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
29Display *
30get_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
42XVisualInfo *
43get_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
65Window
66get_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
89void
90make_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
105GLXFBConfig
106get_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