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/*
* cacaplas plasma effect for libcaca
* Copyright (c) 2004 Sam Hocevar <sam@zoy.org>
* 1998 Michele Bini <mibin@tin.it>
* All Rights Reserved
*
* $Id: cacaplas.c 236 2004-01-12 14:25:46Z sam $
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*/
#include "config.h"
#include <math.h>
#ifndef M_PI
# define M_PI 3.14159265358979323846
#endif
#include "caca.h"
/* Virtual buffer size */
#define XSIZ 256
#define YSIZ 256
#define TABLEX (XSIZ * 2)
#define TABLEY (YSIZ * 2)
static unsigned char screen[XSIZ * YSIZ];
static unsigned char table[TABLEX * TABLEY];
static void do_plasma(unsigned char *,
double, double, double, double, double, double);
int main (int argc, char **argv)
{
int red[256], green[256], blue[256], alpha[256];
double r[3], R[6];
struct caca_bitmap *bitmap;
int i, x, y, frame;
if(caca_init() < 0)
return 1;
caca_set_delay(20000);
/* Fill various tables */
for(i = 0 ; i < 256; i++)
red[i] = green[i] = blue[i] = alpha[i] = 0;
for(i = 0; i < 3; i++)
r[i] = (double)(caca_rand(1, 1000)) / 30000 * M_PI;
for(i = 0; i < 6; i++)
R[i] = (double)(caca_rand(1, 1000)) / 5000;
for(y = 0 ; y < TABLEY ; y++)
for(x = 0 ; x < TABLEX ; x++)
{
double tmp = (((double)((x - (TABLEX / 2)) * (x - (TABLEX / 2))
+ (y - (TABLEX / 2)) * (y - (TABLEX / 2))))
* (M_PI / (TABLEX * TABLEX + TABLEY * TABLEY)));
table[x + y * TABLEX] = (1.0 + sin(12.0 * sqrt(tmp))) * 256 / 6;
}
/* Create a libcaca bitmap */
bitmap = caca_create_bitmap(8, XSIZ, YSIZ, XSIZ, 0, 0, 0, 0);
/* Main loop */
for(frame = 0; !caca_get_event(CACA_EVENT_KEY_PRESS); frame++)
{
for(i = 0 ; i < 256; i++)
{
double z = ((double)i) / 256 * 6 * M_PI;
red[i] = (1.0 + cos(z + r[0] * frame)) / 2 * 0xfff;
green[i] = (1.0 + sin(z + r[1] * frame)) / 2 * 0xfff;
blue[i] = (1.0 + cos(z + r[2] * frame)) / 2 * 0xfff;
}
/* Set the palette */
caca_set_bitmap_palette(bitmap, red, green, blue, alpha);
do_plasma(screen,
(1.0 + sin(((double)frame) * R[0])) / 2,
(1.0 + sin(((double)frame) * R[1])) / 2,
(1.0 + sin(((double)frame) * R[2])) / 2,
(1.0 + sin(((double)frame) * R[3])) / 2,
(1.0 + sin(((double)frame) * R[4])) / 2,
(1.0 + sin(((double)frame) * R[5])) / 2);
caca_draw_bitmap(0, 0, caca_get_width() - 1, caca_get_height() - 1,
bitmap, screen);
caca_refresh();
}
caca_free_bitmap(bitmap);
caca_end();
return 0;
}
static void do_plasma(unsigned char *pixels, double x_1, double y_1,
double x_2, double y_2, double x_3, double y_3)
{
unsigned int X1 = x_1 * (TABLEX / 2),
Y1 = y_1 * (TABLEY / 2),
X2 = x_2 * (TABLEX / 2),
Y2 = y_2 * (TABLEY / 2),
X3 = x_3 * (TABLEX / 2),
Y3 = y_3 * (TABLEY / 2);
unsigned int y;
unsigned char * t1 = table + X1 + Y1 * TABLEX,
* t2 = table + X2 + Y2 * TABLEX,
* t3 = table + X3 + Y3 * TABLEX;
for(y = 0; y < YSIZ; y++)
{
unsigned int x;
unsigned char * tmp = pixels + y * YSIZ;
unsigned int ty = y * TABLEX, tmax = ty + XSIZ;
for(x = 0; ty < tmax; ty++, tmp++)
tmp[0] = t1[ty] + t2[ty] + t3[ty];
}
}
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