Add fence support for TransferBuffers

include/gpu/GrCaps.h

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef GrCaps_DEFINED
 #define GrCaps_DEFINED
 
@@ skipping 268 matching lines @@
     }
 
     bool fullClearIsFree() const { return fFullClearIsFree; }
 
     /** True in environments that will issue errors if memory uploaded to buffers
         is not initialized (even if not read by draw calls). */
     bool mustClearUploadedBufferData() const { return fMustClearUploadedBufferData; }
 
     bool sampleShadingSupport() const { return fSampleShadingSupport; }
 
+    bool fenceSyncSupport() const { return fFenceSyncSupport; }
+
 protected:
     /** Subclasses must call this at the end of their constructors in order to apply caps
         overrides requested by the client. Note that overrides will only reduce the caps never
         expand them. */
     void applyOptionsOverrides(const GrContextOptions& options);
 
     SkAutoTUnref<GrShaderCaps>    fShaderCaps;
 
     bool fNPOTTextureTileSupport                     : 1;
     bool fMipMapSupport                              : 1;
@@ skipping 18 matching lines @@
     // Driver workaround
     bool fUseDrawInsteadOfClear                      : 1;
     bool fUseDrawInsteadOfPartialRenderTargetWrite   : 1;
     bool fUseDrawInsteadOfAllRenderTargetWrites      : 1;
     bool fAvoidInstancedDrawsToFPTargets             : 1;
 
     // ANGLE workaround
     bool fPreferVRAMUseOverFlushes                   : 1;
 
     bool fSampleShadingSupport                       : 1;
+    // TODO: this may need to be an enum to support different fence types
+    bool fFenceSyncSupport                           : 1;
 
     InstancedSupport fInstancedSupport;
 
     BlendEquationSupport fBlendEquationSupport;
     uint32_t fAdvBlendEqBlacklist;
     GR_STATIC_ASSERT(kLast_GrBlendEquation < 32);
 
     uint32_t fMapBufferFlags;
     int fBufferMapThreshold;
 
     int fMaxRenderTargetSize;
     int fMaxVertexAttributes;
     int fMaxTextureSize;
     int fMaxTileSize;
     int fMaxColorSampleCount;
     int fMaxStencilSampleCount;
     int fMaxRasterSamples;
     int fMaxWindowRectangles;
 
 private:
     virtual void onApplyOptionsOverrides(const GrContextOptions&) {}
 
     bool fSuppressPrints : 1;
     bool fImmediateFlush: 1;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif