fix rendering with shaders as much as i can

common/src/main/java/io/github/slimeistdev/crystalline_sky/compat/iris/IrisHelpers.java

@@ -8,10 +8,31 @@ import net.fabricmc.api.EnvType;
 import net.fabricmc.api.Environment;
 import net.irisshaders.iris.Iris;
 import net.irisshaders.iris.pipeline.IrisRenderingPipeline;
+import net.irisshaders.iris.pipeline.WorldRenderingPhase;
 import net.irisshaders.iris.targets.RenderTargets;
+import net.irisshaders.iris.vertices.ImmediateState;
 
 @Environment(EnvType.CLIENT)
 public class IrisHelpers {
+	public static boolean isShaderpackPipelineActive() {
+		return Iris.getPipelineManager().getPipelineNullable() instanceof IrisRenderingPipeline;
+	}
+
+	public static void pushVanillaShaders() {
+		ImmediateState.bypass = true;
+	}
+
+	public static void popVanillaShaders() {
+		ImmediateState.bypass = false;
+	}
+
+	public static void resetRenderingPhase() {
+		var pipeline = Iris.getPipelineManager().getPipelineNullable();
+		if (pipeline instanceof IrisRenderingPipeline irisPipeline) {
+			irisPipeline.setPhase(WorldRenderingPhase.NONE);
+		}
+	}
+
 	public static boolean copySkyToBuffer(RenderTarget skyBuffer) {
 		var pipeline = Iris.getPipelineManager().getPipelineNullable();
 		if (!(pipeline instanceof IrisRenderingPipeline irisPipeline)) return false;

common/src/main/java/io/github/slimeistdev/crystalline_sky/compat/sodium/SkyShaderInterface.java

@@ -1,6 +1,8 @@
 package io.github.slimeistdev.crystalline_sky.compat.sodium;
 
 import com.mojang.blaze3d.platform.GlStateManager;
+import com.mojang.blaze3d.systems.RenderSystem;
+import io.github.slimeistdev.crystalline_sky.mixin_ducks.client.LevelRenderer_Duck;
 import io.github.slimeistdev.crystalline_sky.registry.CrystallineItems;
 import net.caffeinemc.mods.sodium.client.gl.shader.uniform.GlUniformFloat3v;
 import net.caffeinemc.mods.sodium.client.gl.shader.uniform.GlUniformFloat4v;
@@ -11,7 +13,6 @@ import net.caffeinemc.mods.sodium.client.render.chunk.shader.ChunkShaderInterfac
 import net.caffeinemc.mods.sodium.client.render.chunk.shader.ChunkShaderOptions;
 import net.caffeinemc.mods.sodium.client.render.chunk.shader.ChunkShaderTextureSlot;
 import net.caffeinemc.mods.sodium.client.render.chunk.shader.ShaderBindingContext;
-import net.caffeinemc.mods.sodium.client.util.TextureUtil;
 import net.minecraft.client.Minecraft;
 import net.minecraft.util.Mth;
 import org.joml.Matrix4fc;
@@ -46,9 +47,14 @@ public class SkyShaderInterface implements ChunkShaderInterface {
 		this.fogShader = options.fog().getFactory().apply(context);
 	}
 
+	protected int getBoundTextureId() {
+		var fb = ((LevelRenderer_Duck) Minecraft.getInstance().levelRenderer).crystalline_sky$getSkyFramebuffer();
+		return fb.getColorTextureId();
+	}
+
 	@Override
 	public void setupState() {
-		this.bindTexture(ChunkShaderTextureSlot.BLOCK, TextureUtil.getBlockTextureId());
+		this.bindTexture(ChunkShaderTextureSlot.BLOCK, getBoundTextureId());
 
 		Minecraft client = Minecraft.getInstance();
 		if (client.level != null
@@ -80,6 +86,7 @@ public class SkyShaderInterface implements ChunkShaderInterface {
 		forRemoval = true
 	)
 	private void bindTexture(ChunkShaderTextureSlot slot, int textureId) {
+		RenderSystem.setShaderTexture(slot.ordinal(), textureId);
 		GlStateManager._activeTexture(GL32C.GL_TEXTURE0 + slot.ordinal());
 		GlStateManager._bindTexture(textureId);
 		GlUniformInt uniform = this.uniformTextures.get(slot);

common/src/main/java/io/github/slimeistdev/crystalline_sky/compat/sodium/SkyboxShaderInterface.java

@@ -34,4 +34,9 @@ public class SkyboxShaderInterface extends SkyShaderInterface {
 			);
 		}
 	}
+
+	@Override
+	protected int getBoundTextureId() {
+		return Minecraft.getInstance().getTextureManager().getTexture(CrystallineAtlases.SKYBOXES.texture).getId();
+	}
 }

common/src/main/java/io/github/slimeistdev/crystalline_sky/mixin/client/LevelRendererMixin.java

@@ -2,6 +2,8 @@ package io.github.slimeistdev.crystalline_sky.mixin.client;
 
 import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
 import com.llamalad7.mixinextras.injector.wrapoperation.WrapOperation;
+import com.mojang.blaze3d.platform.GlConst;
+import com.mojang.blaze3d.platform.GlStateManager;
 import com.mojang.blaze3d.pipeline.RenderTarget;
 import com.mojang.blaze3d.pipeline.TextureTarget;
 import com.mojang.blaze3d.systems.RenderSystem;
@@ -63,6 +65,7 @@ public abstract class LevelRendererMixin implements LevelRenderer_Duck {
 		if (crystalline_sky$skyBuffer == null) {
 			var fb = minecraft.getMainRenderTarget();
 			crystalline_sky$skyBuffer = new TextureTarget(fb.width, fb.height, true, Minecraft.ON_OSX);
+			crystalline_sky$configureSkyBufferTexture();
 		}
 		return crystalline_sky$skyBuffer;
 	}
@@ -86,6 +89,7 @@ public abstract class LevelRendererMixin implements LevelRenderer_Duck {
 	private void resizeSkyBuffer(int width, int height, CallbackInfo ci) {
 		if (crystalline_sky$skyBuffer != null) {
 			crystalline_sky$skyBuffer.resize(width, height, Minecraft.ON_OSX);
+			crystalline_sky$configureSkyBufferTexture();
 		}
 	}
 
@@ -108,27 +112,31 @@ public abstract class LevelRendererMixin implements LevelRenderer_Duck {
 	private void copyAfterSky(DeltaTracker tickCounter, boolean renderBlockOutline, Camera camera,
 							  GameRenderer gameRenderer, LightTexture lightmapTextureManager,
 							  Matrix4f matrix4f, Matrix4f matrix4f2, CallbackInfo ci) {
-		var skyBuffer = crystalline_sky$getSkyFramebuffer();
-		skyBuffer.clear(Minecraft.ON_OSX);
-
 		float partialTick = tickCounter.getGameTimeDeltaPartialTick(false);
-		if (crystalline_sky$isBelowHorizon(partialTick)) {
+		if (crystalline_sky$isBelowHorizon(partialTick)
+			|| Mods.IRIS.runIfInstalled(() -> IrisHelpers::isShaderpackPipelineActive).orElse(false)) {
+			var skyBuffer = crystalline_sky$getSkyFramebuffer();
+			skyBuffer.clear(Minecraft.ON_OSX);
 			crystalline_sky$renderSkyBuffer(skyBuffer, tickCounter, camera, gameRenderer, matrix4f, matrix4f2);
 		} else {
-			var copiedFromIris = Mods.IRIS.runIfInstalled(() -> () -> IrisHelpers.copySkyToBuffer(skyBuffer));
+			var skyBuffer = crystalline_sky$getSkyFramebuffer();
-			if (!copiedFromIris.orElse(false))
+			skyBuffer.clear(Minecraft.ON_OSX);
-				((RenderTarget_Duck) skyBuffer).crystalline_sky$copyColorFrom(minecraft.getMainRenderTarget());
+			((RenderTarget_Duck) skyBuffer).crystalline_sky$copyColorFrom(minecraft.getMainRenderTarget());
 		}
 
+		// Iris shader packs replace cloud rendering; baking them into the sky buffer causes artifacts.
+		boolean irisShaderpackActive = Mods.IRIS.runIfInstalled(() -> IrisHelpers::isShaderpackPipelineActive).orElse(false);
+
 		// render clouds
 		CloudStatus cloudRenderMode = this.minecraft.options.getCloudsType();
-		if (cloudRenderMode != CloudStatus.OFF && !this.doesMobEffectBlockSky(camera)) {
+		if (cloudRenderMode != CloudStatus.OFF && !irisShaderpackActive && !this.doesMobEffectBlockSky(camera)) {
 			float f = tickCounter.getGameTimeDeltaPartialTick(false);
 			Vec3 vec3d = camera.getPosition();
 			double cx = vec3d.x();
 			double cy = vec3d.y();
 			double cz = vec3d.z();
 
+			var skyBuffer = crystalline_sky$getSkyFramebuffer();
 			var cloudsFramebuffer0 = this.cloudsTarget;
 			this.cloudsTarget = skyBuffer;
 			cloudsTarget.bindWrite(false);
@@ -156,6 +164,18 @@ public abstract class LevelRendererMixin implements LevelRenderer_Duck {
 		renderSectionLayer(CrystallineRenderTypes.SKYBOX, x, y, z, matrix4f, positionMatrix);
 	}
 
+	@Unique
+	private void crystalline_sky$configureSkyBufferTexture() {
+		if (crystalline_sky$skyBuffer == null) {
+			return;
+		}
+
+		RenderSystem.assertOnRenderThreadOrInit();
+		GlStateManager._bindTexture(crystalline_sky$skyBuffer.getColorTextureId());
+		GlStateManager._texParameter(GlConst.GL_TEXTURE_2D, GlConst.GL_TEXTURE_WRAP_S, GlConst.GL_CLAMP_TO_EDGE);
+		GlStateManager._texParameter(GlConst.GL_TEXTURE_2D, GlConst.GL_TEXTURE_WRAP_T, GlConst.GL_CLAMP_TO_EDGE);
+	}
+
 	@Unique
 	private boolean crystalline_sky$isBelowHorizon(float partialTick) {
 		var level = minecraft.level;
@@ -185,7 +205,14 @@ public abstract class LevelRendererMixin implements LevelRenderer_Duck {
 			|| minecraft.gui.getBossOverlay().shouldCreateWorldFog();
 
 		skyBuffer.bindWrite(false);
-		SharedRenderVariables.pushSkipVoidSky();
+		RenderSystem.viewport(0, 0, skyBuffer.width, skyBuffer.height);
+		SharedRenderVariables.pushCapturingSkyBuffer();
+		boolean belowHorizon = crystalline_sky$isBelowHorizon(partialTick);
+		if (belowHorizon) {
+			SharedRenderVariables.pushSkipVoidSky();
+		}
+		SharedRenderVariables.pushBlockIrisShaderFramebufferBind();
+		Mods.IRIS.executeIfInstalled(() -> IrisHelpers::pushVanillaShaders);
 		try {
 			FogRenderer.setupColor(
 				camera,
@@ -207,8 +234,16 @@ public abstract class LevelRendererMixin implements LevelRenderer_Duck {
 				() -> FogRenderer.setupFog(camera, FogRenderer.FogMode.FOG_SKY, renderDistance, isFoggy, partialTick)
 			);
 		} finally {
-			SharedRenderVariables.popSkipVoidSky();
+			Mods.IRIS.executeIfInstalled(() -> IrisHelpers::popVanillaShaders);
-			minecraft.getMainRenderTarget().bindWrite(false);
+			SharedRenderVariables.popBlockIrisShaderFramebufferBind();
+			if (belowHorizon) {
+				SharedRenderVariables.popSkipVoidSky();
+			}
+			SharedRenderVariables.popCapturingSkyBuffer();
+			Mods.IRIS.executeIfInstalled(() -> IrisHelpers::resetRenderingPhase);
+			var main = minecraft.getMainRenderTarget();
+			main.bindWrite(false);
+			RenderSystem.viewport(0, 0, main.width, main.height);
 		}
 	}
 }

common/src/main/java/io/github/slimeistdev/crystalline_sky/mixin/client/LevelRendererRenderSkyMixin.java

@@ -2,12 +2,17 @@ package io.github.slimeistdev.crystalline_sky.mixin.client;
 
 import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
 import com.llamalad7.mixinextras.injector.wrapoperation.WrapOperation;
+import com.mojang.blaze3d.platform.GlConst;
+import com.mojang.blaze3d.systems.RenderSystem;
 import io.github.slimeistdev.crystalline_sky.util.SharedRenderVariables;
+import net.minecraft.client.Minecraft;
 import net.minecraft.client.multiplayer.ClientLevel;
 import net.minecraft.client.renderer.LevelRenderer;
 import net.minecraft.world.level.LevelHeightAccessor;
 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;
 
 @Mixin(value = LevelRenderer.class, remap = false)
 public class LevelRendererRenderSkyMixin {
@@ -29,4 +34,17 @@ public class LevelRendererRenderSkyMixin {
 
 		return original.call(levelData, level);
 	}
+
+	@Inject(
+		method = "renderSky",
+		at = @At(
+			value = "INVOKE",
+			target = "Lnet/minecraft/client/multiplayer/ClientLevel;getStarBrightness(F)F"
+		)
+	)
+	private void crystalline_sky$clearDepthBeforeStars(CallbackInfo ci) {
+		if (SharedRenderVariables.isCapturingSkyBuffer()) {
+			RenderSystem.clear(GlConst.GL_DEPTH_BUFFER_BIT, Minecraft.ON_OSX);
+		}
+	}
 }

common/src/main/java/io/github/slimeistdev/crystalline_sky/mixin/client/compat/iris/FallbackShaderMixin.java

@@ -0,0 +1,22 @@
+package io.github.slimeistdev.crystalline_sky.mixin.client.compat.iris;
+
+import com.llamalad7.mixinextras.injector.wrapoperation.Operation;
+import com.llamalad7.mixinextras.injector.wrapoperation.WrapOperation;
+import io.github.slimeistdev.crystalline_sky.annotation.mixin.ConditionalMixin;
+import io.github.slimeistdev.crystalline_sky.compat.Mods;
+import io.github.slimeistdev.crystalline_sky.util.SharedRenderVariables;
+import net.irisshaders.iris.gl.framebuffer.GlFramebuffer;
+import net.irisshaders.iris.pipeline.programs.FallbackShader;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+
+@ConditionalMixin(mods = Mods.IRIS)
+@Mixin(FallbackShader.class)
+public class FallbackShaderMixin {
+	@WrapOperation(method = "apply", at = @At(value = "INVOKE", target = "Lnet/irisshaders/iris/gl/framebuffer/GlFramebuffer;bind()V"))
+	private void skipBind(GlFramebuffer instance, Operation<Void> original) {
+		if (!SharedRenderVariables.shouldBlockIrisShaderFramebufferBind()) {
+			original.call(instance);
+		}
+	}
+}

common/src/main/java/io/github/slimeistdev/crystalline_sky/mixin/client/compat/iris/SodiumProgramsMixin.java

@@ -4,6 +4,7 @@ import io.github.slimeistdev.crystalline_sky.annotation.mixin.ConditionalMixin;
 import io.github.slimeistdev.crystalline_sky.compat.Mods;
 import io.github.slimeistdev.crystalline_sky.mixin.client.compat.sodium.TerrainRenderPassAccessor;
 import io.github.slimeistdev.crystalline_sky.registry.client.CrystallineRenderTypes;
+import net.caffeinemc.mods.sodium.client.gl.shader.GlProgram;
 import net.caffeinemc.mods.sodium.client.render.chunk.terrain.TerrainRenderPass;
 import net.irisshaders.iris.pipeline.programs.SodiumPrograms;
 import net.irisshaders.iris.shadows.ShadowRenderingState;
@@ -23,4 +24,12 @@ public class SodiumProgramsMixin {
 			cir.setReturnValue(ShadowRenderingState.areShadowsCurrentlyBeingRendered() ? SodiumPrograms.Pass.SHADOW : SodiumPrograms.Pass.TERRAIN);
 		}
 	}
+
+	@Inject(method = "getProgram", at = @At("HEAD"), cancellable = true)
+	private void crystalline_sky$useCustomSkyShader(TerrainRenderPass pass, CallbackInfoReturnable<GlProgram<?>> cir) {
+		RenderType renderType = ((TerrainRenderPassAccessor) pass).crystalline_sky$getRenderLayer();
+		if (renderType == CrystallineRenderTypes.SKY || renderType == CrystallineRenderTypes.SKYBOX) {
+			cir.setReturnValue(null);
+		}
+	}
 }

common/src/main/java/io/github/slimeistdev/crystalline_sky/util/SharedRenderVariables.java

@@ -9,6 +9,19 @@ public class SharedRenderVariables {
 	public static final ThreadLocal<MutableInt> shadeFullBright = ThreadLocal.withInitial(() -> new MutableInt(0));
 	private static int blockIrisShaderFramebufferBind = 0;
 	private static int skipVoidSky = 0;
+	private static int capturingSkyBuffer = 0;
+
+	public static boolean isCapturingSkyBuffer() {
+		return capturingSkyBuffer > 0;
+	}
+
+	public static void pushCapturingSkyBuffer() {
+		capturingSkyBuffer++;
+	}
+
+	public static void popCapturingSkyBuffer() {
+		capturingSkyBuffer--;
+	}
 
 	public static boolean shouldShadeFullBright() {
 		return shadeFullBright.get().intValue() > 0;

common/src/main/resources/crystalline_sky-common.mixins.json

@@ -27,6 +27,7 @@
     "client.RenderTargetMixin",
     "client.TextureAtlasAccessor",
     "client.compat.iris.ExtendedShaderMixin",
+    "client.compat.iris.FallbackShaderMixin",
     "client.compat.iris.IrisRenderingPipelineAccessor",
     "client.compat.iris.IrisRenderingPipelineMixin",
     "client.compat.iris.SodiumProgramsMixin",