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

     /*-
      * Copyright (c) 1998 Dag-Erling Coïdan Smørgrav
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer
     *    in this position and unchanged.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/syslog.h>
    
    #include <machine/random.h>
    
    #include <saver.h>
    
    static u_char *vid;
    
    #define SCRW 320
    #define SCRH 200
    #define MAX 63
    
    static u_char rain_pal[768];
    static int blanked;
    
    static void
    rain_update(video_adapter_t *adp)
    {
        int i, t;
    
        t = rain_pal[(MAX*3+2)];
        for (i = (MAX*3+2); i > 5; i -= 3)
            rain_pal[i] = rain_pal[i-3];
        rain_pal[5] = t;
        load_palette(adp, rain_pal);
    }
    
    static int
    rain_saver(video_adapter_t *adp, int blank)
    {
        int i, j, k, pl;
    
        if (blank) {
            /* switch to graphics mode */
            if (blanked <= 0) {
                pl = splhigh();
                set_video_mode(adp, M_VGA_CG320);
                load_palette(adp, rain_pal);
    #if 0 /* XXX conflict */
                set_border(adp, 0);
    #endif
                blanked++;
                vid = (u_char *)adp->va_window;
                splx(pl);
                bzero(vid, SCRW*SCRH);
                for (i = 0; i < SCRW; i += 2)
                    vid[i] = 1 + (random() % MAX);
                for (j = 1, k = SCRW; j < SCRH; j++)
                    for (i = 0; i < SCRW; i += 2, k += 2)
                        vid[k] = (vid[k-SCRW] < MAX) ? 1 + vid[k-SCRW] : 1;
            }
    
            /* update display */
            rain_update(adp);
            
        } else {
            blanked = 0;
        }
        return 0;
    }
    
    static int
    rain_init(video_adapter_t *adp)
    {
        video_info_t info;
       int i;
   
       /* check that the console is capable of running in 320x200x256 */
       if (get_mode_info(adp, M_VGA_CG320, &info)) {
           log(LOG_NOTICE, "rain_saver: the console does not support M_VGA_CG320\n");
           return ENODEV;
       }
   
       /* intialize the palette */
       for (i = 3; i < (MAX+1)*3; i += 3)
           rain_pal[i+2] = rain_pal[i-1] + 4;
   
       blanked = 0;
   
       return 0;
   }
   
   static int
   rain_term(video_adapter_t *adp)
   {
       return 0;
   }
   
   static scrn_saver_t rain_module = {
       "rain_saver", rain_init, rain_term, rain_saver, NULL,
   };
   
   SAVER_MODULE(rain_saver, rain_module);

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