0a4dae7588e4eabcca437d2282761073c1c31e21
[mesa.git] / src / egl / main / egldriver.c
1 /**************************************************************************
2 *
3 * Copyright 2008 VMware, Inc.
4 * Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com>
5 * Copyright 2010-2011 LunarG, Inc.
6 * All Rights Reserved.
7 *
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:
15 *
16 * The above copyright notice and this permission notice (including the
17 * next paragraph) shall be included in all copies or substantial portions
18 * of the Software.
19 *
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.
27 *
28 **************************************************************************/
29
30
31 /**
32 * Functions for choosing and opening/loading device drivers.
33 */
34
35
36 #include <assert.h>
37 #include <string.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include "c11/threads.h"
41
42 #include "egldefines.h"
43 #include "egldisplay.h"
44 #include "egldriver.h"
45 #include "egllog.h"
46
47 #include "util/debug.h"
48
49 extern _EGLDriver _eglDriver;
50
51 static _EGLDriver *
52 _eglMatchAndInitialize(_EGLDisplay *disp)
53 {
54 if (_eglDriver.Initialize(&_eglDriver, disp))
55 return &_eglDriver;
56
57 return NULL;
58 }
59
60 /**
61 * Match a display to a driver. The matching is done by finding the first
62 * driver that can initialize the display.
63 */
64 _EGLDriver *
65 _eglMatchDriver(_EGLDisplay *disp)
66 {
67 _EGLDriver *best_drv;
68
69 assert(!disp->Initialized);
70
71 /* set options */
72 disp->Options.ForceSoftware =
73 env_var_as_boolean("LIBGL_ALWAYS_SOFTWARE", false);
74 if (disp->Options.ForceSoftware)
75 _eglLog(_EGL_DEBUG, "Found 'LIBGL_ALWAYS_SOFTWARE' set, will use a CPU renderer");
76
77 best_drv = _eglMatchAndInitialize(disp);
78 if (!best_drv && !disp->Options.ForceSoftware) {
79 disp->Options.ForceSoftware = EGL_TRUE;
80 best_drv = _eglMatchAndInitialize(disp);
81 }
82
83 if (best_drv) {
84 disp->Driver = best_drv;
85 disp->Initialized = EGL_TRUE;
86 }
87
88 return best_drv;
89 }
90
91 __eglMustCastToProperFunctionPointerType
92 _eglGetDriverProc(const char *procname)
93 {
94 if (_eglDriver.GetProcAddress)
95 return _eglDriver.GetProcAddress(&_eglDriver, procname);
96
97 return NULL;
98 }