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/*
* BB: The portable demo
*
* (C) 1997 by AA-group (e-mail: aa@horac.ta.jcu.cz)
*
* 3rd August 1997
* version: 1.2 [final3]
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public Licences as by published
* by the Free Software Foundation; either version 2; or (at your option)
* any later version
*
* This program is distributed in the hope that it will entertaining,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILTY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Publis License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "bb.h"
#define DWIDTH aa_imgwidth(context)
#define DHEIGHT aa_imgheight(context)
#define STIME 11*1000000
#define TTIME 1000000
#define N_FRAMERATE 35
#define ZTABSIZE ((int)((float)(MAXZOOM-MINZOOM)/ZOOMSTEP))
#define ZOOMSTEP 0.01
#define MINZOOM 0.80
#define MAXZOOM 2.70
#define POW4(x) (x*x*x*x)
#define RAD(angle) ((double) angle * M_PI / 180)
#define RANDOM(x) (rand()%x)
static aa_palette TempPal, Pal[2];
static char *PlasmaTbl;
static unsigned char pos1, pos2, pos3, pos4;
static unsigned int pnum;
static int dir = 1;
static void compute_custom_palette()
{
int i;
for (i = 0; i < 64; i++) {
Pal[0][i] = i * 4;
Pal[1][i] = i * 1;
}
for (i = 64; i < 128; i++) {
Pal[0][i] = (128 - i) * 4;
Pal[1][i] = (128 - i) * 1;
}
for (i = 128; i < 192; i++) {
Pal[0][i] = (i - 128) * 1;
Pal[1][i] = (i - 128) * 4;
}
for (i = 192; i < 256; i++) {
Pal[0][i] = (256 - i) * 1;
Pal[1][i] = (256 - i) * 4;
}
}
void initscene3(void)
{
int i;
float czoom;
for (czoom = MINZOOM, pnum = 0; pnum < ZTABSIZE; czoom += ZOOMSTEP, pnum++)
for (i = 0; i < 256; i++)
PlasmaTbl[(pnum << 8) + i] = (char) (((float) cos(RAD(i * 256 / 180))) * 256 / (POW4(czoom)));
compute_custom_palette();
pnum = 0;
}
static void draw_plasma(void)
{
int i, j, color;
unsigned char p1, p2, p3 = pos3, p4 = pos4;
char *text[] =
{
"STILL",
"WATCHING",
"BB",
"?",
"GREAT",
"",
"",
"NOW",
"IT'S",
"A GREAT",
"TIME",
"TO",
"FILL",
"IN",
"YOUR",
"REGISTRATION",
"CARD",
"",
"????",
"NEVER",
"MORE",
"",
"(E.A. POE)",
"..."
};
for (i = 0; i < DWIDTH; i++) {
p1 = pos1;
p2 = pos2;
for (j = 0; j < DHEIGHT; j++) {
color = PlasmaTbl[(pnum << 8) + p1] + PlasmaTbl[(pnum << 8) + p2] + PlasmaTbl[(pnum << 8) + p3] + PlasmaTbl[(pnum << 8) + p4] + PlasmaTbl[(pnum << 8) + ((unsigned char) i)] + PlasmaTbl[(pnum << 8) + ((unsigned char) j)];
aa_putpixel(context, i, j, color);
p1 += 3;
p2 += 1;
}
p3 += 2;
p4 += 3;
}
for (i = 0; i < sizeof(text) / sizeof(char *); i++) {
message(text[i], starttime + STIME + i * TTIME);
}
aa_renderpalette(context, TempPal, params, 0, 0, aa_imgwidth(context), aa_imgheight(context));
aa_flush(context);
}
static void move_plasma(void)
{
pos1 -= 4 + RANDOM(2);
pos3 += 4 + RANDOM(1);
pos2 -= RANDOM(2);
pos4 -= RANDOM(2);
pnum += dir;
if (pnum > (ZTABSIZE - 2))
dir = -1;
else if (pnum <= 0)
dir = 1;
}
static void cplasma(aa_palette dest, aa_palette src, aa_palette temp, float step)
{
int j;
for (j = 0; j < 256; j++)
temp[j] = src[j] + ((dest[j] - src[j]) * step / 64);
}
static void do_plasma(int step)
{
static int m = 0, n = 0, f = 0;
int i = 0;
if (TIME > endtime - 128 * 1000000 / N_FRAMERATE)
params->bright -= step * 2;
else {
params->bright -= step * 2;
if (params->bright < 0)
params->bright = 0;
}
if ((f += step) > 64) {
f = 0;
m = n, n = RANDOM(2);
}
cplasma(Pal[n], Pal[m], TempPal, f);
for (i = 0; i < step; i++)
move_plasma();
}
void scene3(void)
{
pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0, pnum = 0, dir = 1;
PlasmaTbl = (char *) malloc(ZTABSIZE * 256);
params->dither = AA_FLOYD_S;
initscene3();
bbwait(500000);
timestuff(-N_FRAMERATE, do_plasma, draw_plasma, 42 * 1000000);
params->bright = 0;
free(PlasmaTbl);
clrscr();
}
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