freebsd-dev/sys/dev/syscons/rain/rain_saver.c
1998-12-31 13:41:40 +00:00

137 lines
3.6 KiB
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.
*
* $Id$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/syslog.h>
#include <machine/md_var.h>
#include <machine/random.h>
#include <saver.h>
static u_char *vid;
#define SCRW 320
#define SCRH 200
#define MAX 63
static u_char save_pal[768];
static u_char rain_pal[768];
static void
rain_update(void)
{
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(cur_console, rain_pal);
}
static void
rain_saver(int blank)
{
scr_stat *scp = cur_console;
static int saved_mode;
int i, j, k, pl;
if (blank) {
/* switch to graphics mode */
if (scrn_blanked <= 0) {
pl = splhigh();
saved_mode = scp->mode;
scp->mode = M_VGA_CG320;
scp->status |= SAVER_RUNNING|GRAPHICS_MODE;
save_palette(scp, save_pal);
set_mode(scp);
load_palette(scp, rain_pal);
scrn_blanked++;
vid = (u_char *)Crtat;
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();
} else {
/* return to previous video mode */
if (scrn_blanked > 0) {
if (saved_mode) {
pl = splhigh();
scrn_blanked = 0;
scp->mode = saved_mode;
scp->status &= ~(SAVER_RUNNING|GRAPHICS_MODE);
set_mode(scp);
load_palette(scp, save_pal);
saved_mode = 0;
splx(pl);
}
}
}
}
static int
rain_saver_load(void)
{
video_info_t info;
int i;
/* check that the console is capable of running in 320x200x256 */
if ((*biosvidsw.get_info)(cur_console->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;
return add_scrn_saver(rain_saver);
}
static int
rain_saver_unload(void)
{
return remove_scrn_saver(rain_saver);
}
SAVER_MODULE(rain_saver);