star_saver.c revision 27427 
1/*-
2 * Copyright (c) 1995 S�ren Schmidt
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 withough 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: star_saver.c,v 1.11 1997/04/06 11:07:01 dufault Exp $
29 */
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/exec.h>
34#include <sys/sysent.h>
35#include <sys/lkm.h>
36
37#include <machine/md_var.h>
38#include <i386/include/pc/display.h>
39
40#include <saver.h>
41
42MOD_MISC(star_saver);
43
44#define NUM_STARS	50
45
46/*
47 * Alternate saver that got its inspiration from a well known utility
48 * package for an inferior^H^H^H^H^H^Hfamous OS.
49 */
50static void
51star_saver(int blank)
52{
53	scr_stat	*scp = cur_console;
54	int		cell, i;
55	char 		pattern[] = {"...........++++***   "};
56	char		colors[] = {FG_DARKGREY, FG_LIGHTGREY,
57				    FG_WHITE, FG_LIGHTCYAN};
58	static u_short 	stars[NUM_STARS][2];
59
60	if (blank) {
61		if (scrn_blanked <= 0) {
62			scrn_blanked = 1;
63			fillw((FG_LIGHTGREY|BG_BLACK)<<8|scr_map[0x20], Crtat,
64			      scp->xsize * scp->ysize);
65			set_border(0);
66			for(i=0; i<NUM_STARS; i++) {
67				stars[i][0] =
68					random() % (scp->xsize*scp->ysize);
69				stars[i][1] = 0;
70			}
71		}
72		cell = random() % NUM_STARS;
73		*((u_short*)(Crtat + stars[cell][0])) =
74			scr_map[pattern[stars[cell][1]]] |
75				colors[random()%sizeof(colors)] << 8;
76		if ((stars[cell][1]+=(random()%4)) >= sizeof(pattern)-1) {
77			stars[cell][0] = random() % (scp->xsize*scp->ysize);
78			stars[cell][1] = 0;
79		}
80	}
81	else {
82		if (scrn_blanked > 0) {
83			set_border(scp->border);
84			scrn_blanked = 0;
85		}
86	}
87}
88
89static int
90star_saver_load(struct lkm_table *lkmtp, int cmd)
91{
92	return add_scrn_saver(star_saver);
93}
94
95static int
96star_saver_unload(struct lkm_table *lkmtp, int cmd)
97{
98	return remove_scrn_saver(star_saver);
99}
100
101int
102star_saver_mod(struct lkm_table *lkmtp, int cmd, int ver)
103{
104	MOD_DISPATCH(star_saver, lkmtp, cmd, ver,
105		star_saver_load, star_saver_unload, lkm_nullcmd);
106}
107