Add test for WorldRenderEvents.AFTER_TRANSLUCENT

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

@@ -45,6 +45,12 @@ public interface WorldRenderContext {
 	 */
 	WorldRenderer worldRenderer();
 
+	/**
+	 * The matrix stack is only not null in {@link WorldRenderEvents#AFTER_ENTITIES} or later events.
+	 */
+	@Nullable
+	MatrixStack matrixStack();
+
 	float tickDelta();
 
 	long limitTime();

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

@@ -27,6 +27,7 @@
 import net.minecraft.client.render.VertexConsumer;
 import net.minecraft.client.render.VertexConsumerProvider;
 import net.minecraft.client.render.WorldRenderer;
+import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.client.world.ClientWorld;
 import net.minecraft.entity.Entity;
 import net.minecraft.util.math.BlockPos;
@@ -36,6 +37,7 @@
 
 public final class WorldRenderContextImpl implements WorldRenderContext.BlockOutlineContext, WorldRenderContext {
 	private WorldRenderer worldRenderer;
+	private MatrixStack matrixStack;
 	private float tickDelta;
 	private long limitTime;
 	private boolean blockOutlines;
@@ -93,6 +95,10 @@ public void setFrustum(Frustum frustum) {
 		this.frustum = frustum;
 	}
 
+	public void setMatrixStack(MatrixStack matrixStack) {
+		this.matrixStack = matrixStack;
+	}
+
 	public void prepareBlockOutline(
 			Entity entity,
 			double cameraX,
@@ -114,6 +120,11 @@ public WorldRenderer worldRenderer() {
 		return worldRenderer;
 	}
 
+	@Override
+	public MatrixStack matrixStack() {
+		return matrixStack;
+	}
+
 	@Override
 	public float tickDelta() {
 		return tickDelta;

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

@@ -16,6 +16,7 @@
 
 package net.fabricmc.fabric.mixin.client.rendering;
 
+import com.llamalad7.mixinextras.injector.ModifyExpressionValue;
 import org.joml.Matrix4f;
 import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
@@ -84,6 +85,12 @@ private void afterTerrainSolid(CallbackInfo ci) {
 		WorldRenderEvents.BEFORE_ENTITIES.invoker().beforeEntities(context);
 	}
 
+	@ModifyExpressionValue(method = "render", at = @At(value = "NEW", target = "net/minecraft/client/util/math/MatrixStack"))
+	private MatrixStack setMatrixStack(MatrixStack matrixStack) {
+		context.setMatrixStack(matrixStack);
+		return matrixStack;
+	}
+
 	@Inject(method = "render", at = @At(value = "CONSTANT", args = "stringValue=blockentities", ordinal = 0))
 	private void afterEntities(CallbackInfo ci) {
 		WorldRenderEvents.AFTER_ENTITIES.invoker().afterEntities(context);

fabric-rendering-v1/src/testmodClient/java/net/fabricmc/fabric/test/rendering/client/WorldRenderEventsTests.java

@@ -16,9 +16,17 @@
 
 package net.fabricmc.fabric.test.rendering.client;
 
+import com.mojang.blaze3d.systems.RenderSystem;
+
 import net.minecraft.block.Blocks;
 import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.render.BufferBuilder;
+import net.minecraft.client.render.GameRenderer;
 import net.minecraft.client.render.OverlayTexture;
+import net.minecraft.client.render.Tessellator;
+import net.minecraft.client.render.VertexFormat;
+import net.minecraft.client.render.VertexFormats;
+import net.minecraft.client.render.WorldRenderer;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Vec3d;
@@ -50,9 +58,36 @@ private static boolean onBlockOutline(WorldRenderContext wrc, WorldRenderContext
 		return true;
 	}
 
-	// Renders a diamond block above diamond blocks when they are looked at.
+	/**
+	 * Renders a translucent box at (0, 100, 0).
+	 */
+	private static void renderAfterTranslucent(WorldRenderContext context) {
+		MatrixStack matrices = context.matrixStack();
+		Vec3d camera = context.camera().getPos();
+		Tessellator tessellator = RenderSystem.renderThreadTesselator();
+		BufferBuilder buffer = tessellator.getBuffer();
+
+		matrices.push();
+		matrices.translate((float) -camera.x, (float) -camera.y, (float) -camera.z);
+
+		RenderSystem.setShader(GameRenderer::getPositionColorProgram);
+		RenderSystem.setShaderColor(1f, 1f, 1f, 1f);
+		RenderSystem.enableBlend();
+		RenderSystem.defaultBlendFunc();
+
+		buffer.begin(VertexFormat.DrawMode.TRIANGLE_STRIP, VertexFormats.POSITION_COLOR);
+		WorldRenderer.renderFilledBox(matrices, buffer, 0, 100, 0, 1, 101, 1, 0, 1, 0, 0.5f);
+		tessellator.draw();
+
+		matrices.pop();
+		RenderSystem.disableBlend();
+	}
+
 	@Override
 	public void onInitializeClient() {
+		// Renders a diamond block above diamond blocks when they are looked at.
 		WorldRenderEvents.BLOCK_OUTLINE.register(WorldRenderEventsTests::onBlockOutline);
+		// Renders a translucent box at (0, 100, 0)
+		WorldRenderEvents.AFTER_TRANSLUCENT.register(WorldRenderEventsTests::renderAfterTranslucent);
 	}
 }