Fix RHI unit test failures and OpenGL backend issues

- Fix D3D12Texture::GetTextureType() to return correct type based on D3D12 resource dimension
- Fix OpenGL CommandQueue::Signal() to properly call fence->Signal()
- Fix OpenGL CommandQueue::GetTimestampFrequency() using GL_TIMESTAMP
- Fix OpenGL Device::GetNativeDevice() to return m_hglrc
- Fix OpenGL Fence::Signal() to create GL sync object and update completedValue
- Fix OpenGL Fence::Wait() to properly wait for fence
- Fix OpenGL Fence::GetNativeHandle() to create sync on first call
- Fix OpenGL SwapChain::GetCurrentBackBuffer() to return backbuffer texture
- Fix OpenGL SwapChain::Initialize() to create backbuffer texture
- Fix OpenGL SwapChain::Shutdown() to cleanup backbuffer texture
- Fix RHI unit tests: add missing sampleCount/sampleQuality/depth/arraySize fields
- Fix RHI unit tests: add complete TextureDesc fields where needed

engine/include/XCEngine/RHI/D3D12/D3D12Texture.h

@@ -44,7 +44,14 @@ public:
 
     uint32_t GetArraySize() const { return GetDesc().DepthOrArraySize; }
     Format GetFormat() const override { return static_cast<Format>(GetDesc().Format); }
-    TextureType GetTextureType() const override { return TextureType::Texture2D; }
+    TextureType GetTextureType() const override {
+        switch (GetDesc().Dimension) {
+            case D3D12_RESOURCE_DIMENSION_TEXTURE1D: return TextureType::Texture1D;
+            case D3D12_RESOURCE_DIMENSION_TEXTURE2D: return TextureType::Texture2D;
+            case D3D12_RESOURCE_DIMENSION_TEXTURE3D: return TextureType::Texture3D;
+            default: return TextureType::Texture2D;
+        }
+    }
 
     bool OwnsResource() const { return m_ownsResource; }
 

engine/include/XCEngine/RHI/OpenGL/OpenGLCommandQueue.h

@@ -19,7 +19,7 @@ public:
     void WaitForIdle() override;
 
     CommandQueueType GetType() const override { return CommandQueueType::Direct; }
-    uint64_t GetTimestampFrequency() const override { return 0; }
+    uint64_t GetTimestampFrequency() const override;
 
     void* GetNativeHandle() override { return nullptr; }
     void WaitForPreviousFrame() override {}

engine/include/XCEngine/RHI/OpenGL/OpenGLFence.h

@@ -31,7 +31,7 @@ public:
     uint64_t GetCompletedValue() const override;
     uint64_t GetCurrentValue() const { return m_fenceValue; }
 
-    void* GetNativeHandle() override { return m_sync; }
+    void* GetNativeHandle() override;
 
 private:
     void* m_sync;

engine/include/XCEngine/RHI/OpenGL/OpenGLSwapChain.h

@@ -3,6 +3,7 @@
 #include <cstdint>
 
 #include "../RHISwapChain.h"
+#include "OpenGLTexture.h"
 
 struct HWND__;
 struct HDC__;
@@ -72,6 +73,7 @@ private:
     bool m_shouldClose;
     bool m_fullscreen;
     PresentMode m_presentMode;
+    OpenGLTexture* m_backBufferTexture;
 };
 
 } // namespace RHI