sys/dev/syscons/rain/rain_saver.c

   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  * $FreeBSD$
  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 #define SAVER_NAME       "rain_saver"
  44 #ifdef MAX
  45 #undef MAX
  46 #endif
  47 #define MAX              63     /* number of colors (in addition to black) */
  48 #define INCREMENT        4      /* increment between colors */
  49
  50 #define RED(n)           ((n) * 3 + 0)
  51 #define GREEN(n)         ((n) * 3 + 1)
  52 #define BLUE(n)          ((n) * 3 + 2)
  53
  54 #define SET_ORIGIN(adp, o) do {                         \
  55         int oo = o;                                     \
  56         if (oo != last_origin)                          \
  57             vidd_set_win_org(adp, last_origin = oo);    \
  58         } while (0)
  59
  60 static u_char           *vid;
  61 static int               banksize, scrmode, bpsl, scrw, scrh;
  62 static u_char            rain_pal[768];
  63 static int               blanked;
  64
  65 static void
  66 rain_update(video_adapter_t *adp)
  67 {
  68         int i, t;
  69
  70         t = rain_pal[BLUE(MAX)];
  71         for (i = MAX; i > 1; i--)
  72                 rain_pal[BLUE(i)] = rain_pal[BLUE(i - 1)];
  73         rain_pal[BLUE(1)] = t;
  74         vidd_load_palette(adp, rain_pal);
  75 }
  76
  77 static int
  78 rain_saver(video_adapter_t *adp, int blank)
  79 {
  80         int i, j, o, p, pl;
  81         u_char temp;
  82         int last_origin = -1;
  83
  84         if (blank) {
  85                 /* switch to graphics mode */
  86                 if (blanked <= 0) {
  87                         pl = splhigh();
  88                         vidd_set_mode(adp, scrmode);
  89                         vidd_load_palette(adp, rain_pal);
  90                         vidd_set_border(adp, 0);
  91                         blanked++;
  92                         vid = (u_char *)adp->va_window;
  93                         banksize = adp->va_window_size;
  94                         bpsl = adp->va_line_width;
  95                         splx(pl);
  96                         for (i = 0; i < bpsl*scrh; i += banksize) {
  97                                 SET_ORIGIN(adp, i);
  98                                 if ((bpsl * scrh - i) < banksize)
  99                                         bzero(vid, bpsl * scrh - i);
 100                                 else
 101                                         bzero(vid, banksize);
 102                         }
 103                         SET_ORIGIN(adp, 0);
 104                         for (i = 0, o = 0, p = 0; i < scrw; i += 2, p += 2) {
 105                                 if (p > banksize) {
 106                                         p -= banksize;
 107                                         o += banksize;
 108                                         SET_ORIGIN(adp, o);
 109                                 }
 110                                 vid[p] = 1 + (random() % MAX);
 111                         }
 112                         o = 0; p = 0;
 113                         for (j = 1; j < scrh; j++)
 114                           for (i = 0, p = bpsl * (j - 1) - o; i < scrw; i += 2, p+= 2) {
 115                                 while (p > banksize) {
 116                                         p -= banksize;
 117                                         o += banksize;
 118                                 }
 119                                 SET_ORIGIN(adp, o);
 120                                 temp = (vid[p] < MAX) ? 1 + vid[p] : 1;
 121                                 if (p + bpsl < banksize) {
 122                                         vid[p + bpsl] = temp;
 123                                 } else {
 124                                         SET_ORIGIN(adp, o + banksize);
 125                                         vid[p + bpsl - banksize] = temp;
 126                                 }
 127                           }
 128                 }
 129
 130                 /* update display */
 131                 rain_update(adp);
 132         } else {
 133                 blanked = 0;
 134         }
 135         return (0);
 136 }
 137
 138 static int
 139 rain_init(video_adapter_t *adp)
 140 {
 141         video_info_t info;
 142         int i;
 143
 144         if (!vidd_get_info(adp, M_VGA_CG320, &info)) {
 145                 scrmode = M_VGA_CG320;
 146         } else if (!vidd_get_info(adp, M_PC98_PEGC640x480, &info)) {
 147                 scrmode = M_PC98_PEGC640x480;
 148         } else if (!vidd_get_info(adp, M_PC98_PEGC640x400, &info)) {
 149                 scrmode = M_PC98_PEGC640x400;
 150         } else {
 151                 log(LOG_NOTICE,
 152                     "%s: the console does not support M_VGA_CG320\n",
 153                     SAVER_NAME);
 154                 return (ENODEV);
 155         }
 156
 157         scrw = info.vi_width;
 158         scrh = info.vi_height;
 159
 160         /* intialize the palette */
 161         for (i = 1; i < MAX; i++)
 162                 rain_pal[BLUE(i)] = rain_pal[BLUE(i - 1)] + INCREMENT;
 163
 164         return (0);
 165 }
 166
 167 static int
 168 rain_term(video_adapter_t *adp)
 169 {
 170         return (0);
 171 }
 172
 173 static scrn_saver_t rain_module = {
 174         SAVER_NAME,
 175         rain_init,
 176         rain_term,
 177         rain_saver,
 178         NULL
 179 };
 180
 181 SAVER_MODULE(rain_saver, rain_module);