1 /**************************************************************************
3 * Copyright 2008 VMware, Inc.
4 * Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com>
5 * Copyright 2010-2011 LunarG, Inc.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the
10 * "Software"), to deal in the Software without restriction, including
11 * without limitation the rights to use, copy, modify, merge, publish,
12 * distribute, sub license, and/or sell copies of the Software, and to
13 * permit persons to whom the Software is furnished to do so, subject to
14 * the following conditions:
16 * The above copyright notice and this permission notice (including the
17 * next paragraph) shall be included in all copies or substantial portions
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
25 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 * DEALINGS IN THE SOFTWARE.
28 **************************************************************************/
32 * Functions for choosing and opening/loading device drivers.
40 #include "c11/threads.h"
42 #include "egldefines.h"
43 #include "egldisplay.h"
44 #include "egldriver.h"
47 #include "util/debug.h"
49 static mtx_t _eglModuleMutex
= _MTX_INITIALIZER_NP
;
50 static _EGLDriver
*_eglDriver
;
55 mtx_lock(&_eglModuleMutex
);
58 _eglDriver
= calloc(1, sizeof(*_eglDriver
));
61 _eglInitDriverFallbacks(_eglDriver
);
62 _eglInitDriver(_eglDriver
);
65 mtx_unlock(&_eglModuleMutex
);
71 _eglMatchAndInitialize(_EGLDisplay
*dpy
)
74 if (_eglDriver
->API
.Initialize(_eglDriver
, dpy
))
81 * Match a display to a driver. The matching is done by finding the first
82 * driver that can initialize the display.
85 _eglMatchDriver(_EGLDisplay
*dpy
)
89 assert(!dpy
->Initialized
);
92 dpy
->Options
.ForceSoftware
=
93 env_var_as_boolean("LIBGL_ALWAYS_SOFTWARE", false);
95 best_drv
= _eglMatchAndInitialize(dpy
);
96 if (!best_drv
&& !dpy
->Options
.ForceSoftware
) {
97 dpy
->Options
.ForceSoftware
= EGL_TRUE
;
98 best_drv
= _eglMatchAndInitialize(dpy
);
102 dpy
->Driver
= best_drv
;
103 dpy
->Initialized
= EGL_TRUE
;
109 __eglMustCastToProperFunctionPointerType
110 _eglGetDriverProc(const char *procname
)
113 return _eglDriver
->API
.GetProcAddress(_eglDriver
, procname
);
119 * Unload all drivers.
122 _eglUnloadDrivers(void)
124 /* this is called at atexit time */