Fix OpenGL device initialization and file shaders

tests/RHI/unit/test_device.cpp

@@ -11,21 +11,48 @@ TEST_P(RHITestFixture, Device_Initialize_Shutdown) {
     RHIDevice* device = RHIFactory::CreateRHIDevice(GetBackendType());
     ASSERT_NE(device, nullptr);
 
-    bool initResult = false;
-    if (GetBackendType() == RHIType::D3D12) {
-        RHIDeviceDesc desc = {};
-        desc.enableDebugLayer = true;
-        initResult = device->Initialize(desc);
-    } else if (GetBackendType() == RHIType::OpenGL) {
-        auto* oglDevice = static_cast<OpenGLDevice*>(device);
-        initResult = oglDevice->InitializeWithExistingWindow(GetWindowHandle());
-    }
+    RHIDeviceDesc desc = {};
+    desc.enableDebugLayer = true;
+    const bool initResult = device->Initialize(desc);
     ASSERT_TRUE(initResult);
 
     device->Shutdown();
     delete device;
 }
 
+TEST_P(RHITestFixture, Device_Initialize_OpenGLUnifiedPath_CanCreateSwapChain) {
+    if (GetBackendType() != RHIType::OpenGL) {
+        GTEST_SKIP() << "OpenGL-specific unified initialization verification";
+    }
+
+    auto* device = new OpenGLDevice();
+    ASSERT_NE(device, nullptr);
+
+    RHIDeviceDesc deviceDesc = {};
+    ASSERT_TRUE(device->Initialize(deviceDesc));
+
+    CommandQueueDesc queueDesc = {};
+    queueDesc.queueType = static_cast<uint32_t>(CommandQueueType::Direct);
+    RHICommandQueue* queue = device->CreateCommandQueue(queueDesc);
+    ASSERT_NE(queue, nullptr);
+
+    SwapChainDesc swapDesc = {};
+    swapDesc.windowHandle = GetWindowHandle();
+    swapDesc.width = 320;
+    swapDesc.height = 180;
+    RHISwapChain* swapChain = device->CreateSwapChain(swapDesc, queue);
+    ASSERT_NE(swapChain, nullptr);
+
+    swapChain->Present(0, 0);
+
+    swapChain->Shutdown();
+    delete swapChain;
+    queue->Shutdown();
+    delete queue;
+    device->Shutdown();
+    delete device;
+}
+
 TEST_P(RHITestFixture, Device_GetCapabilities_ReturnsValid) {
     const auto& caps = GetDevice()->GetCapabilities();