gistfile1.txt

// Superfast trig, x = [0.0, 1.0] only.
// Breaks for negative x.
// A circle is from x = 0 (0º) to x = 1 (360º). x = 0.5 is the same as 180º.
func sinCos(x float32) (float32, float32) {
	cos := x - 0.25 - float32(int(x+0.25))
	sin := x - float32(int(x+0.5))
	cos *= 16.0 * (abs(cos) - 0.5)
	sin *= 16.0 * (0.5 - abs(sin))
	return sin, cos
}
// Superfast sqrt
// Seriously inaccurate.
// Works by halving exponent.
func sqrt(x float32) float32 {
	return math.Float32frombits((math.Float32bits(x) + (127 << 23)) >> 1)
}