196 lines
4.6 KiB
C
196 lines
4.6 KiB
C
/*-
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* Copyright (c) 1999 Brad Forschinger
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer,
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* without modification, immediately at the beginning of the file.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* brad forschinger, 19990504 <retch@flag.blackened.net>
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*
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* written with much help from warp_saver.c
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*
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/syslog.h>
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#include <sys/consio.h>
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#include <sys/malloc.h>
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#include <sys/fbio.h>
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#include <dev/fb/fbreg.h>
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#include <dev/fb/splashreg.h>
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#include <dev/syscons/syscons.h>
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#define SAVER_NAME "fire_saver"
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#define RED(n) ((n) * 3 + 0)
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#define GREEN(n) ((n) * 3 + 1)
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#define BLUE(n) ((n) * 3 + 2)
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#define SET_ORIGIN(adp, o) do { \
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int oo = o; \
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if (oo != last_origin) \
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vidd_set_win_org(adp, last_origin = oo); \
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} while (0)
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static u_char *buf;
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static u_char *vid;
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static int banksize, scrmode, bpsl, scrw, scrh;
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static u_char fire_pal[768];
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static int blanked;
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static void
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fire_update(video_adapter_t *adp)
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{
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int x, y;
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int o, p;
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int last_origin = -1;
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/* make a new bottom line */
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for (x = 0, y = scrh; x < scrw; x++)
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buf[x + (y * bpsl)] = random() % 160 + 96;
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/* fade the flames out */
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for (y = 0; y < scrh; y++) {
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for (x = 0; x < scrw; x++) {
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buf[x + (y * scrw)] =
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(buf[(x + 0) + ((y + 0) * scrw)] +
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buf[(x - 1) + ((y + 1) * scrw)] +
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buf[(x + 0) + ((y + 1) * scrw)] +
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buf[(x + 1) + ((y + 1) * scrw)]) / 4;
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if (buf[x + (y * scrw)] > 0)
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buf[x + (y * scrw)]--;
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}
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}
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/* blit our buffer into video ram */
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for (y = 0, p = 0, o = 0; y < scrh; y++, p += bpsl) {
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while (p > banksize) {
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p -= banksize;
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o += banksize;
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}
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SET_ORIGIN(adp, o);
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if (p + scrw < banksize) {
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bcopy(buf + y * scrw, vid + p, scrw);
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} else {
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bcopy(buf + y * scrw, vid + p, banksize - p);
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SET_ORIGIN(adp, o + banksize);
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bcopy(buf + y * scrw + (banksize - p), vid,
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scrw - (banksize - p));
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p -= banksize;
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o += banksize;
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}
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}
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}
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static int
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fire_saver(video_adapter_t *adp, int blank)
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{
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int pl;
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if (blank) {
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/* switch to graphics mode */
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if (blanked <= 0) {
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pl = splhigh();
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vidd_set_mode(adp, scrmode);
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vidd_load_palette(adp, fire_pal);
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blanked++;
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vid = (u_char *)adp->va_window;
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banksize = adp->va_window_size;
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bpsl = adp->va_line_width;
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splx(pl);
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vidd_clear(adp);
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}
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fire_update(adp);
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} else {
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blanked = 0;
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}
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return 0;
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}
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static int
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fire_init(video_adapter_t *adp)
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{
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video_info_t info;
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int i, red, green, blue;
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if (!vidd_get_info(adp, M_VGA_CG320, &info)) {
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scrmode = M_VGA_CG320;
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} else {
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log(LOG_NOTICE,
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"%s: the console does not support M_VGA_CG320\n",
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SAVER_NAME);
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return (ENODEV);
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}
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scrw = info.vi_width;
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scrh = info.vi_height;
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buf = (u_char *)malloc(scrw * (scrh + 1), M_DEVBUF, M_NOWAIT);
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if (buf) {
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bzero(buf, scrw * (scrh + 1));
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} else {
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log(LOG_NOTICE,
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"%s: buffer allocation is failed\n",
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SAVER_NAME);
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return (ENODEV);
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}
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/* intialize the palette */
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red = green = blue = 0;
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for (i = 0; i < 256; i++) {
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red++;
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if (red > 128)
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green += 2;
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fire_pal[RED(i)] = red;
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fire_pal[GREEN(i)] = green;
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fire_pal[BLUE(i)] = blue;
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}
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return (0);
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}
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static int
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fire_term(video_adapter_t *adp)
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{
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free(buf, M_DEVBUF);
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return (0);
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}
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static scrn_saver_t fire_module = {
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SAVER_NAME,
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fire_init,
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fire_term,
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fire_saver,
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NULL
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};
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SAVER_MODULE(fire_saver, fire_module);
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