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/OpenGLFence.cpp

@@ -38,26 +38,22 @@ void OpenGLFence::Signal() {
 void OpenGLFence::Signal(uint64_t value) {
     glFlush();
     m_fenceValue = value;
+    m_completedValue = value;
     m_signaled = true;
+    if (m_sync) {
+        glDeleteSync(static_cast<GLsync>(m_sync));
+    }
+    m_sync = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
 }
 
 void OpenGLFence::Wait(uint64_t timeoutNs) {
-    if (!m_signaled || !m_sync) {
-        glFinish();
-        m_completedValue = m_fenceValue;
-        m_signaled = true;
-        return;
-    }
-
-    GLsync sync = static_cast<GLsync>(m_sync);
-    GLenum result = glClientWaitSync(sync, GL_SYNC_FLUSH_COMMANDS_BIT, timeoutNs);
-    while (result == GL_TIMEOUT_EXPIRED && timeoutNs > 0) {
-        result = glClientWaitSync(sync, 0, timeoutNs);
-    }
-
-    if (result == GL_ALREADY_SIGNALED || result == GL_CONDITION_SATISFIED) {
-        m_completedValue = m_fenceValue;
+    if (m_signaled && m_sync) {
+        GLsync sync = static_cast<GLsync>(m_sync);
+        glClientWaitSync(sync, GL_SYNC_FLUSH_COMMANDS_BIT, GL_TIMEOUT_IGNORED);
     }
+    glFinish();
+    m_completedValue = m_fenceValue;
+    m_signaled = true;
 }
 
 void OpenGLFence::Reset() {
@@ -91,5 +87,12 @@ uint64_t OpenGLFence::GetCompletedValue() const {
     return m_completedValue;
 }
 
+void* OpenGLFence::GetNativeHandle() {
+    if (!m_sync) {
+        m_sync = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
+    }
+    return m_sync;
+}
+
 } // namespace RHI
 } // namespace XCEngine