warp_saver.c revision 86121 
1/*-
2 * Copyright (c) 1998 Dag-Erling Co�dan Sm�rgrav
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD: head/sys/dev/syscons/warp/warp_saver.c 86121 2001-11-06 02:40:09Z des $
29 */
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/kernel.h>
34#include <sys/module.h>
35#include <sys/syslog.h>
36#include <sys/consio.h>
37#include <sys/fbio.h>
38
39#include <dev/fb/fbreg.h>
40#include <dev/fb/splashreg.h>
41#include <dev/syscons/syscons.h>
42
43#define SAVER_NAME	 "warp_saver"
44#define SCRW		 320
45#define SCRH		 200
46#define SPP		 15
47#define STARS		 (SPP * (1 + 2 + 4 + 8))
48
49static u_char		*vid;
50static int		 blanked;
51static int		 star[STARS];
52static u_char		 warp_pal[768] = {
53	0x00, 0x00, 0x00,
54	0x66, 0x66, 0x66,
55	0x99, 0x99, 0x99,
56	0xcc, 0xcc, 0xcc,
57	0xff, 0xff, 0xff
58	/* the rest is zero-filled by the compiler */
59};
60
61static void
62warp_update(void)
63{
64	int i, j, k, n;
65
66	for (i = 1, k = 0, n = SPP*8; i < 5; i++, n /= 2) {
67		for (j = 0; j < n; j++, k++) {
68			vid[star[k]] = 0;
69			star[k] += i;
70			if (star[k] > SCRW * SCRH)
71				star[k] -= SCRW * SCRH;
72			vid[star[k]] = i;
73		}
74	}
75}
76
77static int
78warp_saver(video_adapter_t *adp, int blank)
79{
80	int pl;
81
82	if (blank) {
83		/* switch to graphics mode */
84		if (blanked <= 0) {
85			pl = splhigh();
86			set_video_mode(adp, M_VGA_CG320);
87			load_palette(adp, warp_pal);
88			set_border(adp, 0);
89			blanked++;
90			vid = (u_char *)adp->va_window;
91			splx(pl);
92			bzero(vid, SCRW * SCRH);
93		}
94
95		/* update display */
96		warp_update();
97	} else {
98		blanked = 0;
99	}
100	return (0);
101}
102
103static int
104warp_init(video_adapter_t *adp)
105{
106	video_info_t info;
107	int i;
108
109	/* check that the console is capable of running in 320x200x256 */
110	if (get_mode_info(adp, M_VGA_CG320, &info)) {
111		log(LOG_NOTICE,
112		    "%s: the console does not support M_VGA_CG320\n",
113		    SAVER_NAME);
114		return (ENODEV);
115	}
116
117	/* randomize the star field */
118	for (i = 0; i < STARS; i++)
119		star[i] = random() % (SCRW * SCRH);
120
121	return (0);
122}
123
124static int
125warp_term(video_adapter_t *adp)
126{
127	return (0);
128}
129
130static scrn_saver_t warp_module = {
131	SAVER_NAME,
132	warp_init,
133	warp_term,
134	warp_saver,
135	NULL
136};
137
138SAVER_MODULE(warp_saver, warp_module);
139