Adding 3D lut color filter

src/gpu/gl/builders/GrGLProgramBuilder.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 "gl/GrGLProgram.h"
 #include "gl/GrGLSLPrettyPrint.h"
 #include "gl/GrGLUniformHandle.h"
@@ skipping 201 matching lines @@
 
 void GrGLProgramBuilder::emitSamplers(const GrProcessor& effect,
                                       GrGLProcessor::TextureSamplerArray* outSamplers) {
     SkTArray<GrGLProgramEffects::Sampler, true>& samplers =
             this->getProgramEffects()->addSamplers();
     int numTextures = effect.numTextures();
     samplers.push_back_n(numTextures);
     SkString name;
     for (int t = 0; t < numTextures; ++t) {
         name.printf("Sampler%d", t);
+        const GrTextureAccess& ta = effect.textureAccess(t);
+        const GrTexture* tex = ta.getTexture();
+        bool is3D = (tex != NULL) && (tex->desc().fDepth > 0);
         samplers[t].fUniform = this->addUniform(GrGLProgramBuilder::kFragment_Visibility,
-                                                kSampler2D_GrSLType,
+                                                is3D ? kSampler3D_GrSLType : kSampler2D_GrSLType,
                                                 name.c_str());
         SkNEW_APPEND_TO_TARRAY(outSamplers, GrGLProcessor::TextureSampler,
-                               (samplers[t].fUniform, effect.textureAccess(t)));
+                               (samplers[t].fUniform, ta));
     }
 }
 
 bool GrGLProgramBuilder::finish() {
     SkASSERT(0 == fProgramID);
     GL_CALL_RET(fProgramID, CreateProgram());
     if (!fProgramID) {
         return false;
     }
 
@@ skipping 84 matching lines @@
                     GetProgramResourceLocation(programId,
                                                GR_GL_FRAGMENT_INPUT,
                                                fSeparableVaryingInfos[i].fVariable.c_str()));
         fSeparableVaryingInfos[i].fLocation = location;
     }
 }
 
 const GrGLContextInfo& GrGLProgramBuilder::ctxInfo() const {
     return fGpu->ctxInfo();
 }