added support for PLS path rendering

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 "gl/GrGLGpu.h"
 #include "glsl/GrGLSL.h"
 #include "glsl/GrGLSLCaps.h"
 #include "glsl/GrGLSLProgramBuilder.h"
 #include "glsl/GrGLSLUniformHandler.h"
 #include "glsl/GrGLSLVarying.h"
 
 const char* GrGLSLFragmentShaderBuilder::kDstTextureColorName = "_dstColor";
 
 static const char* specific_layout_qualifier_name(GrBlendEquation equation) {
     SkASSERT(GrBlendEquationIsAdvanced(equation));
@@ skipping 60 matching lines @@
         case kStandardDerivatives_GLSLFeature: {
             if (!fProgramBuilder->glslCaps()->shaderDerivativeSupport()) {
                 return false;
             }
             const char* extension = fProgramBuilder->glslCaps()->shaderDerivativeExtensionString();
             if (extension) {
                 this->addFeature(1 << kStandardDerivatives_GLSLFeature, extension);
             }
             return true;
         }
+        case kPixelLocalStorage_GLSLFeature: {
+            if (fProgramBuilder->glslCaps()->pixelLocalStorageSize() <= 0) {
+                return false;
+            }
+            this->addFeature(1 << kPixelLocalStorage_GLSLFeature,
+                             "GL_EXT_shader_pixel_local_storage");
+            return true;
+        }
         default:
             SkFAIL("Unexpected GLSLFeature requested.");
             return false;
     }
 }
 
 SkString GrGLSLFragmentShaderBuilder::ensureFSCoords2D(const GrGLSLTransformedCoordsArray& coords,
                                                        int index) {
     if (kVec3f_GrSLType != coords[index].getType()) {
         SkASSERT(kVec2f_GrSLType == coords[index].getType());
@@ skipping 53 matching lines @@
             fSetupFragPosition = true;
         }
         SkASSERT(fProgramBuilder->fUniformHandles.fRTHeightUni.isValid());
         return kCoordName;
     }
 }
 
 const char* GrGLSLFragmentShaderBuilder::dstColor() {
     fHasReadDstColor = true;
 
+    const char* override = fProgramBuilder->primitiveProcessor().getDestColorOverride();
+    if (override != nullptr) {
+        return override;
+    }
+
     const GrGLSLCaps* glslCaps = fProgramBuilder->glslCaps();
     if (glslCaps->fbFetchSupport()) {
         this->addFeature(1 << (GrGLSLFragmentShaderBuilder::kLastGLSLPrivateFeature + 1),
                          glslCaps->fbFetchExtensionString());
 
         // Some versions of this extension string require declaring custom color output on ES 3.0+
         const char* fbFetchColorName = glslCaps->fbFetchColorName();
         if (glslCaps->fbFetchNeedsCustomOutput()) {
             this->enableCustomOutput();
             fOutputs[fCustomColorOutputIndex].setTypeModifier(GrShaderVar::kInOut_TypeModifier);
@@ skipping 47 matching lines @@
     if (caps.mustDeclareFragmentShaderOutput()) {
         fOutputs.push_back().set(kVec4f_GrSLType, GrGLSLShaderVar::kOut_TypeModifier,
                                  DeclaredSecondaryColorOutputName());
     }
 }
 
 const char* GrGLSLFragmentShaderBuilder::getPrimaryColorOutputName() const {
     return fHasCustomColorOutput ? DeclaredColorOutputName() : "gl_FragColor";
 }
 
+void GrGLSLFragmentBuilder::declAppendf(const char* fmt, ...) {
+    va_list argp;
+    va_start(argp, fmt);
+    inputs().appendVAList(fmt, argp);
+    va_end(argp);    
+}
+
 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 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);
 }