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/src/RHI/OpenGL/OpenGLCommandQueue.cpp

@@ -1,4 +1,6 @@
 #include "XCEngine/RHI/OpenGL/OpenGLCommandQueue.h"
+#include "XCEngine/RHI/RHIFence.h"
+#include <glad/glad.h>
 
 namespace XCEngine {
 namespace RHI {
@@ -17,6 +19,10 @@ void OpenGLCommandQueue::ExecuteCommandLists(uint32_t count, void** lists) {
 }
 
 void OpenGLCommandQueue::Signal(RHIFence* fence, uint64_t value) {
+    if (fence) {
+        fence->Signal(value);
+    }
+    glFlush();
 }
 
 void OpenGLCommandQueue::Wait(RHIFence* fence, uint64_t value) {
@@ -27,6 +33,13 @@ uint64_t OpenGLCommandQueue::GetCompletedValue() {
 }
 
 void OpenGLCommandQueue::WaitForIdle() {
+    glFinish();
+}
+
+uint64_t OpenGLCommandQueue::GetTimestampFrequency() const {
+    GLint64 frequency = 0;
+    glGetInteger64v(GL_TIMESTAMP, &frequency);
+    return frequency > 0 ? static_cast<uint64_t>(frequency) : 1000000000;
 }
 
 } // namespace RHI