Pass lightmap variables around various renderers

- Add lightmap parameters to the text, computer and printout renderers.

 - Printouts are always rendered using the current lightmap. When
   interacting with the GUI, we use the fullbright lightmap coordinate.

 - Pocket computers render their border using the lightmap. Terminal and
   light do not use the lightmap at all.

There's some funkiness going on here with render types - it appears the
"correct" position_color_tex_lightmap render type is actually one used
for text.

Fixes #919. This bug does occur on 1.16 too, but given how complex the
rendering changes are between 1.16 and 1.17 I do /not/ want to have to
implement this twice. Sorry.

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

@@ -5,6 +5,7 @@
  */
 package dan200.computercraft.client.gui;
 
+import com.mojang.blaze3d.vertex.Tesselator;
 import com.mojang.blaze3d.vertex.VertexConsumer;
 import com.mojang.math.Matrix4f;
 import dan200.computercraft.client.FrameInfo;
@@ -13,18 +14,32 @@ 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.Minecraft;
 import net.minecraft.client.renderer.MultiBufferSource;
-import net.minecraft.client.renderer.RenderType;
 import net.minecraft.resources.ResourceLocation;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
+import static dan200.computercraft.client.render.RenderTypes.FULL_BRIGHT_LIGHTMAP;
+
+/**
+ * Handles rendering fixed width text and computer terminals.
+ *
+ * This class has several modes of usage:
+ * <ul>
+ * <li>{@link #drawString}: Drawing basic text without a terminal (such as for printouts). Unlike the other methods,
+ * this accepts a lightmap coordinate as, unlike terminals, printed pages render fullbright.</li>
+ * <li>{@link #drawTerminalWithoutCursor}/{@link #drawCursor}: Draw a terminal without a cursor and then draw the cursor
+ * separately. This is used by the monitor renderer to render the terminal to a VBO and draw the cursor dynamically.
+ * </li>
+ * <li>{@link #drawTerminal}: Draw a terminal with a cursor. This is used by the various computer GUIs to render the
+ * whole term.</li>
+ * <li>{@link #drawBlocker}: When rendering a terminal using {@link RenderTypes#TERMINAL_WITHOUT_DEPTH} you need to
+ * render an additional "depth blocker" on top of the monitor.</li>
+ * </ul>
+ */
 public final class FixedWidthFontRenderer
 {
-    private static final RenderType TYPE = RenderTypes.TERMINAL_WITH_DEPTH;
-
     public static final ResourceLocation FONT = new ResourceLocation( "computercraft", "textures/gui/term_font.png" );
 
     public static final int FONT_HEIGHT = 9;
@@ -48,7 +63,7 @@ public final class FixedWidthFontRenderer
         return 15 - Terminal.getColour( c, def );
     }
 
-    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 == ' ' ) return;
@@ -59,12 +74,12 @@ public final class FixedWidthFontRenderer
         int xStart = 1 + column * (FONT_WIDTH + 2);
         int yStart = 1 + row * (FONT_HEIGHT + 2);
 
-        buffer.vertex( transform, x, y, 0f ).color( r, g, b, 1.0f ).uv( xStart / WIDTH, yStart / WIDTH ).endVertex();
+        buffer.vertex( transform, x, y, 0f ).color( r, g, b, 1.0f ).uv( xStart / WIDTH, yStart / WIDTH ).uv2( light ).endVertex();
-        buffer.vertex( transform, x, y + FONT_HEIGHT, 0f ).color( r, g, b, 1.0f ).uv( xStart / WIDTH, (yStart + FONT_HEIGHT) / WIDTH ).endVertex();
+        buffer.vertex( transform, x, y + FONT_HEIGHT, 0f ).color( r, g, b, 1.0f ).uv( xStart / WIDTH, (yStart + FONT_HEIGHT) / WIDTH ).uv2( light ).endVertex();
-        buffer.vertex( transform, x + FONT_WIDTH, y, 0f ).color( r, g, b, 1.0f ).uv( (xStart + FONT_WIDTH) / WIDTH, yStart / WIDTH ).endVertex();
+        buffer.vertex( transform, x + FONT_WIDTH, y, 0f ).color( r, g, b, 1.0f ).uv( (xStart + FONT_WIDTH) / WIDTH, yStart / WIDTH ).uv2( light ).endVertex();
-        buffer.vertex( transform, x + FONT_WIDTH, y, 0f ).color( r, g, b, 1.0f ).uv( (xStart + FONT_WIDTH) / WIDTH, yStart / WIDTH ).endVertex();
+        buffer.vertex( transform, x + FONT_WIDTH, y, 0f ).color( r, g, b, 1.0f ).uv( (xStart + FONT_WIDTH) / WIDTH, yStart / WIDTH ).uv2( light ).endVertex();
-        buffer.vertex( transform, x, y + FONT_HEIGHT, 0f ).color( r, g, b, 1.0f ).uv( xStart / WIDTH, (yStart + FONT_HEIGHT) / WIDTH ).endVertex();
+        buffer.vertex( transform, x, y + FONT_HEIGHT, 0f ).color( r, g, b, 1.0f ).uv( xStart / WIDTH, (yStart + FONT_HEIGHT) / WIDTH ).uv2( light ).endVertex();
-        buffer.vertex( transform, x + FONT_WIDTH, y + FONT_HEIGHT, 0f ).color( r, g, b, 1.0f ).uv( (xStart + FONT_WIDTH) / WIDTH, (yStart + FONT_HEIGHT) / WIDTH ).endVertex();
+        buffer.vertex( transform, x + FONT_WIDTH, y + FONT_HEIGHT, 0f ).color( r, g, b, 1.0f ).uv( (xStart + FONT_WIDTH) / WIDTH, (yStart + FONT_HEIGHT) / WIDTH ).uv2( light ).endVertex();
     }
 
     private static void drawQuad( Matrix4f transform, VertexConsumer buffer, float x, float y, float width, float height, float r, float g, float b )
@@ -137,7 +152,7 @@ public final class FixedWidthFontRenderer
     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
+        @Nonnull Palette palette, boolean greyscale, float leftMarginSize, float rightMarginSize, int light
     )
     {
         if( backgroundColour != null )
@@ -163,7 +178,7 @@ public final class FixedWidthFontRenderer
             // Draw char
             int index = text.charAt( i );
             if( index > 255 ) 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 );
         }
 
     }
@@ -196,7 +211,7 @@ public final class FixedWidthFontRenderer
             drawString(
                 transform, buffer, x, y + FixedWidthFontRenderer.FONT_HEIGHT * i,
                 terminal.getLine( i ), terminal.getTextColourLine( i ), terminal.getBackgroundColourLine( i ),
-                palette, greyscale, leftMarginSize, rightMarginSize
+                palette, greyscale, leftMarginSize, rightMarginSize, FULL_BRIGHT_LIGHTMAP
             );
         }
     }
@@ -227,7 +242,7 @@ 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 );
         }
     }
 
@@ -246,10 +261,10 @@ public final class FixedWidthFontRenderer
         float topMarginSize, float bottomMarginSize, float leftMarginSize, float rightMarginSize
     )
     {
-        MultiBufferSource.BufferSource renderer = Minecraft.getInstance().renderBuffers().bufferSource();
+        MultiBufferSource.BufferSource renderer = MultiBufferSource.immediate( Tesselator.getInstance().getBuilder() );
         VertexConsumer buffer = renderer.getBuffer( RenderTypes.TERMINAL_WITH_DEPTH );
         drawTerminal( transform, buffer, x, y, terminal, greyscale, topMarginSize, bottomMarginSize, leftMarginSize, rightMarginSize );
-        renderer.endBatch( RenderTypes.TERMINAL_WITH_DEPTH );
+        renderer.endBatch();
     }
 
     public static void drawEmptyTerminal( @Nonnull Matrix4f transform, @Nonnull MultiBufferSource renderer, float x, float y, float width, float height )
@@ -260,7 +275,7 @@ public final class FixedWidthFontRenderer
 
     public static void drawEmptyTerminal( @Nonnull Matrix4f transform, float x, float y, float width, float height )
     {
-        MultiBufferSource.BufferSource renderer = Minecraft.getInstance().renderBuffers().bufferSource();
+        MultiBufferSource.BufferSource renderer = MultiBufferSource.immediate( Tesselator.getInstance().getBuilder() );
         drawEmptyTerminal( transform, renderer, x, y, width, height );
         renderer.endBatch();
     }

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

@@ -5,12 +5,12 @@
  */
 package dan200.computercraft.client.gui;
 
-import com.mojang.blaze3d.systems.RenderSystem;
 import com.mojang.blaze3d.vertex.PoseStack;
 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.client.render.RenderTypes;
 import dan200.computercraft.shared.computer.inventory.ContainerComputerBase;
 import dan200.computercraft.shared.computer.inventory.ContainerViewComputer;
 import net.minecraft.network.chat.Component;
@@ -76,9 +76,10 @@ public final class GuiComputer<T extends ContainerComputerBase> extends Computer
     public void renderBg( @Nonnull PoseStack stack, float partialTicks, int mouseX, int mouseY )
     {
         // Draw a border around the terminal
-        RenderSystem.setShaderColor( 1, 1, 1, 1 );
+        ComputerBorderRenderer.render(
-        RenderSystem.setShaderTexture( 0, ComputerBorderRenderer.getTexture( family ) );
+            ComputerBorderRenderer.getTexture( family ), terminal.x, terminal.y, getBlitOffset(),
-        ComputerBorderRenderer.render( terminal.x, terminal.y, getBlitOffset(), terminal.getWidth(), terminal.getHeight() );
+            RenderTypes.FULL_BRIGHT_LIGHTMAP, terminal.getWidth(), terminal.getHeight()
+        );
         ComputerSidebar.renderBackground( stack, leftPos, topPos + sidebarYOffset );
     }
 }

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

@@ -7,11 +7,11 @@ package dan200.computercraft.client.gui;
 
 import com.mojang.blaze3d.systems.RenderSystem;
 import com.mojang.blaze3d.vertex.PoseStack;
+import com.mojang.blaze3d.vertex.Tesselator;
 import com.mojang.math.Matrix4f;
 import dan200.computercraft.core.terminal.TextBuffer;
 import dan200.computercraft.shared.common.ContainerHeldItem;
 import dan200.computercraft.shared.media.items.ItemPrintout;
-import net.minecraft.client.Minecraft;
 import net.minecraft.client.gui.screens.inventory.AbstractContainerScreen;
 import net.minecraft.client.renderer.MultiBufferSource;
 import net.minecraft.network.chat.Component;
@@ -21,6 +21,7 @@ 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 AbstractContainerScreen<ContainerHeldItem>
 {
@@ -97,10 +98,10 @@ public class GuiPrintout extends AbstractContainerScreen<ContainerHeldItem>
         RenderSystem.setShaderColor( 1.0f, 1.0f, 1.0f, 1.0f );
         RenderSystem.enableDepthTest();
 
-        MultiBufferSource.BufferSource renderer = Minecraft.getInstance().renderBuffers().bufferSource();
+        MultiBufferSource.BufferSource renderer = MultiBufferSource.immediate( Tesselator.getInstance().getBuilder() );
         Matrix4f matrix = transform.last().pose();
-        drawBorder( matrix, renderer, leftPos, topPos, getBlitOffset(), page, pages, book );
+        drawBorder( matrix, renderer, leftPos, topPos, getBlitOffset(), page, pages, book, FULL_BRIGHT_LIGHTMAP );
-        drawText( matrix, renderer, leftPos + X_TEXT_MARGIN, topPos + Y_TEXT_MARGIN, ItemPrintout.LINES_PER_PAGE * page, text, colours );
+        drawText( matrix, renderer, leftPos + X_TEXT_MARGIN, topPos + Y_TEXT_MARGIN, ItemPrintout.LINES_PER_PAGE * page, FULL_BRIGHT_LIGHTMAP, text, colours );
         renderer.endBatch();
     }
 

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

@@ -5,12 +5,13 @@
  */
 package dan200.computercraft.client.render;
 
-import com.mojang.blaze3d.systems.RenderSystem;
+import com.mojang.blaze3d.vertex.Tesselator;
-import com.mojang.blaze3d.vertex.*;
+import com.mojang.blaze3d.vertex.VertexConsumer;
 import com.mojang.math.Matrix4f;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.computer.core.ComputerFamily;
-import net.minecraft.client.renderer.GameRenderer;
+import net.minecraft.client.renderer.MultiBufferSource;
+import net.minecraft.client.renderer.RenderType;
 import net.minecraft.resources.ResourceLocation;
 
 import javax.annotation.Nonnull;
@@ -54,14 +55,16 @@ public class ComputerBorderRenderer
 
     private final Matrix4f transform;
     private final VertexConsumer builder;
+    private final int light;
     private final int z;
     private final float r, g, b;
 
-    public ComputerBorderRenderer( Matrix4f transform, VertexConsumer builder, int z, float r, float g, float b )
+    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;
@@ -83,32 +86,22 @@ public class ComputerBorderRenderer
         }
     }
 
-    public static void render( int x, int y, int z, int width, int height )
+    public static RenderType getRenderType( ResourceLocation location )
     {
-        RenderSystem.setShader( GameRenderer::getPositionColorTexShader );
+        // See note in RenderTypes about why we use text rather than anything intuitive.
-        Tesselator tessellator = Tesselator.getInstance();
+        return RenderType.text( location );
-        BufferBuilder buffer = tessellator.getBuilder();
-        buffer.begin( VertexFormat.Mode.QUADS, DefaultVertexFormat.POSITION_COLOR_TEX );
-
-        render( IDENTITY, buffer, x, y, z, width, height );
-
-        // TODO: RenderSystem.enableAlphaTest();
-        tessellator.end();
     }
 
-    public static void render( Matrix4f transform, VertexConsumer buffer, int x, int y, int z, int width, int height )
+    public static void render( ResourceLocation location, int x, int y, int z, int light, int width, int height )
     {
-        render( transform, buffer, x, y, z, width, height, 1, 1, 1 );
+        MultiBufferSource.BufferSource source = MultiBufferSource.immediate( Tesselator.getInstance().getBuilder() );
+        render( IDENTITY, source.getBuffer( getRenderType( location ) ), x, y, z, light, width, height, false, 1, 1, 1 );
+        source.endBatch();
     }
 
-    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 );
+        new ComputerBorderRenderer( transform, buffer, z, light, r, g, b ).doRender( x, y, width, height, withLight );
-    }
-
-    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 );
     }
 
     public void doRender( int x, int y, int width, int height, boolean withLight )
@@ -158,9 +151,9 @@ public class ComputerBorderRenderer
 
     private void renderTexture( int x, int y, int u, int v, int width, int height, int textureWidth, int textureHeight )
     {
-        builder.vertex( transform, x, y + height, z ).color( r, g, b, 1.0f ).uv( u * TEX_SCALE, (v + textureHeight) * TEX_SCALE ).endVertex();
+        builder.vertex( transform, x, y + height, z ).color( r, g, b, 1.0f ).uv( u * TEX_SCALE, (v + textureHeight) * TEX_SCALE ).uv2( light ).endVertex();
-        builder.vertex( transform, x + width, y + height, z ).color( r, g, b, 1.0f ).uv( (u + textureWidth) * TEX_SCALE, (v + textureHeight) * TEX_SCALE ).endVertex();
+        builder.vertex( transform, x + width, y + height, z ).color( r, g, b, 1.0f ).uv( (u + textureWidth) * TEX_SCALE, (v + textureHeight) * TEX_SCALE ).uv2( light ).endVertex();
-        builder.vertex( transform, x + width, y, z ).color( r, g, b, 1.0f ).uv( (u + textureWidth) * TEX_SCALE, v * TEX_SCALE ).endVertex();
+        builder.vertex( transform, x + width, y, z ).color( r, g, b, 1.0f ).uv( (u + textureWidth) * TEX_SCALE, v * TEX_SCALE ).uv2( light ).endVertex();
-        builder.vertex( transform, x, y, z ).color( r, g, b, 1.0f ).uv( u * TEX_SCALE, v * TEX_SCALE ).endVertex();
+        builder.vertex( transform, x, y, z ).color( r, g, b, 1.0f ).uv( u * TEX_SCALE, v * TEX_SCALE ).uv2( light ).endVertex();
     }
 }

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

@@ -26,9 +26,10 @@ 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     The packed lightmap coordinates.
      * @see ItemInHandRenderer#renderItem(LivingEntity, ItemStack, ItemTransforms.TransformType, boolean, PoseStack, MultiBufferSource, int)
      */
-    protected abstract void renderItem( PoseStack transform, MultiBufferSource render, ItemStack stack );
+    protected abstract void renderItem( PoseStack transform, MultiBufferSource render, ItemStack stack, int light );
 
     protected void renderItemFirstPerson( PoseStack transform, MultiBufferSource render, int lightTexture, InteractionHand hand, float pitch, float equipProgress, float swingProgress, ItemStack stack )
     {
@@ -90,7 +91,7 @@ public abstract class ItemMapLikeRenderer
         transform.mulPose( Vector3f.XP.rotationDegrees( f2 * -45f ) );
         transform.mulPose( Vector3f.YP.rotationDegrees( offset * f2 * -30f ) );
 
-        renderItem( transform, render, stack );
+        renderItem( transform, render, stack, combinedLight );
 
         transform.popPose();
     }
@@ -135,6 +136,6 @@ public abstract class ItemMapLikeRenderer
         transform.mulPose( Vector3f.XP.rotationDegrees( rX * 20.0F ) );
         transform.scale( 2.0F, 2.0F, 2.0F );
 
-        renderItem( transform, render, stack );
+        renderItem( transform, render, stack, combinedLight );
     }
 }

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

@@ -54,7 +54,7 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
     }
 
     @Override
-    protected void renderItem( PoseStack transform, MultiBufferSource renderer, ItemStack stack )
+    protected void renderItem( PoseStack transform, MultiBufferSource renderer, ItemStack stack, int light )
     {
         ClientComputer computer = ItemPocketComputer.createClientComputer( stack );
         Terminal terminal = computer == null ? null : computer.getTerminal();
@@ -91,7 +91,7 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
         int frameColour = item.getColour( stack );
 
         Matrix4f matrix = transform.last().pose();
-        renderFrame( matrix, renderer, family, frameColour, width, height );
+        renderFrame( matrix, renderer, family, frameColour, light, width, height );
 
         // Render the light
         int lightColour = ItemPocketComputer.getLightState( stack );
@@ -114,7 +114,7 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
         transform.popPose();
     }
 
-    private static void renderFrame( Matrix4f transform, MultiBufferSource render, ComputerFamily family, int colour, int width, int height )
+    private static void renderFrame( Matrix4f transform, MultiBufferSource render, ComputerFamily family, int colour, int light, int width, int height )
     {
         ResourceLocation texture = colour != -1 ? ComputerBorderRenderer.BACKGROUND_COLOUR : ComputerBorderRenderer.getTexture( family );
 
@@ -122,7 +122,7 @@ public final class ItemPocketRenderer extends ItemMapLikeRenderer
         float g = ((colour >>> 8) & 0xFF) / 255.0f;
         float b = (colour & 0xFF) / 255.0f;
 
-        ComputerBorderRenderer.render( transform, render.getBuffer( RenderTypes.positionColorTex( texture ) ), 0, 0, 0, width, height, true, r, g, b );
+        ComputerBorderRenderer.render( transform, render.getBuffer( ComputerBorderRenderer.getRenderType( texture ) ), 0, 0, 0, light, width, height, true, r, g, b );
     }
 
     private static void renderLight( Matrix4f transform, MultiBufferSource render, int colour, int width, int height )

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

@@ -11,6 +11,7 @@ import com.mojang.math.Vector3f;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.media.items.ItemPrintout;
 import net.minecraft.client.renderer.MultiBufferSource;
+import net.minecraft.world.entity.EntityType;
 import net.minecraft.world.item.ItemStack;
 import net.minecraftforge.api.distmarker.Dist;
 import net.minecraftforge.client.event.RenderHandEvent;
@@ -50,13 +51,13 @@ public final class ItemPrintoutRenderer extends ItemMapLikeRenderer
     }
 
     @Override
-    protected void renderItem( PoseStack transform, MultiBufferSource render, ItemStack stack )
+    protected void renderItem( PoseStack transform, MultiBufferSource render, ItemStack stack, int light )
     {
         transform.mulPose( Vector3f.XP.rotationDegrees( 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 );
     }
 
     @SubscribeEvent
@@ -74,10 +75,11 @@ public final class ItemPrintoutRenderer extends ItemMapLikeRenderer
         transform.scale( 0.95f, 0.95f, -0.95f );
         transform.translate( -0.5f, -0.5f, 0.0f );
 
-        drawPrintout( transform, event.getBuffers(), stack );
+        int light = event.getEntityItemFrame().getType() == EntityType.GLOW_ITEM_FRAME ? 0xf000d2 : event.getLight(); // See getLightVal.
+        drawPrintout( transform, event.getBuffers(), stack, light );
     }
 
-    private static void drawPrintout( PoseStack transform, MultiBufferSource render, ItemStack stack )
+    private static void drawPrintout( PoseStack transform, MultiBufferSource render, ItemStack stack, int light )
     {
         int pages = ItemPrintout.getPageCount( stack );
         boolean book = ((ItemPrintout) stack.getItem()).getType() == ItemPrintout.Type.BOOK;
@@ -105,9 +107,10 @@ public final class ItemPrintoutRenderer extends ItemMapLikeRenderer
         transform.translate( (max - width) / 2.0, (max - height) / 2.0, 0.0 );
 
         Matrix4f matrix = transform.last().pose();
-        drawBorder( matrix, render, 0, 0, -0.01f, 0, pages, book );
+        drawBorder( matrix, render, 0, 0, -0.01f, 0, pages, book, light );
-        drawText( matrix, render,
+        drawText(
-            X_TEXT_MARGIN, Y_TEXT_MARGIN, 0, ItemPrintout.getText( stack ), ItemPrintout.getColours( stack )
+            matrix, render, X_TEXT_MARGIN, Y_TEXT_MARGIN, 0, light,
+            ItemPrintout.getText( stack ), ItemPrintout.getColours( stack )
         );
     }
 }

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

@@ -54,32 +54,34 @@ public final class PrintoutRenderer
 
     private PrintoutRenderer() {}
 
-    public static void drawText( Matrix4f transform, MultiBufferSource renderer, int x, int y, int start, TextBuffer[] text, TextBuffer[] colours )
+    public static void drawText( Matrix4f transform, MultiBufferSource renderer, int x, int y, int start, int light, TextBuffer[] text, TextBuffer[] colours )
     {
-        VertexConsumer buffer = renderer.getBuffer( RenderTypes.TERMINAL_WITH_DEPTH );
+        VertexConsumer buffer = renderer.getBuffer( RenderTypes.PRINTOUT_TEXT );
         for( int line = 0; line < LINES_PER_PAGE && line < text.length; line++ )
         {
             FixedWidthFontRenderer.drawString( transform, buffer,
                 x, y + line * FONT_HEIGHT, text[start + line], colours[start + line], null, Palette.DEFAULT,
-                false, 0, 0
+                false, 0, 0,
+                light
             );
         }
     }
 
-    public static void drawText( Matrix4f transform, MultiBufferSource renderer, int x, int y, int start, String[] text, String[] colours )
+    public static void drawText( Matrix4f transform, MultiBufferSource renderer, int x, int y, int start, int light, String[] text, String[] colours )
     {
-        VertexConsumer buffer = renderer.getBuffer( RenderTypes.TERMINAL_WITH_DEPTH );
+        VertexConsumer buffer = renderer.getBuffer( RenderTypes.PRINTOUT_TEXT );
         for( int line = 0; line < LINES_PER_PAGE && line < text.length; line++ )
         {
             FixedWidthFontRenderer.drawString( transform, buffer,
                 x, y + line * FONT_HEIGHT,
                 new TextBuffer( text[start + line] ), new TextBuffer( colours[start + line] ),
-                null, Palette.DEFAULT, false, 0, 0
+                null, Palette.DEFAULT, false, 0, 0,
+                light
             );
         }
     }
 
-    public static void drawBorder( Matrix4f transform, MultiBufferSource renderer, float x, float y, float z, int page, int pages, boolean isBook )
+    public static void drawBorder( Matrix4f transform, MultiBufferSource renderer, float x, float y, float z, int page, int pages, boolean isBook, int light )
     {
         int leftPages = page;
         int rightPages = pages - page - 1;
@@ -94,64 +96,70 @@ 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, 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 );
+            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, buffer,
                 x - offset, y, z - 0.02f, X_SIZE + offset * 2, Y_SIZE,
-                COVER_X + COVER_SIZE / 2.0f, COVER_SIZE, COVER_SIZE, Y_SIZE
+                COVER_X + COVER_SIZE / 2.0f, COVER_SIZE, COVER_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 - 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 );
+                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
+                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, Y_SIZE, light
             );
         }
     }
 
-    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 ).uv( u / BG_SIZE, (v + height) / BG_SIZE ).endVertex();
+        vertex( buffer, matrix, x, y + height, z, u / BG_SIZE, (v + height) / BG_SIZE, light );
-        buffer.vertex( matrix, x + width, y + height, z ).uv( (u + width) / BG_SIZE, (v + height) / BG_SIZE ).endVertex();
+        vertex( buffer, matrix, x + width, y + height, z, (u + width) / BG_SIZE, (v + height) / BG_SIZE, light );
-        buffer.vertex( matrix, x + width, y, z ).uv( (u + width) / BG_SIZE, v / BG_SIZE ).endVertex();
+        vertex( buffer, matrix, x + width, y, z, (u + width) / BG_SIZE, v / BG_SIZE, light );
-        buffer.vertex( matrix, x, y, z ).uv( u / BG_SIZE, v / BG_SIZE ).endVertex();
+        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 )
+    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, int light )
     {
-        buffer.vertex( matrix, x, y + height, z ).uv( u / BG_SIZE, (v + tHeight) / BG_SIZE ).endVertex();
+        vertex( buffer, matrix, x, y + height, z, u / BG_SIZE, (v + tHeight) / BG_SIZE, light );
-        buffer.vertex( matrix, x + width, y + height, z ).uv( (u + tWidth) / BG_SIZE, (v + tHeight) / BG_SIZE ).endVertex();
+        vertex( buffer, matrix, x + width, y + height, z, (u + tWidth) / BG_SIZE, (v + tHeight) / BG_SIZE, light );
-        buffer.vertex( matrix, x + width, y, z ).uv( (u + tWidth) / BG_SIZE, v / BG_SIZE ).endVertex();
+        vertex( buffer, matrix, x + width, y, z, (u + tWidth) / BG_SIZE, v / BG_SIZE, light );
-        buffer.vertex( matrix, x, y, z ).uv( u / BG_SIZE, v / BG_SIZE ).endVertex();
+        vertex( buffer, matrix, x, y, z, u / BG_SIZE, v / BG_SIZE, light );
+    }
+
+    private static void vertex( VertexConsumer buffer, Matrix4f matrix, float x, float y, float z, float u, float v, int light )
+    {
+        buffer.vertex( matrix, x, y, z ).color( 255, 255, 255, 255 ).uv( u, v ).uv2( light ).endVertex();
     }
 
     public static float offsetAt( int page )

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

@@ -9,8 +9,6 @@ import com.mojang.blaze3d.vertex.DefaultVertexFormat;
 import com.mojang.blaze3d.vertex.VertexFormat;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.client.gui.FixedWidthFontRenderer;
-import net.minecraft.Util;
-import net.minecraft.client.renderer.GameRenderer;
 import net.minecraft.client.renderer.RenderStateShard;
 import net.minecraft.client.renderer.RenderType;
 import net.minecraft.client.renderer.ShaderInstance;
@@ -22,11 +20,12 @@ import net.minecraftforge.fml.common.Mod;
 
 import javax.annotation.Nonnull;
 import java.io.IOException;
-import java.util.function.Function;
 
 @Mod.EventBusSubscriber( modid = ComputerCraft.MOD_ID, value = Dist.CLIENT, bus = Mod.EventBusSubscriber.Bus.MOD )
 public class RenderTypes
 {
+    public static final int FULL_BRIGHT_LIGHTMAP = (0xF << 4) | (0xF << 20);
+
     private static MonitorTextureBufferShader monitorTboShader;
     private static ShaderInstance terminalShader;
 
@@ -34,16 +33,18 @@ public class RenderTypes
     public static final RenderType TERMINAL_BLOCKER = Types.TERMINAL_BLOCKER;
     public static final RenderType TERMINAL_WITH_DEPTH = Types.TERMINAL_WITH_DEPTH;
     public static final RenderType MONITOR_TBO = Types.MONITOR_TBO;
+    public static final RenderType PRINTOUT_TEXT = Types.PRINTOUT_TEXT;
 
-    public static final RenderType PRINTOUT_BACKGROUND = Types.PRINTOUT_BACKGROUND;
+    /**
+     * This looks wrong (it should be POSITION_COLOR_TEX_LIGHTMAP surely!) but the fragment/vertex shader for that
+     * appear to entirely ignore the lightmap.
+     *
+     * Note that vanilla maps do the same, so this isn't unreasonable.
+     */
+    public static final RenderType PRINTOUT_BACKGROUND = RenderType.text( new ResourceLocation( "computercraft", "textures/gui/printout.png" ) );
 
     public static final RenderType POSITION_COLOR = Types.POSITION_COLOR;
 
-    public static RenderType positionColorTex( ResourceLocation location )
-    {
-        return Types.POSITION_COLOR_TEX.apply( location );
-    }
-
     @Nonnull
     static MonitorTextureBufferShader getMonitorTextureBufferShader()
     {
@@ -88,6 +89,7 @@ public class RenderTypes
         );
         private static final VertexFormat TERM_FORMAT = DefaultVertexFormat.POSITION_COLOR_TEX;
         private static final VertexFormat.Mode TERM_MODE = VertexFormat.Mode.TRIANGLES;
+        private static final ShaderStateShard TERM_SHADER = new ShaderStateShard( RenderTypes::getTerminalShader );
 
         static final RenderType MONITOR_TBO = RenderType.create(
             "monitor_tbo", DefaultVertexFormat.POSITION_TEX, VertexFormat.Mode.TRIANGLE_STRIP, 128,
@@ -100,32 +102,44 @@ public class RenderTypes
         );
 
         static final RenderType TERMINAL_WITHOUT_DEPTH = RenderType.create(
-            "monitor_basic", TERM_FORMAT, TERM_MODE, 1024,
+            "terminal_without_depth", TERM_FORMAT, TERM_MODE, 1024,
             false, false, // useDelegate, needsSorting
             RenderType.CompositeState.builder()
                 .setTextureState( TERM_FONT_TEXTURE )
-                .setShaderState( new ShaderStateShard( RenderTypes::getTerminalShader ) )
+                .setShaderState( TERM_SHADER )
                 .setWriteMaskState( COLOR_WRITE )
                 .createCompositeState( false )
         );
 
         static final RenderType TERMINAL_BLOCKER = RenderType.create(
-            "monitor_blocker", TERM_FORMAT, TERM_MODE, 256,
+            "terminal_blocker", TERM_FORMAT, TERM_MODE, 256,
             false, false, // useDelegate, needsSorting
             RenderType.CompositeState.builder()
                 .setTextureState( TERM_FONT_TEXTURE )
-                .setShaderState( new ShaderStateShard( RenderTypes::getTerminalShader ) )
+                .setShaderState( TERM_SHADER )
                 .setWriteMaskState( DEPTH_WRITE )
-                .setLightmapState( NO_LIGHTMAP )
                 .createCompositeState( false )
         );
 
         static final RenderType TERMINAL_WITH_DEPTH = RenderType.create(
-            "basic_terminal", TERM_FORMAT, TERM_MODE, 1024,
+            "terminal_with_depth", TERM_FORMAT, TERM_MODE, 1024,
             false, false, // useDelegate, needsSorting
             RenderType.CompositeState.builder()
                 .setTextureState( TERM_FONT_TEXTURE )
-                .setShaderState( POSITION_COLOR_TEX_SHADER )
+                .setShaderState( TERM_SHADER )
+                .createCompositeState( false )
+        );
+
+        /**
+         * A variant of {@link #TERMINAL_WITH_DEPTH} which uses the lightmap rather than rendering fullbright.
+         */
+        static final RenderType PRINTOUT_TEXT = RenderType.create(
+            "printout_text", DefaultVertexFormat.POSITION_COLOR_TEX_LIGHTMAP, TERM_MODE, 1024,
+            false, false, // useDelegate, needsSorting
+            RenderType.CompositeState.builder()
+                .setTextureState( TERM_FONT_TEXTURE )
+                .setShaderState( RenderStateShard.RENDERTYPE_TEXT_SHADER )
+                .setLightmapState( RenderStateShard.LIGHTMAP )
                 .createCompositeState( false )
         );
 
@@ -137,31 +151,6 @@ public class RenderTypes
                 .createCompositeState( false )
         );
 
-        static final Function<ResourceLocation, RenderType> POSITION_COLOR_TEX = Util.memoize( location ->
-        {
-            return RenderType.create(
-                "position_color_tex", DefaultVertexFormat.POSITION_COLOR_TEX, VertexFormat.Mode.QUADS, 1024,
-                false, false, // useDelegate, needsSorting
-                RenderType.CompositeState.builder()
-                    .setTextureState( new RenderStateShard.TextureStateShard( location, false, false ) )// blur, minimap
-                    .setShaderState( POSITION_COLOR_TEX_SHADER )
-                    .createCompositeState( false )
-            );
-        } );
-
-        static final RenderType PRINTOUT_BACKGROUND = RenderType.create(
-            "printout_background", DefaultVertexFormat.POSITION_TEX, VertexFormat.Mode.QUADS, 1024,
-            false, false, // useDelegate, needsSorting
-            RenderType.CompositeState.builder()
-                .setTextureState( new RenderStateShard.TextureStateShard(
-                    new ResourceLocation( "computercraft", "textures/gui/printout.png" ),
-                    false, false // blur, minimap
-                ) )
-                .setShaderState( new RenderStateShard.ShaderStateShard( GameRenderer::getPositionTexShader ) )
-                .setLightmapState( NO_LIGHTMAP )
-                .createCompositeState( false )
-        );
-
         private Types( String name, Runnable setup, Runnable destroy )
         {
             super( name, setup, destroy );

src/main/java/dan200/computercraft/data/BasicCustomLoader.java

@@ -24,11 +24,6 @@ public class BasicCustomLoader<T extends ModelBuilder<T>> extends CustomLoaderBu
         this.extra = extra;
     }
 
-    public static <T extends ModelBuilder<T>> BiFunction<T, ExistingFileHelper, CustomLoaderBuilder<T>> makeFactory( ResourceLocation id )
-    {
-        return makeFactory( id, j -> { } );
-    }
-
     public static <T extends ModelBuilder<T>> BiFunction<T, ExistingFileHelper, CustomLoaderBuilder<T>> makeFactory( ResourceLocation id, Consumer<JsonObject> extra )
     {
         return ( parent, x ) -> new BasicCustomLoader<>( id, parent, x, extra );