text: // 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 "ui/gl/gl_context.h"
  
  #include "base/debug/trace_event.h"
  #include "base/logging.h"
  #include "base/memory/scoped_ptr.h"
  #include "third_party/mesa/MesaLib/include/GL/osmesa.h"
  #include "ui/gl/gl_bindings.h"
  #include "ui/gl/gl_context_egl.h"
  #include "ui/gl/gl_context_osmesa.h"
  #include "ui/gl/gl_context_stub.h"
  #include "ui/gl/gl_context_wgl.h"
  #include "ui/gl/gl_implementation.h"
  #include "ui/gl/gl_surface_egl.h"
  #include "ui/gl/gl_surface_osmesa.h"
  #include "ui/gl/gl_surface_stub.h"
  #include "ui/gl/gl_surface_wgl.h"
  
  namespace gfx {
  
  scoped_refptr<GLContext> GLContext::CreateGLContext(
      GLShareGroup* share_group,
      GLSurface* compatible_surface,
      GpuPreference gpu_preference) {
    TRACE_EVENT0("gpu", "GLContext::CreateGLContext");
    switch (GetGLImplementation()) {
      case kGLImplementationOSMesaGL: {
        scoped_refptr<GLContext> context(new GLContextOSMesa(share_group));
        if (!context->Initialize(compatible_surface, gpu_preference))
          return NULL;
  
        return context;
      }
      case kGLImplementationEGLGLES2: {
        scoped_refptr<GLContext> context(new GLContextEGL(share_group));
        if (!context->Initialize(compatible_surface, gpu_preference))
          return NULL;
  
        return context;
      }
      case kGLImplementationDesktopGL: {
        scoped_refptr<GLContext> context(new GLContextWGL(share_group));
        if (!context->Initialize(compatible_surface, gpu_preference))
          return NULL;
  
        return context;
      }
      case kGLImplementationMockGL:
        return new GLContextStub;
      default:
        NOTREACHED();
        return NULL;
    }
  }
  
  bool GLContext::SupportsDualGpus() {
    return false;
  }
  
  }  // namespace gfx
  