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 <vector>
6
7 #include "base/command_line.h"
8 #include "base/logging.h"
9 #include "base/threading/thread_restrictions.h"
10 #include "ui/gl/gl_bindings.h"
11 #include "ui/gl/gl_context_stub_with_extensions.h"
12 #include "ui/gl/gl_egl_api_implementation.h"
13 #include "ui/gl/gl_gl_api_implementation.h"
14 #include "ui/gl/gl_glx_api_implementation.h"
15 #include "ui/gl/gl_implementation.h"
16 #include "ui/gl/gl_implementation_osmesa.h"
17 #include "ui/gl/gl_osmesa_api_implementation.h"
18 #include "ui/gl/gl_switches.h"
19
20 namespace gfx {
21 namespace {
22
23 // TODO(piman): it should be Desktop GL marshalling from double to float. Today
24 // on native GLES, we do float->double->float.
MarshalClearDepthToClearDepthf(GLclampd depth)25 void GL_BINDING_CALL MarshalClearDepthToClearDepthf(GLclampd depth) {
26 glClearDepthf(static_cast<GLclampf>(depth));
27 }
28
MarshalDepthRangeToDepthRangef(GLclampd z_near,GLclampd z_far)29 void GL_BINDING_CALL MarshalDepthRangeToDepthRangef(GLclampd z_near,
30 GLclampd z_far) {
31 glDepthRangef(static_cast<GLclampf>(z_near), static_cast<GLclampf>(z_far));
32 }
33
34 #if defined(OS_OPENBSD)
35 const char kGLLibraryName[] = "libGL.so";
36 #else
37 const char kGLLibraryName[] = "libGL.so.1";
38 #endif
39
40 const char kGLESv2LibraryName[] = "libGLESv2.so.2";
41 const char kEGLLibraryName[] = "libEGL.so.1";
42
43 } // namespace
44
GetAllowedGLImplementations(std::vector<GLImplementation> * impls)45 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
46 impls->push_back(kGLImplementationDesktopGL);
47 impls->push_back(kGLImplementationEGLGLES2);
48 impls->push_back(kGLImplementationOSMesaGL);
49 }
50
InitializeStaticGLBindings(GLImplementation implementation)51 bool InitializeStaticGLBindings(GLImplementation implementation) {
52 // Prevent reinitialization with a different implementation. Once the gpu
53 // unit tests have initialized with kGLImplementationMock, we don't want to
54 // later switch to another GL implementation.
55 DCHECK_EQ(kGLImplementationNone, GetGLImplementation());
56
57 // Allow the main thread or another to initialize these bindings
58 // after instituting restrictions on I/O. Going forward they will
59 // likely be used in the browser process on most platforms. The
60 // one-time initialization cost is small, between 2 and 5 ms.
61 base::ThreadRestrictions::ScopedAllowIO allow_io;
62
63 switch (implementation) {
64 case kGLImplementationOSMesaGL:
65 return InitializeStaticGLBindingsOSMesaGL();
66 case kGLImplementationDesktopGL: {
67 base::NativeLibrary library = NULL;
68 const CommandLine* command_line = CommandLine::ForCurrentProcess();
69
70 if (command_line->HasSwitch(switches::kTestGLLib))
71 library = LoadLibraryAndPrintError(
72 command_line->GetSwitchValueASCII(switches::kTestGLLib).c_str());
73
74 if (!library) {
75 library = LoadLibraryAndPrintError(kGLLibraryName);
76 }
77
78 if (!library)
79 return false;
80
81 GLGetProcAddressProc get_proc_address =
82 reinterpret_cast<GLGetProcAddressProc>(
83 base::GetFunctionPointerFromNativeLibrary(
84 library, "glXGetProcAddress"));
85 if (!get_proc_address) {
86 LOG(ERROR) << "glxGetProcAddress not found.";
87 base::UnloadNativeLibrary(library);
88 return false;
89 }
90
91 SetGLGetProcAddressProc(get_proc_address);
92 AddGLNativeLibrary(library);
93 SetGLImplementation(kGLImplementationDesktopGL);
94
95 InitializeStaticGLBindingsGL();
96 InitializeStaticGLBindingsGLX();
97 break;
98 }
99 case kGLImplementationEGLGLES2: {
100 base::NativeLibrary gles_library =
101 LoadLibraryAndPrintError(kGLESv2LibraryName);
102 if (!gles_library)
103 return false;
104 base::NativeLibrary egl_library =
105 LoadLibraryAndPrintError(kEGLLibraryName);
106 if (!egl_library) {
107 base::UnloadNativeLibrary(gles_library);
108 return false;
109 }
110
111 GLGetProcAddressProc get_proc_address =
112 reinterpret_cast<GLGetProcAddressProc>(
113 base::GetFunctionPointerFromNativeLibrary(
114 egl_library, "eglGetProcAddress"));
115 if (!get_proc_address) {
116 LOG(ERROR) << "eglGetProcAddress not found.";
117 base::UnloadNativeLibrary(egl_library);
118 base::UnloadNativeLibrary(gles_library);
119 return false;
120 }
121
122 SetGLGetProcAddressProc(get_proc_address);
123 AddGLNativeLibrary(egl_library);
124 AddGLNativeLibrary(gles_library);
125 SetGLImplementation(kGLImplementationEGLGLES2);
126
127 InitializeStaticGLBindingsGL();
128 InitializeStaticGLBindingsEGL();
129
130 // These two functions take single precision float rather than double
131 // precision float parameters in GLES.
132 ::gfx::g_driver_gl.fn.glClearDepthFn = MarshalClearDepthToClearDepthf;
133 ::gfx::g_driver_gl.fn.glDepthRangeFn = MarshalDepthRangeToDepthRangef;
134 break;
135 }
136 case kGLImplementationMockGL: {
137 SetGLImplementation(kGLImplementationMockGL);
138 InitializeStaticGLBindingsGL();
139 break;
140 }
141 default:
142 return false;
143 }
144
145
146 return true;
147 }
148
InitializeDynamicGLBindings(GLImplementation implementation,GLContext * context)149 bool InitializeDynamicGLBindings(GLImplementation implementation,
150 GLContext* context) {
151 switch (implementation) {
152 case kGLImplementationOSMesaGL:
153 InitializeDynamicGLBindingsGL(context);
154 InitializeDynamicGLBindingsOSMESA(context);
155 break;
156 case kGLImplementationDesktopGL:
157 InitializeDynamicGLBindingsGL(context);
158 InitializeDynamicGLBindingsGLX(context);
159 break;
160 case kGLImplementationEGLGLES2:
161 InitializeDynamicGLBindingsGL(context);
162 InitializeDynamicGLBindingsEGL(context);
163 break;
164 case kGLImplementationMockGL:
165 if (!context) {
166 scoped_refptr<GLContextStubWithExtensions> mock_context(
167 new GLContextStubWithExtensions());
168 mock_context->SetGLVersionString("3.0");
169 InitializeDynamicGLBindingsGL(mock_context.get());
170 } else
171 InitializeDynamicGLBindingsGL(context);
172 break;
173 default:
174 return false;
175 }
176
177 return true;
178 }
179
InitializeDebugGLBindings()180 void InitializeDebugGLBindings() {
181 InitializeDebugGLBindingsEGL();
182 InitializeDebugGLBindingsGL();
183 InitializeDebugGLBindingsGLX();
184 InitializeDebugGLBindingsOSMESA();
185 }
186
ClearGLBindings()187 void ClearGLBindings() {
188 ClearGLBindingsEGL();
189 ClearGLBindingsGL();
190 ClearGLBindingsGLX();
191 ClearGLBindingsOSMESA();
192 SetGLImplementation(kGLImplementationNone);
193
194 UnloadGLNativeLibraries();
195 }
196
GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo * info)197 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
198 switch (GetGLImplementation()) {
199 case kGLImplementationDesktopGL:
200 return GetGLWindowSystemBindingInfoGLX(info);
201 case kGLImplementationEGLGLES2:
202 return GetGLWindowSystemBindingInfoEGL(info);
203 default:
204 return false;
205 }
206 return false;
207 }
208
209 } // namespace gfx
210