Date: Sun, 4 Nov 2001 15:18:41 -0800 From: Marcus Reid <marcus@blazingdot.com> To: freebsd-chat@FreeBSD.Org Subject: simplicity_saver Message-ID: <20011104151840.A13030@blazingdot.com>
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Hi:
I thought I'd share this screensaver module that I wrote. I find it
interesting what the effect is achieved with only a few lines of code,
yet it looks very complicated.
--
Marcus Reid
Blazingdot
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety." -- Benjamin Franklin, 1759
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KMOD= simplicity_saver
SRCS= simplicity_saver.c
CWARNFLAGS= -Wall -pedantic
.include <bsd.kmod.mk>
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/*-
* Copyright (c) 2001 Marcus L. Reid
* 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,
* without modification, immediately at the beginning of the file.
* 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.
*
* 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.
*
*/
/*
* 20011103 Marcus L. Reid <marcus@punq.net>
*
* written with much help from fire_saver.c
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/syslog.h>
#include <sys/consio.h>
#include <sys/fbio.h>
#include <dev/fb/fbreg.h>
#include <dev/fb/splashreg.h>
#include <dev/syscons/syscons.h>
#define X_SIZE 320
#define Y_SIZE 200
static int blanked;
static u_char k_pal[768];
static u_char buf[X_SIZE * (Y_SIZE + 1)];
static u_char *vid;
static int z, cv;
static int
simplicity_saver(video_adapter_t *adp, int blank)
{
int x, y;
if (blank) {
if (blanked <= 0) {
int red, green, blue;
int palette_index;
set_video_mode(adp, M_VGA_CG320);
/* build and load palette */
red = green = blue = 0;
for (palette_index = 0; palette_index < 256; palette_index++) {
if(palette_index < 64) {
k_pal[(palette_index * 3) + 0] = palette_index * 4;
k_pal[(palette_index * 3) + 1] = 0;
k_pal[(palette_index * 3) + 2] = 0;
} else if(palette_index < 128) {
k_pal[(palette_index * 3) + 0] = 0;
k_pal[(palette_index * 3) + 1] = (palette_index - 64) * 4;
k_pal[(palette_index * 3) + 2] = 0;
} else if(palette_index < 192) {
k_pal[(palette_index * 3) + 0] = 0;
k_pal[(palette_index * 3) + 1] = 0;
k_pal[(palette_index * 3) + 2] = (palette_index - 128) * 4;
} else if(palette_index < 256) {
k_pal[(palette_index * 3) + 0] = (palette_index - 192) * 4;
k_pal[(palette_index * 3) + 1] = (palette_index - 192) * 4;
k_pal[(palette_index * 3) + 2] = (palette_index - 192) * 4;
}
}
load_palette(adp, k_pal);
blanked++;
vid = (u_char *) adp->va_window;
}
/* Now that we have the colors, time for simple magic. */
for (y = 0; y < Y_SIZE; cv += y++) {
for (x = 0; x < X_SIZE; cv += x++) {
buf[y*X_SIZE+x] = cv % 256;
}
}
cv += z++;
/* Done. */
/* blit our buffer into video ram */
memcpy(vid, buf, X_SIZE * Y_SIZE);
} else {
blanked = 0;
}
return 0;
}
static int
simplicity_initialise(video_adapter_t *adp)
{
video_info_t info;
/* check that the console is capable of running in 320x200x256 */
if (get_mode_info(adp, M_VGA_CG320, &info)) {
log(LOG_NOTICE, "simplicity_saver: the console does not support M_VGA_CG320\n");
return (ENODEV);
}
blanked = 0;
z = 0;
return 0;
}
static int
simplicity_terminate(video_adapter_t *adp)
{
return 0;
}
static scrn_saver_t simplicity_module = {
"simplicity_saver", simplicity_initialise, simplicity_terminate, simplicity_saver, NULL
};
SAVER_MODULE(simplicity_saver, simplicity_module);
--FCuugMFkClbJLl1L--
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