Implement ODS rendering via Iris Shader for MC 1.17

src/main/java/com/replaymod/render/mixin/Mixin_AddIrisOdsShaderUniforms.java

@@ -0,0 +1,27 @@
+//#if MC>=11600
+package com.replaymod.render.mixin;
+
+import com.replaymod.render.capturer.IrisODSFrameCapturer;
+import net.coderbot.iris.gl.uniform.UniformHolder;
+import net.coderbot.iris.gl.uniform.UniformUpdateFrequency;
+import net.coderbot.iris.uniforms.CommonUniforms;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Pseudo;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.ModifyVariable;
+
+@Pseudo
+@Mixin(value = CommonUniforms.class, remap = false)
+public class Mixin_AddIrisOdsShaderUniforms {
+    // Using ModifyVariable, so we only depend on a single argument. Hoping that reduces the chance of breaking changes.
+    @ModifyVariable(method = "generalCommonUniforms", at = @At("HEAD"), argsOnly = true)
+    private static UniformHolder addReplayModOdsUniforms(UniformHolder uniforms) {
+        IrisODSFrameCapturer ods = IrisODSFrameCapturer.INSTANCE;
+        if (ods != null) {
+            uniforms.uniform1b(UniformUpdateFrequency.PER_FRAME, "leftEye", ods::isLeftEye);
+            uniforms.uniform1i(UniformUpdateFrequency.PER_FRAME, "direction", ods::getDirection);
+        }
+        return uniforms;
+    }
+}
+//#endif

src/main/java/com/replaymod/render/mixin/Mixin_LoadIrisOdsShaderPack.java

@@ -0,0 +1,29 @@
+//#if MC>=11600
+package com.replaymod.render.mixin;
+
+import com.replaymod.render.capturer.IrisODSFrameCapturer;
+import net.coderbot.iris.Iris;
+import net.fabricmc.loader.api.FabricLoader;
+import org.objectweb.asm.Opcodes;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Pseudo;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+import java.nio.file.Path;
+
+@Pseudo
+@Mixin(value = Iris.class, remap = false)
+public class Mixin_LoadIrisOdsShaderPack {
+    @Redirect(method = "loadExternalShaderpack", at = @At(value = "FIELD", opcode = Opcodes.GETSTATIC, target = "Lnet/coderbot/iris/Iris;SHADERPACKS_DIRECTORY:Ljava/nio/file/Path;"))
+    private static Path loadReplayModOdsPack(String name) {
+        if (IrisODSFrameCapturer.INSTANCE != null && IrisODSFrameCapturer.SHADER_PACK_NAME.equals(name)) {
+            return FabricLoader.getInstance().getModContainer("replaymod")
+                    .orElseThrow(() -> new RuntimeException("Failed to get mod container for ReplayMod"))
+                    .getRootPath();
+        } else {
+            return Iris.SHADERPACKS_DIRECTORY;
+        }
+    }
+}
+//#endif