Add 3DGS D3D12 MVS bootstrap and PLY loader

MVS/3DGS-D3D12/include/XC3DGSD3D12/App.h

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+#pragma once
+
+#include <windows.h>
+
+#include <memory>
+#include <string>
+#include <vector>
+#include <wrl/client.h>
+
+#include "XC3DGSD3D12/GaussianPlyLoader.h"
+#include "XCEngine/RHI/RHIEnums.h"
+#include "XCEngine/RHI/RHITypes.h"
+#include "XCEngine/RHI/D3D12/D3D12CommandAllocator.h"
+#include "XCEngine/RHI/D3D12/D3D12Buffer.h"
+#include "XCEngine/RHI/D3D12/D3D12CommandList.h"
+#include "XCEngine/RHI/D3D12/D3D12CommandQueue.h"
+#include "XCEngine/RHI/D3D12/D3D12DescriptorHeap.h"
+#include "XCEngine/RHI/D3D12/D3D12Device.h"
+#include "XCEngine/RHI/D3D12/D3D12ResourceView.h"
+#include "XCEngine/RHI/D3D12/D3D12SwapChain.h"
+#include "XCEngine/RHI/D3D12/D3D12Texture.h"
+
+namespace XC3DGSD3D12 {
+
+class App {
+public:
+    App();
+    ~App();
+
+    bool Initialize(HINSTANCE instance, int showCommand);
+    int Run();
+    void SetFrameLimit(unsigned int frameLimit);
+    void SetGaussianScenePath(std::wstring scenePath);
+    void SetSummaryPath(std::wstring summaryPath);
+    const std::wstring& GetLastErrorMessage() const;
+
+private:
+    static constexpr int kBackBufferCount = 2;
+    static constexpr int kDefaultWidth = 1280;
+    static constexpr int kDefaultHeight = 720;
+
+    static LRESULT CALLBACK StaticWindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
+    LRESULT WindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
+
+    bool RegisterWindowClass(HINSTANCE instance);
+    bool CreateMainWindow(HINSTANCE instance, int showCommand);
+    bool LoadGaussianScene();
+    bool InitializeRhi();
+    bool InitializeGaussianGpuResources();
+    void ShutdownGaussianGpuResources();
+    void Shutdown();
+    void RenderFrame();
+
+    HWND m_hwnd = nullptr;
+    HINSTANCE m_instance = nullptr;
+    int m_width = kDefaultWidth;
+    int m_height = kDefaultHeight;
+    bool m_running = false;
+    bool m_isInitialized = false;
+    bool m_hasRenderedAtLeastOneFrame = false;
+    unsigned int m_frameLimit = 0;
+    unsigned int m_renderedFrameCount = 0;
+    std::wstring m_gaussianScenePath = L"room.ply";
+    std::wstring m_summaryPath;
+    std::wstring m_lastErrorMessage;
+    GaussianSplatRuntimeData m_gaussianSceneData;
+    XCEngine::RHI::D3D12Buffer m_gaussianPositionBuffer;
+    XCEngine::RHI::D3D12Buffer m_gaussianOtherBuffer;
+    XCEngine::RHI::D3D12Buffer m_gaussianShBuffer;
+    XCEngine::RHI::D3D12Texture m_gaussianColorTexture;
+    std::unique_ptr<XCEngine::RHI::D3D12ResourceView> m_gaussianPositionView;
+    std::unique_ptr<XCEngine::RHI::D3D12ResourceView> m_gaussianOtherView;
+    std::unique_ptr<XCEngine::RHI::D3D12ResourceView> m_gaussianShView;
+    std::unique_ptr<XCEngine::RHI::D3D12ResourceView> m_gaussianColorView;
+    std::vector<Microsoft::WRL::ComPtr<ID3D12Resource>> m_gaussianUploadBuffers;
+
+    XCEngine::RHI::D3D12Device m_device;
+    XCEngine::RHI::D3D12CommandQueue m_commandQueue;
+    XCEngine::RHI::D3D12SwapChain m_swapChain;
+    XCEngine::RHI::D3D12CommandAllocator m_commandAllocator;
+    XCEngine::RHI::D3D12CommandList m_commandList;
+    XCEngine::RHI::D3D12Texture m_depthStencil;
+    XCEngine::RHI::D3D12DescriptorHeap m_rtvHeap;
+    XCEngine::RHI::D3D12DescriptorHeap m_dsvHeap;
+    XCEngine::RHI::D3D12ResourceView m_rtvs[kBackBufferCount];
+    XCEngine::RHI::D3D12ResourceView m_dsv;
+};
+
+} // namespace XC3DGSD3D12

MVS/3DGS-D3D12/include/XC3DGSD3D12/GaussianPlyLoader.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+#include <filesystem>
+#include <string>
+#include <vector>
+
+namespace XC3DGSD3D12 {
+
+struct Float3 {
+    float x = 0.0f;
+    float y = 0.0f;
+    float z = 0.0f;
+};
+
+struct GaussianSplatRuntimeData {
+    static constexpr uint32_t kColorTextureWidth = 2048;
+    static constexpr uint32_t kPositionStride = sizeof(float) * 3;
+    static constexpr uint32_t kOtherStride = sizeof(uint32_t) + sizeof(float) * 3;
+    static constexpr uint32_t kColorStride = sizeof(float) * 4;
+    static constexpr uint32_t kShCoefficientCount = 15;
+    static constexpr uint32_t kShStride = sizeof(float) * 3 * 16;
+
+    uint32_t splatCount = 0;
+    uint32_t colorTextureWidth = kColorTextureWidth;
+    uint32_t colorTextureHeight = 0;
+    Float3 boundsMin = {};
+    Float3 boundsMax = {};
+    std::vector<std::byte> positionData;
+    std::vector<std::byte> otherData;
+    std::vector<std::byte> colorData;
+    std::vector<std::byte> shData;
+};
+
+bool LoadGaussianSceneFromPly(
+    const std::filesystem::path& filePath,
+    GaussianSplatRuntimeData& outData,
+    std::string& outErrorMessage);
+
+bool WriteGaussianSceneSummary(
+    const std::filesystem::path& filePath,
+    const GaussianSplatRuntimeData& data,
+    std::string& outErrorMessage);
+
+} // namespace XC3DGSD3D12