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__kernel void fractal_gen(
__global unsigned char *buffer,
const unsigned int size,
const unsigned long iterations)
{
unsigned int x = get_global_id(0);
unsigned int y = get_global_id(1);
unsigned long i = 0;
float a = -2.5+(((float)x)/size)*3.5;
float b = -1.75+(((float)y)/size)*3.5;
float2 z = (0.0, 0.0);
for (i = 0; i < iterations; i++) {
// if abs(z) > 2
if (z.x*z.x + z.y*z.y > 4)
break;
float arez = fabs(z.x);
float aimz = fabs(z.y);
z.x = arez*arez - aimz*aimz + a;
z.y = 2*aimz*arez + b;
}
buffer[(size*y)+x] = (i*255)/iterations;
}
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