rain_saver.c revision 86122 
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 86122 2001-11-06 03:28:21Z 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	/* number of colors (in addition to black) */
47#define INCREMENT	 4	/* increment between colors */
48
49#define RED(n)		 ((n) * 3 + 0)
50#define GREEN(n)	 ((n) * 3 + 1)
51#define BLUE(n)		 ((n) * 3 + 2)
52
53static u_char		*vid;
54static u_char		 rain_pal[768];
55static int		 blanked;
56
57static void
58rain_update(video_adapter_t *adp)
59{
60	int i, t;
61
62	t = rain_pal[BLUE(MAX)];
63	for (i = MAX; i > 1; i--)
64		rain_pal[BLUE(i)] = rain_pal[BLUE(i - 1)];
65	rain_pal[BLUE(1)] = t;
66	load_palette(adp, rain_pal);
67}
68
69static int
70rain_saver(video_adapter_t *adp, int blank)
71{
72	int i, j, k, pl;
73
74	if (blank) {
75		/* switch to graphics mode */
76		if (blanked <= 0) {
77			pl = splhigh();
78			set_video_mode(adp, M_VGA_CG320);
79			load_palette(adp, rain_pal);
80			set_border(adp, 0);
81			blanked++;
82			vid = (u_char *)adp->va_window;
83			splx(pl);
84			bzero(vid, SCRW * SCRH);
85			for (i = 0; i < SCRW; i += 2)
86				vid[i] = 1 + (random() % MAX);
87			for (j = 1, k = SCRW; j < SCRH; j++)
88				for (i = 0; i < SCRW; i += 2, k += 2)
89					vid[k] = (vid[k - SCRW] < MAX) ?
90					    1 + vid[k - SCRW] : 1;
91		}
92
93		/* update display */
94		rain_update(adp);
95	} else {
96		blanked = 0;
97	}
98	return (0);
99}
100
101static int
102rain_init(video_adapter_t *adp)
103{
104	video_info_t info;
105	int i;
106
107	/* check that the console is capable of running in 320x200x256 */
108	if (get_mode_info(adp, M_VGA_CG320, &info)) {
109		log(LOG_NOTICE,
110		    "%s: the console does not support M_VGA_CG320\n",
111		    SAVER_NAME);
112		return (ENODEV);
113	}
114
115	/* intialize the palette */
116	for (i = 1; i < MAX; i++)
117		rain_pal[BLUE(i)] = rain_pal[BLUE(i - 1)] + INCREMENT;
118
119	return (0);
120}
121
122static int
123rain_term(video_adapter_t *adp)
124{
125	return (0);
126}
127
128static scrn_saver_t rain_module = {
129	SAVER_NAME,
130	rain_init,
131	rain_term,
132	rain_saver,
133	NULL
134};
135
136SAVER_MODULE(rain_saver, rain_module);
137