xref: /dragonfly/sys/dev/misc/syscons/rain/rain_saver.c (revision f6e8a0a1)
1 /*-
2  * Copyright (c) 1998 Dag-Erling Coïdan Smørgrav
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: src/sys/modules/syscons/rain/rain_saver.c,v 1.5.2.1 2000/05/10 16:26:47 obrien Exp $
29  * $DragonFly: src/sys/dev/misc/syscons/rain/rain_saver.c,v 1.7 2006/09/03 18:52:28 dillon Exp $
30  */
31 
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/module.h>
36 #include <sys/syslog.h>
37 #include <sys/consio.h>
38 #include <sys/fbio.h>
39 #include <sys/random.h>
40 #include <sys/thread.h>
41 #include <sys/thread2.h>
42 
43 #include <dev/video/fb/fbreg.h>
44 #include <dev/video/fb/splashreg.h>
45 #include "../syscons.h"
46 
47 static u_char *vid;
48 
49 #define SCRW 320
50 #define SCRH 200
51 #define RAINMAX 63
52 
53 static u_char rain_pal[768];
54 static int blanked;
55 
56 static void
rain_update(video_adapter_t * adp)57 rain_update(video_adapter_t *adp)
58 {
59     int i, t;
60 
61     t = rain_pal[(RAINMAX*3+2)];
62     for (i = (RAINMAX*3+2); i > 5; i -= 3)
63 	rain_pal[i] = rain_pal[i-3];
64     rain_pal[5] = t;
65     load_palette(adp, rain_pal);
66 }
67 
68 static int
rain_saver(video_adapter_t * adp,int blank)69 rain_saver(video_adapter_t *adp, int blank)
70 {
71     int i, j, k;
72 
73     if (blank) {
74 	/* switch to graphics mode */
75 	if (blanked <= 0) {
76 	    crit_enter();
77 	    set_video_mode(adp, M_VGA_CG320);
78 	    load_palette(adp, rain_pal);
79 #if 0 /* XXX conflict */
80 	    set_border(adp, 0);
81 #endif
82 	    blanked++;
83 	    vid = (u_char *)adp->va_window;
84 	    crit_exit();
85 	    bzero(vid, SCRW*SCRH);
86 	    for (i = 0; i < SCRW; i += 2)
87 		vid[i] = 1 + (krandom() % RAINMAX);
88 	    for (j = 1, k = SCRW; j < SCRH; j++)
89 		for (i = 0; i < SCRW; i += 2, k += 2)
90 		    vid[k] = (vid[k-SCRW] < RAINMAX) ? 1 + vid[k-SCRW] : 1;
91 	}
92 
93 	/* update display */
94 	rain_update(adp);
95 
96     } else {
97 	blanked = 0;
98     }
99     return 0;
100 }
101 
102 static int
rain_init(video_adapter_t * adp)103 rain_init(video_adapter_t *adp)
104 {
105     video_info_t info;
106     int i;
107 
108     /* check that the console is capable of running in 320x200x256 */
109     if (get_mode_info(adp, M_VGA_CG320, &info)) {
110         log(LOG_NOTICE, "rain_saver: the console does not support M_VGA_CG320\n");
111 	return ENODEV;
112     }
113 
114     /* intialize the palette */
115     for (i = 3; i < (RAINMAX+1)*3; i += 3)
116 	rain_pal[i+2] = rain_pal[i-1] + 4;
117 
118     blanked = 0;
119 
120     return 0;
121 }
122 
123 static int
rain_term(video_adapter_t * adp)124 rain_term(video_adapter_t *adp)
125 {
126     return 0;
127 }
128 
129 static scrn_saver_t rain_module = {
130     "rain_saver", rain_init, rain_term, rain_saver, NULL,
131 };
132 
133 SAVER_MODULE(rain_saver, rain_module);
134