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
));
60 mtx_unlock(&_eglModuleMutex
);
63 _eglInitDriver(_eglDriver
);
66 mtx_unlock(&_eglModuleMutex
);
72 _eglMatchAndInitialize(_EGLDisplay
*disp
)
75 if (_eglDriver
->API
.Initialize(_eglDriver
, disp
))
82 * Match a display to a driver. The matching is done by finding the first
83 * driver that can initialize the display.
86 _eglMatchDriver(_EGLDisplay
*disp
)
90 assert(!disp
->Initialized
);
93 disp
->Options
.ForceSoftware
=
94 env_var_as_boolean("LIBGL_ALWAYS_SOFTWARE", false);
95 if (disp
->Options
.ForceSoftware
)
96 _eglLog(_EGL_DEBUG
, "Found 'LIBGL_ALWAYS_SOFTWARE' set, will use a CPU renderer");
98 best_drv
= _eglMatchAndInitialize(disp
);
99 if (!best_drv
&& !disp
->Options
.ForceSoftware
) {
100 disp
->Options
.ForceSoftware
= EGL_TRUE
;
101 best_drv
= _eglMatchAndInitialize(disp
);
105 disp
->Driver
= best_drv
;
106 disp
->Initialized
= EGL_TRUE
;
112 __eglMustCastToProperFunctionPointerType
113 _eglGetDriverProc(const char *procname
)
115 if (_eglGetDriver() && _eglDriver
->API
.GetProcAddress
)
116 return _eglDriver
->API
.GetProcAddress(_eglDriver
, procname
);
122 * Unload all drivers.
125 _eglUnloadDrivers(void)
127 /* this is called at atexit time */