Split up turtle textures

Turtles currently read their textures from a single 128x128 sprite
sheet. Most of this texture is unused which means we end up wasting a
lot of the block texture atlas[^1].

This change splits up the turtle textures into individual 32x32
textures[^2], one for each side, and then an additional backpack
texture.

I'm very sorry to any resource pack artists out there. The
tools/update-resources.py script will update existing packs, but does
not (currently) handle non-standard resolutions.

[^1]: It used to be worse: https://github.com/dan200/ComputerCraft/issues/145

[^2]: Turtle textures are a bit weird, in that they mostly *look* 16x16,
  but have some detail in places.

buildSrc/src/main/kotlin/cc/tweaked/gradle/MergeTrees.kt

@@ -98,7 +98,6 @@ override fun visitFile(fileDetails: FileVisitDetails) {
         }
 
         val sharedFiles = files.entries.asSequence().filter { (_, v) -> v.found == sources.size }.map { (k, _) -> k }.toList()
-        println(sharedFiles)
 
         // Copy shared files to the common directory
         fsOperations.sync {

projects/common/src/generated/resources/assets/computercraft/models/block/turtle_advanced.json

@@ -1 +1,12 @@
-{"parent": "computercraft:block/turtle_base", "textures": {"texture": "computercraft:block/turtle_advanced"}}
+{
+  "parent": "computercraft:block/turtle_base",
+  "textures": {
+    "back": "computercraft:block/turtle_advanced_back",
+    "backpack": "computercraft:block/turtle_advanced_backpack",
+    "bottom": "computercraft:block/turtle_advanced_bottom",
+    "front": "computercraft:block/turtle_advanced_front",
+    "left": "computercraft:block/turtle_advanced_left",
+    "right": "computercraft:block/turtle_advanced_right",
+    "top": "computercraft:block/turtle_advanced_top"
+  }
+}

projects/common/src/generated/resources/assets/computercraft/models/block/turtle_normal.json

@@ -1 +1,12 @@
-{"parent": "computercraft:block/turtle_base", "textures": {"texture": "computercraft:block/turtle_normal"}}
+{
+  "parent": "computercraft:block/turtle_base",
+  "textures": {
+    "back": "computercraft:block/turtle_normal_back",
+    "backpack": "computercraft:block/turtle_normal_backpack",
+    "bottom": "computercraft:block/turtle_normal_bottom",
+    "front": "computercraft:block/turtle_normal_front",
+    "left": "computercraft:block/turtle_normal_left",
+    "right": "computercraft:block/turtle_normal_right",
+    "top": "computercraft:block/turtle_normal_top"
+  }
+}

projects/common/src/main/java/dan200/computercraft/data/BlockModelProvider.java

@@ -38,6 +38,9 @@
 
 class BlockModelProvider {
     private static final TextureSlot CURSOR = TextureSlot.create("cursor");
+    private static final TextureSlot LEFT = TextureSlot.create("left");
+    private static final TextureSlot RIGHT = TextureSlot.create("right");
+    private static final TextureSlot BACKPACK = TextureSlot.create("backpack");
 
     private static final ModelTemplate COMPUTER_ON = new ModelTemplate(
         Optional.of(new ResourceLocation(ComputerCraftAPI.MOD_ID, "block/computer_on")),
@@ -58,7 +61,7 @@ class BlockModelProvider {
     private static final ModelTemplate TURTLE = new ModelTemplate(
         Optional.of(new ResourceLocation(ComputerCraftAPI.MOD_ID, "block/turtle_base")),
         Optional.empty(),
-        TextureSlot.TEXTURE
+        TextureSlot.FRONT, TextureSlot.BACK, TextureSlot.TOP, TextureSlot.BOTTOM, LEFT, RIGHT, BACKPACK
     );
     private static final ModelTemplate TURTLE_UPGRADE_LEFT = new ModelTemplate(
         Optional.of(new ResourceLocation(ComputerCraftAPI.MOD_ID, "block/turtle_upgrade_base_left")),
@@ -167,7 +170,16 @@ private static void registerComputer(BlockModelGenerators generators, ComputerBl
     }
 
     private static void registerTurtle(BlockModelGenerators generators, TurtleBlock block) {
-        var model = TURTLE.create(block, TextureMapping.defaultTexture(block), generators.modelOutput);
+        var model = TURTLE.create(block, new TextureMapping()
+                .put(TextureSlot.FRONT, getBlockTexture(block, "_front"))
+                .put(TextureSlot.BACK, getBlockTexture(block, "_back"))
+                .put(TextureSlot.TOP, getBlockTexture(block, "_top"))
+                .put(TextureSlot.BOTTOM, getBlockTexture(block, "_bottom"))
+                .put(LEFT, getBlockTexture(block, "_left"))
+                .put(RIGHT, getBlockTexture(block, "_right"))
+                .put(BACKPACK, getBlockTexture(block, "_backpack")),
+            generators.modelOutput
+        );
         generators.blockStateOutput.accept(
             MultiVariantGenerator.multiVariant(block, Variant.variant().with(VariantProperties.MODEL, model))
                 .with(createHorizontalFacingDispatch())

projects/common/src/main/resources/assets/computercraft/models/block/turtle_base.json

@@ -2,30 +2,30 @@
     "parent": "block/block",
     "render_type": "translucent",
     "textures": {
-        "particle": "#texture"
+        "particle": "#front"
     },
     "elements": [
         {
             "from": [ 2, 2, 2 ],
             "to": [ 14, 14, 13 ],
             "faces": {
-                "down": { "uv": [ 5.75, 2.75, 2.75, 0 ], "texture": "#texture" },
-                "up": { "uv": [ 8.75, 0, 5.75, 2.75 ], "texture": "#texture" },
-                "north": { "uv": [ 11.5, 5.75, 8.5, 2.75 ], "texture": "#texture" },
-                "south": { "uv": [ 5.75, 5.75, 2.75, 2.75 ], "texture": "#texture" },
-                "west": { "uv": [ 8.5, 5.75, 5.75, 2.75 ], "texture": "#texture" },
-                "east": { "uv": [ 2.75, 5.75, 0, 2.75 ], "texture": "#texture" }
+                "down": { "uv": [ 0, 0, 12, 11 ], "texture": "#bottom" },
+                "up": { "uv": [ 0, 0, 12, 11 ], "texture": "#top" },
+                "north": { "uv": [ 0, 0, 12, 12 ], "texture": "#front" },
+                "south": { "uv": [ 0, 0, 12, 12 ], "texture": "#back" },
+                "west": { "uv": [ 0, 0, 11, 12 ], "texture": "#left" },
+                "east": { "uv": [ 0, 0, 11, 12 ], "texture": "#right" }
             }
         },
         {
             "from": [ 3, 6, 13 ],
             "to": [ 13, 13, 15 ],
             "faces": {
-                "down": { "uv": [ 11.75, 0.5, 9.25, 0 ], "texture": "#texture" },
-                "up": { "uv": [ 14.25, 0, 11.75, 0.5 ], "texture": "#texture" },
-                "south": { "uv": [ 11.75, 2.25, 9.25, 0.5 ], "texture": "#texture" },
-                "west": { "uv": [ 12.25, 2.25, 11.75, 0.5 ], "texture": "#texture" },
-                "east": { "uv": [ 9.25, 2.25, 8.75, 0.5 ], "texture": "#texture" }
+                "down": { "uv": [ 2, 9, 12, 11 ], "texture": "#backpack" },
+                "up": { "uv": [ 2, 0, 12, 2 ], "texture": "#backpack" },
+                "south": { "uv": [ 2, 2, 12, 9 ], "texture": "#backpack" },
+                "west": { "uv": [ 0, 2, 2, 9 ], "texture": "#backpack" },
+                "east": { "uv": [ 12, 2, 14, 9 ], "texture": "#backpack" }
             }
         }
     ]

projects/common/src/main/resources/assets/computercraft/models/block/turtle_colour.json

@@ -1,53 +1,67 @@
 {
     "parent": "computercraft:block/turtle_base",
     "textures": {
-        "texture": "computercraft:block/turtle_colour"
+        "texture": "computercraft:block/turtle_colour",
+        "body_back": "computercraft:block/turtle_colour_body_back",
+        "body_backpack": "computercraft:block/turtle_colour_body_backpack",
+        "body_bottom": "computercraft:block/turtle_colour_body_bottom",
+        "body_front": "computercraft:block/turtle_colour_body_front",
+        "body_left": "computercraft:block/turtle_colour_body_left",
+        "body_right": "computercraft:block/turtle_colour_body_right",
+        "body_top": "computercraft:block/turtle_colour_body_top",
+        "frame_back": "computercraft:block/turtle_colour_frame_back",
+        "frame_backpack": "computercraft:block/turtle_colour_frame_backpack",
+        "frame_bottom": "computercraft:block/turtle_colour_frame_bottom",
+        "frame_front": "computercraft:block/turtle_colour_frame_front",
+        "frame_left": "computercraft:block/turtle_colour_frame_left",
+        "frame_right": "computercraft:block/turtle_colour_frame_right",
+        "frame_top": "computercraft:block/turtle_colour_frame_top"
     },
     "elements": [
         {
             "from": [ 2, 2, 2 ],
             "to": [ 14, 14, 13 ],
             "faces": {
-                "down": { "uv": [ 5.75, 8.5, 2.75, 5.75 ], "texture": "#texture", "tintindex": 0 },
-                "up": { "uv": [ 8.75, 5.75, 5.75, 8.5 ], "texture": "#texture", "tintindex": 0 },
-                "north": { "uv": [ 11.5, 11.5, 8.5, 8.5 ], "texture": "#texture", "tintindex": 0 },
-                "south": { "uv": [ 5.75, 11.5, 2.75, 8.5 ], "texture": "#texture", "tintindex": 0 },
-                "west": { "uv": [ 8.5, 11.5, 5.75, 8.555 ], "texture": "#texture", "tintindex": 0 },
-                "east": { "uv": [ 2.75, 11.5, 0, 8.5 ], "texture": "#texture", "tintindex": 0 }
+                "down": { "uv": [ 0, 0, 12, 11 ], "texture": "#body_bottom", "tintindex": 0 },
+                "up": { "uv": [ 0, 0, 12, 11 ], "texture": "#body_top", "tintindex": 0 },
+                "north": { "uv": [ 0, 0, 12, 12 ], "texture": "#body_front", "tintindex": 0 },
+                "south": { "uv": [ 0, 0, 12, 12 ], "texture": "#body_back", "tintindex": 0 },
+                "west": { "uv": [ 0, 0, 11, 12 ], "texture": "#body_left", "tintindex": 0 },
+                "east": { "uv": [ 0, 0, 11, 12 ], "texture": "#body_right", "tintindex": 0 }
             }
         },
         {
             "from": [ 3, 6, 13 ],
             "to": [ 13, 13, 15 ],
             "faces": {
-                "down": { "uv": [ 11.75, 6.25, 9.25, 5.75 ], "texture": "#texture", "tintindex": 0 },
-                "up": { "uv": [ 14.25, 5.75, 11.75, 6.25 ], "texture": "#texture", "tintindex": 0 },
-                "south": { "uv": [ 11.75, 8, 9.25, 6.25 ], "texture": "#texture", "tintindex": 0 },
-                "west": { "uv": [ 12.25, 8, 11.75, 6.25 ], "texture": "#texture", "tintindex": 0 },
-                "east": { "uv": [ 9.25, 8, 8.75, 6.25 ], "texture": "#texture", "tintindex": 0 }
+                "down": { "uv": [ 2, 9, 12, 11 ], "texture": "#body_backpack", "tintindex": 0 },
+                "up": { "uv": [ 2, 0, 12, 2 ], "texture": "#body_backpack", "tintindex": 0 },
+                "south": { "uv": [ 2, 2, 12, 9 ], "texture": "#body_backpack", "tintindex": 0 },
+                "west": { "uv": [ 0, 2, 2, 9 ], "texture": "#body_backpack", "tintindex": 0 },
+                "east": { "uv": [ 12, 2, 14, 9 ], "texture": "#body_backpack", "tintindex": 0 }
             }
         },
         {
             "from": [ 2, 2, 2 ],
             "to": [ 14, 14, 13 ],
             "faces": {
-                "down": { "uv": [ 5.75, 2.75, 2.75, 0 ], "texture": "#texture" },
-                "up": { "uv": [ 8.75, 0, 5.75, 2.75 ], "texture": "#texture" },
-                "north": { "uv": [ 11.5, 5.75, 8.5, 2.75 ], "texture": "#texture" },
-                "south": { "uv": [ 5.75, 5.75, 2.75, 2.75 ], "texture": "#texture" },
-                "west": { "uv": [ 8.5, 5.75, 5.75, 2.75 ], "texture": "#texture" },
-                "east": { "uv": [ 2.75, 5.75, 0, 2.75 ], "texture": "#texture" }
+                "down": { "uv": [ 0, 0, 12, 11 ], "texture": "#frame_bottom" },
+                "up": { "uv": [ 0, 0, 12, 11 ], "texture": "#frame_top" },
+                "north": { "uv": [ 0, 0, 12, 12 ], "texture": "#frame_front" },
+                "south": { "uv": [ 0, 0, 12, 12 ], "texture": "#frame_back" },
+                "west": { "uv": [ 0, 0, 11, 12 ], "texture": "#frame_left" },
+                "east": { "uv": [ 0, 0, 11, 12 ], "texture": "#frame_right" }
             }
         },
         {
             "from": [ 3, 6, 13 ],
             "to": [ 13, 13, 15 ],
             "faces": {
-                "down": { "uv": [ 11.75, 0.5, 9.25, 0 ], "texture": "#texture" },
-                "up": { "uv": [ 14.25, 0, 11.75, 0.5 ], "texture": "#texture" },
-                "south": { "uv": [ 11.75, 2.25, 9.25, 0.5 ], "texture": "#texture" },
-                "west": { "uv": [ 12.25, 2.25, 11.75, 0.5 ], "texture": "#texture" },
-                "east": { "uv": [ 9.25, 2.25, 8.75, 0.5 ], "texture": "#texture" }
+                "down": { "uv": [ 2, 9, 12, 11 ], "texture": "#frame_backpack" },
+                "up": { "uv": [ 2, 0, 12, 2 ], "texture": "#frame_backpack" },
+                "south": { "uv": [ 2, 2, 12, 9 ], "texture": "#frame_backpack" },
+                "west": { "uv": [ 0, 2, 2, 9 ], "texture": "#frame_backpack" },
+                "east": { "uv": [ 12, 2, 14, 9 ], "texture": "#frame_backpack" }
             }
         }
     ]

projects/common/src/main/resources/assets/computercraft/models/block/turtle_elf_overlay.json

@@ -1,6 +1,35 @@
 {
-    "parent": "computercraft:block/turtle_overlay",
+    "parent": "block/block",
     "textures": {
-        "texture": "computercraft:block/turtle_elf_overlay"
-    }
-}
+      "back": "computercraft:block/turtle_elf_overlay_back",
+      "backpack": "computercraft:block/turtle_elf_overlay_backpack",
+      "front": "computercraft:block/turtle_elf_overlay_front",
+      "left": "computercraft:block/turtle_elf_overlay_left",
+      "right": "computercraft:block/turtle_elf_overlay_right",
+      "top": "computercraft:block/turtle_elf_overlay_top"
+    },
+    "elements": [
+        {
+            "from": [ 2, 2, 2 ],
+            "to": [ 14, 14, 13 ],
+            "faces": {
+                "up": { "uv": [ 0, 0, 12, 11 ], "texture": "#top" },
+                "north": { "uv": [ 0, 0, 12, 12 ], "texture": "#front" },
+                "south": { "uv": [ 0, 0, 12, 12 ], "texture": "#back" },
+                "west": { "uv": [ 0, 0, 11, 12 ], "texture": "#left" },
+                "east": { "uv": [ 0, 0, 11, 12 ], "texture": "#right" }
+            }
+        },
+        {
+            "from": [ 3, 6, 13 ],
+            "to": [ 13, 13, 15 ],
+            "faces": {
+                "down": { "uv": [ 2, 9, 12, 11 ], "texture": "#backpack" },
+                "up": { "uv": [ 2, 0, 12, 2 ], "texture": "#backpack" },
+                "south": { "uv": [ 2, 2, 12, 9 ], "texture": "#backpack" },
+                "west": { "uv": [ 0, 2, 2, 9 ], "texture": "#backpack" },
+                "east": { "uv": [ 12, 2, 14, 9 ], "texture": "#backpack" }
+            }
+        }
+    ]
+  }

projects/common/src/main/resources/assets/computercraft/models/block/turtle_overlay.json

@@ -1,43 +0,0 @@
-{
-    "parent": "block/block",
-    "textures": {
-        "particle": "#texture"
-    },
-    "elements": [
-        {
-            "from": [ 2, 2, 2 ],
-            "to": [ 14, 14, 13 ],
-            "faces": {
-                "down": { "uv": [ 2.75, 0, 5.75, 2.75 ], "texture": "#texture" },
-                "up": { "uv": [ 5.75, 0, 8.75, 2.75 ], "texture": "#texture" },
-                "north": { "uv": [ 8.5, 5.75, 11.5, 2.75 ], "texture": "#texture" },
-                "south": { "uv": [ 2.75, 5.75, 5.75, 2.75 ], "texture": "#texture" },
-                "west": { "uv": [ 0, 5.75, 2.75, 2.75 ], "texture": "#texture" },
-                "east": { "uv": [ 5.75, 5.75, 8.5, 2.75 ], "texture": "#texture" }
-            }
-        },
-        {
-            "from": [ 3, 6, 13 ],
-            "to": [ 13, 13, 15 ],
-            "faces": {
-                "down": { "uv": [ 9.25, 0, 11.75, 0.5 ], "texture": "#texture" },
-                "up": { "uv": [ 11.75, 0, 14.25, 0.5 ], "texture": "#texture" },
-                "south": { "uv": [ 9.25, 2.25, 11.75, 0.5 ], "texture": "#texture" },
-                "west": { "uv": [ 8.75, 2.25, 9.25, 0.5 ], "texture": "#texture" },
-                "east": { "uv": [ 11.75, 2.25, 12.25, 0.5 ], "texture": "#texture" }
-            }
-        },
-        {
-            "from": [ 1.5, 1.5, 1.5 ],
-            "to": [ 14.5, 14.5, 13.5 ],
-            "faces": {
-                "down": { "uv": [ 2.75, 8, 5.75, 10.75 ], "texture": "#texture" },
-                "up": { "uv": [ 5.75, 8, 8.75, 10.75 ], "texture": "#texture" },
-                "north": { "uv": [ 8.5, 13.75, 11.5, 10.75 ], "texture": "#texture" },
-                "south": { "uv": [ 2.75, 13.75, 5.75, 10.75 ], "texture": "#texture" },
-                "west": { "uv": [ 0, 13.75, 2.75, 10.75 ], "texture": "#texture" },
-                "east": { "uv": [ 5.75, 13.75, 8.5, 10.75 ], "texture": "#texture" }
-            }
-        }
-    ]
-}

tools/update-resources.py

@@ -76,6 +76,45 @@ def unstitch_corners(input_file: pathlib.Path, family: str):
         sidebar.save(output_dir / f"sidebar_{family}.png")
 
 
+def unstitch_turtle(input_file: pathlib.Path, family: str, *, dy: int = 0):
+    input = Image.open(input_file)
+    output_dir = input_file.parent
+
+    fragments = [
+        ("bottom", 22, 0, 24, 22, Image.Transpose.ROTATE_180),
+        ("top", 46, 0, 24, 22, Image.Transpose.FLIP_LEFT_RIGHT),
+        ("right", 0, 22, 22, 24, Image.Transpose.ROTATE_180),
+        ("back", 22, 22, 24, 24, Image.Transpose.ROTATE_180),
+        ("left", 46, 22, 22, 24, Image.Transpose.ROTATE_180),
+        ("front", 68, 22, 24, 24, Image.Transpose.ROTATE_180),
+    ]
+
+    for suffix, x, y, w, h, transform in fragments:
+        if family == "elf_overlay" and suffix == "bottom":
+            continue
+
+        slice = input.crop(box(x, dy + y, w, h)).transpose(transform)
+
+        fragment = Image.new("RGBA", (32, 32))
+        fragment.paste(slice)
+        fragment.save(output_dir / f"turtle_{family}_{suffix}.png")
+
+    backpack = Image.new("RGBA", (32, 32))
+    backpack.paste(
+        input.crop(box(70, dy + 4, 28, 14)).transpose(Image.Transpose.ROTATE_180),
+        (0, 4),
+    )
+    backpack.paste(
+        input.crop(box(74, dy + 0, 20, 4)).transpose(Image.Transpose.ROTATE_180),
+        (4, 18),
+    )
+    backpack.paste(
+        input.crop(box(94, dy + 0, 20, 4)).transpose(Image.Transpose.FLIP_LEFT_RIGHT),
+        (4, 0),
+    )
+    backpack.save(output_dir / f"turtle_{family}_backpack.png")
+
+
 def main() -> None:
     spec = argparse.ArgumentParser()
     spec.add_argument("dir", type=pathlib.Path)
@@ -97,6 +136,18 @@ def main() -> None:
             unstitch_corners(path, family)
             transformed.append(path)
 
+    for family in ("normal", "advanced", "elf_overlay"):
+        path = texture_path / "block" / f"turtle_{family}.png"
+        if path.exists():
+            unstitch_turtle(path, family)
+            transformed.append(path)
+
+    path = texture_path / "block" / f"turtle_colour.png"
+    if path.exists():
+        unstitch_turtle(path, "colour_frame")
+        unstitch_turtle(path, "colour_body", dy=46)
+        transformed.append(path)
+
     if len(transformed) == 0:
         print("No files were transformed")
         return