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1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/basictypes.h"
6#include "base/debug/trace_event.h"
7#include "base/logging.h"
8#include "base/memory/scoped_ptr.h"
9#include "ui/gl/gl_context_cgl.h"
10#include "ui/gl/gl_context_osmesa.h"
11#include "ui/gl/gl_context_stub.h"
12#include "ui/gl/gl_implementation.h"
13#include "ui/gl/gl_surface.h"
14#include "ui/gl/gl_switches.h"
15
16namespace gfx {
17
18class GLShareGroup;
19
20scoped_refptr<GLContext> GLContext::CreateGLContext(
21    GLShareGroup* share_group,
22    GLSurface* compatible_surface,
23    GpuPreference gpu_preference) {
24  TRACE_EVENT0("gpu", "GLContext::CreateGLContext");
25  switch (GetGLImplementation()) {
26    case kGLImplementationDesktopGL:
27    case kGLImplementationAppleGL: {
28      scoped_refptr<GLContext> context;
29      // Note that with virtualization we might still be able to make current
30      // a different onscreen surface with this context later. But we should
31      // always be creating the context with an offscreen surface first.
32      DCHECK(compatible_surface->IsOffscreen());
33      context = new GLContextCGL(share_group);
34      if (!context->Initialize(compatible_surface, gpu_preference))
35        return NULL;
36
37      return context;
38    }
39    case kGLImplementationOSMesaGL: {
40      scoped_refptr<GLContext> context(new GLContextOSMesa(share_group));
41      if (!context->Initialize(compatible_surface, gpu_preference))
42        return NULL;
43
44      return context;
45    }
46    case kGLImplementationMockGL:
47      return new GLContextStub;
48    default:
49      NOTREACHED();
50      return NULL;
51  }
52}
53
54}  // namespace gfx
55