Implement support for mixed sampled render targets

src/gpu/gl/GrGLRenderTarget.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrGLRenderTarget_DEFINED
 #define GrGLRenderTarget_DEFINED
 
 #include "GrGLIRect.h"
 #include "GrRenderTarget.h"
 #include "SkScalar.h"
 
 class GrGLGpu;
 
 class GrGLRenderTarget : public GrRenderTarget {
 public:
     // set fTexFBOID to this value to indicate that it is multisampled but
     // Gr doesn't know how to resolve it.
     enum { kUnresolvableFBOID = 0 };
 
     struct IDDesc {
-        GrGLuint                    fRTFBOID;
-        GrGLuint                    fTexFBOID;
-        GrGLuint                    fMSColorRenderbufferID;
-        GrGpuResource::LifeCycle    fLifeCycle;
+        GrGLuint                     fRTFBOID;
+        GrGLuint                     fTexFBOID;
+        GrGLuint                     fMSColorRenderbufferID;
+        GrGpuResource::LifeCycle     fLifeCycle;
+        GrRenderTarget::SampleConfig fSampleConfig;
     };
 
     GrGLRenderTarget(GrGLGpu*, const GrSurfaceDesc&, const IDDesc&);
 
     void setViewport(const GrGLIRect& rect) { fViewport = rect; }
     const GrGLIRect& getViewport() const { return fViewport; }
 
     // The following two functions return the same ID when a
     // texture/render target is multisampled, and different IDs when
     // it is.
@@ skipping 48 matching lines @@
     GrGLIRect fViewport;
 
     // onGpuMemorySize() needs to know the VRAM footprint of the FBO(s). However, abandon and
     // release zero out the IDs and the cache needs to know the size even after those actions.
     size_t fGpuMemorySize;
 
     typedef GrRenderTarget INHERITED;
 };
 
 #endif