Added varying struct

src/gpu/gl/builders/GrGLVertexShaderBuilder.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 "GrGLVertexShaderBuilder.h"
 #include "GrGLProgramBuilder.h"
 #include "GrGLShaderStringBuilder.h"
 #include "../GrGpuGL.h"
 
 #define GL_CALL(X) GR_GL_CALL(fProgramBuilder->gpu()->glInterface(), X)
 #define GL_CALL_RET(R, X) GR_GL_CALL_RET(fProgramBuilder->gpu()->glInterface(), R, X)
 
 static const char* color_attribute_name() { return "inColor"; }
 static const char* coverage_attribute_name() { return "inCoverage"; }
 
 GrGLVertexBuilder::GrGLVertexBuilder(GrGLProgramBuilder* program)
     : INHERITED(program)
     , fPositionVar(NULL)
     , fLocalCoordsVar(NULL)
     , fEffectAttribOffset(0) {
 }
 
-SkString* GrGLVertexBuilder::addVarying(GrSLType type, const char* name,
-                                              const char** vsOutName) {
+void GrGLVertexBuilder::addVarying(const char* name, GrGLVarying* v) {
     fOutputs.push_back();
-    fOutputs.back().setType(type);
+    fOutputs.back().setType(v->fType);
     fOutputs.back().setTypeModifier(GrGLShaderVar::kVaryingOut_TypeModifier);
     fProgramBuilder->nameVariable(fOutputs.back().accessName(), 'v', name);
-
-    if (vsOutName) {
-        *vsOutName = fOutputs.back().getName().c_str();
-    }
-    return fOutputs.back().accessName();
+    v->fVsOut = fOutputs.back().getName().c_str();
 }
 
 void GrGLVertexBuilder::setupLocalCoords() {
     fPositionVar = &fInputs.push_back();
     fPositionVar->set(kVec2f_GrSLType, GrGLShaderVar::kAttribute_TypeModifier, "inPosition");
     if (-1 != fProgramBuilder->header().fLocalCoordAttributeIndex) {
         fLocalCoordsVar = &fInputs.push_back();
         fLocalCoordsVar->set(kVec2f_GrSLType,
                              GrGLShaderVar::kAttribute_TypeModifier,
                              "inLocalCoords");
     } else {
         fLocalCoordsVar = fPositionVar;
     }
     fEffectAttribOffset = fInputs.count();
 }
 
 void GrGLVertexBuilder::transformGLToSkiaCoords() {
     const char* viewMName;
     fProgramBuilder->fUniformHandles.fViewMatrixUni =
             fProgramBuilder->addUniform(GrGLProgramBuilder::kVertex_Visibility,
                                         kMat33f_GrSLType,
                                         "ViewM",
                                         &viewMName);
 
     // Transform the position into Skia's device coords.
     this->codeAppendf("vec3 pos3 = %s * vec3(%s, 1);", viewMName, fPositionVar->c_str());
 }
 
 void GrGLVertexBuilder::setupBuiltinVertexAttribute(const char* inName, GrGLSLExpr4* out) {
+    GrGLVertToFrag v(kVec4f_GrSLType);
+    fProgramBuilder->addVarying(inName, &v);
     SkString name(inName);
-    const char *vsName, *fsName;
-    fProgramBuilder->addVarying(kVec4f_GrSLType, name.c_str(), &vsName, &fsName);
     name.prepend("in");
     this->addAttribute(GrShaderVar(name.c_str(),
                                    kVec4f_GrSLType,
                                    GrShaderVar::kAttribute_TypeModifier));
-    this->codeAppendf("%s = %s;", vsName, name.c_str());
-    *out = fsName;
+    this->codeAppendf("%s = %s;", v.vsOut(), name.c_str());
+    *out = v.fsIn();
     fEffectAttribOffset++;
 }
 
 void GrGLVertexBuilder::emitAttributes(const GrGeometryProcessor& gp) {
     const GrGeometryProcessor::VertexAttribArray& vars = gp.getVertexAttribs();
     int numAttributes = vars.count();
     for (int a = 0; a < numAttributes; ++a) {
         this->addAttribute(vars[a]);
     }
 }
@@ skipping 84 matching lines @@
     for (int i = 0; i < fInputs.count(); ++i) {
         const GrGLShaderVar& attr = fInputs[i];
         // if attribute already added, don't add it again
         if (attr.getName().equals(var.getName())) {
             return false;
         }
     }
     fInputs.push_back(var);
     return true;
 }