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//
// Conway's Game of Life .. also take a look at rowca.cpp
//
// Currently only works with 16bit displays
#include <stdlib.h>
#include <stdio.h>
#include "plugin.h"
#define BORN 1
#define DYING 2
INFO("Conway's Game Of Life")
int aroundme(_frame f, int x, int y)
{
pixel16 *p;
int i=0;
p=scanline16(f, y-1);
if(p[x-1]) i++;
if(p[x]) i++;
if(p[x+1]) i++;
p=scanline16(f, y);
if(p[x-1]) i++;
if(p[x+1]) i++;
p=scanline16(f, y+1);
if(p[x-1]) i++;
if(p[x]) i++;
if(p[x+1]) i++;
return i;
}
byte *t=0;
long size=0;
void setstate(_frame f, int x, int y)
{
int i = aroundme(f, x, y);
if(i<=1 || i>=4) t[y*f.width+x]=DYING;
else if(i==3) t[y*f.width+x]=BORN;
}
void perform_effect(struct frame f, struct args a)
{
int x,y,i,r;
pixel16 *p, c;
if(f.pixelformat!=16)
{
printf("Sorry, gol works only on a 16bit display.\n");
return;
}
if(t && size != f.width*f.height)
{
free(t);
t=0;
}
if(!t)
t = malloc(size = f.width*f.height);
memset(t, 0, f.width*f.height);
for(y=2; y<f.height-3; y++)
{
p = scanline16(f, y);
for(x=2; x<f.width-3; x++)
{
if(p[x])
{
setstate(f, x-1, y-1);
setstate(f, x, y-1);
setstate(f, x+1, y-1);
setstate(f, x-1, y);
setstate(f, x, y);
setstate(f, x+1, y);
setstate(f, x-1, y+1);
setstate(f, x, y+1);
setstate(f, x+1, y+1);
}
}
}
for(y=2; y<f.height-3; y++)
{
p = scanline16(f, y);
for(x=2; x<f.width-3; x++)
{
switch(t[y*f.width+x])
{
case BORN:
p[x] = 5000;
break;
case DYING:
p[x] = 0;
break;
}
}
}
}
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