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_gl_api_implementation.h"
14 #include "ui/gl/gl_implementation.h"
15 #include "ui/gl/gl_osmesa_api_implementation.h"
16
17 namespace gfx {
18 namespace {
19 const char kOpenGLFrameworkPath[] =
20 "/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL";
21 } // namespace
22
GetAllowedGLImplementations(std::vector<GLImplementation> * impls)23 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
24 impls->push_back(kGLImplementationDesktopGL);
25 impls->push_back(kGLImplementationAppleGL);
26 impls->push_back(kGLImplementationOSMesaGL);
27 }
28
InitializeGLBindings(GLImplementation implementation)29 bool InitializeGLBindings(GLImplementation implementation) {
30 // Prevent reinitialization with a different implementation. Once the gpu
31 // unit tests have initialized with kGLImplementationMock, we don't want to
32 // later switch to another GL implementation.
33 if (GetGLImplementation() != kGLImplementationNone)
34 return true;
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 InitializeGLBindingsGL();
81 InitializeGLBindingsOSMESA();
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 InitializeGLBindingsGL();
97 break;
98 }
99 case kGLImplementationMockGL: {
100 SetGLGetProcAddressProc(GetMockGLProcAddress);
101 SetGLImplementation(kGLImplementationMockGL);
102 InitializeGLBindingsGL();
103 break;
104 }
105 default:
106 return false;
107 }
108
109 return true;
110 }
111
InitializeGLExtensionBindings(GLImplementation implementation,GLContext * context)112 bool InitializeGLExtensionBindings(GLImplementation implementation,
113 GLContext* context) {
114 switch (implementation) {
115 case kGLImplementationOSMesaGL:
116 InitializeGLExtensionBindingsGL(context);
117 InitializeGLExtensionBindingsOSMESA(context);
118 break;
119 case kGLImplementationDesktopGL:
120 case kGLImplementationAppleGL:
121 InitializeGLExtensionBindingsGL(context);
122 break;
123 case kGLImplementationMockGL:
124 InitializeGLExtensionBindingsGL(context);
125 break;
126 default:
127 return false;
128 }
129
130 return true;
131 }
132
InitializeDebugGLBindings()133 void InitializeDebugGLBindings() {
134 InitializeDebugGLBindingsGL();
135 InitializeDebugGLBindingsOSMESA();
136 }
137
ClearGLBindings()138 void ClearGLBindings() {
139 ClearGLBindingsGL();
140 ClearGLBindingsOSMESA();
141 SetGLImplementation(kGLImplementationNone);
142
143 UnloadGLNativeLibraries();
144 }
145
GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo * info)146 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
147 return false;
148 }
149
150 } // namespace gfx
151