Add GLSL support for texelFetch

src/gpu/GrCaps.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrCaps.h"
 #include "GrContextOptions.h"
 
 GrShaderCaps::GrShaderCaps() {
     fShaderDerivativeSupport = false;
     fGeometryShaderSupport = false;
     fPathRenderingSupport = false;
     fDstReadInShaderSupport = false;
     fDualSourceBlendingSupport = false;
     fIntegerSupport = false;
+    fTexelBufferSupport = false;
     fShaderPrecisionVaries = false;
 }
 
 static const char* shader_type_to_string(GrShaderType type) {
     switch (type) {
     case kVertex_GrShaderType:
         return "vertex";
     case kGeometry_GrShaderType:
         return "geometry";
     case kFragment_GrShaderType:
@@ skipping 16 matching lines @@
 
 SkString GrShaderCaps::dump() const {
     SkString r;
     static const char* gNY[] = { "NO", "YES" };
     r.appendf("Shader Derivative Support          : %s\n", gNY[fShaderDerivativeSupport]);
     r.appendf("Geometry Shader Support            : %s\n", gNY[fGeometryShaderSupport]);
     r.appendf("Path Rendering Support             : %s\n", gNY[fPathRenderingSupport]);
     r.appendf("Dst Read In Shader Support         : %s\n", gNY[fDstReadInShaderSupport]);
     r.appendf("Dual Source Blending Support       : %s\n", gNY[fDualSourceBlendingSupport]);
     r.appendf("Integer Support                    : %s\n", gNY[fIntegerSupport]);
+    r.appendf("Texel Buffer Support               : %s\n", gNY[fTexelBufferSupport]);
 
     r.appendf("Shader Float Precisions (varies: %s):\n", gNY[fShaderPrecisionVaries]);
 
     for (int s = 0; s < kGrShaderTypeCount; ++s) {
         GrShaderType shaderType = static_cast<GrShaderType>(s);
         r.appendf("\t%s:\n", shader_type_to_string(shaderType));
         for (int p = 0; p < kGrSLPrecisionCount; ++p) {
             if (fFloatPrecisions[s][p].supported()) {
                 GrSLPrecision precision = static_cast<GrSLPrecision>(p);
                 r.appendf("\t\t%s: log_low: %d log_high: %d bits: %d\n",
@@ skipping 192 matching lines @@
 
     for (size_t i = 1; i < SK_ARRAY_COUNT(kConfigNames); ++i)  {
         GrPixelConfig config = static_cast<GrPixelConfig>(i);
         r.appendf("%s is uploadable to a texture: %s\n",
                   kConfigNames[i],
                   gNY[this->isConfigTexturable(config)]);
     }
 
     return r;
 }