FBFetch refactor + arm support

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 50 matching lines @@
         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 InvalidateFBType {
         kNone_InvalidateFBType,
         kDiscard_InvalidateFBType,       //<! glDiscardFramebuffer()
         kInvalidate_InvalidateFBType,     //<! glInvalidateFramebuffer()
 
         kLast_InvalidateFBType = kInvalidate_InvalidateFBType
     };
 
     enum MapBufferType {
         kNone_MapBufferType,
@@ skipping 76 matching lines @@
 
     /**
      * Is the MSAA FBO extension one where the texture is multisampled when bound to an FBO and
      * then implicitly resolved when read.
      */
     bool usesImplicitMSAAResolve() const {
         return kES_IMG_MsToTexture_MSFBOType == fMSFBOType ||
                kES_EXT_MsToTexture_MSFBOType == fMSFBOType;
     }
 
-    FBFetchType fbFetchType() const { return fFBFetchType; }
+    /**
+     * Some helper functions for encapsulating various extensions to read FB Buffer on openglES
+     *
+     * TODO On desktop opengl 4.2+ we can achieve something similar to this effect
+     */
+    bool fbFetchSupport() const { return fFBFetchSupport; }
+
+    const char* fbFetchColorName() const { return fFBFetchColorName; }
+
+    const char* fbFetchExtensionString() const { return fFBFetchExtensionString; }
 
     InvalidateFBType invalidateFBType() const { return fInvalidateFBType; }
 
     /// What type of buffer mapping is supported?
     MapBufferType mapBufferType() const { return fMapBufferType; }
 
     /**
      * 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 145 matching lines @@
     // used as a color attachment when a particular stencil format is used
     // as a stencil attachment.
     SkTArray<VerifiedColorConfigs, true> fStencilVerifiedColorConfigs;
 
     int fMaxFragmentUniformVectors;
     int fMaxVertexAttributes;
     int fMaxFragmentTextureUnits;
     int fMaxFixedFunctionTextureCoords;
 
     MSFBOType           fMSFBOType;
-    FBFetchType         fFBFetchType;
     InvalidateFBType    fInvalidateFBType;
     MapBufferType       fMapBufferType;
     LATCAlias           fLATCAlias;
 
     bool fRGBA8RenderbufferSupport : 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 fFullClearIsFree : 1;
     bool fDropsTileOnZeroDivide : 1;
+    bool fFBFetchSupport : 1;
+
+    const char* fFBFetchColorName;
+    const char* fFBFetchExtensionString;
 
     typedef GrDrawTargetCaps INHERITED;
 };
 
 #endif