feat: 实现 D3D12RootSignature 根签名类

- 添加 D3D12RootSignature.h 头文件
- 实现 ID3D12RootSignature 封装
- 支持序列化根签名描述符
- 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/D3D12RootSignature.h
     include/XCEngine/RHI/D3D12/D3D12SwapChain.h
     include/XCEngine/RHI/D3D12/D3D12Fence.h
     include/XCEngine/RHI/D3D12/D3D12Screenshot.h
@@ -97,6 +98,7 @@ add_library(XCEngine STATIC
     src/RHI/D3D12CommandAllocator.cpp
     src/RHI/D3D12CommandList.cpp
     src/RHI/D3D12DescriptorHeap.cpp
+    src/RHI/D3D12RootSignature.cpp
     src/RHI/D3D12SwapChain.cpp
     src/RHI/D3D12Fence.cpp
     src/RHI/D3D12Screenshot.cpp

engine/include/XCEngine/RHI/D3D12/D3D12RootSignature.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <d3d12.h>
+#include <wrl/client.h>
+
+#include "../Enums.h"
+#include "D3D12Enum.h"
+
+using Microsoft::WRL::ComPtr;
+
+namespace XCEngine {
+namespace RHI {
+
+class D3D12RootSignature {
+public:
+    D3D12RootSignature();
+    ~D3D12RootSignature();
+
+    bool Initialize(ID3D12Device* device, const D3D12_ROOT_SIGNATURE_DESC& desc);
+    void Shutdown();
+
+    ID3D12RootSignature* GetRootSignature() const { return m_rootSignature.Get(); }
+
+private:
+    ComPtr<ID3D12RootSignature> m_rootSignature;
+};
+
+} // namespace RHI
+} // namespace XCEngine

engine/src/RHI/D3D12RootSignature.cpp

@@ -0,0 +1,41 @@
+#include "XCEngine/RHI/D3D12/D3D12RootSignature.h"
+
+namespace XCEngine {
+namespace RHI {
+
+D3D12RootSignature::D3D12RootSignature() {
+}
+
+D3D12RootSignature::~D3D12RootSignature() {
+    Shutdown();
+}
+
+bool D3D12RootSignature::Initialize(ID3D12Device* device, const D3D12_ROOT_SIGNATURE_DESC& desc) {
+    ID3DBlob* signature = nullptr;
+    ID3DBlob* error = nullptr;
+
+    HRESULT hResult = D3D12SerializeRootSignature(&desc, D3D_ROOT_SIGNATURE_VERSION_1, &signature, &error);
+    if (FAILED(hResult)) {
+        if (error) {
+            error->Release();
+        }
+        return false;
+    }
+
+    hResult = device->CreateRootSignature(0, signature->GetBufferPointer(), signature->GetBufferSize(), IID_PPV_ARGS(&m_rootSignature));
+    
+    signature->Release();
+    
+    if (FAILED(hResult)) {
+        return false;
+    }
+
+    return true;
+}
+
+void D3D12RootSignature::Shutdown() {
+    m_rootSignature.Reset();
+}
+
+} // namespace RHI
+} // namespace XCEngine