Initial version of external_oes texture support and unit test

src/gpu/glsl/GrGLSLFragmentShaderBuilder.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLSLFragmentShaderBuilder_DEFINED
 #define GrGLSLFragmentShaderBuilder_DEFINED
 
@@ skipping 15 matching lines @@
         , fHasSecondaryOutput(false) {
         fSubstageIndices.push_back(0);
     }
     virtual ~GrGLSLFragmentBuilder() {}
     /**
      * Use of these features may require a GLSL extension to be enabled. Shaders may not compile
      * if code is added that uses one of these features without calling enableFeature()
      */
     enum GLSLFeature {
         kStandardDerivatives_GLSLFeature = 0,
+        kExternalSampler_GLSLFeature = 1,

[egdaniel, 2015/11/20 21:57:43]

is this public feature enum needed?

[bsalomon, 2015/11/20 22:43:55]

Done.

         kLastGLSLFeature = kStandardDerivatives_GLSLFeature
     };
 
     /**
      * If the feature is supported then true is returned and any necessary #extension declarations
      * are added to the shaders. If the feature is not supported then false will be returned.
      */
     virtual bool enableFeature(GLSLFeature) = 0;
 
     /**
@@ skipping 119 matching lines @@
 
     void onFinalize() override;
 
     /**
      * Features that should only be enabled by GrGLSLFragmentShaderBuilder itself.
      */
     enum GLSLPrivateFeature {
         kFragCoordConventions_GLSLPrivateFeature = kLastGLSLFeature + 1,
         kBlendEquationAdvanced_GLSLPrivateFeature,
         kBlendFuncExtended_GLSLPrivateFeature,
+        kExternalTexture_GLSLPrivateFeature,
         kLastGLSLPrivateFeature = kBlendFuncExtended_GLSLPrivateFeature
     };
 
     // Interpretation of FragPosKey when generating code
     enum {
         kNoFragPosRead_FragPosKey           = 0,  // The fragment positition will not be needed.
         kTopLeftFragPosRead_FragPosKey      = 0x1,// Read frag pos relative to top-left.
         kBottomLeftFragPosRead_FragPosKey   = 0x2,// Read frag pos relative to bottom-left.
     };
 
     static const char* kDstTextureColorName;
 
     bool fSetupFragPosition;
     bool fTopLeftFragPosRead;
     int  fCustomColorOutputIndex;
 
     // some state to verify shaders and effects are consistent, this is reset between effects by
     // the program creator
     bool fHasReadDstColor;
     bool fHasReadFragmentPosition;
 
     friend class GrGLProgramBuilder;
 
     typedef GrGLSLXPFragmentBuilder INHERITED;
 };
 
 #endif