Add transfer buffer to GLCaps

src/gpu/gl/GrGLCaps.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrGLCaps_DEFINED
 #define GrGLCaps_DEFINED
@@ skipping 72 matching lines @@
 
     enum MapBufferType {
         kNone_MapBufferType,
         kMapBuffer_MapBufferType,         // glMapBuffer()
         kMapBufferRange_MapBufferType,    // glMapBufferRange()
         kChromium_MapBufferType,          // GL_CHROMIUM_map_sub
 
         kLast_MapBufferType = kChromium_MapBufferType,
     };
 
+    enum TransferBufferType {
+        kNone_TransferBufferType,
+        kPBO_TransferBufferType,          // ARB_pixel_buffer_object
+        kChromium_TransferBufferType,     // CHROMIUM_pixel_transfer_buffer_object
+
+        kLast_TransferBufferType = kChromium_TransferBufferType,
+    };
+
     /**
      * Initializes the GrGLCaps to the set of features supported in the current
      * OpenGL context accessible via ctxInfo.
      */
     GrGLCaps(const GrContextOptions& contextOptions, const GrGLContextInfo& ctxInfo,
              const GrGLInterface* glInterface);
 
     /**
      * Call to note that a color config has been verified as a valid color
      * attachment. This may save future calls to glCheckFramebufferStatus
@@ skipping 33 matching lines @@
     bool usesImplicitMSAAResolve() const {
         return kES_IMG_MsToTexture_MSFBOType == fMSFBOType ||
                kES_EXT_MsToTexture_MSFBOType == fMSFBOType;
     }
 
     InvalidateFBType invalidateFBType() const { return fInvalidateFBType; }
 
     /// What type of buffer mapping is supported?
     MapBufferType mapBufferType() const { return fMapBufferType; }
 
+    /// What type of transfer buffer is supported?
+    TransferBufferType transferBufferType() const { return fTransferBufferType; }
+
     /**
      * Gets an array of legal stencil formats. These formats are not guaranteed
      * to be supported by the driver but are legal GLenum names given the GL
      * version and extensions supported.
      */
     const SkTArray<StencilFormat, true>& stencilFormats() const {
         return fStencilFormats;
     }
 
     /// The maximum number of fragment uniform vectors (GLES has min. 16).
@@ skipping 174 matching lines @@
 
     SkTArray<StencilFormat, true> fStencilFormats;
 
     int fMaxFragmentUniformVectors;
     int fMaxVertexAttributes;
     int fMaxFragmentTextureUnits;
 
     MSFBOType           fMSFBOType;
     InvalidateFBType    fInvalidateFBType;
     MapBufferType       fMapBufferType;
+    TransferBufferType  fTransferBufferType;
     LATCAlias           fLATCAlias;
 
     bool fRGBA8RenderbufferSupport : 1;
     bool fBGRAIsInternalFormat : 1;
     bool fUnpackRowLengthSupport : 1;
     bool fUnpackFlipYSupport : 1;
     bool fPackRowLengthSupport : 1;
     bool fPackFlipYSupport : 1;
     bool fTextureUsageSupport : 1;
     bool fTexStorageSupport : 1;
@@ skipping 25 matching lines @@
                 && fType      == rhs.fType
                 && fFboFormat == rhs.fFboFormat;
         }
     };
     mutable SkTHashMap<ReadPixelsSupportedFormat, bool> fReadPixelsSupportedCache;
 
     typedef GrCaps INHERITED;
 };
 
 #endif