1 /*
2 * Copyright © 2009, 2013 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <X11/Xlib.h>
27 #include "glx_common.h"
28
29 Display *
get_display_or_skip(void)30 get_display_or_skip(void)
31 {
32 Display *dpy = XOpenDisplay(NULL);
33
34 if (!dpy) {
35 fputs("couldn't open display\n", stderr);
36 exit(77);
37 }
38
39 return dpy;
40 }
41
42 XVisualInfo *
get_glx_visual(Display * dpy)43 get_glx_visual(Display *dpy)
44 {
45 XVisualInfo *visinfo;
46 int attrib[] = {
47 GLX_RGBA,
48 GLX_RED_SIZE, 1,
49 GLX_GREEN_SIZE, 1,
50 GLX_BLUE_SIZE, 1,
51 GLX_DOUBLEBUFFER,
52 None
53 };
54 int screen = DefaultScreen(dpy);
55
56 visinfo = glXChooseVisual(dpy, screen, attrib);
57 if (visinfo == NULL) {
58 fputs("Couldn't get an RGBA, double-buffered visual\n", stderr);
59 exit(1);
60 }
61
62 return visinfo;
63 }
64
65 Window
get_glx_window(Display * dpy,XVisualInfo * visinfo,bool map)66 get_glx_window(Display *dpy, XVisualInfo *visinfo, bool map)
67 {
68 XSetWindowAttributes window_attr;
69 unsigned long mask;
70 int screen = DefaultScreen(dpy);
71 Window root_win = RootWindow(dpy, screen);
72 Window win;
73
74 window_attr.background_pixel = 0;
75 window_attr.border_pixel = 0;
76 window_attr.colormap = XCreateColormap(dpy, root_win,
77 visinfo->visual, AllocNone);
78 window_attr.event_mask = StructureNotifyMask | ExposureMask |
79 KeyPressMask;
80 mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
81 win = XCreateWindow(dpy, root_win, 0, 0,
82 10, 10, /* width, height */
83 0, visinfo->depth, InputOutput,
84 visinfo->visual, mask, &window_attr);
85
86 return win;
87 }
88
89 void
make_glx_context_current_or_skip(Display * dpy)90 make_glx_context_current_or_skip(Display *dpy)
91 {
92 GLXContext ctx;
93 XVisualInfo *visinfo = get_glx_visual(dpy);
94 Window win = get_glx_window(dpy, visinfo, false);
95
96 ctx = glXCreateContext(dpy, visinfo, False, True);
97 if (ctx == None) {
98 fputs("glXCreateContext failed\n", stderr);
99 exit(1);
100 }
101
102 glXMakeCurrent(dpy, win, ctx);
103 }
104
105 GLXFBConfig
get_fbconfig_for_visinfo(Display * dpy,XVisualInfo * visinfo)106 get_fbconfig_for_visinfo(Display *dpy, XVisualInfo *visinfo)
107 {
108 int i, nconfigs;
109 GLXFBConfig ret = None, *configs;
110
111 configs = glXGetFBConfigs(dpy, visinfo->screen, &nconfigs);
112 if (!configs)
113 return None;
114
115 for (i = 0; i < nconfigs; i++) {
116 int v;
117
118 if (glXGetFBConfigAttrib(dpy, configs[i], GLX_VISUAL_ID, &v))
119 continue;
120
121 if (v == visinfo->visualid) {
122 ret = configs[i];
123 break;
124 }
125 }
126
127 XFree(configs);
128 return ret;
129 }
130