Fix UWP build

Source/Engine/GraphicsDevice/DirectX/DX11/GPUDeviceDX11.cpp

@@ -277,7 +277,9 @@ bool GPUDeviceDX11::Init()
             && GetModuleHandleA("renderdoc.dll") == nullptr // Disable tearing with RenderDoc (prevents crashing)
 #endif
         )
-            AllowTearing = true;
+        {
+            _allowTearing = true;
+        }
     }
 
     // Get flags and device type base on current configuration

Source/Engine/GraphicsDevice/DirectX/DX11/GPUDeviceDX11.h

@@ -20,7 +20,6 @@ class GPUDeviceDX11 : public GPUDeviceDX
 {
     friend GPUContextDX11;
     friend GPUSwapChainDX11;
-
 private:
 
     // Private Stuff
@@ -29,6 +28,7 @@ private:
     IDXGIFactory* _factoryDXGI;
 
     GPUContextDX11* _mainContext;
+    bool _allowTearing = false;
 
     // Static Samplers
     ID3D11SamplerState* _samplerLinearClamp;
@@ -45,15 +45,10 @@ private:
     ID3D11DepthStencilState* DepthStencilStates[9 * 2 * 2]; // Index = ComparisonFunc[0-8] + DepthTestEnable[0?9] + DepthWriteEnable[0?18]
 
 public:
-
     static GPUDevice* Create();
     GPUDeviceDX11(IDXGIFactory* dxgiFactory, GPUAdapterDX* adapter);
     ~GPUDeviceDX11();
 
-public:
-
-    bool AllowTearing = false;
-
 public:
 
     // Gets DX11 device
@@ -79,8 +74,6 @@ public:
         return _mainContext;
     }
 
-public:
-
     ID3D11BlendState* GetBlendState(const BlendingMode& blending);
 
 public:

Source/Engine/GraphicsDevice/DirectX/DX11/GPUSwapChainDX11.cpp

@@ -16,9 +16,11 @@ GPUSwapChainDX11::GPUSwapChainDX11(GPUDeviceDX11* device, Window* window)
     , _windowHandle(static_cast<IUnknown*>(window->GetNativePtr()))
 #endif
     , _swapChain(nullptr)
-    , _backBuffer(nullptr)
+#if PLATFORM_WINDOWS
     , _allowTearing(false)
     , _isFullscreen(false)
+#endif
+    , _backBuffer(nullptr)
 {
     ASSERT(_windowHandle);
     _window = window;
@@ -162,7 +164,7 @@ bool GPUSwapChainDX11::Resize(int32 width, int32 height)
     _device->WaitForGPU();
     GPUDeviceLock lock(_device);
 #if PLATFORM_WINDOWS
-    _allowTearing = _device->AllowTearing;
+    _allowTearing = _device->_allowTearing;
 #endif
     _format = GPU_BACK_BUFFER_PIXEL_FORMAT;