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/base_paths.h"
6#include "base/files/file_path.h"
7#include "base/logging.h"
8#include "base/mac/foundation_util.h"
9#include "base/native_library.h"
10#include "base/path_service.h"
11#include "base/threading/thread_restrictions.h"
12#include "ui/gl/gl_bindings.h"
13#include "ui/gl/gl_context_stub_with_extensions.h"
14#include "ui/gl/gl_gl_api_implementation.h"
15#include "ui/gl/gl_implementation.h"
16#include "ui/gl/gl_osmesa_api_implementation.h"
17
18namespace gfx {
19namespace {
20const char kOpenGLFrameworkPath[] =
21    "/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL";
22}  // namespace
23
24void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
25  impls->push_back(kGLImplementationDesktopGL);
26  impls->push_back(kGLImplementationAppleGL);
27  impls->push_back(kGLImplementationOSMesaGL);
28}
29
30bool InitializeStaticGLBindings(GLImplementation implementation) {
31  // Prevent reinitialization with a different implementation. Once the gpu
32  // unit tests have initialized with kGLImplementationMock, we don't want to
33  // later switch to another GL implementation.
34  DCHECK_EQ(kGLImplementationNone, GetGLImplementation());
35
36  // Allow the main thread or another to initialize these bindings
37  // after instituting restrictions on I/O. Going forward they will
38  // likely be used in the browser process on most platforms. The
39  // one-time initialization cost is small, between 2 and 5 ms.
40  base::ThreadRestrictions::ScopedAllowIO allow_io;
41
42  switch (implementation) {
43    case kGLImplementationOSMesaGL: {
44      // osmesa.so is located in the build directory. This code path is only
45      // valid in a developer build environment.
46      base::FilePath exe_path;
47      if (!PathService::Get(base::FILE_EXE, &exe_path)) {
48        LOG(ERROR) << "PathService::Get failed.";
49        return false;
50      }
51      base::FilePath bundle_path = base::mac::GetAppBundlePath(exe_path);
52      // Some unit test targets depend on osmesa but aren't built as app
53      // bundles. In that case, the .so is next to the executable.
54      if (bundle_path.empty())
55        bundle_path = exe_path;
56      base::FilePath build_dir_path = bundle_path.DirName();
57      base::FilePath osmesa_path = build_dir_path.Append("osmesa.so");
58
59      // When using OSMesa, just use OSMesaGetProcAddress to find entry points.
60      base::NativeLibrary library = base::LoadNativeLibrary(osmesa_path, NULL);
61      if (!library) {
62        LOG(ERROR) << "osmesa.so not found at " << osmesa_path.value();
63        return false;
64      }
65
66      GLGetProcAddressProc get_proc_address =
67          reinterpret_cast<GLGetProcAddressProc>(
68              base::GetFunctionPointerFromNativeLibrary(
69                  library, "OSMesaGetProcAddress"));
70      if (!get_proc_address) {
71        LOG(ERROR) << "OSMesaGetProcAddress not found.";
72        base::UnloadNativeLibrary(library);
73        return false;
74      }
75
76      SetGLGetProcAddressProc(get_proc_address);
77      AddGLNativeLibrary(library);
78      SetGLImplementation(kGLImplementationOSMesaGL);
79
80      InitializeStaticGLBindingsGL();
81      InitializeStaticGLBindingsOSMESA();
82      break;
83    }
84    case kGLImplementationDesktopGL:
85    case kGLImplementationAppleGL: {
86      base::NativeLibrary library = base::LoadNativeLibrary(
87          base::FilePath(kOpenGLFrameworkPath), NULL);
88      if (!library) {
89        LOG(ERROR) << "OpenGL framework not found";
90        return false;
91      }
92
93      AddGLNativeLibrary(library);
94      SetGLImplementation(implementation);
95
96      InitializeStaticGLBindingsGL();
97      break;
98    }
99    case kGLImplementationMockGL: {
100      SetGLImplementation(kGLImplementationMockGL);
101      InitializeStaticGLBindingsGL();
102      break;
103    }
104    default:
105      return false;
106  }
107
108  return true;
109}
110
111bool InitializeDynamicGLBindings(GLImplementation implementation,
112    GLContext* context) {
113  switch (implementation) {
114    case kGLImplementationOSMesaGL:
115      InitializeDynamicGLBindingsGL(context);
116      InitializeDynamicGLBindingsOSMESA(context);
117      break;
118    case kGLImplementationDesktopGL:
119    case kGLImplementationAppleGL:
120      InitializeDynamicGLBindingsGL(context);
121      break;
122    case kGLImplementationMockGL:
123      if (!context) {
124        scoped_refptr<GLContextStubWithExtensions> mock_context(
125            new GLContextStubWithExtensions());
126        mock_context->SetGLVersionString("3.0");
127        InitializeDynamicGLBindingsGL(mock_context.get());
128      } else
129        InitializeDynamicGLBindingsGL(context);
130      break;
131    default:
132      return false;
133  }
134
135  return true;
136}
137
138void InitializeDebugGLBindings() {
139  InitializeDebugGLBindingsGL();
140  InitializeDebugGLBindingsOSMESA();
141}
142
143void ClearGLBindings() {
144  ClearGLBindingsGL();
145  ClearGLBindingsOSMESA();
146  SetGLImplementation(kGLImplementationNone);
147
148  UnloadGLNativeLibraries();
149}
150
151bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
152  return false;
153}
154
155}  // namespace gfx
156