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

src/gpu/effects/GrCustomXfermode.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "effects/GrCustomXfermode.h"
 #include "effects/GrCustomXfermodePriv.h"
 
@@ skipping 429 matching lines @@
     }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 class GLCustomXferFP : public GrGLFragmentProcessor {
 public:
     GLCustomXferFP(const GrFragmentProcessor&) {}
     ~GLCustomXferFP() override {};
 
-    void emitCode(GrGLFPBuilder* builder,
-                  const GrFragmentProcessor& fp,
-                  const char* outputColor,
-                  const char* inputColor,
-                  const TransformedCoordsArray& coords,
-                  const TextureSamplerArray& samplers) override {
-        SkXfermode::Mode mode = fp.cast<GrCustomXferFP>().mode();
-        GrGLFragmentBuilder* fsBuilder = builder->getFragmentShaderBuilder();
+    void emitCode(EmitArgs& args) override {
+        SkXfermode::Mode mode = args.fFp.cast<GrCustomXferFP>().mode();
+        GrGLFragmentBuilder* fsBuilder = args.fBuilder->getFragmentShaderBuilder();
         const char* dstColor = "bgColor";
         fsBuilder->codeAppendf("vec4 %s = ", dstColor);
-        fsBuilder->appendTextureLookup(samplers[0], coords[0].c_str(), coords[0].getType());
+        fsBuilder->appendTextureLookup(args.fSamplers[0], args.fCoords[0].c_str(),
+                                       args.fCoords[0].getType());
         fsBuilder->codeAppendf(";");
 
-        emit_custom_xfermode_code(mode, fsBuilder, outputColor, inputColor, dstColor); 
+        emit_custom_xfermode_code(mode, fsBuilder, args.fOutputColor, args.fInputColor, dstColor);
     }
 
     void setData(const GrGLProgramDataManager&, const GrProcessor&) override {}
 
     static void GenKey(const GrFragmentProcessor& proc, const GrGLSLCaps&, GrProcessorKeyBuilder* b) {
         // The background may come from the dst or from a texture.
         uint32_t key = proc.numTextures();
         SkASSERT(key <= 1);
         key |= proc.cast<GrCustomXferFP>().mode() << 1;
         b->add32(key);
@@ skipping 339 matching lines @@
 }
 
 GR_DEFINE_XP_FACTORY_TEST(GrCustomXPFactory);
 GrXPFactory* GrCustomXPFactory::TestCreate(GrProcessorTestData* d) {
     int mode = d->fRandom->nextRangeU(SkXfermode::kLastCoeffMode + 1,
                                       SkXfermode::kLastSeparableMode);
 
     return SkNEW_ARGS(GrCustomXPFactory, (static_cast<SkXfermode::Mode>(mode)));
 }