Fix RHI D3D12 RTV creation and GetFormat bug

1. Add ALLOW_RENDER_TARGET flag for color textures in CreateTexture
   - This was the root cause of 5 failing RTV-related tests
   - Without this flag, creating RTV caused device removal

2. Add FromD3D12() reverse conversion for Format enum
   - GetFormat() was incorrectly casting DXGI_FORMAT to Format
   - DXGI_FORMAT_R8G8B8A8_UNORM=28 but Format::R8G8B8A8_UNorm=3
   - Added FromD3D12() to properly convert back

3. Update RHITestFixture to pre-create CommandQueue and Fence
   - Prevents potential timing issues with GPU synchronization

4. Update RHITestFixture tests to pass correct format in ResourceViewDesc
   - Previously passed empty desc.format=0 which caused issues

All 234 RHI unit tests now pass (117 D3D12 + 117 OpenGL)

tests/RHI/unit/fixtures/RHITestFixture.cpp

@@ -4,6 +4,9 @@
 #include <windows.h>
 
 #include "XCEngine/RHI/D3D12/D3D12Device.h"
+#include "XCEngine/RHI/D3D12/D3D12CommandQueue.h"
+#include "XCEngine/RHI/D3D12/D3D12CommandAllocator.h"
+#include "XCEngine/RHI/D3D12/D3D12CommandList.h"
 #include "XCEngine/RHI/OpenGL/OpenGLDevice.h"
 
 namespace XCEngine {
@@ -37,57 +40,54 @@ void RHITestFixture::SetUp() {
         RHIDeviceDesc desc = {};
         desc.enableDebugLayer = false;
         initResult = mDevice->Initialize(desc);
-    } else if (GetParam() == RHIType::OpenGL) {
-        auto* oglDevice = static_cast<OpenGLDevice*>(mDevice);
-        initResult = oglDevice->InitializeWithExistingWindow(mWindow);
-    }
-    ASSERT_TRUE(initResult);
-}
+        ASSERT_TRUE(initResult);
 
-void RHITestFixture::WaitForGPU() {
-    if (mDevice == nullptr) {
-        return;
-    }
-
-    if (GetParam() == RHIType::D3D12) {
-        auto* device = static_cast<D3D12Device*>(mDevice);
-        
         CommandQueueDesc queueDesc = {};
         queueDesc.queueType = static_cast<uint32_t>(CommandQueueType::Direct);
         queueDesc.priority = 0;
         queueDesc.nodeMask = 0;
         queueDesc.flags = 0;
-        auto* commandQueue = device->CreateCommandQueue(queueDesc);
-        if (commandQueue) {
-            FenceDesc fenceDesc = {};
-            fenceDesc.initialValue = 0;
-            fenceDesc.flags = 0;
-            auto* fence = mDevice->CreateFence(fenceDesc);
-            if (fence) {
-                commandQueue->Signal(fence, 1);
-                fence->Wait(1);
-                
-                for (int i = 0; i < 100; i++) {
-                    if (fence->GetCompletedValue() >= 1) {
-                        break;
-                    }
-                    Sleep(10);
-                }
-                
-                fence->Shutdown();
-                delete fence;
-            }
-            commandQueue->Shutdown();
-            delete commandQueue;
-        }
-        
-        Sleep(100);
+        mCommandQueue = mDevice->CreateCommandQueue(queueDesc);
+        ASSERT_NE(mCommandQueue, nullptr);
+
+        FenceDesc fenceDesc = {};
+        fenceDesc.initialValue = 0;
+        fenceDesc.flags = 0;
+        mFence = mDevice->CreateFence(fenceDesc);
+        ASSERT_NE(mFence, nullptr);
+        mFenceValue = 0;
+    } else if (GetParam() == RHIType::OpenGL) {
+        auto* oglDevice = static_cast<OpenGLDevice*>(mDevice);
+        initResult = oglDevice->InitializeWithExistingWindow(mWindow);
+        ASSERT_TRUE(initResult);
+    }
+}
+
+void RHITestFixture::WaitForGPU() {
+    if (mDevice == nullptr || mCommandQueue == nullptr || mFence == nullptr) {
+        return;
+    }
+
+    if (GetParam() == RHIType::D3D12) {
+        mFenceValue++;
+        mCommandQueue->Signal(mFence, mFenceValue);
+        mFence->Wait(mFenceValue);
     }
 }
 
 void RHITestFixture::TearDown() {
     WaitForGPU();
 
+    if (mFence != nullptr) {
+        mFence->Shutdown();
+        delete mFence;
+        mFence = nullptr;
+    }
+    if (mCommandQueue != nullptr) {
+        mCommandQueue->Shutdown();
+        delete mCommandQueue;
+        mCommandQueue = nullptr;
+    }
     if (mDevice != nullptr) {
         mDevice->Shutdown();
         delete mDevice;

tests/RHI/unit/fixtures/RHITestFixture.h

@@ -37,6 +37,9 @@ protected:
 private:
     RHIDevice* mDevice = nullptr;
     HWND mWindow = nullptr;
+    RHICommandQueue* mCommandQueue = nullptr;
+    RHIFence* mFence = nullptr;
+    uint64_t mFenceValue = 0;
 };
 
 } // namespace RHI