Add material render state and pipeline caching

engine/include/XCEngine/Rendering/Pipelines/BuiltinForwardPipeline.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <XCEngine/Rendering/RenderMaterialUtility.h>
 #include <XCEngine/Rendering/RenderPipeline.h>
 #include <XCEngine/Rendering/RenderResourceCache.h>
 
@@ -11,6 +12,8 @@
 #include <XCEngine/RHI/RHISampler.h>
 #include <XCEngine/RHI/RHITexture.h>
 
+#include <unordered_map>
+
 namespace XCEngine {
 namespace Resources {
 class Material;
@@ -44,6 +47,9 @@ private:
     bool EnsureInitialized(const RenderContext& context);
     bool CreatePipelineResources(const RenderContext& context);
     void DestroyPipelineResources();
+    RHI::RHIPipelineState* GetOrCreatePipelineState(
+        const RenderContext& context,
+        const Resources::Material* material);
 
     const Resources::Texture* ResolveTexture(const Resources::Material* material) const;
     RHI::RHIResourceView* ResolveTextureView(const VisibleRenderItem& visibleItem);
@@ -65,7 +71,7 @@ private:
     RHI::RHIDescriptorPool* m_samplerPool = nullptr;
     RHI::RHIDescriptorSet* m_samplerSet = nullptr;
     RHI::RHIPipelineLayout* m_pipelineLayout = nullptr;
-    RHI::RHIPipelineState* m_pipelineState = nullptr;
+    std::unordered_map<Resources::MaterialRenderState, RHI::RHIPipelineState*, MaterialRenderStateHash> m_pipelineStates;
     RHI::RHISampler* m_sampler = nullptr;
     RHI::RHITexture* m_fallbackTexture = nullptr;
     RHI::RHIResourceView* m_fallbackTextureView = nullptr;