xref: /freebsd/sys/dev/syscons/rain/rain_saver.c (revision 41466b50c1d5bfd1cf6adaae547a579a75d7c04e)
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  * $FreeBSD$
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 static u_char *vid;
44 
45 #define SCRW 320
46 #define SCRH 200
47 #define MAX 63
48 
49 static u_char rain_pal[768];
50 static int blanked;
51 
52 static void
53 rain_update(video_adapter_t *adp)
54 {
55     int i, t;
56 
57     t = rain_pal[(MAX*3+2)];
58     for (i = (MAX*3+2); i > 5; i -= 3)
59 	rain_pal[i] = rain_pal[i-3];
60     rain_pal[5] = t;
61     load_palette(adp, rain_pal);
62 }
63 
64 static int
65 rain_saver(video_adapter_t *adp, int blank)
66 {
67     int i, j, k, pl;
68 
69     if (blank) {
70 	/* switch to graphics mode */
71 	if (blanked <= 0) {
72 	    pl = splhigh();
73 	    set_video_mode(adp, M_VGA_CG320);
74 	    load_palette(adp, rain_pal);
75 #if 0 /* XXX conflict */
76 	    set_border(adp, 0);
77 #endif
78 	    blanked++;
79 	    vid = (u_char *)adp->va_window;
80 	    splx(pl);
81 	    bzero(vid, SCRW*SCRH);
82 	    for (i = 0; i < SCRW; i += 2)
83 		vid[i] = 1 + (random() % MAX);
84 	    for (j = 1, k = SCRW; j < SCRH; j++)
85 		for (i = 0; i < SCRW; i += 2, k += 2)
86 		    vid[k] = (vid[k-SCRW] < MAX) ? 1 + vid[k-SCRW] : 1;
87 	}
88 
89 	/* update display */
90 	rain_update(adp);
91 
92     } else {
93 	blanked = 0;
94     }
95     return 0;
96 }
97 
98 static int
99 rain_init(video_adapter_t *adp)
100 {
101     video_info_t info;
102     int i;
103 
104     /* check that the console is capable of running in 320x200x256 */
105     if (get_mode_info(adp, M_VGA_CG320, &info)) {
106         log(LOG_NOTICE, "rain_saver: the console does not support M_VGA_CG320\n");
107 	return ENODEV;
108     }
109 
110     /* intialize the palette */
111     for (i = 3; i < (MAX+1)*3; i += 3)
112 	rain_pal[i+2] = rain_pal[i-1] + 4;
113 
114     blanked = 0;
115 
116     return 0;
117 }
118 
119 static int
120 rain_term(video_adapter_t *adp)
121 {
122     return 0;
123 }
124 
125 static scrn_saver_t rain_module = {
126     "rain_saver", rain_init, rain_term, rain_saver, NULL,
127 };
128 
129 SAVER_MODULE(rain_saver, rain_module);
130