Make mixed samples contingent on auxiliary extensions

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 219 matching lines @@
 
     /// Is GL_ARB_fragment_coord_conventions supported?
     bool fragCoordConventionsSupport() const { return fFragCoordsConventionSupport; }
 
     /// Is there support for Vertex Array Objects?
     bool vertexArrayObjectSupport() const { return fVertexArrayObjectSupport; }
 
     /// Is there support for ES2 compatability?
     bool ES2CompatibilitySupport() const { return fES2CompatibilitySupport; }
 
+    /// Can we call glDisable(GL_MULTISAMPLE)?
+    bool multisampleDisableSupport() const { return fMultisampleDisableSupport; }
+
     /// Use indices or vertices in CPU arrays rather than VBOs for dynamic content.
     bool useNonVBOVertexAndIndexDynamicData() const {
         return fUseNonVBOVertexAndIndexDynamicData;
     }
 
     /// Does ReadPixels support the provided format/type combo?
     bool readPixelsSupported(const GrGLInterface* intf,
                              GrGLenum format,
                              GrGLenum type,
                              GrGLenum currFboFormat) const;
@@ skipping 96 matching lines @@
     bool fPackRowLengthSupport : 1;
     bool fPackFlipYSupport : 1;
     bool fTextureUsageSupport : 1;
     bool fTexStorageSupport : 1;
     bool fTextureRedSupport : 1;
     bool fImagingSupport  : 1;
     bool fTwoFormatLimit : 1;
     bool fFragCoordsConventionSupport : 1;
     bool fVertexArrayObjectSupport : 1;
     bool fES2CompatibilitySupport : 1;
+    bool fMultisampleDisableSupport : 1;
     bool fUseNonVBOVertexAndIndexDynamicData : 1;
     bool fIsCoreProfile : 1;
     bool fFullClearIsFree : 1;
     bool fFBMixedSamplesSupport : 1;
 
     struct ReadPixelsSupportedFormat {
         GrGLenum fFormat;
         GrGLenum fType;
         GrGLenum fFboFormat;
 
@@ skipping 89 matching lines @@
     const char* fFBFetchColorName;
     const char* fFBFetchExtensionString;
 
     AdvBlendEqInteraction fAdvBlendEqInteraction;
 
     typedef GrShaderCaps INHERITED;
 };
 
 
 #endif