feat: 实现 D3D12SwapChain 交换链类

- 添加 D3D12SwapChain.h 头文件
- 实现 IDXGISwapChain3 封装
- 实现 Initialize、Present、Resize 等方法
- 测试通过

engine/CMakeLists.txt

@@ -89,6 +89,7 @@ add_library(XCEngine STATIC
     include/XCEngine/RHI/D3D12/D3D12CommandAllocator.h
     include/XCEngine/RHI/D3D12/D3D12CommandList.h
     include/XCEngine/RHI/D3D12/D3D12DescriptorHeap.h
+    include/XCEngine/RHI/D3D12/D3D12SwapChain.h
     include/XCEngine/RHI/D3D12/D3D12Fence.h
     include/XCEngine/RHI/D3D12/D3D12Screenshot.h
     src/RHI/D3D12Device.cpp
@@ -96,6 +97,7 @@ add_library(XCEngine STATIC
     src/RHI/D3D12CommandAllocator.cpp
     src/RHI/D3D12CommandList.cpp
     src/RHI/D3D12DescriptorHeap.cpp
+    src/RHI/D3D12SwapChain.cpp
     src/RHI/D3D12Fence.cpp
     src/RHI/D3D12Screenshot.cpp
 )

engine/include/XCEngine/RHI/D3D12/D3D12SwapChain.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <d3d12.h>
+#include <dxgi1_4.h>
+#include <wrl/client.h>
+
+#include "../Enums.h"
+#include "D3D12Enum.h"
+
+using Microsoft::WRL::ComPtr;
+
+namespace XCEngine {
+namespace RHI {
+
+class D3D12SwapChain {
+public:
+    D3D12SwapChain();
+    ~D3D12SwapChain();
+
+    bool Initialize(IDXGIFactory4* factory, ID3D12CommandQueue* commandQueue, HWND windowHandle, uint32_t width, uint32_t height, uint32_t bufferCount = 2);
+    void Shutdown();
+
+    uint32_t GetCurrentBackBufferIndex() const;
+    ID3D12Resource* GetBackBuffer(uint32_t index) const;
+    void Present(uint32_t syncInterval, uint32_t flags);
+    void Resize(uint32_t width, uint32_t height);
+
+    IDXGISwapChain3* GetSwapChain() const { return m_swapChain.Get(); }
+
+private:
+    ComPtr<IDXGISwapChain3> m_swapChain;
+    ComPtr<ID3D12CommandQueue> m_commandQueue;
+    HWND m_windowHandle;
+    uint32_t m_width;
+    uint32_t m_height;
+    uint32_t m_bufferCount;
+};
+
+} // namespace RHI
+} // namespace XCEngine

engine/src/RHI/D3D12SwapChain.cpp

@@ -0,0 +1,75 @@
+#include "XCEngine/RHI/D3D12/D3D12SwapChain.h"
+
+namespace XCEngine {
+namespace RHI {
+
+D3D12SwapChain::D3D12SwapChain()
+    : m_windowHandle(nullptr)
+    , m_width(0)
+    , m_height(0)
+    , m_bufferCount(2) {
+}
+
+D3D12SwapChain::~D3D12SwapChain() {
+    Shutdown();
+}
+
+bool D3D12SwapChain::Initialize(IDXGIFactory4* factory, ID3D12CommandQueue* commandQueue, HWND windowHandle, uint32_t width, uint32_t height, uint32_t bufferCount) {
+    DXGI_SWAP_CHAIN_DESC swapChainDesc = {};
+    swapChainDesc.BufferCount = bufferCount;
+    swapChainDesc.BufferDesc.Width = width;
+    swapChainDesc.BufferDesc.Height = height;
+    swapChainDesc.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+    swapChainDesc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
+    swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;
+    swapChainDesc.OutputWindow = windowHandle;
+    swapChainDesc.SampleDesc.Count = 1;
+    swapChainDesc.SampleDesc.Quality = 0;
+    swapChainDesc.Windowed = TRUE;
+
+    IDXGISwapChain* swapChain = nullptr;
+    HRESULT hResult = factory->CreateSwapChain(commandQueue, &swapChainDesc, &swapChain);
+    if (FAILED(hResult)) {
+        return false;
+    }
+
+    hResult = swapChain->QueryInterface(IID_PPV_ARGS(&m_swapChain));
+    if (FAILED(hResult)) {
+        return false;
+    }
+
+    m_commandQueue = commandQueue;
+    m_windowHandle = windowHandle;
+    m_width = width;
+    m_height = height;
+    m_bufferCount = bufferCount;
+
+    return true;
+}
+
+void D3D12SwapChain::Shutdown() {
+    m_swapChain.Reset();
+}
+
+uint32_t D3D12SwapChain::GetCurrentBackBufferIndex() const {
+    return m_swapChain->GetCurrentBackBufferIndex();
+}
+
+ID3D12Resource* D3D12SwapChain::GetBackBuffer(uint32_t index) const {
+    ID3D12Resource* resource = nullptr;
+    m_swapChain->GetBuffer(index, IID_PPV_ARGS(&resource));
+    return resource;
+}
+
+void D3D12SwapChain::Present(uint32_t syncInterval, uint32_t flags) {
+    m_swapChain->Present(syncInterval, flags);
+}
+
+void D3D12SwapChain::Resize(uint32_t width, uint32_t height) {
+    m_swapChain->ResizeBuffers(m_bufferCount, width, height, DXGI_FORMAT_R8G8B8A8_UNORM, 0);
+    m_width = width;
+    m_height = height;
+}
+
+} // namespace RHI
+} // namespace XCEngine