1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gl/gl_context_osmesa.h"
#include <GL/osmesa.h>
#include "base/logging.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_surface.h"
namespace gfx {
GLContextOSMesa::GLContextOSMesa(GLShareGroup* share_group)
: GLContextReal(share_group),
context_(NULL) {
}
bool GLContextOSMesa::Initialize(GLSurface* compatible_surface,
GpuPreference gpu_preference) {
DCHECK(!context_);
OSMesaContext share_handle = static_cast<OSMesaContext>(
share_group() ? share_group()->GetHandle() : NULL);
GLuint format = compatible_surface->GetFormat();
DCHECK_NE(format, (unsigned)0);
context_ = OSMesaCreateContextExt(format,
0, // depth bits
0, // stencil bits
0, // accum bits
share_handle);
if (!context_) {
LOG(ERROR) << "OSMesaCreateContextExt failed.";
return false;
}
return true;
}
void GLContextOSMesa::Destroy() {
if (context_) {
OSMesaDestroyContext(static_cast<OSMesaContext>(context_));
context_ = NULL;
}
}
bool GLContextOSMesa::MakeCurrent(GLSurface* surface) {
DCHECK(context_);
gfx::Size size = surface->GetSize();
ScopedReleaseCurrent release_current;
if (!OSMesaMakeCurrent(context_,
surface->GetHandle(),
GL_UNSIGNED_BYTE,
size.width(),
size.height())) {
LOG(ERROR) << "OSMesaMakeCurrent failed.";
Destroy();
return false;
}
// Set this as soon as the context is current, since we might call into GL.
SetRealGLApi();
// Row 0 is at the top.
OSMesaPixelStore(OSMESA_Y_UP, 0);
SetCurrent(surface);
if (!InitializeDynamicBindings()) {
return false;
}
if (!surface->OnMakeCurrent(this)) {
LOG(ERROR) << "Could not make current.";
return false;
}
release_current.Cancel();
return true;
}
void GLContextOSMesa::ReleaseCurrent(GLSurface* surface) {
if (!IsCurrent(surface))
return;
SetCurrent(NULL);
// TODO: Calling with NULL here does not work to release the context.
OSMesaMakeCurrent(NULL, NULL, GL_UNSIGNED_BYTE, 0, 0);
}
bool GLContextOSMesa::IsCurrent(GLSurface* surface) {
DCHECK(context_);
bool native_context_is_current =
context_ == OSMesaGetCurrentContext();
// If our context is current then our notion of which GLContext is
// current must be correct. On the other hand, third-party code
// using OpenGL might change the current context.
DCHECK(!native_context_is_current || (GetRealCurrent() == this));
if (!native_context_is_current)
return false;
if (surface) {
GLint width;
GLint height;
GLint format;
void* buffer = NULL;
OSMesaGetColorBuffer(context_, &width, &height, &format, &buffer);
if (buffer != surface->GetHandle())
return false;
}
return true;
}
void* GLContextOSMesa::GetHandle() {
return context_;
}
void GLContextOSMesa::OnSetSwapInterval(int interval) {
DCHECK(IsCurrent(NULL));
}
GLContextOSMesa::~GLContextOSMesa() {
Destroy();
}
} // namespace gfx
|
