Chromium implementation of discardBackbuffer WebGraphicsContext3D extension.

gpu/command_buffer/service/feature_info.cc

 // Copyright (c) 2012 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 "gpu/command_buffer/service/feature_info.h"
 
 #include <set>
 
 #include "base/string_number_conversions.h"
 #include "gpu/command_buffer/service/gl_utils.h"
@@ skipping 100 matching lines @@
 
   bool npot_ok = false;
 
   AddExtensionString("GL_CHROMIUM_resource_safe");
   AddExtensionString("GL_CHROMIUM_resize");
   AddExtensionString("GL_CHROMIUM_strict_attribs");
   AddExtensionString("GL_CHROMIUM_swapbuffers_complete_callback");
   AddExtensionString("GL_CHROMIUM_rate_limit_offscreen_context");
   AddExtensionString("GL_CHROMIUM_set_visibility");
   AddExtensionString("GL_CHROMIUM_gpu_memory_manager");
+  AddExtensionString("GL_EXT_discard_framebuffer");

[mmocny, 2012/03/21 20:13:52]

Since we aren't following the extension precisely as described, should I name
this differently for now?

[apatrick_chromium, 2012/03/22 21:03:49]

Maybe CHROMIUM_discard_framebuffer for now. Also, since gles2_cmd_decoder.cc
does not actually implement this extension, maybe it should be advertised
somewhere higher up the stack? Although I see a bunch of other one's that might
already be in the same boat. I'm happy to go with rename or don't advertise at
all for now if you want.

   AddExtensionString("GL_CHROMIUM_command_buffer_query");
   AddExtensionString("GL_ANGLE_translated_shader_source");
 
   if (ext.Have("GL_ANGLE_translated_shader_source")) {
     feature_flags_.angle_translated_shader_source = true;
   }
 
   // Only turn this feature on if it is requested. Not by default.
   if (desired_features && ext.Desire("GL_CHROMIUM_webglsl")) {
     AddExtensionString("GL_CHROMIUM_webglsl");
@@ skipping 332 matching lines @@
 }
 
 void FeatureInfo::AddExtensionString(const std::string& str) {
   if (extensions_.find(str) == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu