Add caps and GL API for buffer texture

src/gpu/glsl/GrGLSLCaps.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLSLCaps.h"
 
@@ skipping 11 matching lines @@
     fUsesPrecisionModifiers = false;
     fCanUseAnyFunctionInShader = true;
     fCanUseMinAndAbsTogether = true;
     fMustForceNegatedAtanParamToFloat = false;
     fFlatInterpolationSupport = false;
     fNoPerspectiveInterpolationSupport = false;
     fMultisampleInterpolationSupport = false;
     fSampleVariablesSupport = false;
     fSampleMaskOverrideCoverageSupport = false;
     fExternalTextureSupport = false;
+    fBufferTextureSupport = false;
     fVersionDeclString = nullptr;
     fShaderDerivativeExtensionString = nullptr;
     fFragCoordConventionsExtensionString = nullptr;
     fSecondaryOutputExtensionString = nullptr;
     fExternalTextureExtensionString = nullptr;
+    fBufferTextureExtensionString = nullptr;
     fNoPerspectiveInterpolationExtensionString = nullptr;
     fMultisampleInterpolationExtensionString = nullptr;
     fSampleVariablesExtensionString = nullptr;
     fFBFetchColorName = nullptr;
     fFBFetchExtensionString = nullptr;
     fMaxVertexSamplers = 0;
     fMaxGeometrySamplers = 0;
     fMaxFragmentSamplers = 0;
     fMaxCombinedSamplers = 0;
     fAdvBlendEqInteraction = kNotSupported_AdvBlendEqInteraction;
@@ skipping 26 matching lines @@
                                                                "YES" : "NO"));
     r.appendf("Flat interpolation support: %s\n", (fFlatInterpolationSupport ?  "YES" : "NO"));
     r.appendf("No perspective interpolation support: %s\n", (fNoPerspectiveInterpolationSupport ?
                                                              "YES" : "NO"));
     r.appendf("Multisample interpolation support: %s\n", (fMultisampleInterpolationSupport ?
                                                           "YES" : "NO"));
     r.appendf("Sample variables support: %s\n", (fSampleVariablesSupport ? "YES" : "NO"));
     r.appendf("Sample mask override coverage support: %s\n", (fSampleMaskOverrideCoverageSupport ?
                                                               "YES" : "NO"));
     r.appendf("External texture support: %s\n", (fExternalTextureSupport ? "YES" : "NO"));
+    r.appendf("Buffer texture support: %s\n", (fBufferTextureSupport ? "YES" : "NO"));
     r.appendf("Max VS Samplers: %d\n", fMaxVertexSamplers);
     r.appendf("Max GS Samplers: %d\n", fMaxGeometrySamplers);
     r.appendf("Max FS Samplers: %d\n", fMaxFragmentSamplers);
     r.appendf("Max Combined Samplers: %d\n", fMaxFragmentSamplers);
     r.appendf("Advanced blend equation interaction: %s\n",
               kAdvBlendEqInteractionStr[fAdvBlendEqInteraction]);
     return r;
 }
 
 void GrGLSLCaps::onApplyOptionsOverrides(const GrContextOptions& options) {
 }