Use glGetStringi to get extensions when available.

src/gpu/gl/GrGLUtil.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLUtil.h"
 
-
 void GrGLClearErr(const GrGLInterface* gl) {
     while (GR_GL_NO_ERROR != gl->fGetError()) {}
 }
 
 namespace {
 const char *get_error_string(uint32_t err) {
     switch (err) {
     case GR_GL_NO_ERROR:
         return "";
     case GR_GL_INVALID_ENUM:
@@ skipping 120 matching lines @@
     // android hack until the gpu vender updates their drivers
     n = sscanf(versionString, "OpenGL ES GLSL %d.%d", &major, &minor);
     if (2 == n) {
         return GR_GLSL_VER(major, minor);
     }
 #endif
 
     return 0;
 }
 
-bool GrGLHasExtensionFromString(const char* ext, const char* extensionString) {
-    int extLength = strlen(ext);
-
-    while (true) {
-        int n = strcspn(extensionString, " ");
-        if (n == extLength && 0 == strncmp(ext, extensionString, n)) {
-            return true;
-        }
-        if (0 == extensionString[n]) {
-            return false;
-        }
-        extensionString += n+1;
-    }
-
-    return false;
-}
-
 GrGLVendor GrGLGetVendorFromString(const char* vendorString) {
     if (NULL != vendorString) {
         if (0 == strcmp(vendorString, "ARM")) {
             return kARM_GrGLVendor;
         }
         if (0 == strcmp(vendorString, "Imagination Technologies")) {
             return kImagination_GrGLVendor;
         }
         if (0 == strcmp(vendorString, "Intel")) {
             return kIntel_GrGLVendor;
         }
     }
     return kOther_GrGLVendor;
 }
 
-bool GrGLHasExtension(const GrGLInterface* gl, const char* ext) {
-    const GrGLubyte* glstr;
-    GR_GL_CALL_RET(gl, glstr, GetString(GR_GL_EXTENSIONS));
-    return GrGLHasExtensionFromString(ext, (const char*) glstr);
-}
-
 GrGLBinding GrGLGetBindingInUse(const GrGLInterface* gl) {
     const GrGLubyte* v;
     GR_GL_CALL_RET(gl, v, GetString(GR_GL_VERSION));
     return GrGLGetBindingInUseFromString((const char*) v);
 }
 
 GrGLVersion GrGLGetVersion(const GrGLInterface* gl) {
     const GrGLubyte* v;
     GR_GL_CALL_RET(gl, v, GetString(GR_GL_VERSION));
     return GrGLGetVersionFromString((const char*) v);
 }
 
 GrGLSLVersion GrGLGetGLSLVersion(const GrGLInterface* gl) {
     const GrGLubyte* v;
     GR_GL_CALL_RET(gl, v, GetString(GR_GL_SHADING_LANGUAGE_VERSION));
     return GrGLGetGLSLVersionFromString((const char*) v);
 }
 
 GrGLVendor GrGLGetVendor(const GrGLInterface* gl) {
     const GrGLubyte* v;
     GR_GL_CALL_RET(gl, v, GetString(GR_GL_VENDOR));
     return GrGLGetVendorFromString((const char*) v);
 }