Adds support for EXT_framebuffer_multisample...

gpu/command_buffer/service/context_group.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 "app/gfx/gl/gl_implementation.h"
 #include "gpu/command_buffer/service/context_group.h"
 #include "gpu/command_buffer/common/id_allocator.h"
 #include "gpu/command_buffer/service/buffer_manager.h"
 #include "gpu/command_buffer/service/framebuffer_manager.h"
 #include "gpu/command_buffer/service/program_manager.h"
@@ skipping 124 matching lines @@
   }
 
   if (enable_texture_half_float) {
     validators_.pixel_type.AddValue(GL_HALF_FLOAT_OES);
     AddExtensionString("GL_OES_texture_half_float");
     if (enable_texture_half_float_linear) {
       AddExtensionString("GL_OES_texture_half_float_linear");
     }
   }
 
+  // Check for multisample support
+  if (strstr(extensions, "GL_EXT_framebuffer_multisample")) {
+    extension_flags_.ext_framebuffer_multisample = true;
+    validators_.frame_buffer_target.AddValue(GL_READ_FRAMEBUFFER_EXT);
+    validators_.frame_buffer_target.AddValue(GL_DRAW_FRAMEBUFFER_EXT);
+    validators_.g_l_state.AddValue(GL_READ_FRAMEBUFFER_BINDING_EXT);
+    validators_.g_l_state.AddValue(GL_DRAW_FRAMEBUFFER_BINDING_EXT);
+    validators_.render_buffer_parameter.AddValue(GL_MAX_SAMPLES_EXT);
+    AddExtensionString("GL_EXT_framebuffer_multisample");
+    AddExtensionString("GL_EXT_framebuffer_blit");
+  }
+
   // TODO(gman): Add support for these extensions.
   //     GL_OES_depth24
   //     GL_OES_depth32
   //     GL_OES_packed_depth_stencil
   //     GL_OES_element_index_uint
 
   buffer_manager_.reset(new BufferManager());
   framebuffer_manager_.reset(new FramebufferManager());
   renderbuffer_manager_.reset(new RenderbufferManager());
   shader_manager_.reset(new ShaderManager());
@@ skipping 86 matching lines @@
   }
   IdAllocator* id_allocator = new IdAllocator();
   id_namespaces_[namespace_id] = linked_ptr<IdAllocator>(id_allocator);
   return id_allocator;
 }
 
 }  // namespace gles2
 }  // namespace gpu