warp_saver.c revision 50477 
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 50477 1999-08-28 01:08:13Z peter $
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 <machine/random.h>
40
41#include <dev/fb/fbreg.h>
42#include <dev/fb/splashreg.h>
43#include <dev/syscons/syscons.h>
44
45static u_char *vid;
46static int blanked;
47
48#define SCRW 320
49#define SCRH 200
50#define SPP 15
51#define STARS (SPP*(1+2+4+8))
52
53static int star[STARS];
54static u_char warp_pal[768] = {
55    0x00, 0x00, 0x00,
56    0x66, 0x66, 0x66,
57    0x99, 0x99, 0x99,
58    0xcc, 0xcc, 0xcc,
59    0xff, 0xff, 0xff
60    /* the rest is zero-filled by the compiler */
61};
62
63static void
64warp_update(void)
65{
66    int i, j, k, n;
67
68    for (i = 1, k = 0, n = SPP*8; i < 5; i++, n /= 2)
69	for (j = 0; j < n; j++, k++) {
70	    vid[star[k]] = 0;
71	    star[k] += i;
72	    if (star[k] > SCRW*SCRH)
73		star[k] -= SCRW*SCRH;
74	    vid[star[k]] = i;
75	}
76}
77
78static int
79warp_saver(video_adapter_t *adp, int blank)
80{
81    int pl;
82
83    if (blank) {
84	/* switch to graphics mode */
85	if (blanked <= 0) {
86	    pl = splhigh();
87	    set_video_mode(adp, M_VGA_CG320);
88	    load_palette(adp, warp_pal);
89#if 0 /* XXX conflict */
90	    set_border(adp, 0);
91#endif
92	    blanked++;
93	    vid = (u_char *)adp->va_window;
94	    splx(pl);
95	    bzero(vid, SCRW*SCRH);
96	}
97
98	/* update display */
99	warp_update();
100
101    } else {
102	blanked = 0;
103    }
104    return 0;
105}
106
107static int
108warp_init(video_adapter_t *adp)
109{
110    video_info_t info;
111    int i;
112
113    /* check that the console is capable of running in 320x200x256 */
114    if (get_mode_info(adp, M_VGA_CG320, &info)) {
115        log(LOG_NOTICE, "warp_saver: the console does not support M_VGA_CG320\n");
116	return ENODEV;
117    }
118
119    /* randomize the star field */
120    for (i = 0; i < STARS; i++) {
121	star[i] = random() % (SCRW*SCRH);
122    }
123
124    blanked = 0;
125
126    return 0;
127}
128
129static int
130warp_term(video_adapter_t *adp)
131{
132    return 0;
133}
134
135static scrn_saver_t warp_module = {
136    "warp_saver", warp_init, warp_term, warp_saver, NULL,
137};
138
139SAVER_MODULE(warp_saver, warp_module);
140