Create GrGLSLVaryingHandler class for program building

src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLSLFragmentShaderBuilder.h"
 #include "GrRenderTarget.h"
 #include "glsl/GrGLSL.h"
 #include "glsl/GrGLSLCaps.h"
 #include "glsl/GrGLSLProgramBuilder.h"
+#include "glsl/GrGLSLVarying.h"
 
 const char* GrGLSLFragmentShaderBuilder::kDstTextureColorName = "_dstColor";
 
 static const char* specific_layout_qualifier_name(GrBlendEquation equation) {
     SkASSERT(GrBlendEquationIsAdvanced(equation));
 
     static const char* kLayoutQualifierNames[] = {
         "blend_support_screen",
         "blend_support_overlay",
         "blend_support_darken",
@@ skipping 207 matching lines @@
     return fHasCustomColorOutput ? DeclaredColorOutputName() : "gl_FragColor";
 }
 
 const char* GrGLSLFragmentShaderBuilder::getSecondaryColorOutputName() const {
     const GrGLSLCaps& caps = *fProgramBuilder->glslCaps();
     return caps.mustDeclareFragmentShaderOutput() ? DeclaredSecondaryColorOutputName()
                                                   : "gl_SecondaryFragColorEXT";
 }
 
 void GrGLSLFragmentShaderBuilder::onFinalize() {
+    fProgramBuilder->varyingHandler()->getFragDecls(&this->inputs(), &this->outputs());
     GrGLSLAppendDefaultFloatPrecisionDeclaration(kDefault_GrSLPrecision,
                                                  *fProgramBuilder->glslCaps(),
                                                  &this->precisionQualifier());
 }
 
-void GrGLSLFragmentShaderBuilder::addVarying(GrGLSLVarying* v, GrSLPrecision fsPrec) {
-    v->fFsIn = v->fVsOut;
-    if (v->fGsOut) {
-        v->fFsIn = v->fGsOut;
-    }
-    fInputs.push_back().set(v->fType, GrGLSLShaderVar::kVaryingIn_TypeModifier, v->fFsIn, fsPrec);
-}
-
 void GrGLSLFragmentBuilder::onBeforeChildProcEmitCode() {
     SkASSERT(fSubstageIndices.count() >= 1);
     fSubstageIndices.push_back(0);
     // second-to-last value in the fSubstageIndices stack is the index of the child proc
     // at that level which is currently emitting code.
     fMangleString.appendf("_c%d", fSubstageIndices[fSubstageIndices.count() - 2]);
 }
 
 void GrGLSLFragmentBuilder::onAfterChildProcEmitCode() {
     SkASSERT(fSubstageIndices.count() >= 2);
     fSubstageIndices.pop_back();
     fSubstageIndices.back()++;
     int removeAt = fMangleString.findLastOf('_');
     fMangleString.remove(removeAt, fMangleString.size() - removeAt);
 }