[dxgi] Add GetDevice method to IDXGIVkInteropSurface

Convenient way of getting the IDXGIVkInteropDevice from the surface
without having to go through several D3D interface queries.

src/d3d11/d3d11_texture.cpp

@@ -320,6 +320,17 @@ namespace dxvk {
   }
   
   
+  HRESULT STDMETHODCALLTYPE D3D11VkInteropSurface::GetDevice(
+          IDXGIVkInteropDevice**  ppDevice) {
+    Com<ID3D11Device> device;
+    m_container->GetDevice(&device);
+    
+    return device->QueryInterface(
+      __uuidof(IDXGIVkInteropDevice),
+      reinterpret_cast<void**>(ppDevice));
+  }
+  
+  
   HRESULT STDMETHODCALLTYPE D3D11VkInteropSurface::GetVulkanImageInfo(
           VkImage*              pHandle,
           VkImageLayout*        pLayout,

src/d3d11/d3d11_texture.h

@@ -214,6 +214,9 @@ namespace dxvk {
             REFIID                  riid,
             void**                  ppvObject);
     
+    HRESULT STDMETHODCALLTYPE GetDevice(
+            IDXGIVkInteropDevice**  ppDevice);
+    
     HRESULT STDMETHODCALLTYPE GetVulkanImageInfo(
             VkImage*              pHandle,
             VkImageLayout*        pLayout,

src/dxgi/dxgi_interfaces.h

@@ -13,6 +13,7 @@ namespace dxvk {
   class DxvkImage;
 }
 
+class IDXGIVkInteropDevice;
 
 /**
  * \brief Private DXGI device interface
@@ -144,6 +145,17 @@ MIDL_INTERFACE("5546cf8c-77e7-4341-b05d-8d4d5000e77d")
 IDXGIVkInteropSurface : public IUnknown {
   static const GUID guid;
   
+  /**
+   * \brief Retrieves device interop interfaceSlots
+   * 
+   * Queries the device that owns the surface for
+   * the \ref IDXGIVkInteropDevice interface.
+   * \param [out] ppDevice The device interface
+   * \returns \c S_OK on success
+   */
+  virtual HRESULT STDMETHODCALLTYPE GetDevice(
+          IDXGIVkInteropDevice**  ppDevice) = 0;
+  
   /**
    * \brief Retrieves Vulkan image info
    *