warp_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       "warp_saver"
   46 #define SPP              15
   47 #define STARS            (SPP * (1 + 2 + 4 + 8))
   48 
   49 #define SET_ORIGIN(adp, o) do {                         \
   50         int oo = o;                                     \
   51         if (oo != last_origin)                          \
   52             vidd_set_win_org(adp, last_origin = oo);            \
   53         } while (0)
   54 
   55 static u_char           *vid;
   56 static int               banksize, scrmode, bpsl, scrw, scrh;
   57 static int               blanked;
   58 static int               star[STARS];
   59 static u_char            warp_pal[768] = {
   60         0x00, 0x00, 0x00,
   61         0x66, 0x66, 0x66,
   62         0x99, 0x99, 0x99,
   63         0xcc, 0xcc, 0xcc,
   64         0xff, 0xff, 0xff
   65         /* the rest is zero-filled by the compiler */
   66 };
   67 
   68 static void
   69 warp_update(video_adapter_t *adp)
   70 {
   71         int i, j, k, n, o, p;
   72         int last_origin = -1;
   73 
   74         for (i = 1, k = 0, n = SPP*8; i < 5; i++, n /= 2) {
   75                 for (j = 0; j < n; j++, k++) {
   76                         p = (star[k] / scrw) *  bpsl + (star[k] % scrw);
   77                         o = 0;
   78                         while (p > banksize) {
   79                                 p -= banksize;
   80                                 o += banksize;
   81                         }
   82                         SET_ORIGIN(adp, o);
   83                         vid[p] = 0;
   84                         star[k] += i;
   85                         if (star[k] > scrw*scrh)
   86                                 star[k] -= scrw*scrh;
   87                         p = (star[k] / scrw) *  bpsl + (star[k] % scrw);
   88                         o = 0;
   89                         while (p > banksize) {
   90                                 p -= banksize;
   91                                 o += banksize;
   92                         }
   93                         SET_ORIGIN(adp, o);
   94                         vid[p] = i;
   95                 }
   96         }
   97 }
   98 
   99 static int
  100 warp_saver(video_adapter_t *adp, int blank)
  101 {
  102         int pl;
  103 
  104         if (blank) {
  105                 /* switch to graphics mode */
  106                 if (blanked <= 0) {
  107                         pl = splhigh();
  108                         vidd_set_mode(adp, scrmode);
  109                         vidd_load_palette(adp, warp_pal);
  110                         vidd_set_border(adp, 0);
  111                         blanked++;
  112                         vid = (u_char *)adp->va_window;
  113                         banksize = adp->va_window_size;
  114                         bpsl = adp->va_line_width;
  115                         splx(pl);
  116                         vidd_clear(adp);
  117                 }
  118                 /* update display */
  119                 warp_update(adp);
  120         } else {
  121                 blanked = 0;
  122         }
  123         return (0);
  124 }
  125 
  126 static int
  127 warp_init(video_adapter_t *adp)
  128 {
  129         video_info_t info;
  130         int i;
  131 
  132         if (!vidd_get_info(adp, M_VGA_CG320, &info)) {
  133                 scrmode = M_VGA_CG320;
  134         } else {
  135                 log(LOG_NOTICE,
  136                     "%s: the console does not support M_VGA_CG320\n",
  137                     SAVER_NAME);
  138                 return (ENODEV);
  139         }
  140 
  141         scrw = info.vi_width;
  142         scrh = info.vi_height;
  143 
  144         /* randomize the star field */
  145         for (i = 0; i < STARS; i++)
  146                 star[i] = random() % (scrw * scrh);
  147 
  148         return (0);
  149 }
  150 
  151 static int
  152 warp_term(video_adapter_t *adp)
  153 {
  154         return (0);
  155 }
  156 
  157 static scrn_saver_t warp_module = {
  158         SAVER_NAME,
  159         warp_init,
  160         warp_term,
  161         warp_saver,
  162         NULL
  163 };
  164 
  165 SAVER_MODULE(warp_saver, warp_module);

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FreeBSD/Linux Kernel Cross Reference sys/dev/syscons/warp/warp_saver.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/syscons/warp/warp_saver.c