mirror of
https://github.com/deater/dos33fsprogs.git
synced 2025-10-31 09:16:03 +00:00
139 lines
2.5 KiB
C
139 lines
2.5 KiB
C
/* for demoscene, you need a plasma effect... */
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/* https://rosettacode.org/wiki/Plasma_effect */
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/* https://www.bidouille.org/prog/plasma */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <math.h>
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#include "tfv_zp.h"
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#include "gr-sim.h"
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#define PI 3.14159265358979323846264338327950
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int sine_lookup[64];
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#if 1
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static unsigned char color_lookup[]={0x0, 0x0, 0x5, 0x5,
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0x7, 0x7, 0xf, 0xf,
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0x7, 0x7, 0x6, 0x6,
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0x2, 0x2, 0x5, 0x5};
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#else
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static unsigned char color_lookup[]={0x0, 0x5, 0x7, 0xf,
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0x7, 0x6, 0x2, 0x5,
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0x0, 0x5, 0x7, 0xf,
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0x7, 0x6, 0x2, 0x5};
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#endif
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static int offscreen[40][48];
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int main(int argc, char **argv) {
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int ch,xx,yy,col;
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grsim_init();
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gr();
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soft_switch(MIXCLR);
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clear_screens();
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ram[DRAW_PAGE]=0x0;
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for(xx=0;xx<64;xx++) {
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sine_lookup[xx]=32.0*sin( (xx*2*PI)/64);
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}
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for(yy=0;yy<48;yy++) {
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for(xx=0;xx<40;xx++) {
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// col = ( 32.0 + (32.0 * sin(xx / 4.0))
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// + 32.0 + (32.0 * sin(yy / 4.0))
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// ) / 2;
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// col = ( 8.0 + (8.0 * sin(xx *PI/8.0))
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// + 8.0 + (8.0 * sin(yy *PI/8.0))
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// ) / 2;
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#if 0
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col = (int)
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(
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128.0 + (128.0 * sin(xx / 16.0))
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+ 128.0 + (128.0 * sin(yy / 8.0))
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+ 128.0 + (128.0 * sin((xx + yy) / 16.0))
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+ 128.0 + (128.0 * sin(sqrt( (double)(xx * xx + yy * yy)) / 8.0))
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) / 4;
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//#else
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col = (int)
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((
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4.0 + sin(xx / 16.0)
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+ sin(yy / 8.0)
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+ sin((xx + yy) / 16.0)
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// + sin(sqrt(xx * xx + yy * yy) / 8.0)
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)*32) ;
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printf("%d %d %d %.2f %.2f %.2f\n",xx,yy,col,
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sin(xx/16.0), sin(yy/8.0), sin((xx+yy)/16.0));
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//#endif
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#else
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// col = (int)
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// ( 128.0 + 32*sin(xx / 16.0)
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// + 32*sin(yy / 8.0)
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// + 32*sin((xx + yy) / 16.0)
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// ) ;
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col = (int)
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( 128.0 + sine_lookup[ (int)(xx/2)&0x3f ]
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+ sine_lookup[ (int)(yy/1)&0x3f ]
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+ sine_lookup[ (int)((xx + yy)/2)&0x3f ]
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) ;
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printf("%d %d %d %.2f %.2f %.2f\n",xx,yy,col,
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sin(xx/16.0), sin(yy/8.0), sin((xx+yy)/16.0));
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#endif
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offscreen[xx][yy]=col;
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}
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}
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while(1) {
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for(yy=0;yy<48;yy++) {
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for(xx=0;xx<40;xx++) {
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col=offscreen[xx][yy];
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color_equals(color_lookup[col]);
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col++;
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col&=0xf;
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offscreen[xx][yy]=col;
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plot(xx,yy);
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}
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}
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grsim_update();
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ch=grsim_input();
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if (ch=='q') exit(0);
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if (ch==' ') {
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while(1) {
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ch=grsim_input();
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if (ch) break;
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}
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}
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usleep(200000);
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}
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return 0;
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}
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