rain_saver.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1998 Dag-Erling Coïdan Smørgrav
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer
   12  *    in this position and unchanged.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. The name of the author may not be used to endorse or promote products
   17  *    derived from this software without specific prior written permission
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  *
   30  * $FreeBSD$
   31  */
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/kernel.h>
   36 #include <sys/module.h>
   37 #include <sys/syslog.h>
   38 #include <sys/consio.h>
   39 #include <sys/fbio.h>
   40 
   41 #include <dev/fb/fbreg.h>
   42 #include <dev/fb/splashreg.h>
   43 #include <dev/syscons/syscons.h>
   44 
   45 #define SAVER_NAME       "rain_saver"
   46 #ifdef MAX
   47 #undef MAX
   48 #endif
   49 #define MAX              63     /* number of colors (in addition to black) */
   50 #define INCREMENT        4      /* increment between colors */
   51 
   52 #define RED(n)           ((n) * 3 + 0)
   53 #define GREEN(n)         ((n) * 3 + 1)
   54 #define BLUE(n)          ((n) * 3 + 2)
   55 
   56 #define SET_ORIGIN(adp, o) do {                         \
   57         int oo = o;                                     \
   58         if (oo != last_origin)                          \
   59             vidd_set_win_org(adp, last_origin = oo);    \
   60         } while (0)
   61 
   62 static u_char           *vid;
   63 static int               banksize, scrmode, bpsl, scrw, scrh;
   64 static u_char            rain_pal[768];
   65 static int               blanked;
   66 
   67 static void
   68 rain_update(video_adapter_t *adp)
   69 {
   70         int i, t;
   71 
   72         t = rain_pal[BLUE(MAX)];
   73         for (i = MAX; i > 1; i--)
   74                 rain_pal[BLUE(i)] = rain_pal[BLUE(i - 1)];
   75         rain_pal[BLUE(1)] = t;
   76         vidd_load_palette(adp, rain_pal);
   77 }
   78 
   79 static int
   80 rain_saver(video_adapter_t *adp, int blank)
   81 {
   82         int i, j, o, p, pl;
   83         u_char temp;
   84         int last_origin = -1;
   85 
   86         if (blank) {
   87                 /* switch to graphics mode */
   88                 if (blanked <= 0) {
   89                         pl = splhigh();
   90                         vidd_set_mode(adp, scrmode);
   91                         vidd_load_palette(adp, rain_pal);
   92                         vidd_set_border(adp, 0);
   93                         blanked++;
   94                         vid = (u_char *)adp->va_window;
   95                         banksize = adp->va_window_size;
   96                         bpsl = adp->va_line_width;
   97                         splx(pl);
   98                         for (i = 0; i < bpsl*scrh; i += banksize) {
   99                                 SET_ORIGIN(adp, i);
  100                                 if ((bpsl * scrh - i) < banksize)
  101                                         bzero(vid, bpsl * scrh - i);
  102                                 else
  103                                         bzero(vid, banksize);
  104                         }
  105                         SET_ORIGIN(adp, 0);
  106                         for (i = 0, o = 0, p = 0; i < scrw; i += 2, p += 2) {
  107                                 if (p > banksize) {
  108                                         p -= banksize;
  109                                         o += banksize;
  110                                         SET_ORIGIN(adp, o);
  111                                 }
  112                                 vid[p] = 1 + (random() % MAX);
  113                         }
  114                         o = 0; p = 0;
  115                         for (j = 1; j < scrh; j++)
  116                           for (i = 0, p = bpsl * (j - 1) - o; i < scrw; i += 2, p+= 2) {
  117                                 while (p > banksize) {
  118                                         p -= banksize;
  119                                         o += banksize;
  120                                 }
  121                                 SET_ORIGIN(adp, o);
  122                                 temp = (vid[p] < MAX) ? 1 + vid[p] : 1;
  123                                 if (p + bpsl < banksize) {
  124                                         vid[p + bpsl] = temp;
  125                                 } else {
  126                                         SET_ORIGIN(adp, o + banksize);
  127                                         vid[p + bpsl - banksize] = temp;
  128                                 }
  129                           }
  130                 }
  131                 
  132                 /* update display */
  133                 rain_update(adp);
  134         } else {
  135                 blanked = 0;
  136         }
  137         return (0);
  138 }
  139 
  140 static int
  141 rain_init(video_adapter_t *adp)
  142 {
  143         video_info_t info;
  144         int i;
  145 
  146         if (!vidd_get_info(adp, M_VGA_CG320, &info)) {
  147                 scrmode = M_VGA_CG320;
  148         } else {
  149                 log(LOG_NOTICE,
  150                     "%s: the console does not support M_VGA_CG320\n",
  151                     SAVER_NAME);
  152                 return (ENODEV);
  153         }
  154 
  155         scrw = info.vi_width;
  156         scrh = info.vi_height;
  157 
  158         /* intialize the palette */
  159         for (i = 1; i < MAX; i++)
  160                 rain_pal[BLUE(i)] = rain_pal[BLUE(i - 1)] + INCREMENT;
  161 
  162         return (0);
  163 }
  164 
  165 static int
  166 rain_term(video_adapter_t *adp)
  167 {
  168         return (0);
  169 }
  170 
  171 static scrn_saver_t rain_module = {
  172         SAVER_NAME,
  173         rain_init,
  174         rain_term,
  175         rain_saver,
  176         NULL
  177 };
  178 
  179 SAVER_MODULE(rain_saver, rain_module);

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FreeBSD/Linux Kernel Cross Reference sys/dev/syscons/rain/rain_saver.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/syscons/rain/rain_saver.c