Implement NVPR on GLES

src/gpu/gl/GrGLShaderBuilder.cpp

Index: src/gpu/gl/GrGLShaderBuilder.cpp
diff --git a/src/gpu/gl/GrGLShaderBuilder.cpp b/src/gpu/gl/GrGLShaderBuilder.cpp
index fe9a66ae42ff328871c5de08ad38ca92c3e0bb4b..5b8e690612e16b71674fdc0260e34c1a2fc22448 100644
--- a/src/gpu/gl/GrGLShaderBuilder.cpp
+++ b/src/gpu/gl/GrGLShaderBuilder.cpp
@@ -232,10 +232,11 @@ GrGLShaderBuilder::GrGLShaderBuilder(GrGpuGL* gpu,
     : fHasVertexShader(false)
     , fTexCoordSetCnt(0)
     , fProgramID(0)
+    , fFSInputs(kVarsPerBlock)
+    , fSeparableVaryingInfos(kVarsPerBlock)
     , fDesc(desc)
     , fGpu(gpu)
     , fFSFeaturesAddedMask(0)
-    , fFSInputs(kVarsPerBlock)
     , fFSOutputs(kMaxFSOutputs)
     , fUniforms(kVarsPerBlock)
     , fSetupFragPosition(false)
@@ -775,6 +776,16 @@ void GrGLShaderBuilder::resolveProgramLocations(GrGLuint programId) {
             fUniforms[i].fLocation = location;
         }
     }
+
+    int count = fSeparableVaryingInfos.count();
+    for (int i = 0; i < count; ++i) {
+        GrGLint location;
+        GL_CALL_RET(location,
+                    GetProgramResourceLocation(programId,
+                                               GR_GL_FRAGMENT_INPUT,
+                                               fSeparableVaryingInfos[i].fVariable.c_str()));
+        fSeparableVaryingInfos[i].fLocation = location;
+    }
 }
 
 const GrGLContextInfo& GrGLShaderBuilder::ctxInfo() const {
@@ -914,12 +925,23 @@ void GrGLFullShaderBuilder::addVarying(GrSLType type,
     {
         fsName = fVSOutputs.back().accessName();
     }
-    this->fsInputAppend().set(type, GrGLShaderVar::kVaryingIn_TypeModifier, *fsName);
+    this->fFSInputs.push_back().set(type, GrGLShaderVar::kVaryingIn_TypeModifier, *fsName);
     if (fsInName) {
         *fsInName = fsName->c_str();
     }
 }
 
+GrGLFullShaderBuilder::VaryingHandle
+GrGLFullShaderBuilder::addSeparableVarying(GrSLType type,
+                                        const char* name,
+                                        const char** vsOutName,
+                                        const char** fsInName) {
+    addVarying(type, name, vsOutName, fsInName);
+    SeparableVaryingInfo& varying = fSeparableVaryingInfos.push_back();
+    varying.fVariable = fFSInputs.back();
+    return VaryingHandle::CreateFromSeparableVaryingIndex(fSeparableVaryingInfos.count() - 1);
+}
+
 const SkString* GrGLFullShaderBuilder::getEffectAttributeName(int attributeIndex) const {
     const AttributePair* attribEnd = fEffectAttributes.end();
     for (const AttributePair* attrib = fEffectAttributes.begin(); attrib != attribEnd; ++attrib) {