rain_saver.c revision 110235 
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 110235 2003-02-02 13:52:25Z alfred $
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#ifdef MAX
45#undef MAX
46#endif
47#define MAX		 63	/* number of colors (in addition to black) */
48#define INCREMENT	 4	/* increment between colors */
49
50#define RED(n)		 ((n) * 3 + 0)
51#define GREEN(n)	 ((n) * 3 + 1)
52#define BLUE(n)		 ((n) * 3 + 2)
53
54static u_char		*vid;
55static int		 banksize, scrmode, bpsl, scrw, scrh;
56static u_char		 rain_pal[768];
57static int		 blanked;
58
59static void
60rain_update(video_adapter_t *adp)
61{
62	int i, t;
63
64	t = rain_pal[BLUE(MAX)];
65	for (i = MAX; i > 1; i--)
66		rain_pal[BLUE(i)] = rain_pal[BLUE(i - 1)];
67	rain_pal[BLUE(1)] = t;
68	load_palette(adp, rain_pal);
69}
70
71static int
72rain_saver(video_adapter_t *adp, int blank)
73{
74	int i, j, o, p, pl;
75	u_char temp;
76
77	if (blank) {
78		/* switch to graphics mode */
79		if (blanked <= 0) {
80			pl = splhigh();
81			set_video_mode(adp, scrmode);
82			load_palette(adp, rain_pal);
83			set_border(adp, 0);
84			blanked++;
85			vid = (u_char *)adp->va_window;
86			banksize = adp->va_window_size;
87			bpsl = adp->va_line_width;
88			splx(pl);
89			for (i = 0; i < bpsl*scrh; i += banksize) {
90				set_origin(adp, i);
91				if ((bpsl * scrh - i) < banksize)
92					bzero(vid, bpsl * scrh - i);
93				else
94					bzero(vid, banksize);
95			}
96			set_origin(adp, 0);
97			for (i = 0, o = 0, p = 0; i < scrw; i += 2, p += 2) {
98				if (p > banksize) {
99					p -= banksize;
100					o += banksize;
101					set_origin(adp, o);
102				}
103				vid[p] = 1 + (random() % MAX);
104			}
105			o = 0; p = 0;
106			for (j = 1; j < scrh; j++)
107			  for (i = 0, p = bpsl * (j - 1) - o; i < scrw; i += 2, p+= 2) {
108			  	while (p > banksize) {
109					p -= banksize;
110					o += banksize;
111				}
112				set_origin(adp, o);
113				temp = (vid[p] < MAX) ? 1 + vid[p] : 1;
114				if (p + bpsl < banksize) {
115					vid[p + bpsl] = temp;
116				} else {
117					set_origin(adp, o + banksize);
118					vid[p + bpsl - banksize] = temp;
119				}
120			  }
121		}
122
123		/* update display */
124		rain_update(adp);
125	} else {
126		blanked = 0;
127	}
128	return (0);
129}
130
131static int
132rain_init(video_adapter_t *adp)
133{
134	video_info_t info;
135	int i;
136
137	if (!get_mode_info(adp, M_VGA_CG320, &info)) {
138		scrmode = M_VGA_CG320;
139	} else if (!get_mode_info(adp, M_PC98_PEGC640x480, &info)) {
140		scrmode = M_PC98_PEGC640x480;
141	} else if (!get_mode_info(adp, M_PC98_PEGC640x400, &info)) {
142		scrmode = M_PC98_PEGC640x400;
143	} else {
144		log(LOG_NOTICE,
145		    "%s: the console does not support M_VGA_CG320\n",
146		    SAVER_NAME);
147		return (ENODEV);
148	}
149
150	scrw = info.vi_width;
151	scrh = info.vi_height;
152
153	/* intialize the palette */
154	for (i = 1; i < MAX; i++)
155		rain_pal[BLUE(i)] = rain_pal[BLUE(i - 1)] + INCREMENT;
156
157	return (0);
158}
159
160static int
161rain_term(video_adapter_t *adp)
162{
163	return (0);
164}
165
166static scrn_saver_t rain_module = {
167	SAVER_NAME,
168	rain_init,
169	rain_term,
170	rain_saver,
171	NULL
172};
173
174SAVER_MODULE(rain_saver, rain_module);
175