Implement dynamic block tinting support with BlockTintsFactory integration

fabric-renderer-indigo/src/client/java/net/fabricmc/fabric/impl/client/indigo/renderer/render/AltModelBlockRendererImpl.java

@@ -22,6 +22,10 @@
 import it.unimi.dsi.fastutil.ints.IntArrayList;
 import it.unimi.dsi.fastutil.ints.IntList;
 import it.unimi.dsi.fastutil.objects.ObjectArrayList;
+
+import net.fabricmc.fabric.api.client.rendering.v1.BlockColorRegistry;
+import net.fabricmc.fabric.api.client.rendering.v1.BlockTintsFactory;
+
 import org.joml.Vector3f;
 import org.jspecify.annotations.Nullable;
 
@@ -201,6 +205,19 @@ private int computeTintColor(final BlockAndTintGetter level, final BlockState st
 		if (!tintSourcesInitialized) {
 			configureTintCache(state);
 			tintSourcesInitialized = true;
+
+			if (this.tintSources.isEmpty()) {
+				final BlockTintsFactory factory = BlockColorRegistry.factoryFor(state);
+				if (factory != null) {
+					factory.collect(state, level, pos, this.computedTintValues);
+				}
+
+				if (!this.computedTintValues.isEmpty()) {
+					for (int i = 0; i < this.computedTintValues.size(); i++) {
+						this.tintSources.add(null);
+					}
+				}
+			}
 		}
 
 		if (tintIndex >= tintSources.size()) {

fabric-rendering-v1/src/client/java/net/fabricmc/fabric/api/client/rendering/v1/BlockColorRegistry.java

@@ -25,6 +25,10 @@
 
 import net.fabricmc.fabric.impl.client.rendering.BlockColorRegistryImpl;
 
+import net.minecraft.world.level.block.state.BlockState;
+
+import org.jspecify.annotations.Nullable;
+
 /**
  * The registry for {@link BlockTintSource}s.
  */
@@ -44,4 +48,25 @@ private BlockColorRegistry() {
 	public static void register(List<BlockTintSource> layers, Block... blocks) {
 		BlockColorRegistryImpl.register(layers, blocks);
 	}
+
+	/**
+	 * Register a block tint factory for one or more blocks. Overriding existing registration is allowed.
+	 *
+	 * @param factory The factory which allows dynamic tinting.
+	 * @param blocks The blocks which should be colored using the given factory.
+	 */
+	public static void register(BlockTintsFactory factory, Block... blocks) {
+		BlockColorRegistryImpl.register(factory, blocks);
+	}
+
+	/**
+	 * Retrieves the current {@link BlockTintsFactory factory}, or {@code null} if no factory exists,
+	 * for the given {@link BlockState block state}.
+	 *
+	 * @param blockState The block state to look up.
+	 * @return The factory.
+	 */
+	public static @Nullable BlockTintsFactory factoryFor(BlockState blockState) {
+		return BlockColorRegistryImpl.factoryFor(blockState);
+	}
 }

fabric-rendering-v1/src/client/java/net/fabricmc/fabric/api/client/rendering/v1/BlockTintsFactory.java

@@ -0,0 +1,43 @@
+package net.fabricmc.fabric.api.client.rendering.v1;
+
+import it.unimi.dsi.fastutil.ints.IntList;
+
+import net.minecraft.client.renderer.block.BlockAndTintGetter;
+import net.minecraft.client.resources.model.geometry.BakedQuad;
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.level.block.state.BlockState;
+
+/**
+ * This factory takes over the collection of tint colors in a model renderer.
+ * <p>
+ *     If this factory provides any tints in the tintValues collections of its {@link #collect(BlockState, BlockAndTintGetter, BlockPos, IntList)}
+ *     method then the default vanilla behaviour of iterating the registered {@link net.minecraft.client.color.block.BlockTintSource block tint sources}
+ *     is skipped.
+ * </p>
+ * <p>
+ *     This factory is only invoked if no {@link net.minecraft.client.color.block.BlockTintSource tint source} has been registered for the {@link BlockState block state}.
+ * </p>
+ */
+@FunctionalInterface
+public interface BlockTintsFactory
+{
+	/**
+	 * Invoked to collect the dynamic tint values for the given block state.
+	 * <p>
+	 *     The tint applied to a given {@link net.minecraft.client.resources.model.geometry.BakedQuad quad}
+	 *     is then determined based on the index stored in {@link BakedQuad.MaterialInfo#tintIndex()} by looking
+	 *     them up in the tint values list after this collect method is called.
+	 * </p>
+	 * <p>
+	 *     The resulting tints might be cached for this state, level and position, while the
+	 *     given position and model are rendered, but may not be stored beyond that time window,
+	 *     especially not beyond any given frame being rendered.
+	 * </p>
+	 *
+	 * @param state The state for which the tints are retrieved.
+	 * @param level The level in which they are retrieved.
+	 * @param pos The position inside the level for which they are retrieved.
+	 * @param tintValues The target collection in which to store the tint values for the given index.
+	 */
+	void collect(BlockState state, BlockAndTintGetter level, BlockPos pos, IntList tintValues);
+}

fabric-rendering-v1/src/client/java/net/fabricmc/fabric/impl/client/rendering/BlockColorRegistryImpl.java

@@ -20,6 +20,11 @@
 import java.util.List;
 import java.util.Map;
 
+import net.fabricmc.fabric.api.client.rendering.v1.BlockTintsFactory;
+
+import net.minecraft.world.level.block.state.BlockState;
+
+import org.jspecify.annotations.NonNull;
 import org.jspecify.annotations.Nullable;
 
 import net.minecraft.client.color.block.BlockColors;
@@ -32,6 +37,8 @@ public final class BlockColorRegistryImpl {
 	@Nullable
 	private static Map<Block, List<BlockTintSource>> map = new IdentityHashMap<>();
 
+	private static Map<Block, BlockTintsFactory> factories = new IdentityHashMap<>();
+
 	public static void initialize(BlockColors blockColors) {
 		if (BlockColorRegistryImpl.blockColors != null) {
 			return;
@@ -52,4 +59,17 @@ public static void register(List<BlockTintSource> layers, Block... blocks) {
 			}
 		}
 	}
+
+	public static void register(final BlockTintsFactory factory, final Block[] blocks)
+	{
+		for (final Block block : blocks)
+		{
+			factories.put(block, factory);
+		}
+	}
+
+	public static @Nullable BlockTintsFactory factoryFor(final BlockState blockState)
+	{
+		return factories.get(blockState.getBlock());
+	}
 }

fabric-rendering-v1/src/client/java/net/fabricmc/fabric/mixin/client/rendering/ModelBlockRendererMixin.java

@@ -0,0 +1,66 @@
+package net.fabricmc.fabric.mixin.client.rendering;
+
+import it.unimi.dsi.fastutil.ints.IntList;
+
+import net.fabricmc.fabric.api.client.rendering.v1.BlockColorRegistry;
+import net.fabricmc.fabric.api.client.rendering.v1.BlockTintsFactory;
+
+import net.minecraft.client.color.block.BlockTintSource;
+import net.minecraft.client.renderer.block.BlockAndTintGetter;
+import net.minecraft.client.renderer.block.ModelBlockRenderer;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.level.block.state.BlockState;
+
+import org.jspecify.annotations.Nullable;
+import org.objectweb.asm.Opcodes;
+import org.spongepowered.asm.mixin.Final;
+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 java.util.List;
+
+@Mixin(ModelBlockRenderer.class)
+public abstract class ModelBlockRendererMixin
+{
+
+	@Shadow
+	@Final
+	private IntList                         computedTintValues;
+	@Shadow
+	@Final
+	private List<@Nullable BlockTintSource> tintSources;
+
+	@Inject(
+			method = "computeTintColor(Lnet/minecraft/client/renderer/block/BlockAndTintGetter;Lnet/minecraft/world/level/block/state/BlockState;Lnet/minecraft/core/BlockPos;I)I",
+			at = @At(
+					value = "FIELD",
+					target = "Lnet/minecraft/client/renderer/block/ModelBlockRenderer;tintSourcesInitialized:Z",
+					opcode = Opcodes.PUTFIELD,
+					shift = At.Shift.AFTER
+			)
+
+	)
+	private void injectFactoryTintCacheLoading(
+			final BlockAndTintGetter level,
+			final BlockState state,
+			final BlockPos pos,
+			final int tintIndex,
+			final CallbackInfoReturnable<Integer> cir) {
+		if (this.tintSources.isEmpty()) {
+			final BlockTintsFactory factory = BlockColorRegistry.factoryFor(state);
+			if (factory != null) {
+				factory.collect(state, level, pos, this.computedTintValues);
+			}
+
+			if (!this.computedTintValues.isEmpty()) {
+				for (int i = 0; i < this.computedTintValues.size(); i++) {
+					this.tintSources.add(null);
+				}
+			}
+		}
+	}
+}

fabric-rendering-v1/src/client/resources/fabric-rendering-v1.mixins.json

@@ -24,6 +24,7 @@
     "LevelRendererMixin",
     "LivingEntityRendererAccessor",
     "LivingEntityRendererMixin",
+    "ModelBlockRendererMixin",
     "ModelLayersAccessor",
     "ModelMixin",
     "ModelPartAccessor",