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/*
* brad forschinger, 19990504
* <retch@flag.blackened.net>
*
* written with much help from warp_saver.c
*
*/
#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>
#define X_SIZE 320
#define Y_SIZE 200
int blanked;
u_char fire_pal[768];
u_char buf[X_SIZE * (Y_SIZE + 1)];
int fire_saver(video_adapter_t *adp, int blank) {
static u_char *vid;
int x, y;
if (blank) {
if (blanked <= 0) {
int red, green, blue;
int palette_index;
set_video_mode(adp, M_VGA_CG320);
/* build palette */
red = green = blue = 0;
for (palette_index = 0; palette_index < 256; palette_index++) {
red++;
if (red > 128)
green += 2;
fire_pal[(palette_index * 3) + 0] = red;
fire_pal[(palette_index * 3) + 1] = green;
fire_pal[(palette_index * 3) + 2] = blue;
}
load_palette(adp, fire_pal);
blanked++;
vid = (u_char *)adp->va_window;
}
/* make a new bottom line */
for (x = 0, y = Y_SIZE; x < X_SIZE; x++)
buf[x + (y * X_SIZE)] = random() % 160 + 96;
/* fade the flames out */
for (y = 0; y < Y_SIZE; y++) {
for (x = 0; x < X_SIZE; x++) {
buf[x + (y * X_SIZE)] = (buf[(x + 0) + ((y + 0) * X_SIZE)] +
buf[(x - 1) + ((y + 1) * X_SIZE)] +
buf[(x + 0) + ((y + 1) * X_SIZE)] +
buf[(x + 1) + ((y + 1) * X_SIZE)]) / 4;
if (buf[x + (y * X_SIZE)] > 0)
buf[x + (y * X_SIZE)]--;
}
}
/* put our buffer into video ram */
memcpy(vid, buf, X_SIZE * Y_SIZE);
} else {
blanked = 0;
}
return(0);
}
int fire_initialise(video_adapter_t *adp) {
video_info_t info;
if (get_mode_info(adp, M_VGA_CG320, &info)) {
log(LOG_NOTICE, "fire_saver: the console does not support M_VGA_CG320\n");
return(ENODEV);
}
blanked = 0;
return(0);
}
int fire_terminate(video_adapter_t *adp) {
return(0);
}
static scrn_saver_t fire_module = {
"fire_saver", fire_initialise, fire_terminate, fire_saver, NULL
};
SAVER_MODULE(fire_saver, fire_module);
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