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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/base_paths.h"
6 #include "base/command_line.h"
7 #include "base/files/file_path.h"
8 #include "base/logging.h"
9 #include "base/native_library.h"
10 #include "base/path_service.h"
11 #include "ui/gl/gl_bindings.h"
12 #include "ui/gl/gl_context_stub_with_extensions.h"
13 #include "ui/gl/gl_egl_api_implementation.h"
14 #include "ui/gl/gl_gl_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 
19 namespace gfx {
20 
21 namespace {
22 
MarshalClearDepthToClearDepthf(GLclampd depth)23 void GL_BINDING_CALL MarshalClearDepthToClearDepthf(GLclampd depth) {
24   glClearDepthf(static_cast<GLclampf>(depth));
25 }
26 
MarshalDepthRangeToDepthRangef(GLclampd z_near,GLclampd z_far)27 void GL_BINDING_CALL MarshalDepthRangeToDepthRangef(GLclampd z_near,
28                                                     GLclampd z_far) {
29   glDepthRangef(static_cast<GLclampf>(z_near), static_cast<GLclampf>(z_far));
30 }
31 
32 }  // namespace
33 
GetAllowedGLImplementations(std::vector<GLImplementation> * impls)34 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
35   impls->push_back(kGLImplementationEGLGLES2);
36   impls->push_back(kGLImplementationOSMesaGL);
37 }
38 
InitializeStaticGLBindings(GLImplementation implementation)39 bool InitializeStaticGLBindings(GLImplementation implementation) {
40   // Prevent reinitialization with a different implementation. Once the gpu
41   // unit tests have initialized with kGLImplementationMock, we don't want to
42   // later switch to another GL implementation.
43   DCHECK_EQ(kGLImplementationNone, GetGLImplementation());
44 
45   switch (implementation) {
46     case kGLImplementationEGLGLES2: {
47       base::NativeLibrary gles_library =
48           LoadLibraryAndPrintError("libGLESv2.so");
49       if (!gles_library)
50         return false;
51       base::NativeLibrary egl_library = LoadLibraryAndPrintError("libEGL.so");
52       if (!egl_library) {
53         base::UnloadNativeLibrary(gles_library);
54         return false;
55       }
56 
57       GLGetProcAddressProc get_proc_address =
58           reinterpret_cast<GLGetProcAddressProc>(
59               base::GetFunctionPointerFromNativeLibrary(
60                   egl_library, "eglGetProcAddress"));
61       if (!get_proc_address) {
62         LOG(ERROR) << "eglGetProcAddress not found.";
63         base::UnloadNativeLibrary(egl_library);
64         base::UnloadNativeLibrary(gles_library);
65         return false;
66       }
67 
68       SetGLGetProcAddressProc(get_proc_address);
69       AddGLNativeLibrary(egl_library);
70       AddGLNativeLibrary(gles_library);
71       SetGLImplementation(kGLImplementationEGLGLES2);
72 
73       InitializeStaticGLBindingsGL();
74       InitializeStaticGLBindingsEGL();
75 
76       // These two functions take single precision float rather than double
77       // precision float parameters in GLES.
78       ::gfx::g_driver_gl.fn.glClearDepthFn = MarshalClearDepthToClearDepthf;
79       ::gfx::g_driver_gl.fn.glDepthRangeFn = MarshalDepthRangeToDepthRangef;
80       break;
81     }
82     case kGLImplementationOSMesaGL:
83       InitializeStaticGLBindingsOSMesaGL();
84       break;
85     case kGLImplementationMockGL: {
86       SetGLImplementation(kGLImplementationMockGL);
87       InitializeStaticGLBindingsGL();
88       break;
89     }
90     default:
91       NOTIMPLEMENTED() << "InitializeStaticGLBindings on Android";
92       return false;
93   }
94 
95   return true;
96 }
97 
InitializeDynamicGLBindings(GLImplementation implementation,GLContext * context)98 bool InitializeDynamicGLBindings(GLImplementation implementation,
99                                  GLContext* context) {
100   switch (implementation) {
101     case kGLImplementationEGLGLES2:
102       InitializeDynamicGLBindingsGL(context);
103       InitializeDynamicGLBindingsEGL(context);
104       break;
105     case kGLImplementationOSMesaGL:
106       InitializeDynamicGLBindingsGL(context);
107       InitializeDynamicGLBindingsOSMESA(context);
108       break;
109     case kGLImplementationMockGL:
110       if (!context) {
111         scoped_refptr<GLContextStubWithExtensions> mock_context(
112             new GLContextStubWithExtensions());
113         mock_context->SetGLVersionString("opengl es 3.0");
114         InitializeDynamicGLBindingsGL(mock_context.get());
115       } else
116         InitializeDynamicGLBindingsGL(context);
117       break;
118     default:
119       NOTREACHED() << "InitializeDynamicGLBindings on Android";
120       return false;
121   }
122 
123   return true;
124 }
125 
InitializeDebugGLBindings()126 void InitializeDebugGLBindings() {
127   InitializeDebugGLBindingsEGL();
128   InitializeDebugGLBindingsGL();
129   InitializeDebugGLBindingsOSMESA();
130 }
131 
ClearGLBindings()132 void ClearGLBindings() {
133   ClearGLBindingsEGL();
134   ClearGLBindingsGL();
135   ClearGLBindingsOSMESA();
136   SetGLImplementation(kGLImplementationNone);
137 
138   UnloadGLNativeLibraries();
139 }
140 
GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo * info)141 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
142   switch (GetGLImplementation()) {
143     case kGLImplementationEGLGLES2:
144       return GetGLWindowSystemBindingInfoEGL(info);
145     default:
146       return false;
147   }
148   return false;
149 }
150 
151 }  // namespace gfx
152