Exposed support for dynamically enabling extensions in command buffer...

gpu/command_buffer/service/feature_info.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <set>
 #include <string>
 #include "app/gfx/gl/gl_implementation.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "gpu/GLES2/gles2_command_buffer.h"
@@ skipping 197 matching lines @@
     AddExtensionString("GL_OES_texture_npot");
     npot_ok = true;
   }
 
   // Check if we should allow GL_OES_texture_float, GL_OES_texture_half_float,
   // GL_OES_texture_float_linear, GL_OES_texture_half_float_linear
   bool enable_texture_float = false;
   bool enable_texture_float_linear = false;
   bool enable_texture_half_float = false;
   bool enable_texture_half_float_linear = false;
-  if (ext.HaveAndDesire("GL_ARB_texture_float")) {
+
+  bool have_arb_texture_float = ext.Have("GL_ARB_texture_float");
+
+  if (have_arb_texture_float && ext.Desire("GL_ARB_texture_float")) {
     enable_texture_float = true;
     enable_texture_float_linear = true;
     enable_texture_half_float = true;
     enable_texture_half_float_linear = true;
   } else {
-    if (ext.HaveAndDesire("GL_OES_texture_float")) {
+    if (ext.HaveAndDesire("GL_OES_texture_float") ||
+        (have_arb_texture_float &&
+         ext.Desire("GL_OES_texture_float"))) {
       enable_texture_float = true;
-      if (ext.HaveAndDesire("GL_OES_texture_float_linear")) {
+      if (ext.HaveAndDesire("GL_OES_texture_float_linear") ||
+          (have_arb_texture_float &&
+           ext.Desire("GL_OES_texture_float_linear"))) {
         enable_texture_float_linear = true;
       }
     }
-    if (ext.HaveAndDesire("GL_OES_texture_half_float")) {
+    if (ext.HaveAndDesire("GL_OES_texture_half_float") ||
+        (have_arb_texture_float &&
+         ext.Desire("GL_OES_texture_half_float"))) {
       enable_texture_half_float = true;
-      if (ext.HaveAndDesire("GL_OES_texture_half_float_linear")) {
+      if (ext.HaveAndDesire("GL_OES_texture_half_float_linear") ||
+          (have_arb_texture_float &&
+           ext.Desire("GL_OES_texture_half_float_linear"))) {
         enable_texture_half_float_linear = true;
       }
     }
   }
 
   if (enable_texture_float) {
     validators_.pixel_type.AddValue(GL_FLOAT);
     AddExtensionString("GL_OES_texture_float");
     if (enable_texture_float_linear) {
       AddExtensionString("GL_OES_texture_float_linear");
@@ skipping 50 matching lines @@
   if (extensions_.find(str) == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu