[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);
 }

host/platform/Windows/capture/DXGI/CMakeLists.txt

@@ -14,7 +14,7 @@ add_library(capture_DXGI STATIC
   src/pp/rgb24.c
 )
 
-add_definitions("-DCOBJMACROS -DINITGUID")
+add_definitions("-DCOBJMACROS -DINITGUID -DWIDL_C_INLINE_WRAPPERS")
 
 target_link_libraries(capture_DXGI
   lg_common

host/platform/Windows/capture/DXGI/src/backend.h

@@ -36,7 +36,11 @@ struct DXGICopyBackend
   const char * code;
 
   // create the copy backend
-  bool (*create)(unsigned textures);
+  bool (*create)(
+    void * ivshmemBase,
+    unsigned * alignSize,
+    unsigned frameBuffers,
+    unsigned textures);
 
   // configure the copy backend with the specified format
   bool (*configure)(
@@ -50,7 +54,10 @@ struct DXGICopyBackend
   void (*free)(void);
 
   // called just before the copy starts
-  bool (*preCopy)(ID3D11Texture2D * src, unsigned textureIndex);
+  bool (*preCopy)(ID3D11Texture2D * src,
+    unsigned textureIndex,
+    unsigned frameBufferIndex,
+    FrameBuffer * frameBuffer);
 
   // called to copy the full frame
   bool (*copyFull)(ID3D11Texture2D * src, unsigned textureIndex);
@@ -65,6 +72,9 @@ struct DXGICopyBackend
   // maps the copied frame into memory
   CaptureResult (*mapTexture)(unsigned textureIndex, void ** map);
 
+  // [optional] backend specific write into the FrameBuffer
+  CaptureResult (*writeFrame)(int textureIndex, FrameBuffer * frame);
+
   // unmaps the copied frame from memory
   void (*unmapTexture)(unsigned textureIndex);
 

host/platform/Windows/capture/DXGI/src/d3d11.c

@@ -43,7 +43,11 @@ struct D3D11Backend
 
 static struct D3D11Backend  * this = NULL;
 
-static bool d3d11_create(unsigned textures)
+static bool d3d11_create(
+  void     * ivshmemBase,
+  unsigned * alignSize,
+  unsigned   frameBuffers,
+  unsigned   textures)
 {
   DEBUG_ASSERT(!this);
   this = calloc(1,
@@ -128,7 +132,11 @@ static void d3d11_free(void)
   this = NULL;
 }
 
-static bool d3d11_preCopy(ID3D11Texture2D * src, unsigned textureIndex)
+static bool d3d11_preCopy(
+  ID3D11Texture2D * src,
+  unsigned          textureIndex,
+  unsigned          frameBufferIndex,
+  FrameBuffer     * frameBuffer)
 {
   dxgi_contextLock();
   this->texture[textureIndex].copyTime = microtime();