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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/bind.h"
6 #include "ui/gl/gl_bindings.h"
7 #include "ui/gl/gl_context_stub_with_extensions.h"
8 #include "ui/gl/gl_egl_api_implementation.h"
9 #include "ui/gl/gl_gl_api_implementation.h"
10 #include "ui/gl/gl_implementation.h"
11 #include "ui/gl/gl_implementation_osmesa.h"
12 #include "ui/gl/gl_osmesa_api_implementation.h"
13 #include "ui/ozone/ozone_platform.h"
14 #include "ui/ozone/public/surface_factory_ozone.h"
15 
16 namespace gfx {
17 
18 namespace {
19 
MarshalClearDepthToClearDepthf(GLclampd depth)20 void GL_BINDING_CALL MarshalClearDepthToClearDepthf(GLclampd depth) {
21   glClearDepthf(static_cast<GLclampf>(depth));
22 }
23 
MarshalDepthRangeToDepthRangef(GLclampd z_near,GLclampd z_far)24 void GL_BINDING_CALL MarshalDepthRangeToDepthRangef(GLclampd z_near,
25                                                     GLclampd z_far) {
26   glDepthRangef(static_cast<GLclampf>(z_near), static_cast<GLclampf>(z_far));
27 }
28 
29 }  // namespace
30 
GetAllowedGLImplementations(std::vector<GLImplementation> * impls)31 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
32   impls->push_back(kGLImplementationEGLGLES2);
33   impls->push_back(kGLImplementationOSMesaGL);
34 }
35 
InitializeStaticGLBindings(GLImplementation implementation)36 bool InitializeStaticGLBindings(GLImplementation implementation) {
37   // Prevent reinitialization with a different implementation. Once the gpu
38   // unit tests have initialized with kGLImplementationMock, we don't want to
39   // later switch to another GL implementation.
40   DCHECK_EQ(kGLImplementationNone, GetGLImplementation());
41 
42   switch (implementation) {
43     case kGLImplementationOSMesaGL:
44       return InitializeStaticGLBindingsOSMesaGL();
45     case kGLImplementationEGLGLES2:
46       ui::OzonePlatform::InitializeForGPU();
47       if (!ui::SurfaceFactoryOzone::GetInstance()->LoadEGLGLES2Bindings(
48               base::Bind(&AddGLNativeLibrary),
49               base::Bind(&SetGLGetProcAddressProc)))
50         return false;
51       SetGLImplementation(kGLImplementationEGLGLES2);
52       InitializeStaticGLBindingsGL();
53       InitializeStaticGLBindingsEGL();
54 
55       // These two functions take single precision float rather than double
56       // precision float parameters in GLES.
57       ::gfx::g_driver_gl.fn.glClearDepthFn = MarshalClearDepthToClearDepthf;
58       ::gfx::g_driver_gl.fn.glDepthRangeFn = MarshalDepthRangeToDepthRangef;
59       break;
60     case kGLImplementationMockGL: {
61       SetGLImplementation(kGLImplementationMockGL);
62       InitializeStaticGLBindingsGL();
63       break;
64     }
65     default:
66       NOTIMPLEMENTED()
67           << "Unsupported GL type for Ozone surface implementation";
68       return false;
69   }
70 
71   return true;
72 }
73 
InitializeDynamicGLBindings(GLImplementation implementation,GLContext * context)74 bool InitializeDynamicGLBindings(GLImplementation implementation,
75                                  GLContext* context) {
76   switch (implementation) {
77     case kGLImplementationOSMesaGL:
78       InitializeDynamicGLBindingsGL(context);
79       InitializeDynamicGLBindingsOSMESA(context);
80       break;
81     case kGLImplementationEGLGLES2:
82       InitializeDynamicGLBindingsGL(context);
83       InitializeDynamicGLBindingsEGL(context);
84       break;
85     case kGLImplementationMockGL:
86       if (!context) {
87         scoped_refptr<GLContextStubWithExtensions> mock_context(
88             new GLContextStubWithExtensions());
89         mock_context->SetGLVersionString("3.0");
90         InitializeDynamicGLBindingsGL(mock_context.get());
91       } else
92         InitializeDynamicGLBindingsGL(context);
93       break;
94     default:
95       return false;
96   }
97 
98   return true;
99 }
100 
InitializeDebugGLBindings()101 void InitializeDebugGLBindings() {
102 }
103 
ClearGLBindings()104 void ClearGLBindings() {
105   ClearGLBindingsEGL();
106   ClearGLBindingsGL();
107   SetGLImplementation(kGLImplementationNone);
108   UnloadGLNativeLibraries();
109 }
110 
GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo * info)111 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {
112   switch (GetGLImplementation()) {
113     case kGLImplementationEGLGLES2:
114       return GetGLWindowSystemBindingInfoEGL(info);
115     default:
116       return false;
117   }
118   return false;
119 }
120 
121 }  // namespace gfx
122