Add GPU sorting for gaussian splat rendering

engine/include/XCEngine/Rendering/Passes/BuiltinGaussianSplatPass.h

@@ -211,7 +211,8 @@ private:
 
     enum class PassLayoutUsage : Core::uint8 {
         Draw,
-        PrepareOrder
+        PrepareOrder,
+        BitonicSort
     };
 
     bool EnsureInitialized(const RenderContext& context);
@@ -224,6 +225,7 @@ private:
         const RenderSceneData& sceneData,
         const Resources::Material* material) const;
     ResolvedShaderPass ResolvePrepareOrderShaderPass(const RenderSceneData& sceneData) const;
+    ResolvedShaderPass ResolveBitonicSortShaderPass(const RenderSceneData& sceneData) const;
     PassResourceLayout* GetOrCreatePassResourceLayout(
         const RenderContext& context,
         const ResolvedShaderPass& resolvedShaderPass,
@@ -235,7 +237,9 @@ private:
         const Resources::Material* material);
     RHI::RHIPipelineState* GetOrCreateComputePipelineState(
         const RenderContext& context,
-        const RenderSceneData& sceneData);
+        const ResolvedShaderPass& resolvedShaderPass,
+        PassLayoutUsage usage,
+        const Resources::ShaderKeywordSet& keywordSet);
     bool CreateOwnedDescriptorSet(
         const BuiltinPassSetLayoutMetadata& setLayout,
         OwnedDescriptorSet& descriptorSet);
@@ -259,6 +263,10 @@ private:
         const RenderContext& context,
         const RenderSceneData& sceneData,
         const VisibleGaussianSplatItem& visibleGaussianSplat);
+    bool SortVisibleGaussianSplat(
+        const RenderContext& context,
+        const RenderSceneData& sceneData,
+        const VisibleGaussianSplatItem& visibleGaussianSplat);
     bool DrawVisibleGaussianSplat(
         const RenderContext& context,
         const RenderSurface& surface,