Key shader on whether frag pos read is relative to top-left or bottom-left

src/gpu/gl/GrGLProgramDesc.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLProgramDesc_DEFINED
 #define GrGLProgramDesc_DEFINED
 
@@ skipping 89 matching lines @@
     GrGLEffect::EffectKey       fEffectKeys[GrDrawState::kNumStages];
 
     // To enable experimental geometry shader code (not for use in
     // production)
 #if GR_GL_EXPERIMENTAL_GS
     bool                     fExperimentalGS;
 #endif
 
     GrGLShaderBuilder::DstReadKey fDstRead;             // set by GrGLShaderBuilder if there
                                                         // are effects that must read the dst.
                                                         // Otherwise, 0.

[robertphillips, 2013/05/10 13:53:58]

fFragPosKey?

[bsalomon, 2013/05/13 15:16:49]

Done, and changed fDstRead->fDstReadKey

+    GrGLShaderBuilder::FragPosKey fFragPos;             // set by GrGLShaderBuilder if there are
+                                                        // effects that read the fragment position.
+                                                        // Otherwise, 0.
 
     // should the FS discard if the coverage is zero (to avoid stencil manipulation)
     SkBool8                     fDiscardIfZeroCoverage;
 
     uint8_t                     fColorInput;            // casts to enum ColorInput
     uint8_t                     fCoverageInput;         // casts to enum ColorInput
     uint8_t                     fCoverageOutput;        // casts to enum CoverageOutput
 
     int8_t                      fFirstCoverageStage;
     SkBool8                     fEmitsPointSize;
     uint8_t                     fColorFilterXfermode;   // casts to enum SkXfermode::Mode
 
     int8_t                      fPositionAttributeIndex;
     int8_t                      fLocalCoordAttributeIndex;
     int8_t                      fColorAttributeIndex;
     int8_t                      fCoverageAttributeIndex;
 
     // GrGLProgram and GrGLShaderBuilder read the private fields to generate code. TODO: Move all
     // code generation to GrGLShaderBuilder (and maybe add getters rather than friending).
     friend class GrGLProgram;
     friend class GrGLShaderBuilder;
 };
 
 #endif