rain_saver.c revision 59617 
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 59617 2000-04-25 05:06:31Z bp $
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#include <sys/random.h>
39
40#include <dev/fb/fbreg.h>
41#include <dev/fb/splashreg.h>
42#include <dev/syscons/syscons.h>
43
44static u_char *vid;
45
46#define SCRW 320
47#define SCRH 200
48#define MAX 63
49
50static u_char rain_pal[768];
51static int blanked;
52
53static void
54rain_update(video_adapter_t *adp)
55{
56    int i, t;
57
58    t = rain_pal[(MAX*3+2)];
59    for (i = (MAX*3+2); i > 5; i -= 3)
60	rain_pal[i] = rain_pal[i-3];
61    rain_pal[5] = t;
62    load_palette(adp, rain_pal);
63}
64
65static int
66rain_saver(video_adapter_t *adp, int blank)
67{
68    int i, j, k, pl;
69
70    if (blank) {
71	/* switch to graphics mode */
72	if (blanked <= 0) {
73	    pl = splhigh();
74	    set_video_mode(adp, M_VGA_CG320);
75	    load_palette(adp, rain_pal);
76#if 0 /* XXX conflict */
77	    set_border(adp, 0);
78#endif
79	    blanked++;
80	    vid = (u_char *)adp->va_window;
81	    splx(pl);
82	    bzero(vid, SCRW*SCRH);
83	    for (i = 0; i < SCRW; i += 2)
84		vid[i] = 1 + (random() % MAX);
85	    for (j = 1, k = SCRW; j < SCRH; j++)
86		for (i = 0; i < SCRW; i += 2, k += 2)
87		    vid[k] = (vid[k-SCRW] < MAX) ? 1 + vid[k-SCRW] : 1;
88	}
89
90	/* update display */
91	rain_update(adp);
92
93    } else {
94	blanked = 0;
95    }
96    return 0;
97}
98
99static int
100rain_init(video_adapter_t *adp)
101{
102    video_info_t info;
103    int i;
104
105    /* check that the console is capable of running in 320x200x256 */
106    if (get_mode_info(adp, M_VGA_CG320, &info)) {
107        log(LOG_NOTICE, "rain_saver: the console does not support M_VGA_CG320\n");
108	return ENODEV;
109    }
110
111    /* intialize the palette */
112    for (i = 3; i < (MAX+1)*3; i += 3)
113	rain_pal[i+2] = rain_pal[i-1] + 4;
114
115    blanked = 0;
116
117    return 0;
118}
119
120static int
121rain_term(video_adapter_t *adp)
122{
123    return 0;
124}
125
126static scrn_saver_t rain_module = {
127    "rain_saver", rain_init, rain_term, rain_saver, NULL,
128};
129
130SAVER_MODULE(rain_saver, rain_module);
131