Simple Mandelbrot fractal for OSX and iOS
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#version 100
varying highp vec2 pos;
varying highp vec2 start;
void main(){
highp vec2 z = start;
int i = 0;
for (i = 0; i < 7; i++) {
highp vec2 zsq = z*z;
if(zsq.x + zsq.y > 16.0) break;
highp float t = zsq.x - zsq.y + pos.x;
z.y = 2.0*z.x*z.y + pos.y;
z.x = t;
}
gl_FragColor = vec4(float(i) / 7.0);
gl_FragColor.bg = 0.5 * sin(z) + 0.5;
}