rain_saver.c revision 86120 
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/rain/rain_saver.c 86120 2001-11-06 02:38:09Z 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	 "rain_saver"
44#define SCRW		 320
45#define SCRH		 200
46#define MAX		 63
47
48static u_char		*vid;
49static u_char		 rain_pal[768];
50static int		 blanked;
51
52static void
53rain_update(video_adapter_t *adp)
54{
55	int i, t;
56
57	t = rain_pal[(MAX*3+2)];
58	for (i = (MAX*3+2); i > 5; i -= 3)
59		rain_pal[i] = rain_pal[i-3];
60	rain_pal[5] = t;
61	load_palette(adp, rain_pal);
62}
63
64static int
65rain_saver(video_adapter_t *adp, int blank)
66{
67	int i, j, k, pl;
68
69	if (blank) {
70		/* switch to graphics mode */
71		if (blanked <= 0) {
72			pl = splhigh();
73			set_video_mode(adp, M_VGA_CG320);
74			load_palette(adp, rain_pal);
75			set_border(adp, 0);
76			blanked++;
77			vid = (u_char *)adp->va_window;
78			splx(pl);
79			bzero(vid, SCRW*SCRH);
80			for (i = 0; i < SCRW; i += 2)
81				vid[i] = 1 + (random() % MAX);
82			for (j = 1, k = SCRW; j < SCRH; j++)
83				for (i = 0; i < SCRW; i += 2, k += 2)
84					vid[k] = (vid[k-SCRW] < MAX) ? 1 + vid[k-SCRW] : 1;
85		}
86
87		/* update display */
88		rain_update(adp);
89	} else {
90		blanked = 0;
91	}
92	return (0);
93}
94
95static int
96rain_init(video_adapter_t *adp)
97{
98	video_info_t info;
99	int i;
100
101	/* check that the console is capable of running in 320x200x256 */
102	if (get_mode_info(adp, M_VGA_CG320, &info)) {
103		log(LOG_NOTICE,
104		    "%s: the console does not support M_VGA_CG320\n",
105		    SAVER_NAME);
106		return (ENODEV);
107	}
108
109	/* intialize the palette */
110	for (i = 3; i < (MAX+1)*3; i += 3)
111		rain_pal[i+2] = rain_pal[i-1] + 4;
112
113	return (0);
114}
115
116static int
117rain_term(video_adapter_t *adp)
118{
119	return (0);
120}
121
122static scrn_saver_t rain_module = {
123	SAVER_NAME,
124	rain_init,
125	rain_term,
126	rain_saver,
127	NULL
128};
129
130SAVER_MODULE(rain_saver, rain_module);
131