Add Vulkan RHI minimal backend path

tests/RHI/integration/fixtures/RHIIntegrationFixture.h

@@ -2,6 +2,7 @@
 
 #include <gtest/gtest.h>
 #include <string>
+#include <vector>
 #include <windows.h>
 
 #include "XCEngine/RHI/RHIFactory.h"
@@ -23,6 +24,10 @@
 #include "XCEngine/RHI/D3D12/D3D12DescriptorHeap.h"
 #endif
 
+#if defined(XCENGINE_SUPPORT_VULKAN)
+#include "XCEngine/RHI/Vulkan/VulkanSwapChain.h"
+#endif
+
 namespace XCEngine {
 namespace RHI {
 namespace Integration {
@@ -62,12 +67,12 @@ private:
     RHIScreenshot* mScreenshot = nullptr;
     HWND mWindow = nullptr;
     int mCurrentBackBufferIndex = 0;
+    std::vector<RHIResourceView*> mBackBufferViews;
 
 #if defined(XCENGINE_SUPPORT_D3D12)
     D3D12DescriptorHeap* mRTVHeap = nullptr;
     D3D12DescriptorHeap* mDSVHeap = nullptr;
     D3D12Texture* mDepthStencilTexture = nullptr;
-    std::vector<RHIResourceView*> mRTVs;
     RHIResourceView* mDSV = nullptr;
 #endif
 };