Abandon offset support with texel buffers

src/gpu/gl/GrGLCaps.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 "GrGLCaps.h"
 
@@ skipping 727 matching lines @@
 
     if (kGL_GrGLStandard == standard) {
         glslCaps->fTexelFetchSupport = ctxInfo.glslGeneration() >= k130_GrGLSLGeneration;
     } else {
         glslCaps->fTexelFetchSupport =
             ctxInfo.glslGeneration() >= k330_GrGLSLGeneration; // We use this value for GLSL ES 3.0.
     }
 
     if (glslCaps->fTexelFetchSupport) {
         if (kGL_GrGLStandard == standard) {
-            glslCaps->fTexelBufferSupport = ctxInfo.version() >= GR_GL_VER(4, 3) &&
+            glslCaps->fTexelBufferSupport = ctxInfo.version() >= GR_GL_VER(3, 1) &&
                                             ctxInfo.glslGeneration() >= k330_GrGLSLGeneration;
         } else {
             if (ctxInfo.version() >= GR_GL_VER(3, 2) &&
                 ctxInfo.glslGeneration() >= k320es_GrGLSLGeneration) {
                 glslCaps->fTexelBufferSupport = true;
             } else if (ctxInfo.hasExtension("GL_OES_texture_buffer")) {
                 glslCaps->fTexelBufferSupport = true;
                 glslCaps->fTexelBufferExtensionString = "GL_OES_texture_buffer";
             } else if (ctxInfo.hasExtension("GL_EXT_texture_buffer")) {
                 glslCaps->fTexelBufferSupport = true;
@@ skipping 1151 matching lines @@
         for (int j = 0; j < kExternalFormatUsageCnt; ++j) {
             SkASSERT(defaultEntry.fFormats.fExternalFormat[j] !=
                      fConfigTable[i].fFormats.fExternalFormat[j]);
         }
         SkASSERT(defaultEntry.fFormats.fExternalType != fConfigTable[i].fFormats.fExternalType);
     }
 #endif
 }
 
 void GrGLCaps::onApplyOptionsOverrides(const GrContextOptions& options) {}