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__kernel void fractal_gen(__global unsigned int *buffer)
{
unsigned int x = get_global_id(0);
unsigned int y = get_global_id(1);
unsigned int i = 0;
float a = -2.5+(((float)x)/(float)1024)*3.5;
float b = -1.75+(((float)y)/(float)1024)*3.5;
float2 z = (0.0, 0.0);
for (i = 0; i < 254; i++) {
// if abs(z) > 2
if (z.x*z.x + z.y*z.y > 4)
break;
float oldx = z.x;
z.x = z.x*z.x - z.y*z.y + a;
z.y = 2*oldx*z.y + b;
}
buffer[x+1024*y] = i;
}
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