Add support for GL_*_shader_framebuffer_fetch

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 59 matching lines @@
          * Instead the texture is multisampled when bound to the FBO and then resolved automatically
          * when read. It also defines an alternate value for GL_MAX_SAMPLES (which we call
          * GR_GL_MAX_SAMPLES_IMG).
          */
         kES_IMG_MsToTexture_MSFBOType,
         /**
          * GL_EXT_multisampled_render_to_texture. Same as the IMG one above but uses the standard
          * GL_MAX_SAMPLES value.
          */
         kES_EXT_MsToTexture_MSFBOType,
+
+        kLast_MSFBOType = kES_EXT_MsToTexture_MSFBOType 
+    };
+
+    enum FBFetchType {
+        kNone_FBFetchType,
+        /** GL_EXT_shader_framebuffer_fetch */
+        kEXT_FBFetchType,
+        /** GL_NV_shader_framebuffer_fetch */
+        kNV_FBFetchType,
+
+        kLast_FBFetchType = kNV_FBFetchType,
     };
 
     enum CoverageAAType {
         /**
          * No coverage sample support
          */
         kNone_CoverageAAType,
 
         /**
          * GL_NV_framebuffer_multisample_coverage
@@ skipping 87 matching lines @@
 
     /**
      * Chooses a supported coverage mode based on a desired sample count. The
      * desired sample count is rounded up the next supported coverage sample
      * count unless a it is larger than the max in which case it is rounded
      * down. Once a coverage sample count is decided, the supported mode with
      * the fewest color samples is chosen.
      */
     const MSAACoverageMode& getMSAACoverageMode(int desiredSampleCount) const;
 
+    FBFetchType fbFetchType() const { return fFBFetchType; }
+
     /**
      * Prints the caps info using GrPrintf.
      */
     virtual void print() const SK_OVERRIDE;
 
     /**
      * 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.
      */
@@ skipping 119 matching lines @@
     // as a stencil attachment.
     SkTArray<VerifiedColorConfigs, true> fStencilVerifiedColorConfigs;
 
     int fMaxFragmentUniformVectors;
     int fMaxVertexAttributes;
 
     MSFBOType fMSFBOType;
     CoverageAAType fCoverageAAType;
     SkTDArray<MSAACoverageMode> fMSAACoverageModes;
 
+    FBFetchType fFBFetchType;
+
     bool fRGBA8RenderbufferSupport : 1;
     bool fBGRAFormatSupport : 1;
     bool fBGRAIsInternalFormat : 1;
     bool fTextureSwizzleSupport : 1;
     bool fUnpackRowLengthSupport : 1;
     bool fUnpackFlipYSupport : 1;
     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 fUseNonVBOVertexAndIndexDynamicData : 1;
     bool fIsCoreProfile : 1;
     bool fDiscardFBSupport : 1;
 
     typedef GrDrawTargetCaps INHERITED;
 };
 
 #endif