Revert of Move copy-surface-as-draw fallback to GrGLGpu.

src/gpu/gl/builders/GrGLFragmentShaderBuilder.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 "GrGLFragmentShaderBuilder.h"
 #include "GrGLProgramBuilder.h"
 #include "../GrGLGpu.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)
 
 const char* GrGLFragmentShaderBuilder::kDstCopyColorName = "_dstColor";
 static const char* declared_color_output_name() { return "fsColorOut"; }
 static const char* dual_source_output_name() { return "dualSourceOut"; }
+static void append_default_precision_qualifier(GrSLPrecision p,
+                                               GrGLStandard standard,
+                                               SkString* str) {
+    // Desktop GLSL has added precision qualifiers but they don't do anything.
+    if (kGLES_GrGLStandard == standard) {
+        switch (p) {
+            case kHigh_GrSLPrecision:
+                str->append("precision highp float;\n");
+                break;
+            case kMedium_GrSLPrecision:
+                str->append("precision mediump float;\n");
+                break;
+            case kLow_GrSLPrecision:
+                str->append("precision lowp float;\n");
+                break;
+            default:
+                SkFAIL("Unknown precision value.");
+        }
+    }
+}
 
 static const char* specific_layout_qualifier_name(GrBlendEquation equation) {
     SkASSERT(GrBlendEquationIsAdvanced(equation));
 
     static const char* kLayoutQualifierNames[] = {
         "blend_support_screen",
         "blend_support_overlay",
         "blend_support_darken",
         "blend_support_lighten",
         "blend_support_colordodge",
@@ skipping 215 matching lines @@
 }
 
 const char* GrGLFragmentShaderBuilder::getSecondaryColorOutputName() const {
     return dual_source_output_name();
 }
 
 bool GrGLFragmentShaderBuilder::compileAndAttachShaders(GrGLuint programId,
                                                         SkTDArray<GrGLuint>* shaderIds) {
     GrGLGpu* gpu = fProgramBuilder->gpu();
     this->versionDecl() = GrGetGLSLVersionDecl(gpu->ctxInfo());
-    GrGLSLAppendDefaultFloatPrecisionDeclaration(kDefault_GrSLPrecision,
-                                                 gpu->glStandard(),
-                                                 &this->precisionQualifier());
+    append_default_precision_qualifier(kDefault_GrSLPrecision,
+                                       gpu->glStandard(),
+                                       &this->precisionQualifier());
     this->compileAndAppendLayoutQualifiers();
     fProgramBuilder->appendUniformDecls(GrGLProgramBuilder::kFragment_Visibility,
                                         &this->uniforms());
     this->appendDecls(fInputs, &this->inputs());
     // We shouldn't have declared outputs on 1.10
     SkASSERT(k110_GrGLSLGeneration != gpu->glslGeneration() || fOutputs.empty());
     this->appendDecls(fOutputs, &this->outputs());
     return this->finalize(programId, GR_GL_FRAGMENT_SHADER, shaderIds);
 }
 
 void GrGLFragmentShaderBuilder::bindFragmentShaderLocations(GrGLuint programID) {
     // ES 3.00 requires custom color output but doesn't support bindFragDataLocation
     if (fHasCustomColorOutput &&
         kGLES_GrGLStandard != fProgramBuilder->gpu()->ctxInfo().standard()) {
         GL_CALL(BindFragDataLocation(programID, 0, declared_color_output_name()));
     }
     if (fHasSecondaryOutput) {
         GL_CALL(BindFragDataLocationIndexed(programID, 0, 1, dual_source_output_name()));
     }
 }
 
 void GrGLFragmentShaderBuilder::addVarying(GrGLVarying* v, GrSLPrecision fsPrec) {
     v->fFsIn = v->fVsOut;
     if (v->fGsOut) {
         v->fFsIn = v->fGsOut;
     }
     fInputs.push_back().set(v->fType, GrGLShaderVar::kVaryingIn_TypeModifier, v->fFsIn, fsPrec);
 }