warp_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/warp/warp_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;
45static int blanked;
46
47#define SCRW 320
48#define SCRH 200
49#define SPP 15
50#define STARS (SPP*(1+2+4+8))
51
52static int star[STARS];
53static u_char warp_pal[768] = {
54    0x00, 0x00, 0x00,
55    0x66, 0x66, 0x66,
56    0x99, 0x99, 0x99,
57    0xcc, 0xcc, 0xcc,
58    0xff, 0xff, 0xff
59    /* the rest is zero-filled by the compiler */
60};
61
62static void
63warp_update(void)
64{
65    int i, j, k, n;
66
67    for (i = 1, k = 0, n = SPP*8; i < 5; i++, n /= 2)
68	for (j = 0; j < n; j++, k++) {
69	    vid[star[k]] = 0;
70	    star[k] += i;
71	    if (star[k] > SCRW*SCRH)
72		star[k] -= SCRW*SCRH;
73	    vid[star[k]] = i;
74	}
75}
76
77static int
78warp_saver(video_adapter_t *adp, int blank)
79{
80    int pl;
81
82    if (blank) {
83	/* switch to graphics mode */
84	if (blanked <= 0) {
85	    pl = splhigh();
86	    set_video_mode(adp, M_VGA_CG320);
87	    load_palette(adp, warp_pal);
88#if 0 /* XXX conflict */
89	    set_border(adp, 0);
90#endif
91	    blanked++;
92	    vid = (u_char *)adp->va_window;
93	    splx(pl);
94	    bzero(vid, SCRW*SCRH);
95	}
96
97	/* update display */
98	warp_update();
99
100    } else {
101	blanked = 0;
102    }
103    return 0;
104}
105
106static int
107warp_init(video_adapter_t *adp)
108{
109    video_info_t info;
110    int i;
111
112    /* check that the console is capable of running in 320x200x256 */
113    if (get_mode_info(adp, M_VGA_CG320, &info)) {
114        log(LOG_NOTICE, "warp_saver: the console does not support M_VGA_CG320\n");
115	return ENODEV;
116    }
117
118    /* randomize the star field */
119    for (i = 0; i < STARS; i++) {
120	star[i] = random() % (SCRW*SCRH);
121    }
122
123    blanked = 0;
124
125    return 0;
126}
127
128static int
129warp_term(video_adapter_t *adp)
130{
131    return 0;
132}
133
134static scrn_saver_t warp_module = {
135    "warp_saver", warp_init, warp_term, warp_saver, NULL,
136};
137
138SAVER_MODULE(warp_saver, warp_module);
139