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 extern const _EGLDriver _eglDriver
;
52 * Initialize the display using the driver's function.
53 * If the initialisation fails, try again using only software rendering.
56 _eglInitializeDisplay(_EGLDisplay
*disp
)
58 assert(!disp
->Initialized
);
61 disp
->Options
.ForceSoftware
=
62 env_var_as_boolean("LIBGL_ALWAYS_SOFTWARE", false);
63 if (disp
->Options
.ForceSoftware
)
64 _eglLog(_EGL_DEBUG
, "Found 'LIBGL_ALWAYS_SOFTWARE' set, will use a CPU renderer");
66 if (_eglDriver
.Initialize(disp
)) {
67 disp
->Driver
= &_eglDriver
;
68 disp
->Initialized
= EGL_TRUE
;
72 if (disp
->Options
.ForceSoftware
)
75 disp
->Options
.ForceSoftware
= EGL_TRUE
;
76 if (!_eglDriver
.Initialize(disp
))
79 disp
->Driver
= &_eglDriver
;
80 disp
->Initialized
= EGL_TRUE
;
84 __eglMustCastToProperFunctionPointerType
85 _eglGetDriverProc(const char *procname
)
87 if (_eglDriver
.GetProcAddress
)
88 return _eglDriver
.GetProcAddress(procname
);