Create GrGLSLVaryingHandler class for program building

src/gpu/effects/GrDistanceFieldGeoProc.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 "GrDistanceFieldGeoProc.h"
 #include "GrInvariantOutput.h"
 #include "GrTexture.h"
 
 #include "SkDistanceFieldGen.h"
 
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 #include "glsl/GrGLSLGeometryProcessor.h"
 #include "glsl/GrGLSLProgramBuilder.h"
 #include "glsl/GrGLSLProgramDataManager.h"
+#include "glsl/GrGLSLUtil.h"
+#include "glsl/GrGLSLVarying.h"
 #include "glsl/GrGLSLVertexShaderBuilder.h"
-#include "glsl/GrGLSLUtil.h"
 
 // Assuming a radius of a little less than the diagonal of the fragment
 #define SK_DistanceFieldAAFactor     "0.65"
 
 class GrGLDistanceFieldA8TextGeoProc : public GrGLSLGeometryProcessor {
 public:
     GrGLDistanceFieldA8TextGeoProc()
         : fViewMatrix(SkMatrix::InvalidMatrix())
         , fColor(GrColor_ILLEGAL)
 #ifdef SK_GAMMA_APPLY_TO_A8
         , fDistanceAdjust(-1.0f)
 #endif
         {}
 
     void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{
         const GrDistanceFieldA8TextGeoProc& dfTexEffect =
                 args.fGP.cast<GrDistanceFieldA8TextGeoProc>();
         GrGLSLGPBuilder* pb = args.fPB;
         GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
         SkAssertResult(fragBuilder->enableFeature(
                 GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 
         GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
+        GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
 
         // emit attributes
-        vertBuilder->emitAttributes(dfTexEffect);
+        varyingHandler->emitAttributes(dfTexEffect);
 
 #ifdef SK_GAMMA_APPLY_TO_A8
         // adjust based on gamma
         const char* distanceAdjustUniName = nullptr;
         // width, height, 1/(3*width)
         fDistanceAdjustUni = pb->addUniform(GrGLSLProgramBuilder::kFragment_Visibility,
             kFloat_GrSLType, kDefault_GrSLPrecision,
             "DistanceAdjust", &distanceAdjustUniName);
 #endif
 
         // Setup pass through color
         if (!dfTexEffect.colorIgnored()) {
             if (dfTexEffect.hasVertexColor()) {
-                pb->addPassThroughAttribute(dfTexEffect.inColor(), args.fOutputColor);
+                varyingHandler->addPassThroughAttribute(dfTexEffect.inColor(), args.fOutputColor);
             } else {
                 this->setupUniformColor(pb, fragBuilder, args.fOutputColor, &fColorUniform);
             }
         }
 
         // Setup position
         this->setupPosition(pb,
                             vertBuilder,
                             gpArgs,
                             dfTexEffect.inPosition()->fName,
                             dfTexEffect.viewMatrix(),
                             &fViewMatrixUniform);
 
         // emit transforms
         this->emitTransforms(pb,
                              vertBuilder,
+                             varyingHandler,
                              gpArgs->fPositionVar,
                              dfTexEffect.inPosition()->fName,
                              args.fTransformsIn,
                              args.fTransformsOut);
 
         // add varyings
         GrGLSLVertToFrag recipScale(kFloat_GrSLType);
         GrGLSLVertToFrag st(kVec2f_GrSLType);
         bool isSimilarity = SkToBool(dfTexEffect.getFlags() & kSimilarity_DistanceFieldEffectFlag);
-        pb->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision);
+        varyingHandler->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision);
         vertBuilder->codeAppendf("%s = %s;", st.vsOut(), dfTexEffect.inTextureCoords()->fName);
 
         // compute numbers to be hardcoded to convert texture coordinates from int to float
         SkASSERT(dfTexEffect.numTextures() == 1);
         GrTexture* atlas = dfTexEffect.textureAccess(0).getTexture();
         SkASSERT(atlas && SkIsPow2(atlas->width()) && SkIsPow2(atlas->height()));
         SkScalar recipWidth = 1.0f / atlas->width();
         SkScalar recipHeight = 1.0f / atlas->height();
 
         GrGLSLVertToFrag uv(kVec2f_GrSLType);
-        pb->addVarying("TextureCoords", &uv, kHigh_GrSLPrecision);
+        varyingHandler->addVarying("TextureCoords", &uv, kHigh_GrSLPrecision);
         vertBuilder->codeAppendf("%s = vec2(%.*f, %.*f) * %s;", uv.vsOut(),
                                  GR_SIGNIFICANT_POW2_DECIMAL_DIG, recipWidth,
                                  GR_SIGNIFICANT_POW2_DECIMAL_DIG, recipHeight,
                                  dfTexEffect.inTextureCoords()->fName);
         
         // Use highp to work around aliasing issues
         fragBuilder->codeAppend(GrGLSLShaderVar::PrecisionString(args.fGLSLCaps,
                                                                  kHigh_GrSLPrecision));
         fragBuilder->codeAppendf("vec2 uv = %s;\n", uv.fsIn());
 
@@ skipping 185 matching lines @@
 
     void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{
         const GrDistanceFieldPathGeoProc& dfTexEffect = args.fGP.cast<GrDistanceFieldPathGeoProc>();
 
         GrGLSLGPBuilder* pb = args.fPB;
         GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
         SkAssertResult(fragBuilder->enableFeature(
                                      GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 
         GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
+        GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
 
         // emit attributes
-        vertBuilder->emitAttributes(dfTexEffect);
+        varyingHandler->emitAttributes(dfTexEffect);
 
         GrGLSLVertToFrag v(kVec2f_GrSLType);
-        pb->addVarying("TextureCoords", &v, kHigh_GrSLPrecision);
+        varyingHandler->addVarying("TextureCoords", &v, kHigh_GrSLPrecision);
 
         // setup pass through color
         if (!dfTexEffect.colorIgnored()) {
             if (dfTexEffect.hasVertexColor()) {
-                pb->addPassThroughAttribute(dfTexEffect.inColor(), args.fOutputColor);
+                varyingHandler->addPassThroughAttribute(dfTexEffect.inColor(), args.fOutputColor);
             } else {
                 this->setupUniformColor(pb, fragBuilder, args.fOutputColor, &fColorUniform);
             }
         }
         vertBuilder->codeAppendf("%s = %s;", v.vsOut(), dfTexEffect.inTextureCoords()->fName);
 
         // Setup position
         this->setupPosition(pb,
                             vertBuilder,
                             gpArgs,
                             dfTexEffect.inPosition()->fName,
                             dfTexEffect.viewMatrix(),
                             &fViewMatrixUniform);
 
         // emit transforms
         this->emitTransforms(pb,
                              vertBuilder,
+                             varyingHandler,
                              gpArgs->fPositionVar,
                              dfTexEffect.inPosition()->fName,
                              args.fTransformsIn,
                              args.fTransformsOut);
 
         const char* textureSizeUniName = nullptr;
         fTextureSizeUni = pb->addUniform(GrGLSLProgramBuilder::kFragment_Visibility,
                                          kVec2f_GrSLType, kDefault_GrSLPrecision,
                                          "TextureSize", &textureSizeUniName);
 
@@ skipping 172 matching lines @@
         : fViewMatrix(SkMatrix::InvalidMatrix()), fColor(GrColor_ILLEGAL) {
         fDistanceAdjust = GrDistanceFieldLCDTextGeoProc::DistanceAdjust::Make(1.0f, 1.0f, 1.0f);
     }
 
     void onEmitCode(EmitArgs& args, GrGPArgs* gpArgs) override{
         const GrDistanceFieldLCDTextGeoProc& dfTexEffect =
                 args.fGP.cast<GrDistanceFieldLCDTextGeoProc>();
         GrGLSLGPBuilder* pb = args.fPB;
 
         GrGLSLVertexBuilder* vertBuilder = args.fVertBuilder;
+        GrGLSLVaryingHandler* varyingHandler = args.fVaryingHandler;
 
         // emit attributes
-        vertBuilder->emitAttributes(dfTexEffect);
+        varyingHandler->emitAttributes(dfTexEffect);
 
         GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
 
         // setup pass through color
         if (!dfTexEffect.colorIgnored()) {
             this->setupUniformColor(pb, fragBuilder, args.fOutputColor, &fColorUniform);
         }
 
         // Setup position
         this->setupPosition(pb,
                             vertBuilder,
                             gpArgs,
                             dfTexEffect.inPosition()->fName,
                             dfTexEffect.viewMatrix(),
                             &fViewMatrixUniform);
 
         // emit transforms
         this->emitTransforms(pb,
                              vertBuilder,
+                             varyingHandler,
                              gpArgs->fPositionVar,
                              dfTexEffect.inPosition()->fName,
                              args.fTransformsIn,
                              args.fTransformsOut);
 
         // set up varyings
         bool isUniformScale = SkToBool(dfTexEffect.getFlags() & kUniformScale_DistanceFieldEffectMask);
         GrGLSLVertToFrag recipScale(kFloat_GrSLType);
         GrGLSLVertToFrag st(kVec2f_GrSLType);
-        pb->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision);
+        varyingHandler->addVarying("IntTextureCoords", &st, kHigh_GrSLPrecision);
         vertBuilder->codeAppendf("%s = %s;", st.vsOut(), dfTexEffect.inTextureCoords()->fName);
 
         // compute numbers to be hardcoded to convert texture coordinates from int to float
         SkASSERT(dfTexEffect.numTextures() == 1);
         GrTexture* atlas = dfTexEffect.textureAccess(0).getTexture();
         SkASSERT(atlas && SkIsPow2(atlas->width()) && SkIsPow2(atlas->height()));
         SkScalar recipWidth = 1.0f / atlas->width();
         SkScalar recipHeight = 1.0f / atlas->height();
 
         GrGLSLVertToFrag uv(kVec2f_GrSLType);
-        pb->addVarying("TextureCoords", &uv, kHigh_GrSLPrecision);
+        varyingHandler->addVarying("TextureCoords", &uv, kHigh_GrSLPrecision);
         vertBuilder->codeAppendf("%s = vec2(%.*f, %.*f) * %s;", uv.vsOut(),
                                  GR_SIGNIFICANT_POW2_DECIMAL_DIG, recipWidth,
                                  GR_SIGNIFICANT_POW2_DECIMAL_DIG, recipHeight,
                                  dfTexEffect.inTextureCoords()->fName);
 
         // add frag shader code
 
         SkAssertResult(fragBuilder->enableFeature(
                 GrGLSLFragmentShaderBuilder::kStandardDerivatives_GLSLFeature));
 
@@ skipping 202 matching lines @@
     uint32_t flags = kUseLCD_DistanceFieldEffectFlag;
     flags |= d->fRandom->nextBool() ? kUniformScale_DistanceFieldEffectMask : 0;
     flags |= d->fRandom->nextBool() ? kBGR_DistanceFieldEffectFlag : 0;
     return GrDistanceFieldLCDTextGeoProc::Create(GrRandomColor(d->fRandom),
                                                  GrTest::TestMatrix(d->fRandom),
                                                  d->fTextures[texIdx], params,
                                                  wa,
                                                  flags,
                                                  d->fRandom->nextBool());
 }