[host] dxgi: d3d12 now writes direclty into ivshmem

This is still incomplete as d3d12 doesn't have any proper sync with the
captured frame and as such is still not suggested for general usage. This
change though is monumental for this project as it removes a full memory
copy reducing bandwidth consumption enormously.

host/include/interface/capture.h

@@ -116,17 +116,18 @@ typedef struct CaptureInterface
   void         (*initOptions    )(void);
 
   bool(*create)(
+    void                   * ivshmemBase,
     CaptureGetPointerBuffer  getPointerBufferFn,
     CapturePostPointerBuffer postPointerBufferFn
   );
 
-  bool          (*init         )(void);
+  bool          (*init         )(unsigned * alignSize);
   bool          (*start        )(void);
   void          (*stop         )(void);
   bool          (*deinit       )(void);
   void          (*free         )(void);
 
-  CaptureResult (*capture   )(void);
+  CaptureResult (*capture   )(unsigned frameBufferIndex, FrameBuffer * frame);
   CaptureResult (*waitFrame )(CaptureFrame * frame, const size_t maxFrameSize);
   CaptureResult (*getFrame  )(FrameBuffer  * frame, int frameIndex);
 }