rain_saver.c revision 45616 
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 *	$Id: rain_saver.c,v 1.2 1999/01/11 03:18:50 yokota Exp $
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
37#include <machine/random.h>
38
39#include <saver.h>
40
41static u_char *vid;
42
43#define SCRW 320
44#define SCRH 200
45#define MAX 63
46
47static u_char rain_pal[768];
48static int blanked;
49
50static void
51rain_update(video_adapter_t *adp)
52{
53    int i, t;
54
55    t = rain_pal[(MAX*3+2)];
56    for (i = (MAX*3+2); i > 5; i -= 3)
57	rain_pal[i] = rain_pal[i-3];
58    rain_pal[5] = t;
59    load_palette(adp, rain_pal);
60}
61
62static int
63rain_saver(video_adapter_t *adp, int blank)
64{
65    int i, j, k, pl;
66
67    if (blank) {
68	/* switch to graphics mode */
69	if (blanked <= 0) {
70	    pl = splhigh();
71	    set_video_mode(adp, M_VGA_CG320);
72	    load_palette(adp, rain_pal);
73#if 0 /* XXX conflict */
74	    set_border(adp, 0);
75#endif
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
90    } else {
91	blanked = 0;
92    }
93    return 0;
94}
95
96static int
97rain_init(video_adapter_t *adp)
98{
99    video_info_t info;
100    int i;
101
102    /* check that the console is capable of running in 320x200x256 */
103    if (get_mode_info(adp, M_VGA_CG320, &info)) {
104        log(LOG_NOTICE, "rain_saver: the console does not support M_VGA_CG320\n");
105	return ENODEV;
106    }
107
108    /* intialize the palette */
109    for (i = 3; i < (MAX+1)*3; i += 3)
110	rain_pal[i+2] = rain_pal[i-1] + 4;
111
112    blanked = 0;
113
114    return 0;
115}
116
117static int
118rain_term(video_adapter_t *adp)
119{
120    return 0;
121}
122
123static scrn_saver_t rain_module = {
124    "rain_saver", rain_init, rain_term, rain_saver, NULL,
125};
126
127SAVER_MODULE(rain_saver, rain_module);
128