From f85bc7ae98486b37518958e659f659f1ff9b125c Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Fri, 21 Jan 2022 10:17:39 -0800
Subject: GFX: seperated ShaderTable. (#2090)

---
 tools/gfx/renderer-shared.h | 50 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

(limited to 'tools/gfx/renderer-shared.h')

diff --git a/tools/gfx/renderer-shared.h b/tools/gfx/renderer-shared.h
index 33d51e9ad..6baade085 100644
--- a/tools/gfx/renderer-shared.h
+++ b/tools/gfx/renderer-shared.h
@@ -39,6 +39,7 @@ struct GfxGUID
     static const Slang::Guid IID_IQueryPool;
     static const Slang::Guid IID_IAccelerationStructure;
     static const Slang::Guid IID_IFence;
+    static const Slang::Guid IID_IShaderTable;
 };
 
 // We use a `BreakableReference` to avoid the cyclic reference situation in gfx implementation.
@@ -1186,7 +1187,7 @@ public:
     }
 public:
     SLANG_COM_OBJECT_IUNKNOWN_ALL
-        ITransientResourceHeap* getInterface(const Slang::Guid& guid)
+    ITransientResourceHeap* getInterface(const Slang::Guid& guid)
     {
         if (guid == GfxGUID::IID_ISlangUnknown || guid == GfxGUID::IID_ITransientResourceHeap)
             return static_cast<ITransientResourceHeap*>(this);
@@ -1194,6 +1195,48 @@ public:
     }
 };
 
+class ShaderTableBase
+    : public IShaderTable
+    , public Slang::ComObject
+{
+public:
+    Slang::List<Slang::String> m_entryPointNames;
+    uint32_t m_rayGenShaderCount;
+    uint32_t m_missShaderCount;
+    uint32_t m_hitGroupCount;
+
+    Slang::Dictionary<PipelineStateBase*, Slang::RefPtr<BufferResource>> m_deviceBuffers;
+
+    SLANG_COM_OBJECT_IUNKNOWN_ALL
+    IShaderTable* getInterface(const Slang::Guid& guid)
+    {
+        if (guid == GfxGUID::IID_ISlangUnknown || guid == GfxGUID::IID_IShaderTable)
+            return static_cast<IShaderTable*>(this);
+        return nullptr;
+    }
+
+    virtual Slang::RefPtr<BufferResource> createDeviceBuffer(
+        PipelineStateBase* pipeline,
+        TransientResourceHeapBase* transientHeap,
+        IResourceCommandEncoder* encoder) = 0;
+
+    BufferResource* getOrCreateBuffer(
+        PipelineStateBase* pipeline,
+        TransientResourceHeapBase* transientHeap,
+        IResourceCommandEncoder* encoder)
+    {
+        if (auto ptr = m_deviceBuffers.TryGetValue(pipeline))
+        {
+            return ptr->Ptr();
+        }
+        auto result = createDeviceBuffer(pipeline, transientHeap, encoder);
+        m_deviceBuffers[pipeline] = result;
+        return result;
+    }
+
+    Result init(const IShaderTable::Desc& desc);
+};
+
 // Renderer implementation shared by all platforms.
 // Responsible for shader compilation, specialization and caching.
 class RendererBase : public IDevice, public Slang::ComObject
@@ -1254,6 +1297,11 @@ public:
         const IAccelerationStructure::CreateDesc& desc,
         IAccelerationStructure** outView) override;
 
+    // Provides a default implementation that returns SLANG_E_NOT_AVAILABLE for platforms
+    // without ray tracing support.
+    virtual SLANG_NO_THROW Result SLANG_MCALL
+        createShaderTable(const IShaderTable::Desc& desc, IShaderTable** outTable) override;
+
     // Provides a default implementation that returns SLANG_E_NOT_AVAILABLE for platforms
     // without ray tracing support.
     virtual SLANG_NO_THROW Result SLANG_MCALL createRayTracingPipelineState(
-- 
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