Potentially optimize some GrGLEffects for known input color values

src/gpu/gl/GrGLProgramEffects.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 GrGLProgramEffects_DEFINED
 #define GrGLProgramEffects_DEFINED
 
@@ skipping 117 matching lines @@
  * This is an abstract base class for constructing different types of GrGLProgramEffects objects.
  */
 class GrGLProgramEffectsBuilder {
 public:
     /**
      * Emits the effect's shader code, and stores the necessary uniforms internally.
      */
     virtual void emitEffect(const GrEffectStage&,
                             GrGLProgramEffects::EffectKey,
                             const char* outColor,
-                            const char* inColor,
+                            const GrGLSLExpr4& inColor,
                             int stageIndex) = 0;
 };
 
 ////////////////////////////////////////////////////////////////////////////////
 
 /**
  * This is a GrGLProgramEffects implementation that does coord transforms with the vertex shader.
  */
 class GrGLVertexProgramEffects : public GrGLProgramEffects {
 public:
@@ skipping 11 matching lines @@
     }
 
     /**
      * Helper for GrGLProgramEffectsBuilder::emitEfffect(). This method is meant to only be called
      * during the construction phase.
      */
     void emitEffect(GrGLFullShaderBuilder*,
                     const GrEffectStage&,
                     GrGLProgramEffects::EffectKey,
                     const char* outColor,
-                    const char* inColor,
+                    const GrGLSLExpr4& inColor,
                     int stageIndex);
 
     /**
      * Helper for emitEffect(). Emits any attributes an effect may have.
      */
     void emitAttributes(GrGLFullShaderBuilder*, const GrEffectStage&);
 
     /**
      * Helper for emitEffect(). Emits code to implement an effect's coord transforms in the VS.
      * Varyings are added as an outputs of the VS and inputs to the FS. The varyings may be either a
@@ skipping 27 matching lines @@
 /**
  * This class is used to construct a GrGLVertexProgramEffects* object.
  */
 class GrGLVertexProgramEffectsBuilder : public GrGLProgramEffectsBuilder {
 public:
     GrGLVertexProgramEffectsBuilder(GrGLFullShaderBuilder*, int reserveCount);
 
     virtual void emitEffect(const GrEffectStage&,
                             GrGLProgramEffects::EffectKey,
                             const char* outColor,
-                            const char* inColor,
+                            const GrGLSLExpr4& inColor,
                             int stageIndex) SK_OVERRIDE;
 
     /**
      * Finalizes the building process and returns the effect array. After this call, the builder
      * becomes invalid.
      */
     GrGLProgramEffects* finish() { return fProgramEffects.detach(); }
 
 private:
     GrGLFullShaderBuilder*                  fBuilder;
@@ skipping 23 matching lines @@
     }
 
     /**
      * Helper for GrGLProgramEffectsBuilder::emitEfffect(). This method is meant to only be called
      * during the construction phase.
      */
     void emitEffect(GrGLFragmentOnlyShaderBuilder*,
                     const GrEffectStage&,
                     GrGLProgramEffects::EffectKey,
                     const char* outColor,
-                    const char* inColor,
+                    const GrGLSLExpr4& inColor,
                     int stageIndex);
 
     /**
      * Helper for emitEffect(). Allocates texture units from the builder for each transform in an
      * effect. The transforms all use adjacent texture units. They either use two or three of the
      * coordinates at a given texture unit, depending on if they need perspective interpolation.
      * The expressions to access the transformed coords (i.e. 'vec2(gl_TexCoord[0])') as well as the
      * types are appended to the TransformedCoordsArray* object, which is in turn passed to the
      * effect's emitCode() function.
      */
@@ skipping 22 matching lines @@
 /**
  * This class is used to construct a GrGLTexGenProgramEffects* object.
  */
 class GrGLTexGenProgramEffectsBuilder : public GrGLProgramEffectsBuilder {
 public:
     GrGLTexGenProgramEffectsBuilder(GrGLFragmentOnlyShaderBuilder*, int reserveCount);
 
     virtual void emitEffect(const GrEffectStage&,
                             GrGLProgramEffects::EffectKey,
                             const char* outColor,
-                            const char* inColor,
+                            const GrGLSLExpr4& inColor,
                             int stageIndex) SK_OVERRIDE;
 
     /**
      * Finalizes the building process and returns the effect array. After this call, the builder
      * becomes invalid.
      */
     GrGLProgramEffects* finish() { return fProgramEffects.detach(); }
 
 private:
     GrGLFragmentOnlyShaderBuilder*          fBuilder;
     SkAutoTDelete<GrGLTexGenProgramEffects> fProgramEffects;
 
     typedef GrGLProgramEffectsBuilder INHERITED;
 };
 
 #endif