feat: 实现 D3D12Texture 和 D3D12Buffer 资源类

- 添加 D3D12Texture.h/cpp - 纹理资源封装
- 添加 D3D12Buffer.h/cpp - 缓冲区资源封装
- 支持 CreateCommittedResource 创建资源
- 测试通过

engine/src/RHI/D3D12Buffer.cpp

@@ -0,0 +1,60 @@
+#include "XCEngine/RHI/D3D12/D3D12Buffer.h"
+
+namespace XCEngine {
+namespace RHI {
+
+D3D12Buffer::D3D12Buffer() {
+}
+
+D3D12Buffer::~D3D12Buffer() {
+    Shutdown();
+}
+
+bool D3D12Buffer::Initialize(ID3D12Device* device, uint64_t size, D3D12_RESOURCE_STATES initialState) {
+    D3D12_HEAP_PROPERTIES heapProperties = {};
+    heapProperties.Type = D3D12_HEAP_TYPE_DEFAULT;
+    heapProperties.CPUPageProperty = D3D12_CPU_PAGE_PROPERTY_UNKNOWN;
+    heapProperties.MemoryPoolPreference = D3D12_MEMORY_POOL_UNKNOWN;
+    heapProperties.CreationNodeMask = 0;
+    heapProperties.VisibleNodeMask = 0;
+
+    D3D12_RESOURCE_DESC bufferDesc = {};
+    bufferDesc.Dimension = D3D12_RESOURCE_DIMENSION_BUFFER;
+    bufferDesc.Alignment = 0;
+    bufferDesc.Width = size;
+    bufferDesc.Height = 1;
+    bufferDesc.DepthOrArraySize = 1;
+    bufferDesc.MipLevels = 1;
+    bufferDesc.Format = DXGI_FORMAT_UNKNOWN;
+    bufferDesc.SampleDesc.Count = 1;
+    bufferDesc.SampleDesc.Quality = 0;
+    bufferDesc.Layout = D3D12_TEXTURE_LAYOUT_ROW_MAJOR;
+    bufferDesc.Flags = D3D12_RESOURCE_FLAG_NONE;
+
+    HRESULT hResult = device->CreateCommittedResource(
+        &heapProperties,
+        D3D12_HEAP_FLAG_NONE,
+        &bufferDesc,
+        initialState,
+        nullptr,
+        IID_PPV_ARGS(&m_resource)
+    );
+
+    if (FAILED(hResult)) {
+        return false;
+    }
+
+    return true;
+}
+
+bool D3D12Buffer::InitializeFromExisting(ID3D12Resource* resource) {
+    m_resource = resource;
+    return true;
+}
+
+void D3D12Buffer::Shutdown() {
+    m_resource.Reset();
+}
+
+} // namespace RHI
+} // namespace XCEngine

engine/src/RHI/D3D12Texture.cpp

@@ -0,0 +1,49 @@
+#include "XCEngine/RHI/D3D12/D3D12Texture.h"
+
+namespace XCEngine {
+namespace RHI {
+
+D3D12Texture::D3D12Texture() {
+}
+
+D3D12Texture::~D3D12Texture() {
+    Shutdown();
+}
+
+bool D3D12Texture::Initialize(ID3D12Device* device, const D3D12_RESOURCE_DESC& desc, D3D12_RESOURCE_STATES initialState) {
+    D3D12_HEAP_PROPERTIES heapProperties = {};
+    heapProperties.Type = D3D12_HEAP_TYPE_DEFAULT;
+    heapProperties.CPUPageProperty = D3D12_CPU_PAGE_PROPERTY_UNKNOWN;
+    heapProperties.MemoryPoolPreference = D3D12_MEMORY_POOL_UNKNOWN;
+    heapProperties.CreationNodeMask = 0;
+    heapProperties.VisibleNodeMask = 0;
+
+    D3D12_CLEAR_VALUE* pOptimizedClearValue = nullptr;
+
+    HRESULT hResult = device->CreateCommittedResource(
+        &heapProperties,
+        D3D12_HEAP_FLAG_NONE,
+        &desc,
+        initialState,
+        pOptimizedClearValue,
+        IID_PPV_ARGS(&m_resource)
+    );
+
+    if (FAILED(hResult)) {
+        return false;
+    }
+
+    return true;
+}
+
+bool D3D12Texture::InitializeFromExisting(ID3D12Resource* resource) {
+    m_resource = resource;
+    return true;
+}
+
+void D3D12Texture::Shutdown() {
+    m_resource.Reset();
+}
+
+} // namespace RHI
+} // namespace XCEngine