
-        {
-            renderQuads( transform, renderer, lightmapCoord, overlayLight, model.getQuads( null, facing, random ), tints );
-        }
-    }
 }

src/main/java/dan200/computercraft/client/render/TurtleMultiModel.java

@@ -15,7 +15,7 @@ import net.minecraft.client.render.model.BakedQuad;
 import net.minecraft.client.render.model.json.ModelOverrideList;
 import net.minecraft.client.render.model.json.ModelTransformation;
 import net.minecraft.client.texture.Sprite;
-import net.minecraft.client.util.math.AffineTransformation;
+import net.minecraft.util.math.AffineTransformation;
 import net.minecraft.util.math.Direction;
 
 import javax.annotation.Nonnull;
@@ -30,7 +30,7 @@ public class TurtleMultiModel implements BakedModel
     private final TransformedModel leftUpgradeModel;
     private final TransformedModel rightUpgradeModel;
     private List<BakedQuad> generalQuads = null;
-    private Map<Direction, List<BakedQuad>> faceQuads = new EnumMap<>( Direction.class );
+    private final Map<Direction, List<BakedQuad>> faceQuads = new EnumMap<>( Direction.class );
 
     public TurtleMultiModel( BakedModel baseModel, BakedModel overlayModel, AffineTransformation generalTransform, TransformedModel leftUpgradeModel,
                              TransformedModel rightUpgradeModel )
@@ -120,9 +120,9 @@ public class TurtleMultiModel implements BakedModel
     @Nonnull
     @Override
     @Deprecated
-    public Sprite getSprite()
+    public Sprite getParticleSprite()
     {
-        return baseModel.getSprite();
+        return baseModel.getParticleSprite();
     }
 
     @Nonnull

src/main/java/dan200/computercraft/client/render/TurtlePlayerRenderer.java

@@ -6,25 +6,19 @@
 package dan200.computercraft.client.render;
 
 import dan200.computercraft.shared.turtle.core.TurtlePlayer;
-import net.fabricmc.fabric.api.client.rendereregistry.v1.EntityRendererRegistry;
 import net.minecraft.client.render.VertexConsumerProvider;
-import net.minecraft.client.render.entity.EntityRenderDispatcher;
 import net.minecraft.client.render.entity.EntityRenderer;
+import net.minecraft.client.render.entity.EntityRendererFactory;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.util.Identifier;
 
 import javax.annotation.Nonnull;
 
 public class TurtlePlayerRenderer extends EntityRenderer<TurtlePlayer>
-{
-    public TurtlePlayerRenderer( EntityRenderDispatcher renderManager )
+{ //FIXME Make sure this isn't an issue. Context was EntityRenderDispatcher.
+    public TurtlePlayerRenderer( EntityRendererFactory.Context context )
     {
-        super( renderManager );
-    }
-
-    public TurtlePlayerRenderer( EntityRenderDispatcher entityRenderDispatcher, EntityRendererRegistry.Context context )
-    {
-        super( entityRenderDispatcher );
+        super( context );
     }
 
     @Override

src/main/java/dan200/computercraft/client/render/TurtleSmartItemModel.java

@@ -3,7 +3,6 @@
  * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
  * Send enquiries to dratcliffe@gmail.com
  */
-
 package dan200.computercraft.client.render;
 
 import com.google.common.base.Objects;
@@ -24,12 +23,12 @@ import net.minecraft.client.render.model.json.ModelOverrideList;
 import net.minecraft.client.render.model.json.ModelTransformation;
 import net.minecraft.client.texture.Sprite;
 import net.minecraft.client.util.ModelIdentifier;
-import net.minecraft.client.util.math.AffineTransformation;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.client.world.ClientWorld;
 import net.minecraft.entity.LivingEntity;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.Identifier;
+import net.minecraft.util.math.AffineTransformation;
 import net.minecraft.util.math.Direction;
 
 import javax.annotation.Nonnull;
@@ -55,8 +54,60 @@ public class TurtleSmartItemModel implements BakedModel
             .getModel() );
     }
 
+    private static class TurtleModelCombination
+    {
+        final boolean colour;
+        final ITurtleUpgrade leftUpgrade;
+        final ITurtleUpgrade rightUpgrade;
+        final Identifier overlay;
+        final boolean christmas;
+        final boolean flip;
+
+        TurtleModelCombination( boolean colour, ITurtleUpgrade leftUpgrade, ITurtleUpgrade rightUpgrade, Identifier overlay, boolean christmas,
+                                boolean flip )
+        {
+            this.colour = colour;
+            this.leftUpgrade = leftUpgrade;
+            this.rightUpgrade = rightUpgrade;
+            this.overlay = overlay;
+            this.christmas = christmas;
+            this.flip = flip;
+        }
+
+        @Override
+        public boolean equals( Object other )
+        {
+            if( other == this )
+            {
+                return true;
+            }
+            if( !(other instanceof TurtleModelCombination otherCombo) )
+            {
+                return false;
+            }
+
+            return otherCombo.colour == colour && otherCombo.leftUpgrade == leftUpgrade && otherCombo.rightUpgrade == rightUpgrade && Objects.equal(
+                otherCombo.overlay, overlay ) && otherCombo.christmas == christmas && otherCombo.flip == flip;
+        }
+
+        @Override
+        public int hashCode()
+        {
+            final int prime = 31;
+            int result = 0;
+            result = prime * result + (colour ? 1 : 0);
+            result = prime * result + (leftUpgrade != null ? leftUpgrade.hashCode() : 0);
+            result = prime * result + (rightUpgrade != null ? rightUpgrade.hashCode() : 0);
+            result = prime * result + (overlay != null ? overlay.hashCode() : 0);
+            result = prime * result + (christmas ? 1 : 0);
+            result = prime * result + (flip ? 1 : 0);
+            return result;
+        }
+    }
+
     private final BakedModel familyModel;
     private final BakedModel colourModel;
+
     private final HashMap<TurtleModelCombination, BakedModel> cachedModels = new HashMap<>();
     private final ModelOverrideList overrides;
 
@@ -70,8 +121,7 @@ public class TurtleSmartItemModel implements BakedModel
         {
             @Nonnull
             @Override
-            public BakedModel apply( @Nonnull BakedModel originalModel, @Nonnull ItemStack stack, @Nullable ClientWorld world,
-                                     @Nullable LivingEntity entity )
+            public BakedModel apply( BakedModel originalModel, ItemStack stack, @Nullable ClientWorld world, @Nullable LivingEntity entity, int seed )
             {
                 ItemTurtle turtle = (ItemTurtle) stack.getItem();
                 int colour = turtle.getColour( stack );
@@ -80,9 +130,7 @@ public class TurtleSmartItemModel implements BakedModel
                 Identifier overlay = turtle.getOverlay( stack );
                 boolean christmas = HolidayUtil.getCurrentHoliday() == Holiday.CHRISTMAS;
                 String label = turtle.getLabel( stack );
-                // TODO make upside down turtle items render properly (currently inivisible)
-                //boolean flip = label != null && (label.equals("Dinnerbone") || label.equals("Grumm"));
-                boolean flip = false;
+                boolean flip = label != null && (label.equals( "Dinnerbone" ) || label.equals( "Grumm" ));
                 TurtleModelCombination combo = new TurtleModelCombination( colour != -1, leftUpgrade, rightUpgrade, overlay, christmas, flip );
 
                 BakedModel model = cachedModels.get( combo );
@@ -143,12 +191,18 @@ public class TurtleSmartItemModel implements BakedModel
         return familyModel.isBuiltin();
     }
 
-    @Nonnull
     @Override
     @Deprecated
-    public Sprite getSprite()
+    public Sprite getParticleSprite()
     {
-        return familyModel.getSprite();
+        return familyModel.getParticleSprite();
+    }
+
+    @Nonnull
+    @Override
+    public ModelOverrideList getOverrides()
+    {
+        return overrides;
     }
 
     @Nonnull
@@ -159,63 +213,4 @@ public class TurtleSmartItemModel implements BakedModel
         return familyModel.getTransformation();
     }
 
-    @Nonnull
-    @Override
-    public ModelOverrideList getOverrides()
-    {
-        return overrides;
-    }
-
-    private static class TurtleModelCombination
-    {
-        final boolean colour;
-        final ITurtleUpgrade leftUpgrade;
-        final ITurtleUpgrade rightUpgrade;
-        final Identifier overlay;
-        final boolean christmas;
-        final boolean flip;
-
-        TurtleModelCombination( boolean colour, ITurtleUpgrade leftUpgrade, ITurtleUpgrade rightUpgrade, Identifier overlay, boolean christmas,
-                                boolean flip )
-        {
-            this.colour = colour;
-            this.leftUpgrade = leftUpgrade;
-            this.rightUpgrade = rightUpgrade;
-            this.overlay = overlay;
-            this.christmas = christmas;
-            this.flip = flip;
-        }
-
-        @Override
-        public int hashCode()
-        {
-            final int prime = 31;
-            int result = 0;
-            result = prime * result + (colour ? 1 : 0);
-            result = prime * result + (leftUpgrade != null ? leftUpgrade.hashCode() : 0);
-            result = prime * result + (rightUpgrade != null ? rightUpgrade.hashCode() : 0);
-            result = prime * result + (overlay != null ? overlay.hashCode() : 0);
-            result = prime * result + (christmas ? 1 : 0);
-            result = prime * result + (flip ? 1 : 0);
-            return result;
-        }
-
-        @Override
-        public boolean equals( Object other )
-        {
-            if( other == this )
-            {
-                return true;
-            }
-            if( !(other instanceof TurtleModelCombination) )
-            {
-                return false;
-            }
-
-            TurtleModelCombination otherCombo = (TurtleModelCombination) other;
-            return otherCombo.colour == colour && otherCombo.leftUpgrade == leftUpgrade && otherCombo.rightUpgrade == rightUpgrade && Objects.equal(
-                otherCombo.overlay, overlay ) && otherCombo.christmas == christmas && otherCombo.flip == flip;
-        }
-    }
-
 }

src/main/java/dan200/computercraft/core/apis/ComputerAccess.java

@@ -5,6 +5,7 @@
  */
 package dan200.computercraft.core.apis;
 
+import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.api.filesystem.IMount;
 import dan200.computercraft.api.filesystem.IWritableMount;
 import dan200.computercraft.api.peripheral.IComputerAccess;
@@ -30,6 +31,10 @@ public abstract class ComputerAccess implements IComputerAccess
     public void unmountAll()
     {
         FileSystem fileSystem = environment.getFileSystem();
+        if( !mounts.isEmpty() )
+        {
+            ComputerCraft.log.warn( "Peripheral or API called mount but did not call unmount for {}", mounts );
+        }
         for( String mount : mounts )
         {
             fileSystem.unmount( mount );

src/main/java/dan200/computercraft/core/apis/IAPIEnvironment.java

@@ -62,6 +62,7 @@ public interface IAPIEnvironment
     @Nullable
     IPeripheral getPeripheral( ComputerSide side );
 
+    @Nullable
     String getLabel();
 
     void setLabel( @Nullable String label );

src/main/java/dan200/computercraft/core/apis/handles/HandleGeneric.java

@@ -96,9 +96,8 @@ public abstract class HandleGeneric
 
     protected static SeekableByteChannel asSeekable( Channel channel )
     {
-        if( !(channel instanceof SeekableByteChannel) ) return null;
+        if( !(channel instanceof SeekableByteChannel seekable) ) return null;
 
-        SeekableByteChannel seekable = (SeekableByteChannel) channel;
         try
         {
             seekable.position( seekable.position() );

src/main/java/dan200/computercraft/core/apis/http/NetworkUtils.java

@@ -20,6 +20,8 @@ import io.netty.handler.codec.http.websocketx.WebSocketHandshakeException;
 import io.netty.handler.ssl.SslContext;
 import io.netty.handler.ssl.SslContextBuilder;
 import io.netty.handler.timeout.ReadTimeoutException;
+import io.netty.handler.traffic.AbstractTrafficShapingHandler;
+import io.netty.handler.traffic.GlobalTrafficShapingHandler;
 
 import javax.annotation.Nonnull;
 import javax.net.ssl.SSLException;
@@ -28,9 +30,7 @@ import javax.net.ssl.TrustManagerFactory;
 import java.net.InetSocketAddress;
 import java.net.URI;
 import java.security.KeyStore;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.SynchronousQueue;
-import java.util.concurrent.ThreadPoolExecutor;
+import java.util.concurrent.ScheduledThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 
 /**
@@ -38,10 +38,8 @@ import java.util.concurrent.TimeUnit;
  */
 public final class NetworkUtils
 {
-    public static final ExecutorService EXECUTOR = new ThreadPoolExecutor(
-        4, Integer.MAX_VALUE,
-        60L, TimeUnit.SECONDS,
-        new SynchronousQueue<>(),
+    public static final ScheduledThreadPoolExecutor EXECUTOR = new ScheduledThreadPoolExecutor(
+        4,
         ThreadUtils.builder( "Network" )
             .setPriority( Thread.MIN_PRIORITY + (Thread.NORM_PRIORITY - Thread.MIN_PRIORITY) / 2 )
             .build()
@@ -52,6 +50,15 @@ public final class NetworkUtils
         .build()
     );
 
+    public static final AbstractTrafficShapingHandler SHAPING_HANDLER = new GlobalTrafficShapingHandler(
+        EXECUTOR, ComputerCraft.httpUploadBandwidth, ComputerCraft.httpDownloadBandwidth
+    );
+
+    static
+    {
+        EXECUTOR.setKeepAliveTime( 60, TimeUnit.SECONDS );
+    }
+
     private NetworkUtils()
     {
     }
@@ -107,8 +114,18 @@ public final class NetworkUtils
         }
     }
 
+    public static void reloadConfig()
+    {
+        SHAPING_HANDLER.configure( ComputerCraft.httpUploadBandwidth, ComputerCraft.httpDownloadBandwidth );
+    }
+
+    public static void reset()
+    {
+        SHAPING_HANDLER.trafficCounter().resetCumulativeTime();
+    }
+
     /**
-     * Create a {@link InetSocketAddress} from a {@link URI}.
+     * Create a {@link InetSocketAddress} from a {@link java.net.URI}.
      *
      * Note, this may require a DNS lookup, and so should not be executed on the main CC thread.
      *
@@ -184,7 +201,7 @@ public final class NetworkUtils
         {
             return "Timed out";
         }
-        else if( cause instanceof SSLHandshakeException || (cause instanceof DecoderException && cause.getCause() instanceof SSLHandshakeException) )
+        else if( cause instanceof SSLHandshakeException || cause instanceof DecoderException && cause.getCause() instanceof SSLHandshakeException )
         {
             return "Could not create a secure connection";
         }

src/main/java/dan200/computercraft/core/apis/http/options/AddressRule.java

@@ -75,7 +75,7 @@ public final class AddressRule
         if( this.port != null && this.port != port ) return false;
         return predicate.matches( domain )
             || predicate.matches( address )
-            || (ipv4Address != null && predicate.matches( ipv4Address ));
+            || ipv4Address != null && predicate.matches( ipv4Address );
     }
 
     public static Options apply( Iterable<? extends AddressRule> rules, String domain, InetSocketAddress socketAddress )

src/main/java/dan200/computercraft/core/apis/http/request/HttpRequest.java

@@ -167,6 +167,7 @@ public class HttpRequest extends Resource<HttpRequest>
                         }
 
                         ChannelPipeline p = ch.pipeline();
+                        p.addLast( NetworkUtils.SHAPING_HANDLER );
                         if( sslContext != null )
                         {
                             p.addLast( sslContext.newHandler( ch.alloc(), uri.getHost(), socketAddress.getPort() ) );

src/main/java/dan200/computercraft/core/apis/http/request/HttpRequestHandler.java

@@ -100,9 +100,8 @@ public final class HttpRequestHandler extends SimpleChannelInboundHandler<HttpOb
     {
         if( closed || request.checkClosed() ) return;
 
-        if( message instanceof HttpResponse )
+        if( message instanceof HttpResponse response )
         {
-            HttpResponse response = (HttpResponse) message;
 
             if( request.redirects.get() > 0 )
             {
@@ -137,9 +136,8 @@ public final class HttpRequestHandler extends SimpleChannelInboundHandler<HttpOb
             responseHeaders.add( response.headers() );
         }
 
-        if( message instanceof HttpContent )
+        if( message instanceof HttpContent content )
         {
-            HttpContent content = (HttpContent) message;
 
             if( responseBody == null )
             {
@@ -162,9 +160,8 @@ public final class HttpRequestHandler extends SimpleChannelInboundHandler<HttpOb
                 responseBody.addComponent( true, partial.retain() );
             }
 
-            if( message instanceof LastHttpContent )
+            if( message instanceof LastHttpContent last )
             {
-                LastHttpContent last = (LastHttpContent) message;
                 responseHeaders.add( last.trailingHeaders() );
 
                 // Set the content length, if not already given.

src/main/java/dan200/computercraft/core/apis/http/websocket/Websocket.java

@@ -22,12 +22,12 @@ import io.netty.channel.ChannelPipeline;
 import io.netty.channel.socket.SocketChannel;
 import io.netty.channel.socket.nio.NioSocketChannel;
 import io.netty.handler.codec.http.HttpClientCodec;
+import io.netty.handler.codec.http.HttpHeaderNames;
 import io.netty.handler.codec.http.HttpHeaders;
 import io.netty.handler.codec.http.HttpObjectAggregator;
 import io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker;
 import io.netty.handler.codec.http.websocketx.WebSocketClientHandshakerFactory;
 import io.netty.handler.codec.http.websocketx.WebSocketVersion;
-import io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketClientCompressionHandler;
 import io.netty.handler.ssl.SslContext;
 
 import java.lang.ref.WeakReference;
@@ -145,20 +145,22 @@ public class Websocket extends Resource<Websocket>
                     protected void initChannel( SocketChannel ch )
                     {
                         ChannelPipeline p = ch.pipeline();
+                        p.addLast( NetworkUtils.SHAPING_HANDLER );
                         if( sslContext != null )
                         {
                             p.addLast( sslContext.newHandler( ch.alloc(), uri.getHost(), socketAddress.getPort() ) );
                         }
 
+                        String subprotocol = headers.get( HttpHeaderNames.SEC_WEBSOCKET_PROTOCOL );
                         WebSocketClientHandshaker handshaker = WebSocketClientHandshakerFactory.newHandshaker(
-                            uri, WebSocketVersion.V13, null, true, headers,
+                            uri, WebSocketVersion.V13, subprotocol, true, headers,
                             options.websocketMessage <= 0 ? MAX_MESSAGE_SIZE : options.websocketMessage
                         );
 
                         p.addLast(
                             new HttpClientCodec(),
                             new HttpObjectAggregator( 8192 ),
-                            WebSocketClientCompressionHandler.INSTANCE,
+                            WebsocketCompressionHandler.INSTANCE,
                             new WebsocketHandler( Websocket.this, handshaker, options )
                         );
                     }

src/main/java/dan200/computercraft/core/apis/http/websocket/WebsocketCompressionHandler.java

@@ -0,0 +1,38 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.core.apis.http.websocket;
+
+import io.netty.channel.ChannelHandler;
+import io.netty.handler.codec.compression.ZlibCodecFactory;
+import io.netty.handler.codec.http.websocketx.extensions.WebSocketClientExtensionHandler;
+import io.netty.handler.codec.http.websocketx.extensions.compression.DeflateFrameClientExtensionHandshaker;
+import io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker;
+import io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketClientCompressionHandler;
+
+import static io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker.MAX_WINDOW_SIZE;
+
+/**
+ * An alternative to {@link WebSocketClientCompressionHandler} which supports the {@literal client_no_context_takeover}
+ * extension. Makes CC <em>slightly</em> more flexible.
+ */
+@ChannelHandler.Sharable
+final class WebsocketCompressionHandler extends WebSocketClientExtensionHandler
+{
+    public static final WebsocketCompressionHandler INSTANCE = new WebsocketCompressionHandler();
+
+    private WebsocketCompressionHandler()
+    {
+        super(
+            new PerMessageDeflateClientExtensionHandshaker(
+                6, ZlibCodecFactory.isSupportingWindowSizeAndMemLevel(), MAX_WINDOW_SIZE,
+                true, false
+            ),
+            new DeflateFrameClientExtensionHandshaker( false ),
+            new DeflateFrameClientExtensionHandshaker( true )
+        );
+
+    }
+}

src/main/java/dan200/computercraft/core/apis/http/websocket/WebsocketHandler.java

@@ -55,9 +55,8 @@ public class WebsocketHandler extends SimpleChannelInboundHandler<Object>
             return;
         }
 
-        if( msg instanceof FullHttpResponse )
+        if( msg instanceof FullHttpResponse response )
         {
-            FullHttpResponse response = (FullHttpResponse) msg;
             throw new IllegalStateException( "Unexpected FullHttpResponse (getStatus=" + response.status() + ", content=" + response.content().toString( CharsetUtil.UTF_8 ) + ')' );
         }
 
@@ -76,9 +75,8 @@ public class WebsocketHandler extends SimpleChannelInboundHandler<Object>
             websocket.environment().addTrackingChange( TrackingField.WEBSOCKET_INCOMING, converted.length );
             websocket.environment().queueEvent( MESSAGE_EVENT, websocket.address(), converted, true );
         }
-        else if( frame instanceof CloseWebSocketFrame )
+        else if( frame instanceof CloseWebSocketFrame closeFrame )
         {
-            CloseWebSocketFrame closeFrame = (CloseWebSocketFrame) frame;
             websocket.close( closeFrame.statusCode(), closeFrame.reasonText() );
         }
         else if( frame instanceof PingWebSocketFrame )

src/main/java/dan200/computercraft/core/asm/Reflect.java

@@ -18,7 +18,7 @@ import static org.objectweb.asm.Opcodes.ICONST_0;
 
 final class Reflect
 {
-    static final Type OPTIONAL_IN = Optional.class.getTypeParameters()[0];
+    static final java.lang.reflect.Type OPTIONAL_IN = Optional.class.getTypeParameters()[0];
 
     private Reflect()
     {
@@ -52,12 +52,11 @@ final class Reflect
         {
             if( underlying instanceof Class<?> ) return (Class<?>) underlying;
 
-            if( underlying instanceof ParameterizedType )
+            if( underlying instanceof ParameterizedType type )
             {
-                ParameterizedType type = (ParameterizedType) underlying;
                 if( !allowParameter )
                 {
-                    for( Type arg : type.getActualTypeArguments() )
+                    for( java.lang.reflect.Type arg : type.getActualTypeArguments() )
                     {
                         if( arg instanceof WildcardType ) continue;
                         if( arg instanceof TypeVariable && ((TypeVariable<?>) arg).getName().startsWith( "capture#" ) )

src/main/java/dan200/computercraft/core/computer/Environment.java

@@ -309,9 +309,9 @@ public final class Environment implements IAPIEnvironment
         {
             int index = side.ordinal();
             IPeripheral existing = peripherals[index];
-            if( (existing == null && peripheral != null) ||
-                (existing != null && peripheral == null) ||
-                (existing != null && !existing.equals( peripheral )) )
+            if( existing == null && peripheral != null ||
+                existing != null && peripheral == null ||
+                existing != null && !existing.equals( peripheral ) )
             {
                 peripherals[index] = peripheral;
                 if( peripheralListener != null ) peripheralListener.onPeripheralChanged( side, peripheral );

src/main/java/dan200/computercraft/core/filesystem/MountWrapper.java

@@ -293,9 +293,8 @@ class MountWrapper
 
     private FileSystemException localExceptionOf( @Nullable String localPath, @Nonnull IOException e )
     {
-        if( !location.isEmpty() && e instanceof FileOperationException )
+        if( !location.isEmpty() && e instanceof FileOperationException ex )
         {
-            FileOperationException ex = (FileOperationException) e;
             if( ex.getFilename() != null ) return localExceptionOf( ex.getFilename(), ex.getMessage() );
         }
 

src/main/java/dan200/computercraft/core/filesystem/ResourceMount.java

@@ -16,10 +16,9 @@ import dan200.computercraft.shared.util.IoUtil;
 import net.minecraft.resource.ReloadableResourceManager;
 import net.minecraft.resource.Resource;
 import net.minecraft.resource.ResourceManager;
-import net.minecraft.resource.ResourceReloadListener;
+import net.minecraft.resource.SynchronousResourceReloader;
 import net.minecraft.util.Identifier;
 import net.minecraft.util.InvalidIdentifierException;
-import net.minecraft.util.profiler.Profiler;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
@@ -29,8 +28,6 @@ import java.io.InputStream;
 import java.nio.channels.Channels;
 import java.nio.channels.ReadableByteChannel;
 import java.util.*;
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.Executor;
 import java.util.concurrent.TimeUnit;
 
 public final class ResourceMount implements IMount
@@ -113,6 +110,7 @@ public final class ResourceMount implements IMount
             existingNamespace = file.getNamespace();
 
             if( !file.getNamespace().equals( namespace ) ) continue;
+            if( !FileSystem.contains( subPath, file.getPath() ) ) continue; // Some packs seem to include the parent?
 
             String localPath = FileSystem.toLocal( file.getPath(), subPath );
             create( newRoot, localPath );
@@ -294,12 +292,12 @@ public final class ResourceMount implements IMount
     }
 
     /**
-     * A {@link ResourceReloadListener} which reloads any associated mounts.
+     * A {@link ResourceReloader} which reloads any associated mounts.
      *
      * While people should really be keeping a permanent reference to this, some people construct it every
      * method call, so let's make this as small as possible.
      */
-    static class Listener implements ResourceReloadListener
+    static class Listener implements SynchronousResourceReloader
     {
         private static final Listener INSTANCE = new Listener();
 
@@ -307,24 +305,14 @@ public final class ResourceMount implements IMount
         private final Set<ReloadableResourceManager> managers = Collections.newSetFromMap( new WeakHashMap<>() );
 
         @Override
-        public CompletableFuture<Void> reload( Synchronizer synchronizer, ResourceManager manager, Profiler prepareProfiler, Profiler applyProfiler, Executor prepareExecutor, Executor applyExecutor )
+        public void reload( @Nonnull ResourceManager manager )
         {
-            return CompletableFuture.runAsync( () -> {
-                prepareProfiler.push( "Mount reloading" );
-                try
-                {
-                    for( ResourceMount mount : mounts ) mount.load();
-                }
-                finally
-                {
-                    prepareProfiler.pop();
-                }
-            }, prepareExecutor );
+            for( ResourceMount mount : mounts ) mount.load();
         }
 
         synchronized void add( ReloadableResourceManager manager, ResourceMount mount )
         {
-            if( managers.add( manager ) ) manager.registerListener( this );
+            if( managers.add( manager ) ) manager.registerReloader( this );
             mounts.add( mount );
         }
     }

src/main/java/dan200/computercraft/core/lua/CobaltLuaMachine.java

@@ -97,7 +97,7 @@ public class CobaltLuaMachine implements ILuaMachine
         globals.load( state, new CoroutineLib() );
         globals.load( state, new Bit32Lib() );
         globals.load( state, new Utf8Lib() );
-        if( ComputerCraft.debugEnable ) globals.load( state, new DebugLib() );
+        globals.load( state, new DebugLib() );
 
         // Remove globals we don't want to expose
         globals.rawset( "collectgarbage", Constants.NIL );
@@ -260,14 +260,12 @@ public class CobaltLuaMachine implements ILuaMachine
         if( object instanceof Number ) return valueOf( ((Number) object).doubleValue() );
         if( object instanceof Boolean ) return valueOf( (Boolean) object );
         if( object instanceof String ) return valueOf( object.toString() );
-        if( object instanceof byte[] )
+        if( object instanceof byte[] b )
         {
-            byte[] b = (byte[]) object;
             return valueOf( Arrays.copyOf( b, b.length ) );
         }
-        if( object instanceof ByteBuffer )
+        if( object instanceof ByteBuffer b )
         {
-            ByteBuffer b = (ByteBuffer) object;
             byte[] bytes = new byte[b.remaining()];
             b.get( bytes );
             return valueOf( bytes );
@@ -304,9 +302,8 @@ public class CobaltLuaMachine implements ILuaMachine
             return table;
         }
 
-        if( object instanceof Collection )
+        if( object instanceof Collection<?> objects )
         {
-            Collection<?> objects = (Collection<?>) object;
             LuaTable table = new LuaTable( objects.size(), 0 );
             values.put( object, table );
             int i = 0;
@@ -314,9 +311,8 @@ public class CobaltLuaMachine implements ILuaMachine
             return table;
         }
 
-        if( object instanceof Object[] )
+        if( object instanceof Object[] objects )
         {
-            Object[] objects = (Object[]) object;
             LuaTable table = new LuaTable( objects.length, 0 );
             values.put( object, table );
             for( int i = 0; i < objects.length; i++ ) table.rawset( i + 1, toValue( objects[i], values ) );
@@ -367,6 +363,7 @@ public class CobaltLuaMachine implements ILuaMachine
             case Constants.TSTRING:
                 return value.toString();
             case Constants.TTABLE:
+            {
                 // Table:
                 // Start remembering stuff
                 if( objects == null )
@@ -408,6 +405,7 @@ public class CobaltLuaMachine implements ILuaMachine
                     }
                 }
                 return table;
+            }
             default:
                 return null;
         }

src/main/java/dan200/computercraft/core/lua/LuaContext.java

@@ -9,6 +9,8 @@ import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.api.lua.ILuaContext;
 import dan200.computercraft.api.lua.ILuaTask;
 import dan200.computercraft.api.lua.LuaException;
+import dan200.computercraft.api.lua.MethodResult;
+import dan200.computercraft.core.asm.TaskCallback;
 import dan200.computercraft.core.computer.Computer;
 import dan200.computercraft.core.computer.MainThread;
 
@@ -66,4 +68,11 @@ class LuaContext implements ILuaContext
             throw new LuaException( "Task limit exceeded" );
         }
     }
+
+    @Nonnull
+    @Override
+    public MethodResult executeMainThreadTask( @Nonnull ILuaTask task ) throws LuaException
+    {
+        return TaskCallback.make( this, task );
+    }
 }

src/main/java/dan200/computercraft/core/terminal/Terminal.java

@@ -7,7 +7,7 @@ package dan200.computercraft.core.terminal;
 
 import dan200.computercraft.shared.util.Colour;
 import dan200.computercraft.shared.util.Palette;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.network.PacketByteBuf;
 
 import javax.annotation.Nonnull;
@@ -366,7 +366,7 @@ public class Terminal
         setChanged();
     }
 
-    public synchronized CompoundTag writeToNBT( CompoundTag nbt )
+    public synchronized NbtCompound writeToNBT( NbtCompound nbt )
     {
         nbt.putInt( "term_cursorX", cursorX );
         nbt.putInt( "term_cursorY", cursorY );
@@ -384,7 +384,7 @@ public class Terminal
         return nbt;
     }
 
-    public synchronized void readFromNBT( CompoundTag nbt )
+    public synchronized void readFromNBT( NbtCompound nbt )
     {
         cursorX = nbt.getInt( "term_cursorX" );
         cursorY = nbt.getInt( "term_cursorY" );
@@ -419,6 +419,7 @@ public class Terminal
     {
         if( c >= '0' && c <= '9' ) return c - '0';
         if( c >= 'a' && c <= 'f' ) return c - 'a' + 10;
+        if( c >= 'A' && c <= 'F' ) return c - 'A' + 10;
         return 15 - def.ordinal();
     }
 }

src/main/java/dan200/computercraft/core/terminal/TextBuffer.java

@@ -79,6 +79,7 @@ public class TextBuffer
         }
     }
 
+    @Override
     public String toString()
     {
         return new String( text );

src/main/java/dan200/computercraft/fabric/mixin/AffineTransformationAccess.java

@@ -1,25 +0,0 @@
-/*
- * This file is part of ComputerCraft - http://www.computercraft.info
- * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
- * Send enquiries to dratcliffe@gmail.com
- */
-package dan200.computercraft.fabric.mixin;
-
-import net.minecraft.client.util.math.AffineTransformation;
-import net.minecraft.client.util.math.Vector3f;
-import net.minecraft.util.math.Quaternion;
-import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.gen.Accessor;
-
-@Mixin( AffineTransformation.class )
-public interface AffineTransformationAccess
-{
-    @Accessor
-    Vector3f getTranslation();
-
-    @Accessor
-    Vector3f getScale();
-
-    @Accessor
-    Quaternion getRotation1();
-}

src/main/java/dan200/computercraft/fabric/mixin/BakedQuadAccess.java

@@ -1,18 +0,0 @@
-/*
- * This file is part of ComputerCraft - http://www.computercraft.info
- * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
- * Send enquiries to dratcliffe@gmail.com
- */
-package dan200.computercraft.fabric.mixin;
-
-import net.minecraft.client.render.model.BakedQuad;
-import net.minecraft.client.texture.Sprite;
-import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.gen.Accessor;
-
-@Mixin( BakedQuad.class )
-public interface BakedQuadAccess
-{
-    @Accessor
-    Sprite getSprite();
-}

src/main/java/dan200/computercraft/fabric/mixin/MixinBlock.java

@@ -7,13 +7,18 @@ package dan200.computercraft.fabric.mixin;
 
 import dan200.computercraft.shared.util.DropConsumer;
 import net.minecraft.block.Block;
+import net.minecraft.entity.ItemEntity;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
+
+import java.util.function.Supplier;
+
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+import org.spongepowered.asm.mixin.injection.callback.LocalCapture;
 
 /**
  * Captures block drops.
@@ -23,12 +28,16 @@ import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 @Mixin( Block.class )
 public class MixinBlock
 {
-    @Inject( method = "dropStack",
-        at = @At( value = "INVOKE", target = "Lnet/minecraft/world/World;spawnEntity(Lnet/minecraft/entity/Entity;)Z" ),
+    @Inject( method = "dropStack(Lnet/minecraft/world/World;Ljava/util/function/Supplier;Lnet/minecraft/item/ItemStack;)V",
+        at = @At(
+            value = "INVOKE",
+            target = "Lnet/minecraft/entity/ItemEntity;setToDefaultPickupDelay()V"
+        ),
+        locals = LocalCapture.CAPTURE_FAILSOFT,
         cancellable = true )
-    private static void dropStack( World world, BlockPos pos, ItemStack stack, CallbackInfo callbackInfo )
+    private static void dropStack( World world, Supplier<ItemEntity> itemEntitySupplier, ItemStack stack, CallbackInfo callbackInfo, ItemEntity itemEntity )
     {
-        if( DropConsumer.onHarvestDrops( world, pos, stack ) )
+        if( DropConsumer.onHarvestDrops( world, itemEntity.getBlockPos(), stack ) )
         {
             callbackInfo.cancel();
         }

src/main/java/dan200/computercraft/fabric/mixin/MixinGameRenderer.java

@@ -0,0 +1,43 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
+package dan200.computercraft.fabric.mixin;
+
+import com.mojang.datafixers.util.Pair;
+import dan200.computercraft.client.render.MonitorTextureBufferShader;
+import dan200.computercraft.client.render.RenderTypes;
+import net.minecraft.client.gl.Program;
+import net.minecraft.client.render.GameRenderer;
+import net.minecraft.client.render.Shader;
+import net.minecraft.resource.ResourceManager;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+import org.spongepowered.asm.mixin.injection.callback.LocalCapture;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.function.Consumer;
+
+@Mixin( GameRenderer.class )
+public class MixinGameRenderer
+{
+    @Inject( method = "loadShaders", at = @At( value = "INVOKE_ASSIGN", target = "Ljava/util/List;add(Ljava/lang/Object;)Z", ordinal = 53 ), locals = LocalCapture.CAPTURE_FAILSOFT )
+    private void loadShaders( ResourceManager manager, CallbackInfo info, List<Program> list, List<Pair<Shader, Consumer<Shader>>> list2 ) throws IOException
+    {
+        list2.add( Pair.of( new Shader(
+            manager,
+            "terminal",
+            RenderTypes.TERMINAL_WITHOUT_DEPTH.getVertexFormat()
+        ), shader -> RenderTypes.terminalShader = shader ) );
+        list2.add( Pair.of( new MonitorTextureBufferShader(
+            manager,
+            "monitor_tbo",
+            RenderTypes.MONITOR_TBO.getVertexFormat()
+        ), shader -> RenderTypes.monitorTboShader = (MonitorTextureBufferShader) shader ) );
+    }
+}

src/main/java/dan200/computercraft/fabric/mixin/MixinHandledScreen.java

@@ -0,0 +1,38 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.fabric.mixin;
+
+import dan200.computercraft.client.gui.widgets.WidgetTerminal;
+import net.minecraft.client.gui.Element;
+import net.minecraft.client.gui.screen.Screen;
+import net.minecraft.client.gui.screen.ingame.HandledScreen;
+import net.minecraft.screen.ScreenHandler;
+import net.minecraft.text.Text;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin( HandledScreen.class )
+public class MixinHandledScreen<T extends ScreenHandler> extends Screen
+{
+    protected MixinHandledScreen( Text title )
+    {
+        super( title );
+    }
+
+    @Inject( method = "mouseReleased", at = @At ( "HEAD" ) )
+    public void mouseReleased( double mouseX, double mouseY, int button, CallbackInfoReturnable<Boolean> cir )
+    {
+        for ( Element child : this.children() )
+        {
+            if ( child instanceof WidgetTerminal )
+            {
+                child.mouseReleased( mouseX, mouseY, button );
+            }
+        }
+    }
+}

src/main/java/dan200/computercraft/fabric/mixin/MixinItemFrameEntityRenderer.java

@@ -12,6 +12,7 @@ import net.fabricmc.api.Environment;
 import net.minecraft.client.render.VertexConsumerProvider;
 import net.minecraft.client.render.entity.ItemFrameEntityRenderer;
 import net.minecraft.client.util.math.MatrixStack;
+import net.minecraft.entity.EntityType;
 import net.minecraft.entity.decoration.ItemFrameEntity;
 import net.minecraft.item.ItemStack;
 import org.spongepowered.asm.mixin.Mixin;
@@ -23,16 +24,27 @@ import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 @Environment( EnvType.CLIENT )
 public class MixinItemFrameEntityRenderer
 {
-    @Inject( method = "render", at = @At( "HEAD" ), cancellable = true )
+    @Inject(
+        method = "render",
+        at = @At(
+            value = "INVOKE",
+            target = "Lnet/minecraft/client/util/math/MatrixStack;multiply(Lnet/minecraft/util/math/Quaternion;)V",
+            ordinal = 2,
+            shift = At.Shift.AFTER
+        ),
+        cancellable = true )
     private void renderItem(
         ItemFrameEntity itemFrameEntity, float f, float g, MatrixStack matrixStack,
-        VertexConsumerProvider vertexConsumerProvider, int i, CallbackInfo info
+        VertexConsumerProvider vertexConsumerProvider, int itemFrameEntityLight, CallbackInfo info
     )
     {
         ItemStack stack = itemFrameEntity.getHeldItemStack();
         if( stack.getItem() instanceof ItemPrintout )
         {
-            ItemPrintoutRenderer.INSTANCE.renderInFrame( matrixStack, vertexConsumerProvider, stack );
+            int light = itemFrameEntity.getType() == EntityType.GLOW_ITEM_FRAME ? 0xf000d2 : itemFrameEntityLight; // See getLightVal.
+            ItemPrintoutRenderer.INSTANCE.renderInFrame( matrixStack, vertexConsumerProvider, stack, light );
+            // TODO: need to find how to make if statement instead return, like it doing Forge
+            matrixStack.pop();
             info.cancel();
         }
     }

src/main/java/dan200/computercraft/fabric/mixin/MixinLanguage.java

@@ -0,0 +1,80 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
+package dan200.computercraft.fabric.mixin;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.gson.JsonParseException;
+import dan200.computercraft.shared.peripheral.generic.data.ItemData;
+import net.fabricmc.loader.api.FabricLoader;
+import net.minecraft.util.Language;
+import org.apache.logging.log4j.Logger;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+import org.spongepowered.asm.mixin.injection.callback.LocalCapture;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.BiConsumer;
+
+/**
+ * Loads all mods en_us lang file into the default Language instance on the dedicated server.
+ * Needed so that lua code running on the server can access the display name of items.
+ *
+ * @see ItemData#fill
+ */
+@Mixin( Language.class )
+public class MixinLanguage
+{
+    @Shadow
+    private static Logger LOGGER;
+
+    @Shadow
+    public static void load( InputStream inputStream, BiConsumer<String, String> entryConsumer )
+    {
+    }
+
+    private static void loadModLangFile( String modId, BiConsumer<String, String> biConsumer )
+    {
+        String path = "/assets/" + modId + "/lang/en_us.json";
+
+        try ( InputStream inputStream = Language.class.getResourceAsStream( path ) )
+        {
+            if ( inputStream == null ) return;
+            load( inputStream, biConsumer );
+        }
+        catch ( JsonParseException | IOException e )
+        {
+            LOGGER.error( "Couldn't read strings from " + path, e );
+        }
+    }
+
+    @Inject( method = "create", locals = LocalCapture.CAPTURE_FAILSOFT, at = @At( value = "INVOKE", remap = false, target = "Lcom/google/common/collect/ImmutableMap$Builder;build()Lcom/google/common/collect/ImmutableMap;" ) )
+    private static void create( CallbackInfoReturnable<Language> cir, ImmutableMap.Builder<String, String> builder )
+    {
+        final Map<String, String> originalTranslation = builder.build();
+        /*  We must ensure that the keys are de-duplicated because we can't catch the error that might otherwise
+         *  occur when the injected function calls build() on the ImmutableMap builder. So we use our own hash map and
+         *  exclude "minecraft", as the injected function has already loaded those keys at this point.
+         */
+        HashMap<String, String> translations = new HashMap<>();
+
+        FabricLoader.getInstance().getAllMods().stream().map( modContainer -> modContainer.getMetadata().getId() )
+            .filter( id -> !id.equals( "minecraft" ) ).forEach( id -> {
+                loadModLangFile( id, translations::put );
+            } );
+
+        // This is needed to remove keys that exist in vanilla Minecraft (Consistency+ does this)
+        translations.keySet().removeIf( originalTranslation::containsKey );
+
+        builder.putAll( translations );
+    }
+}

src/main/java/dan200/computercraft/fabric/mixin/MixinMatrix4f.java

@@ -0,0 +1,52 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.fabric.mixin;
+
+import dan200.computercraft.fabric.mixininterface.IMatrix4f;
+import net.minecraft.util.math.Matrix4f;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+
+@Mixin( Matrix4f.class )
+public class MixinMatrix4f implements IMatrix4f
+{
+    @Shadow protected float a00;
+    @Shadow protected float a01;
+    @Shadow protected float a02;
+    @Shadow protected float a03;
+    @Shadow protected float a10;
+    @Shadow protected float a11;
+    @Shadow protected float a12;
+    @Shadow protected float a13;
+    @Shadow protected float a20;
+    @Shadow protected float a21;
+    @Shadow protected float a22;
+    @Shadow protected float a23;
+    @Shadow protected float a30;
+    @Shadow protected float a31;
+    @Shadow protected float a32;
+    @Shadow protected float a33;
+
+    public void setFloatArray( float[] values )
+    {
+        a00 = values[0];
+        a01 = values[1];
+        a02 = values[2];
+        a03 = values[3];
+        a10 = values[4];
+        a11 = values[5];
+        a12 = values[6];
+        a13 = values[7];
+        a20 = values[8];
+        a21 = values[9];
+        a22 = values[10];
+        a23 = values[11];
+        a30 = values[12];
+        a31 = values[13];
+        a32 = values[14];
+        a33 = values[15];
+    }
+}

src/main/java/dan200/computercraft/fabric/mixin/MixinServerPlayerInteractionManager.java

@@ -34,7 +34,7 @@ public class MixinServerPlayerInteractionManager
             ActionResult actionResult = state.onUse( world, player, hand, hitResult );
             if( actionResult.isAccepted() )
             {
-                Criteria.ITEM_USED_ON_BLOCK.test( player, pos, stack );
+                Criteria.ITEM_USED_ON_BLOCK.trigger( player, pos, stack );
                 cir.setReturnValue( actionResult );
             }
         }

src/main/java/dan200/computercraft/fabric/mixin/MixinWorld.java

@@ -27,12 +27,18 @@ import java.util.Collection;
 public class MixinWorld
 {
     @Shadow
-    protected boolean iteratingTickingBlockEntities;
+    private boolean iteratingTickingBlockEntities;
 
-    @Inject( method = "setBlockEntity", at = @At( "HEAD" ) )
-    public void setBlockEntity( BlockPos pos, @Nullable BlockEntity entity, CallbackInfo info )
+    @Shadow
+    public boolean isInBuildLimit( BlockPos pos )
     {
-        if( !World.isOutOfBuildLimitVertically( pos ) && entity != null && !entity.isRemoved() && iteratingTickingBlockEntities )
+        return false;
+    }
+
+    @Inject( method = "addBlockEntity", at = @At( "HEAD" ) )
+    public void addBlockEntity( @Nullable BlockEntity entity, CallbackInfo info )
+    {
+        if( entity != null && !entity.isRemoved() && this.isInBuildLimit( entity.getPos() ) && iteratingTickingBlockEntities )
         {
             setWorld( entity, this );
         }
@@ -42,11 +48,11 @@ public class MixinWorld
     {
         if( entity.getWorld() != world && entity instanceof TileGeneric )
         {
-            entity.setLocation( (World) world, entity.getPos() );
+            entity.setWorld( (World) world );
         }
     }
 
-    @Inject( method = "addBlockEntities", at = @At( "HEAD" ) )
+    //    @Inject( method = "addBlockEntities", at = @At( "HEAD" ) )
     public void addBlockEntities( Collection<BlockEntity> entities, CallbackInfo info )
     {
         if( iteratingTickingBlockEntities )

src/main/java/dan200/computercraft/fabric/mixin/MusicDiscItemAccessor.java

@@ -1,18 +0,0 @@
-/*
- * This file is part of ComputerCraft - http://www.computercraft.info
- * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
- * Send enquiries to dratcliffe@gmail.com
- */
-package dan200.computercraft.fabric.mixin;
-
-import net.minecraft.item.MusicDiscItem;
-import net.minecraft.sound.SoundEvent;
-import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.gen.Accessor;
-
-@Mixin( MusicDiscItem.class )
-public interface MusicDiscItemAccessor
-{
-    @Accessor
-    SoundEvent getSound();
-}

src/main/java/dan200/computercraft/fabric/mixin/SignBlockEntityAccess.java

@@ -14,5 +14,5 @@ import org.spongepowered.asm.mixin.gen.Accessor;
 public interface SignBlockEntityAccess
 {
     @Accessor
-    Text[] getText();
+    Text[] getTexts();
 }

src/main/java/dan200/computercraft/fabric/mixin/SoundEventAccess.java

@@ -1,18 +0,0 @@
-/*
- * This file is part of ComputerCraft - http://www.computercraft.info
- * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
- * Send enquiries to dratcliffe@gmail.com
- */
-package dan200.computercraft.fabric.mixin;
-
-import net.minecraft.sound.SoundEvent;
-import net.minecraft.util.Identifier;
-import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.gen.Accessor;
-
-@Mixin( SoundEvent.class )
-public interface SoundEventAccess
-{
-    @Accessor
-    Identifier getId();
-}

src/main/java/dan200/computercraft/fabric/mixininterface/IMatrix4f.java

@@ -0,0 +1,11 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.fabric.mixininterface;
+
+public interface IMatrix4f
+{
+    void setFloatArray( float[] values );
+}

src/main/java/dan200/computercraft/shared/BundledRedstone.java

@@ -14,25 +14,24 @@ import net.minecraft.util.math.Direction;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
-import java.util.LinkedHashSet;
+import java.util.ArrayList;
 import java.util.Objects;
-import java.util.Set;
 
 public final class BundledRedstone
 {
-    private static final Set<IBundledRedstoneProvider> providers = new LinkedHashSet<>();
+    private static final ArrayList<IBundledRedstoneProvider> providers = new ArrayList<>();
 
     private BundledRedstone() {}
 
     public static synchronized void register( @Nonnull IBundledRedstoneProvider provider )
     {
         Objects.requireNonNull( provider, "provider cannot be null" );
-        providers.add( provider );
+        if( !providers.contains( provider ) ) providers.add( provider );
     }
 
     public static int getDefaultOutput( @Nonnull World world, @Nonnull BlockPos pos, @Nonnull Direction side )
     {
-        return World.isInBuildLimit( pos ) ? DefaultBundledRedstoneProvider.getDefaultBundledRedstoneOutput( world, pos, side ) : -1;
+        return world.isInBuildLimit( pos ) ? DefaultBundledRedstoneProvider.getDefaultBundledRedstoneOutput( world, pos, side ) : -1;
     }
 
     public static int getOutput( World world, BlockPos pos, Direction side )
@@ -43,7 +42,7 @@ public final class BundledRedstone
 
     private static int getUnmaskedOutput( World world, BlockPos pos, Direction side )
     {
-        if( !World.isInBuildLimit( pos ) )
+        if( !world.isInBuildLimit( pos ) )
         {
             return -1;
         }

src/main/java/dan200/computercraft/shared/ComputerCraftRegistry.java

@@ -13,12 +13,17 @@ import dan200.computercraft.shared.computer.blocks.BlockComputer;
 import dan200.computercraft.shared.computer.blocks.TileCommandComputer;
 import dan200.computercraft.shared.computer.blocks.TileComputer;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
-import dan200.computercraft.shared.computer.inventory.ContainerComputer;
+import dan200.computercraft.shared.computer.inventory.ComputerMenuWithoutInventory;
+import dan200.computercraft.shared.computer.inventory.ContainerComputerBase;
 import dan200.computercraft.shared.computer.inventory.ContainerViewComputer;
 import dan200.computercraft.shared.computer.items.ItemComputer;
 import dan200.computercraft.shared.media.items.ItemDisk;
 import dan200.computercraft.shared.media.items.ItemPrintout;
 import dan200.computercraft.shared.media.items.ItemTreasureDisk;
+import dan200.computercraft.shared.network.container.ComputerContainerData;
+import dan200.computercraft.shared.network.container.ContainerData;
+import dan200.computercraft.shared.network.container.HeldItemContainerData;
+import dan200.computercraft.shared.network.container.ViewComputerContainerData;
 import dan200.computercraft.shared.peripheral.diskdrive.BlockDiskDrive;
 import dan200.computercraft.shared.peripheral.diskdrive.ContainerDiskDrive;
 import dan200.computercraft.shared.peripheral.diskdrive.TileDiskDrive;
@@ -32,7 +37,6 @@ import dan200.computercraft.shared.peripheral.printer.ContainerPrinter;
 import dan200.computercraft.shared.peripheral.printer.TilePrinter;
 import dan200.computercraft.shared.peripheral.speaker.BlockSpeaker;
 import dan200.computercraft.shared.peripheral.speaker.TileSpeaker;
-import dan200.computercraft.shared.pocket.inventory.ContainerPocketComputer;
 import dan200.computercraft.shared.pocket.items.ItemPocketComputer;
 import dan200.computercraft.shared.pocket.peripherals.PocketModem;
 import dan200.computercraft.shared.pocket.peripherals.PocketSpeaker;
@@ -42,13 +46,11 @@ import dan200.computercraft.shared.turtle.core.TurtlePlayer;
 import dan200.computercraft.shared.turtle.inventory.ContainerTurtle;
 import dan200.computercraft.shared.turtle.items.ItemTurtle;
 import dan200.computercraft.shared.turtle.upgrades.*;
-import dan200.computercraft.shared.util.FixedPointTileEntityType;
 import net.fabricmc.fabric.api.object.builder.v1.block.FabricBlockSettings;
+import net.fabricmc.fabric.api.object.builder.v1.block.entity.FabricBlockEntityTypeBuilder;
 import net.fabricmc.fabric.api.screenhandler.v1.ScreenHandlerRegistry;
-import net.minecraft.block.AbstractBlock;
-import net.minecraft.block.Block;
-import net.minecraft.block.Blocks;
-import net.minecraft.block.Material;
+import net.fabricmc.fabric.api.tool.attribute.v1.FabricToolTags;
+import net.minecraft.block.*;
 import net.minecraft.block.entity.BlockEntity;
 import net.minecraft.block.entity.BlockEntityType;
 import net.minecraft.entity.EntityType;
@@ -61,12 +63,10 @@ import net.minecraft.screen.ScreenHandler;
 import net.minecraft.screen.ScreenHandlerType;
 import net.minecraft.sound.BlockSoundGroup;
 import net.minecraft.util.Identifier;
+import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.registry.Registry;
 
-import java.util.Objects;
 import java.util.function.BiFunction;
-import java.util.function.Function;
-import java.util.function.Supplier;
 
 import static net.minecraft.util.registry.Registry.BLOCK_ENTITY_TYPE;
 
@@ -91,32 +91,32 @@ public final class ComputerCraftRegistry
     public static final class ModBlocks
     {
         public static final BlockComputer COMPUTER_NORMAL = register( "computer_normal",
-            new BlockComputer( properties(), ComputerFamily.NORMAL, ModTiles.COMPUTER_NORMAL ) );
+            new BlockComputer( properties(), ComputerFamily.NORMAL, ComputerCraftRegistry.ModTiles.COMPUTER_NORMAL ) );
         public static final BlockComputer COMPUTER_ADVANCED = register( "computer_advanced",
             new BlockComputer( properties(),
                 ComputerFamily.ADVANCED,
-                ModTiles.COMPUTER_ADVANCED ) );
+                ComputerCraftRegistry.ModTiles.COMPUTER_ADVANCED ) );
         public static final BlockComputer COMPUTER_COMMAND = register( "computer_command",
             new BlockComputer( FabricBlockSettings.copyOf( Blocks.STONE )
                 .strength( -1, 6000000.0F ),
                 ComputerFamily.COMMAND,
-                ModTiles.COMPUTER_COMMAND ) );
+                ComputerCraftRegistry.ModTiles.COMPUTER_COMMAND ) );
         public static final BlockTurtle TURTLE_NORMAL = register( "turtle_normal",
-            new BlockTurtle( turtleProperties(), ComputerFamily.NORMAL, ModTiles.TURTLE_NORMAL ) );
+            new BlockTurtle( turtleProperties(), ComputerFamily.NORMAL, ComputerCraftRegistry.ModTiles.TURTLE_NORMAL ) );
         public static final BlockTurtle TURTLE_ADVANCED = register( "turtle_advanced",
-            new BlockTurtle( turtleProperties(), ComputerFamily.ADVANCED, ModTiles.TURTLE_ADVANCED ) );
+            new BlockTurtle( turtleProperties(), ComputerFamily.ADVANCED, ComputerCraftRegistry.ModTiles.TURTLE_ADVANCED ) );
         public static final BlockSpeaker SPEAKER = register( "speaker", new BlockSpeaker( properties() ) );
         public static final BlockDiskDrive DISK_DRIVE = register( "disk_drive", new BlockDiskDrive( properties() ) );
         public static final BlockPrinter PRINTER = register( "printer", new BlockPrinter( properties() ) );
-        public static final BlockMonitor MONITOR_NORMAL = register( "monitor_normal", new BlockMonitor( properties(), ModTiles.MONITOR_NORMAL ) );
-        public static final BlockMonitor MONITOR_ADVANCED = register( "monitor_advanced", new BlockMonitor( properties(), ModTiles.MONITOR_ADVANCED ) );
+        public static final BlockMonitor MONITOR_NORMAL = register( "monitor_normal", new BlockMonitor( properties(), ModTiles.MONITOR_NORMAL, false ) );
+        public static final BlockMonitor MONITOR_ADVANCED = register( "monitor_advanced", new BlockMonitor( properties(), ModTiles.MONITOR_ADVANCED, true ) );
         public static final BlockWirelessModem WIRELESS_MODEM_NORMAL = register( "wireless_modem_normal",
-            new BlockWirelessModem( properties(), ModTiles.WIRELESS_MODEM_NORMAL ) );
+            new BlockWirelessModem( properties(), ComputerCraftRegistry.ModTiles.WIRELESS_MODEM_NORMAL, ComputerFamily.NORMAL ) );
         public static final BlockWirelessModem WIRELESS_MODEM_ADVANCED = register( "wireless_modem_advanced",
-            new BlockWirelessModem( properties(), ModTiles.WIRELESS_MODEM_ADVANCED ) );
+            new BlockWirelessModem( properties(), ComputerCraftRegistry.ModTiles.WIRELESS_MODEM_ADVANCED, ComputerFamily.ADVANCED ) );
         public static final BlockWiredModemFull WIRED_MODEM_FULL = register( "wired_modem_full",
-            new BlockWiredModemFull( emProperties(), ModTiles.WIRED_MODEM_FULL ) );
-        public static final BlockCable CABLE = register( "cable", new BlockCable( emProperties() ) );
+            new BlockWiredModemFull( modemProperties(), ComputerCraftRegistry.ModTiles.WIRED_MODEM_FULL ) );
+        public static final BlockCable CABLE = register( "cable", new BlockCable( modemProperties() ) );
 
         private static Block.Settings properties()
         {
@@ -134,9 +134,11 @@ public final class ComputerCraftRegistry
                 .strength( 2.5f );
         }
 
-        private static Block.Settings emProperties()
+        private static Block.Settings modemProperties()
         {
             return FabricBlockSettings.copyOf( Blocks.STONE )
+                .breakByHand( true )
+                .breakByTool( FabricToolTags.PICKAXES )
                 .strength( 1.5f );
         }
 
@@ -149,46 +151,52 @@ public final class ComputerCraftRegistry
     public static class ModTiles
     {
 
-        public static final BlockEntityType<TileMonitor> MONITOR_NORMAL = ofBlock( () -> ModBlocks.MONITOR_NORMAL,
+        public static final BlockEntityType<TileMonitor> MONITOR_NORMAL = ofBlock( ModBlocks.MONITOR_NORMAL,
             "monitor_normal",
-            f -> new TileMonitor( f, false ) );
-        public static final BlockEntityType<TileMonitor> MONITOR_ADVANCED = ofBlock( () -> ModBlocks.MONITOR_ADVANCED,
+            ( blockPos, blockState ) -> new TileMonitor( ModTiles.MONITOR_NORMAL, false, blockPos, blockState ) );
+        public static final BlockEntityType<TileMonitor> MONITOR_ADVANCED = ofBlock( ModBlocks.MONITOR_ADVANCED,
             "monitor_advanced",
-            f -> new TileMonitor( f, true ) );
-        public static final BlockEntityType<TileComputer> COMPUTER_NORMAL = ofBlock( () -> ModBlocks.COMPUTER_NORMAL,
+            ( blockPos, blockState ) -> new TileMonitor( ModTiles.MONITOR_ADVANCED, true, blockPos, blockState ) );
+        public static final BlockEntityType<TileComputer> COMPUTER_NORMAL = ofBlock( ModBlocks.COMPUTER_NORMAL,
             "computer_normal",
-            f -> new TileComputer( ComputerFamily.NORMAL, f ) );
-        public static final BlockEntityType<TileComputer> COMPUTER_ADVANCED = ofBlock( () -> ModBlocks.COMPUTER_ADVANCED,
+            ( blockPos, blockState ) -> new TileComputer( ComputerFamily.NORMAL, ModTiles.COMPUTER_NORMAL, blockPos, blockState ) );
+        public static final BlockEntityType<TileComputer> COMPUTER_ADVANCED = ofBlock( ModBlocks.COMPUTER_ADVANCED,
             "computer_advanced",
-            f -> new TileComputer( ComputerFamily.ADVANCED, f ) );
-        public static final BlockEntityType<TileCommandComputer> COMPUTER_COMMAND = ofBlock( () -> ModBlocks.COMPUTER_COMMAND,
+            ( blockPos, blockState ) -> new TileComputer( ComputerFamily.ADVANCED, ModTiles.COMPUTER_ADVANCED, blockPos, blockState ) );
+        public static final BlockEntityType<TileCommandComputer> COMPUTER_COMMAND = ofBlock( ModBlocks.COMPUTER_COMMAND,
             "computer_command",
-            f -> new TileCommandComputer( ComputerFamily.COMMAND, f ) );
-        public static final BlockEntityType<TileTurtle> TURTLE_NORMAL = ofBlock( () -> ModBlocks.TURTLE_NORMAL,
+            ( blockPos, blockState ) -> new TileCommandComputer( ComputerFamily.COMMAND, ModTiles.COMPUTER_COMMAND, blockPos, blockState ) );
+        public static final BlockEntityType<TileTurtle> TURTLE_NORMAL = ofBlock( ModBlocks.TURTLE_NORMAL,
             "turtle_normal",
-            f -> new TileTurtle( f, ComputerFamily.NORMAL ) );
-        public static final BlockEntityType<TileTurtle> TURTLE_ADVANCED = ofBlock( () -> ModBlocks.TURTLE_ADVANCED,
+            ( blockPos, blockState ) -> new TileTurtle( ModTiles.TURTLE_NORMAL, blockPos, blockState, ComputerFamily.NORMAL ) );
+        public static final BlockEntityType<TileTurtle> TURTLE_ADVANCED = ofBlock( ModBlocks.TURTLE_ADVANCED,
             "turtle_advanced",
-            f -> new TileTurtle( f, ComputerFamily.ADVANCED ) );
-        public static final BlockEntityType<TileSpeaker> SPEAKER = ofBlock( () -> ModBlocks.SPEAKER, "speaker", TileSpeaker::new );
-        public static final BlockEntityType<TileDiskDrive> DISK_DRIVE = ofBlock( () -> ModBlocks.DISK_DRIVE, "disk_drive", TileDiskDrive::new );
-        public static final BlockEntityType<TilePrinter> PRINTER = ofBlock( () -> ModBlocks.PRINTER, "printer", TilePrinter::new );
-        public static final BlockEntityType<TileWiredModemFull> WIRED_MODEM_FULL = ofBlock( () -> ModBlocks.WIRED_MODEM_FULL,
+            ( blockPos, blockState ) -> new TileTurtle( ModTiles.TURTLE_ADVANCED, blockPos, blockState, ComputerFamily.ADVANCED ) );
+        public static final BlockEntityType<TileSpeaker> SPEAKER = ofBlock( ModBlocks.SPEAKER, "speaker",
+            ( blockPos, blockState ) -> new TileSpeaker( ModTiles.SPEAKER, blockPos, blockState ) );
+        public static final BlockEntityType<TileDiskDrive> DISK_DRIVE = ofBlock( ModBlocks.DISK_DRIVE, "disk_drive",
+            ( blockPos, blockState ) -> new TileDiskDrive( ModTiles.DISK_DRIVE, blockPos, blockState ) );
+        public static final BlockEntityType<TilePrinter> PRINTER = ofBlock( ModBlocks.PRINTER, "printer",
+            ( blockPos, blockState ) -> new TilePrinter( ModTiles.PRINTER, blockPos, blockState ) );
+        public static final BlockEntityType<TileWiredModemFull> WIRED_MODEM_FULL = ofBlock( ModBlocks.WIRED_MODEM_FULL,
             "wired_modem_full",
-            TileWiredModemFull::new );
-        public static final BlockEntityType<TileCable> CABLE = ofBlock( () -> ModBlocks.CABLE, "cable", TileCable::new );
-        public static final BlockEntityType<TileWirelessModem> WIRELESS_MODEM_NORMAL = ofBlock( () -> ModBlocks.WIRELESS_MODEM_NORMAL,
+            ( blockPos, blockState ) -> new TileWiredModemFull( ModTiles.WIRED_MODEM_FULL, blockPos, blockState ) );
+        public static final BlockEntityType<TileCable> CABLE = ofBlock( ModBlocks.CABLE, "cable",
+            ( blockPos, blockState ) -> new TileCable( ModTiles.CABLE, blockPos, blockState ) );
+        public static final BlockEntityType<TileWirelessModem> WIRELESS_MODEM_NORMAL = ofBlock( ModBlocks.WIRELESS_MODEM_NORMAL,
             "wireless_modem_normal",
-            f -> new TileWirelessModem( f, false ) );
-        public static final BlockEntityType<TileWirelessModem> WIRELESS_MODEM_ADVANCED = ofBlock( () -> ModBlocks.WIRELESS_MODEM_ADVANCED,
+            ( blockPos, blockState ) -> new TileWirelessModem( ModTiles.WIRELESS_MODEM_NORMAL, false, blockPos, blockState ) );
+        public static final BlockEntityType<TileWirelessModem> WIRELESS_MODEM_ADVANCED = ofBlock( ModBlocks.WIRELESS_MODEM_ADVANCED,
             "wireless_modem_advanced",
-            f -> new TileWirelessModem( f, true ) );
+            ( blockPos, blockState ) -> new TileWirelessModem( ModTiles.WIRELESS_MODEM_ADVANCED, true, blockPos, blockState ) );
 
-        private static <T extends BlockEntity> BlockEntityType<T> ofBlock( Supplier<Block> block, String id, Function<BlockEntityType<T>, T> factory )
+        private static <T extends BlockEntity> BlockEntityType<T> ofBlock( Block block, String id, BiFunction<BlockPos, BlockState, T> factory )
         {
+            BlockEntityType<T> blockEntityType = FabricBlockEntityTypeBuilder.create( factory::apply, block ).build();
             return Registry.register( BLOCK_ENTITY_TYPE,
                 new Identifier( MOD_ID, id ),
-                FixedPointTileEntityType.create( Objects.requireNonNull( block ), factory ) );
+                blockEntityType
+            );
         }
     }
 
@@ -252,24 +260,20 @@ public final class ComputerCraftRegistry
 
     public static class ModContainers
     {
-        public static final ScreenHandlerType<ContainerComputer> COMPUTER = registerExtended( "computer", ContainerComputer::new );
-        public static final ScreenHandlerType<ContainerPocketComputer> POCKET_COMPUTER = registerExtended( "pocket_computer", ContainerPocketComputer::new );
-        public static final ScreenHandlerType<ContainerTurtle> TURTLE = registerExtended( "turtle", ContainerTurtle::new );
+        public static final ScreenHandlerType<ContainerComputerBase> COMPUTER = ContainerData.toType( new Identifier( MOD_ID, "computer" ), ModContainers.COMPUTER, ComputerContainerData::new, ComputerMenuWithoutInventory::new );
+        public static final ScreenHandlerType<ContainerComputerBase> POCKET_COMPUTER = ContainerData.toType( new Identifier( MOD_ID, "pocket_computer" ), ModContainers.POCKET_COMPUTER, ComputerContainerData::new, ComputerMenuWithoutInventory::new );
+        public static final ScreenHandlerType<ContainerComputerBase> POCKET_COMPUTER_NO_TERM = ContainerData.toType( new Identifier( MOD_ID, "pocket_computer_no_term" ), ModContainers.POCKET_COMPUTER_NO_TERM, ComputerContainerData::new, ComputerMenuWithoutInventory::new );
+        public static final ScreenHandlerType<ContainerTurtle> TURTLE = ContainerData.toType( new Identifier( MOD_ID, "turtle" ), ComputerContainerData::new, ContainerTurtle::new );
         public static final ScreenHandlerType<ContainerDiskDrive> DISK_DRIVE = registerSimple( "disk_drive", ContainerDiskDrive::new );
         public static final ScreenHandlerType<ContainerPrinter> PRINTER = registerSimple( "printer", ContainerPrinter::new );
-        public static final ScreenHandlerType<ContainerHeldItem> PRINTOUT = registerExtended( "printout", ContainerHeldItem::createPrintout );
-        public static final ScreenHandlerType<ContainerViewComputer> VIEW_COMPUTER = registerExtended( "view_computer", ContainerViewComputer::new );
+        public static final ScreenHandlerType<ContainerHeldItem> PRINTOUT = ContainerData.toType( new Identifier( MOD_ID, "printout" ), HeldItemContainerData::new, ContainerHeldItem::createPrintout );
+        public static final ScreenHandlerType<ContainerViewComputer> VIEW_COMPUTER = ContainerData.toType( new Identifier( MOD_ID, "view_computer" ), ViewComputerContainerData::new, ContainerViewComputer::new );
 
         private static <T extends ScreenHandler> ScreenHandlerType<T> registerSimple( String id,
                                                                                       ScreenHandlerRegistry.SimpleClientHandlerFactory<T> function )
         {
             return ScreenHandlerRegistry.registerSimple( new Identifier( MOD_ID, id ), function );
         }
-
-        private static <T extends ScreenHandler> ScreenHandlerType<T> registerExtended( String id, ScreenHandlerRegistry.ExtendedClientHandlerFactory<T> function )
-        {
-            return ScreenHandlerRegistry.registerExtended( new Identifier( MOD_ID, id ), function );
-        }
     }
 
     public static final class TurtleUpgrades

src/main/java/dan200/computercraft/shared/Peripherals.java

@@ -35,7 +35,7 @@ public final class Peripherals
     @Nullable
     public static IPeripheral getPeripheral( World world, BlockPos pos, Direction side )
     {
-        return World.isInBuildLimit( pos ) && !world.isClient ? getPeripheralAt( world, pos, side ) : null;
+        return world.isInBuildLimit( pos ) && !world.isClient ? getPeripheralAt( world, pos, side ) : null;
     }
 
     @Nullable

src/main/java/dan200/computercraft/shared/TurtlePermissions.java

@@ -3,12 +3,8 @@
  * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
  * Send enquiries to dratcliffe@gmail.com
  */
-
 package dan200.computercraft.shared;
 
-import com.google.common.eventbus.Subscribe;
-import dan200.computercraft.ComputerCraft;
-import dan200.computercraft.api.turtle.event.TurtleActionEvent;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.world.ServerWorld;
@@ -17,23 +13,14 @@ import net.minecraft.world.World;
 
 public final class TurtlePermissions
 {
+    public static boolean isBlockEnterable( World world, BlockPos pos, PlayerEntity player )
+    {
+        MinecraftServer server = world.getServer();
+        return server == null || world.isClient || world instanceof ServerWorld && !server.isSpawnProtected( (ServerWorld) world, pos, player );
+    }
+
     public static boolean isBlockEditable( World world, BlockPos pos, PlayerEntity player )
     {
         return isBlockEnterable( world, pos, player );
     }
-
-    public static boolean isBlockEnterable( World world, BlockPos pos, PlayerEntity player )
-    {
-        MinecraftServer server = world.getServer();
-        return server == null || world.isClient || (world instanceof ServerWorld && !server.isSpawnProtected( (ServerWorld) world, pos, player ));
-    }
-
-    @Subscribe
-    public void onTurtleAction( TurtleActionEvent event )
-    {
-        if( ComputerCraft.turtleDisabledActions.contains( event.getAction() ) )
-        {
-            event.setCanceled( true, "Action has been disabled" );
-        }
-    }
 }

src/main/java/dan200/computercraft/shared/command/CommandComputerCraft.java

@@ -182,7 +182,7 @@ public final class CommandComputerCraft
                     ServerPlayerEntity player = (ServerPlayerEntity) entity;
                     if( player.getEntityWorld() == world )
                     {
-                        player.networkHandler.teleportRequest(
+                        player.networkHandler.requestTeleport(
                             pos.getX() + 0.5, pos.getY(), pos.getZ() + 0.5, 0, 0,
                             EnumSet.noneOf( PlayerPositionLookS2CPacket.Flag.class )
                         );
@@ -245,7 +245,7 @@ public final class CommandComputerCraft
                         @Override
                         public ScreenHandler createMenu( int id, @Nonnull PlayerInventory player, @Nonnull PlayerEntity entity )
                         {
-                            return new ContainerViewComputer( id, computer );
+                            return new ContainerViewComputer( id, player, computer );
                         }
                     } );
                     return 1;

src/main/java/dan200/computercraft/shared/command/UserLevel.java

@@ -56,18 +56,17 @@ public enum UserLevel implements Predicate<ServerCommandSource>
     public boolean test( ServerCommandSource source )
     {
         if( this == ANYONE ) return true;
-
-        if( this == OWNER || this == OWNER_OP )
-        {
-            MinecraftServer server = source.getMinecraftServer();
-            Entity sender = source.getEntity();
-            if( server.isSinglePlayer() && sender instanceof PlayerEntity &&
-                ((PlayerEntity) sender).getGameProfile().getName().equalsIgnoreCase( server.getServerModName() ) )
-            {
-                return true;
-            }
-        }
-
+        if( this == OWNER ) return isOwner( source );
+        if( this == OWNER_OP && isOwner( source ) ) return true;
         return source.hasPermissionLevel( toLevel() );
     }
+
+    private static boolean isOwner( ServerCommandSource source )
+    {
+        MinecraftServer server = source.getServer();
+        Entity sender = source.getEntity();
+        return server.isDedicated()
+            ? source.getEntity() == null && source.hasPermissionLevel( 4 ) && source.getName().equals( "Server" )
+            : sender instanceof PlayerEntity && ((PlayerEntity) sender).getGameProfile().getName().equalsIgnoreCase( server.getServerModName() );
+    }
 }

src/main/java/dan200/computercraft/shared/command/builder/HelpingArgumentBuilder.java

@@ -66,7 +66,7 @@ public final class HelpingArgumentBuilder extends LiteralArgumentBuilder<ServerC
         // An ugly hack to extract usage information from the dispatcher. We generate a temporary node, generate
         // the shorthand usage, and emit that.
         CommandDispatcher<ServerCommandSource> dispatcher = context.getSource()
-            .getMinecraftServer()
+            .getServer()
             .getCommandManager()
             .getDispatcher();
         CommandNode<ServerCommandSource> temp = new LiteralCommandNode<>( "_", null, x -> true, null, null, false );

src/main/java/dan200/computercraft/shared/common/BlockGeneric.java

@@ -18,7 +18,6 @@ import net.minecraft.util.ActionResult;
 import net.minecraft.util.Hand;
 import net.minecraft.util.hit.BlockHitResult;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.world.BlockView;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
@@ -35,6 +34,11 @@ public abstract class BlockGeneric extends BlockWithEntity
         this.type = type;
     }
 
+    public BlockEntityType<? extends TileGeneric> getType()
+    {
+        return type;
+    }
+
     @Override
     public BlockRenderType getRenderType( BlockState state )
     {
@@ -94,8 +98,12 @@ public abstract class BlockGeneric extends BlockWithEntity
 
     @Nullable
     @Override
-    public BlockEntity createBlockEntity( @Nonnull BlockView world )
+    public BlockEntity createBlockEntity( BlockPos pos, BlockState state )
     {
-        return type.instantiate();
+        if ( this.type != null )
+        {
+            return type.instantiate( pos, state );
+        }
+        return null;
     }
 }

src/main/java/dan200/computercraft/shared/common/ClientTerminal.java

@@ -8,7 +8,7 @@ package dan200.computercraft.shared.common;
 
 import dan200.computercraft.core.terminal.Terminal;
 import dan200.computercraft.shared.network.client.TerminalState;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 
 public class ClientTerminal implements ITerminal
 {
@@ -80,12 +80,12 @@ public class ClientTerminal implements ITerminal
         }
     }
 
-    public void readDescription( CompoundTag nbt )
+    public void readDescription( NbtCompound nbt )
     {
         colour = nbt.getBoolean( "colour" );
         if( nbt.contains( "terminal" ) )
         {
-            CompoundTag terminal = nbt.getCompound( "terminal" );
+            NbtCompound terminal = nbt.getCompound( "terminal" );
             resizeTerminal( terminal.getInt( "term_width" ), terminal.getInt( "term_height" ) );
             this.terminal.readFromNBT( terminal );
         }

src/main/java/dan200/computercraft/shared/common/ContainerHeldItem.java

@@ -36,11 +36,6 @@ public class ContainerHeldItem extends ScreenHandler
             .copy();
     }
 
-    public static ContainerHeldItem createPrintout( int id, PlayerInventory inventory, PacketByteBuf data )
-    {
-        return createPrintout( id, inventory, new HeldItemContainerData( data ) );
-    }
-
     public static ContainerHeldItem createPrintout( int id, PlayerInventory inventory, HeldItemContainerData data )
     {
         return new ContainerHeldItem( ComputerCraftRegistry.ModContainers.PRINTOUT, id, inventory.player, data.getHand() );

src/main/java/dan200/computercraft/shared/common/IColouredItem.java

@@ -7,7 +7,7 @@
 package dan200.computercraft.shared.common;
 
 import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 
 public interface IColouredItem
 {
@@ -20,7 +20,7 @@ public interface IColouredItem
 
     static int getColourBasic( ItemStack stack )
     {
-        CompoundTag tag = stack.getTag();
+        NbtCompound tag = stack.getNbt();
         return tag != null && tag.contains( NBT_COLOUR ) ? tag.getInt( NBT_COLOUR ) : -1;
     }
 
@@ -35,7 +35,7 @@ public interface IColouredItem
     {
         if( colour == -1 )
         {
-            CompoundTag tag = stack.getTag();
+            NbtCompound tag = stack.getNbt();
             if( tag != null )
             {
                 tag.remove( NBT_COLOUR );
@@ -43,7 +43,7 @@ public interface IColouredItem
         }
         else
         {
-            stack.getOrCreateTag()
+            stack.getOrCreateNbt()
                 .putInt( NBT_COLOUR, colour );
         }
     }

src/main/java/dan200/computercraft/shared/common/ServerTerminal.java

@@ -8,7 +8,7 @@ package dan200.computercraft.shared.common;
 
 import dan200.computercraft.core.terminal.Terminal;
 import dan200.computercraft.shared.network.client.TerminalState;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 
 import java.util.concurrent.atomic.AtomicBoolean;
 
@@ -85,12 +85,12 @@ public class ServerTerminal implements ITerminal
         return new TerminalState( colour, terminal );
     }
 
-    public void writeDescription( CompoundTag nbt )
+    public void writeDescription( NbtCompound nbt )
     {
         nbt.putBoolean( "colour", colour );
         if( terminal != null )
         {
-            CompoundTag terminal = new CompoundTag();
+            NbtCompound terminal = new NbtCompound();
             terminal.putInt( "term_width", this.terminal.getWidth() );
             terminal.putInt( "term_height", this.terminal.getHeight() );
             this.terminal.writeToNBT( terminal );

src/main/java/dan200/computercraft/shared/common/TileGeneric.java

@@ -11,7 +11,7 @@ import net.minecraft.block.BlockState;
 import net.minecraft.block.entity.BlockEntity;
 import net.minecraft.block.entity.BlockEntityType;
 import net.minecraft.entity.player.PlayerEntity;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.util.ActionResult;
 import net.minecraft.util.Hand;
 import net.minecraft.util.hit.BlockHitResult;
@@ -21,9 +21,9 @@ import javax.annotation.Nonnull;
 
 public abstract class TileGeneric extends BlockEntity implements BlockEntityClientSerializable
 {
-    public TileGeneric( BlockEntityType<? extends TileGeneric> type )
+    public TileGeneric( BlockEntityType<? extends TileGeneric> type, BlockPos pos, BlockState state )
     {
-        super( type );
+        super( type, pos, state );
     }
 
     public void destroy()
@@ -82,23 +82,23 @@ public abstract class TileGeneric extends BlockEntity implements BlockEntityClie
     }
 
     @Override
-    public void fromClientTag( CompoundTag compoundTag )
+    public void fromClientTag( NbtCompound compoundTag )
     {
         readDescription( compoundTag );
     }
 
-    protected void readDescription( @Nonnull CompoundTag nbt )
+    protected void readDescription( @Nonnull NbtCompound nbt )
     {
     }
 
     @Override
-    public CompoundTag toClientTag( CompoundTag compoundTag )
+    public NbtCompound toClientTag( NbtCompound compoundTag )
     {
         writeDescription( compoundTag );
         return compoundTag;
     }
 
-    protected void writeDescription( @Nonnull CompoundTag nbt )
+    protected void writeDescription( @Nonnull NbtCompound nbt )
     {
     }
 }

src/main/java/dan200/computercraft/shared/computer/apis/CommandAPI.java

@@ -16,7 +16,7 @@ import dan200.computercraft.shared.util.NBTUtil;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.entity.BlockEntity;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.command.CommandManager;
 import net.minecraft.server.command.ServerCommandSource;
@@ -204,7 +204,7 @@ public class CommandAPI implements ILuaAPI
         World world = computer.getWorld();
         BlockPos min = new BlockPos( Math.min( minX, maxX ), Math.min( minY, maxY ), Math.min( minZ, maxZ ) );
         BlockPos max = new BlockPos( Math.max( minX, maxX ), Math.max( minY, maxY ), Math.max( minZ, maxZ ) );
-        if( !World.isInBuildLimit( min ) || !World.isInBuildLimit( max ) )
+        if( !world.isInBuildLimit( min ) || !world.isInBuildLimit( max ) )
         {
             throw new LuaException( "Co-ordinates out of range" );
         }
@@ -252,7 +252,7 @@ public class CommandAPI implements ILuaAPI
         BlockEntity tile = world.getBlockEntity( pos );
         if( tile != null )
         {
-            table.put( "nbt", NBTUtil.toLua( tile.toTag( new CompoundTag() ) ) );
+            table.put( "nbt", NBTUtil.toLua( tile.writeNbt( new NbtCompound() ) ) );
         }
 
         return table;
@@ -289,7 +289,7 @@ public class CommandAPI implements ILuaAPI
         // Get the details of the block
         World world = computer.getWorld();
         BlockPos position = new BlockPos( x, y, z );
-        if( World.isInBuildLimit( position ) )
+        if( world.isInBuildLimit( position ) )
         {
             return getBlockInfo( world, position );
         }