Added varying struct

src/gpu/effects/GrDistanceFieldTextureEffect.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDistanceFieldTextureEffect.h"
 #include "gl/builders/GrGLProgramBuilder.h"
 #include "gl/GrGLProcessor.h"
@@ skipping 31 matching lines @@
 
     virtual void emitCode(const EmitArgs& args) SK_OVERRIDE {
         const GrDistanceFieldTextureEffect& dfTexEffect =
                 args.fGP.cast<GrDistanceFieldTextureEffect>();
         SkASSERT(1 == dfTexEffect.getVertexAttribs().count());
 
         GrGLGPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
         SkAssertResult(fsBuilder->enableFeature(
                 GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 
-        SkString fsCoordName;
-        const char* vsCoordName;
-        const char* fsCoordNamePtr;
-        args.fPB->addVarying(kVec2f_GrSLType, "textureCoords", &vsCoordName, &fsCoordNamePtr);
-        fsCoordName = fsCoordNamePtr;
+        GrGLVertToFrag v("TextureCoords", kVec2f_GrSLType);
+        args.fPB->addVarying(&v);
 
         GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
-        vsBuilder->codeAppendf("\t%s = %s;\n", vsCoordName, dfTexEffect.inTextureCoords().c_str());
+        vsBuilder->codeAppendf("\t%s = %s;\n", v.vsOut(), dfTexEffect.inTextureCoords().c_str());
 
         const char* textureSizeUniName = NULL;
         fTextureSizeUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                                kVec2f_GrSLType, "TextureSize",
                                                &textureSizeUniName);
 
         fsBuilder->codeAppend("\tvec4 texColor = ");
         fsBuilder->appendTextureLookup(args.fSamplers[0],
-                                       fsCoordName.c_str(),
+                                       v.fsIn(),
                                        kVec2f_GrSLType);
         fsBuilder->codeAppend(";\n");
         fsBuilder->codeAppend("\tfloat distance = "
                           SK_DistanceFieldMultiplier "*(texColor.r - " SK_DistanceFieldThreshold ")"
                           "+ " SK_DistanceFieldNonLCDFactor ";\n");
 
         // we adjust for the effect of the transformation on the distance by using
         // the length of the gradient of the texture coordinates. We use st coordinates
         // to ensure we're mapping 1:1 from texel space to pixel space.
-        fsBuilder->codeAppendf("\tvec2 uv = %s;\n", fsCoordName.c_str());
+        fsBuilder->codeAppendf("\tvec2 uv = %s;\n", v.fsIn());
         fsBuilder->codeAppendf("\tvec2 st = uv*%s;\n", textureSizeUniName);
         fsBuilder->codeAppend("\tfloat afwidth;\n");
         if (dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag) {
             // this gives us a smooth step across approximately one fragment
             fsBuilder->codeAppend("\tafwidth = abs(" SK_DistanceFieldAAFactor "*dFdx(st.x));\n");
         } else {
             fsBuilder->codeAppend("\tvec2 Jdx = dFdx(st);\n");
             fsBuilder->codeAppend("\tvec2 Jdy = dFdy(st);\n");
 
             fsBuilder->codeAppend("\tvec2 uv_grad;\n");
@@ skipping 168 matching lines @@
 
     virtual void emitCode(const EmitArgs& args) SK_OVERRIDE {
         const GrDistanceFieldNoGammaTextureEffect& dfTexEffect =
                 args.fGP.cast<GrDistanceFieldNoGammaTextureEffect>();
         SkASSERT(1 == dfTexEffect.getVertexAttribs().count());
 
         GrGLGPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
         SkAssertResult(fsBuilder->enableFeature(
                                      GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 
-        SkString fsCoordName;
-        const char* vsCoordName;
-        const char* fsCoordNamePtr;
-        args.fPB->addVarying(kVec2f_GrSLType, "textureCoords", &vsCoordName, &fsCoordNamePtr);
-        fsCoordName = fsCoordNamePtr;
+        GrGLVertToFrag v("TextureCoords", kVec2f_GrSLType);
+        args.fPB->addVarying(&v);
 
         GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
-        vsBuilder->codeAppendf("%s = %s;", vsCoordName, dfTexEffect.inTextureCoords().c_str());
+        vsBuilder->codeAppendf("%s = %s;", v.vsOut(), dfTexEffect.inTextureCoords().c_str());
 
         const char* textureSizeUniName = NULL;
         fTextureSizeUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                               kVec2f_GrSLType, "TextureSize",
                                               &textureSizeUniName);
 
         fsBuilder->codeAppend("vec4 texColor = ");
         fsBuilder->appendTextureLookup(args.fSamplers[0],
-                                       fsCoordName.c_str(),
+                                       v.fsIn(),
                                        kVec2f_GrSLType);
         fsBuilder->codeAppend(";");
         fsBuilder->codeAppend("float distance = "
             SK_DistanceFieldMultiplier "*(texColor.r - " SK_DistanceFieldThreshold ");");
 
         // we adjust for the effect of the transformation on the distance by using
         // the length of the gradient of the texture coordinates. We use st coordinates
         // to ensure we're mapping 1:1 from texel space to pixel space.
-        fsBuilder->codeAppendf("vec2 uv = %s;", fsCoordName.c_str());
+        fsBuilder->codeAppendf("vec2 uv = %s;", v.fsIn());
         fsBuilder->codeAppendf("vec2 st = uv*%s;", textureSizeUniName);
         fsBuilder->codeAppend("float afwidth;");
         if (dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag) {
             // this gives us a smooth step across approximately one fragment
             fsBuilder->codeAppend("afwidth = abs(" SK_DistanceFieldAAFactor "*dFdx(st.x));");
         } else {
             fsBuilder->codeAppend("vec2 Jdx = dFdx(st);");
             fsBuilder->codeAppend("vec2 Jdy = dFdy(st);");
 
             fsBuilder->codeAppend("vec2 uv_grad;");
@@ skipping 111 matching lines @@
                                       const GrProcessor&)
     : INHERITED (factory)
     , fTextureSize(SkISize::Make(-1,-1))
     , fTextColor(GrColor_ILLEGAL) {}
 
     virtual void emitCode(const EmitArgs& args) SK_OVERRIDE {
         const GrDistanceFieldLCDTextureEffect& dfTexEffect =
                 args.fGP.cast<GrDistanceFieldLCDTextureEffect>();
         SkASSERT(1 == dfTexEffect.getVertexAttribs().count());
 
-        SkString fsCoordName;
-        const char* vsCoordName;
-        const char* fsCoordNamePtr;
-        args.fPB->addVarying(kVec2f_GrSLType, "textureCoords", &vsCoordName, &fsCoordNamePtr);
-        fsCoordName = fsCoordNamePtr;
+        GrGLVertToFrag v("TextureCoords", kVec2f_GrSLType);
+        args.fPB->addVarying(&v);
 
         GrGLVertexBuilder* vsBuilder = args.fPB->getVertexShaderBuilder();
-        vsBuilder->codeAppendf("\t%s = %s;\n", vsCoordName, dfTexEffect.inTextureCoords().c_str());
+        vsBuilder->codeAppendf("\t%s = %s;\n", v.vsOut(), dfTexEffect.inTextureCoords().c_str());
 
         const char* textureSizeUniName = NULL;
         // width, height, 1/(3*width)
         fTextureSizeUni = args.fPB->addUniform(GrGLProgramBuilder::kFragment_Visibility,
                                               kVec3f_GrSLType, "TextureSize",
                                               &textureSizeUniName);
 
         GrGLGPFragmentBuilder* fsBuilder = args.fPB->getFragmentShaderBuilder();
 
         SkAssertResult(fsBuilder->enableFeature(
                 GrGLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 
         // create LCD offset adjusted by inverse of transform
-        fsBuilder->codeAppendf("\tvec2 uv = %s;\n", fsCoordName.c_str());
+        fsBuilder->codeAppendf("\tvec2 uv = %s;\n", v.fsIn());
         fsBuilder->codeAppendf("\tvec2 st = uv*%s.xy;\n", textureSizeUniName);
         bool isUniformScale = !!(dfTexEffect.getFlags() & kUniformScale_DistanceFieldEffectMask);
         if (isUniformScale) {
             fsBuilder->codeAppend("\tfloat dx = dFdx(st.x);\n");
             fsBuilder->codeAppendf("\tvec2 offset = vec2(dx*%s.z, 0.0);\n", textureSizeUniName);
         } else {
             fsBuilder->codeAppend("\tvec2 Jdx = dFdx(st);\n");
             fsBuilder->codeAppend("\tvec2 Jdy = dFdy(st);\n");
             fsBuilder->codeAppendf("\tvec2 offset = %s.z*Jdx;\n", textureSizeUniName);
         }
@@ skipping 197 matching lines @@
                                         random->nextULessThan(256),
                                         random->nextULessThan(256));
     uint32_t flags = kUseLCD_DistanceFieldEffectFlag;
     flags |= random->nextBool() ? kUniformScale_DistanceFieldEffectMask : 0;
     flags |= random->nextBool() ? kBGR_DistanceFieldEffectFlag : 0;
     return GrDistanceFieldLCDTextureEffect::Create(textures[texIdx], params,
                                                    textures[texIdx2], params2,
                                                    textColor,
                                                    flags);
 }