Added GrGLFragmentProcessor::EmitArgs struct for use with emitCode()

src/effects/SkAlphaThresholdFilter.cpp

Index: src/effects/SkAlphaThresholdFilter.cpp
diff --git a/src/effects/SkAlphaThresholdFilter.cpp b/src/effects/SkAlphaThresholdFilter.cpp
index 55e113efe17cee20b7c98f245521c19816908290..c9d72bb67305dff45d7d3591bf667333bd1a5865 100644
--- a/src/effects/SkAlphaThresholdFilter.cpp
+++ b/src/effects/SkAlphaThresholdFilter.cpp
@@ -128,12 +128,7 @@ class GrGLAlphaThresholdEffect : public GrGLFragmentProcessor {
 public:
     GrGLAlphaThresholdEffect(const GrFragmentProcessor&) {}
 
-    virtual void emitCode(GrGLFPBuilder*,
-                          const GrFragmentProcessor&,
-                          const char* outputColor,
-                          const char* inputColor,
-                          const TransformedCoordsArray&,
-                          const TextureSamplerArray&) override;
+    virtual void emitCode(EmitArgs&) override;
 
     void setData(const GrGLProgramDataManager&, const GrProcessor&) override;
 
@@ -145,38 +140,33 @@ private:
     typedef GrGLFragmentProcessor INHERITED;
 };
 
-void GrGLAlphaThresholdEffect::emitCode(GrGLFPBuilder* builder,
-                                        const GrFragmentProcessor&,
-                                        const char* outputColor,
-                                        const char* inputColor,
-                                        const TransformedCoordsArray& coords,
-                                        const TextureSamplerArray& samplers) {
-    fInnerThresholdVar = builder->addUniform(
+void GrGLAlphaThresholdEffect::emitCode(EmitArgs& args) {
+    fInnerThresholdVar = args.fBuilder->addUniform(
         GrGLProgramBuilder::kFragment_Visibility,
         kFloat_GrSLType, kDefault_GrSLPrecision,
         "inner_threshold");
-    fOuterThresholdVar = builder->addUniform(
+    fOuterThresholdVar = args.fBuilder->addUniform(
         GrGLProgramBuilder::kFragment_Visibility,
         kFloat_GrSLType, kDefault_GrSLPrecision,
         "outer_threshold");
 
-    GrGLFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
-    SkString coords2D = fsBuilder->ensureFSCoords2D(coords, 0);
-    SkString maskCoords2D = fsBuilder->ensureFSCoords2D(coords, 1);
+    GrGLFragmentBuilder* fsBuilder = args.fBuilder->getFragmentShaderBuilder();
+    SkString coords2D = fsBuilder->ensureFSCoords2D(args.fCoords, 0);
+    SkString maskCoords2D = fsBuilder->ensureFSCoords2D(args.fCoords, 1);
 
     fsBuilder->codeAppendf("\t\tvec2 coord = %s;\n", coords2D.c_str());
     fsBuilder->codeAppendf("\t\tvec2 mask_coord = %s;\n", maskCoords2D.c_str());
     fsBuilder->codeAppend("\t\tvec4 input_color = ");
-    fsBuilder->appendTextureLookup(samplers[0], "coord");
+    fsBuilder->appendTextureLookup(args.fSamplers[0], "coord");
     fsBuilder->codeAppend(";\n");
     fsBuilder->codeAppend("\t\tvec4 mask_color = ");
-    fsBuilder->appendTextureLookup(samplers[1], "mask_coord");
+    fsBuilder->appendTextureLookup(args.fSamplers[1], "mask_coord");
     fsBuilder->codeAppend(";\n");
 
     fsBuilder->codeAppendf("\t\tfloat inner_thresh = %s;\n",
-                           builder->getUniformCStr(fInnerThresholdVar));
+                           args.fBuilder->getUniformCStr(fInnerThresholdVar));
     fsBuilder->codeAppendf("\t\tfloat outer_thresh = %s;\n",
-                           builder->getUniformCStr(fOuterThresholdVar));
+                           args.fBuilder->getUniformCStr(fOuterThresholdVar));
     fsBuilder->codeAppend("\t\tfloat mask = mask_color.a;\n");
 
     fsBuilder->codeAppend("vec4 color = input_color;\n");
@@ -192,8 +182,8 @@ void GrGLAlphaThresholdEffect::emitCode(GrGLFPBuilder* builder,
                           "\t\t\tcolor.a = inner_thresh;\n"
                           "\t\t}\n");
 
-    fsBuilder->codeAppendf("%s = %s;\n", outputColor,
-                           (GrGLSLExpr4(inputColor) * GrGLSLExpr4("color")).c_str());
+    fsBuilder->codeAppendf("%s = %s;\n", args.fOutputColor,
+                           (GrGLSLExpr4(args.fInputColor) * GrGLSLExpr4("color")).c_str());
 }
 
 void GrGLAlphaThresholdEffect::setData(const GrGLProgramDataManager& pdman,