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

gpu/command_buffer/client/gles2_implementation.cc

 // Copyright (c) 2009 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.
 
 // A class to emluate GLES2 over command buffers.
 
 #include "../client/gles2_implementation.h"
 #include <GLES2/gles2_command_buffer.h>
 #include "../client/mapped_memory.h"
 #include "../common/gles2_cmd_utils.h"
@@ skipping 1563 matching lines @@
     return;
   }
   const MappedTexture& mt = it->second;
   helper_->TexSubImage2D(
       mt.target, mt.level, mt.xoffset, mt.yoffset, mt.width, mt.height,
       mt.format, mt.type, mt.shm_id, mt.shm_offset);
   mapped_memory_->FreePendingToken(mt.shm_memory, helper_->InsertToken());
   mapped_textures_.erase(it);
 }
 
+const GLchar* GLES2Implementation::GetRequestableExtensionsCHROMIUM() {
+  const char* result = NULL;
+  // Clear the bucket so if the command fails nothing will be in it.
+  helper_->SetBucketSize(kResultBucketId, 0);
+  helper_->GetRequestableExtensionsCHROMIUM(kResultBucketId);
+  std::string str;
+  if (GetBucketAsString(kResultBucketId, &str)) {
+    // The set of requestable extensions shrinks as we enable
+    // them. Because we don't know when the client will stop referring
+    // to a previous one it queries (see GetString) we need to cache
+    // the unique results.
+    std::set<std::string>::const_iterator sit =
+        requestable_extensions_set_.find(str);
+    if (sit != requestable_extensions_set_.end()) {
+      result = sit->c_str();
+    } else {
+      std::pair<std::set<std::string>::const_iterator, bool> insert_result =
+          requestable_extensions_set_.insert(str);
+      GPU_DCHECK(insert_result.second);
+      result = insert_result.first->c_str();
+    }
+  }
+  return reinterpret_cast<const GLchar*>(result);
+}
+
+void GLES2Implementation::RequestExtensionCHROMIUM(const char* extension) {
+  SetBucketAsCString(kResultBucketId, extension);
+  helper_->RequestExtensionCHROMIUM(kResultBucketId);
+  helper_->SetBucketSize(kResultBucketId, 0);
+}
+
 }  // namespace gles2
 }  // namespace gpu