Create GLSLUniformHandler class for gpu backend

src/gpu/glsl/GrGLSLXferProcessor.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 "glsl/GrGLSLXferProcessor.h"
 
 #include "GrXferProcessor.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
-#include "glsl/GrGLSLProgramBuilder.h"
 #include "glsl/GrGLSLProgramDataManager.h"
+#include "glsl/GrGLSLUniformHandler.h"
 
 void GrGLSLXferProcessor::emitCode(const EmitArgs& args) {
     if (!args.fXP.willReadDstColor()) {
         this->emitOutputsForBlendState(args);
         return;
     }
 
     GrGLSLXPFragmentBuilder* fragBuilder = args.fXPFragBuilder;
+    GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
     const char* dstColor = fragBuilder->dstColor();
 
     if (args.fXP.getDstTexture()) {
         bool topDown = kTopLeft_GrSurfaceOrigin == args.fXP.getDstTexture()->origin();
 
         if (args.fInputCoverage) {
             // We don't think any shaders actually output negative coverage, but just as a safety
             // check for floating point precision errors we compare with <= here
             fragBuilder->codeAppendf("if (all(lessThanEqual(%s, vec4(0)))) {"
                                      "    discard;"
                                      "}", args.fInputCoverage);
         }
 
         const char* dstTopLeftName;
         const char* dstCoordScaleName;
 
-        fDstTopLeftUni = args.fPB->addUniform(GrGLSLProgramBuilder::kFragment_Visibility,
-                                              kVec2f_GrSLType,
-                                              kDefault_GrSLPrecision,
-                                              "DstTextureUpperLeft",
-                                              &dstTopLeftName);
-        fDstScaleUni = args.fPB->addUniform(GrGLSLProgramBuilder::kFragment_Visibility,
-                                            kVec2f_GrSLType,
-                                            kDefault_GrSLPrecision,
-                                            "DstTextureCoordScale",
-                                            &dstCoordScaleName);
+        fDstTopLeftUni = uniformHandler->addUniform(GrGLSLUniformHandler::kFragment_Visibility,
+                                                    kVec2f_GrSLType,
+                                                    kDefault_GrSLPrecision,
+                                                    "DstTextureUpperLeft",
+                                                    &dstTopLeftName);
+        fDstScaleUni = uniformHandler->addUniform(GrGLSLUniformHandler::kFragment_Visibility,
+                                                  kVec2f_GrSLType,
+                                                  kDefault_GrSLPrecision,
+                                                  "DstTextureCoordScale",
+                                                  &dstCoordScaleName);
         const char* fragPos = fragBuilder->fragmentPosition();
 
         fragBuilder->codeAppend("// Read color from copy of the destination.\n");
         fragBuilder->codeAppendf("vec2 _dstTexCoord = (%s.xy - %s) * %s;",
                                  fragPos, dstTopLeftName, dstCoordScaleName);
 
         if (!topDown) {
             fragBuilder->codeAppend("_dstTexCoord.y = 1.0 - _dstTexCoord.y;");
         }
 
         fragBuilder->codeAppendf("vec4 %s = ", dstColor);
         fragBuilder->appendTextureLookup(args.fSamplers[0], "_dstTexCoord", kVec2f_GrSLType);
         fragBuilder->codeAppend(";");
     }
 
-    this->emitBlendCodeForDstRead(args.fPB,
-                                  fragBuilder,
+    this->emitBlendCodeForDstRead(fragBuilder,
+                                  uniformHandler,
                                   args.fInputColor,
                                   args.fInputCoverage,
                                   dstColor,
                                   args.fOutputPrimary,
                                   args.fOutputSecondary,
                                   args.fXP);
 }
 
 void GrGLSLXferProcessor::setData(const GrGLSLProgramDataManager& pdm, const GrXferProcessor& xp) {
     if (xp.getDstTexture()) {
         if (fDstTopLeftUni.isValid()) {
             pdm.set2f(fDstTopLeftUni, static_cast<float>(xp.dstTextureOffset().fX),
                       static_cast<float>(xp.dstTextureOffset().fY));
             pdm.set2f(fDstScaleUni, 1.f / xp.getDstTexture()->width(),
                       1.f / xp.getDstTexture()->height());
         } else {
             SkASSERT(!fDstScaleUni.isValid());
         }
     } else {
         SkASSERT(!fDstTopLeftUni.isValid());
         SkASSERT(!fDstScaleUni.isValid());
     }
     this->onSetData(pdm, xp);
 }