inverse square root
function Q_rsqrt(number)
{
var i;
var x2, y;
const threehalfs = 1.5;
x2 = number * 0.5;
y = number;
var buf = new ArrayBuffer(4);
(new Float32Array(buf))[0] = number;
i = (new Uint32Array(buf))[0];
i = (0x5f3759df - (i >> 1));
(new Uint32Array(buf))[0] = i;
y = (new Float32Array(buf))[0];
y = y * ( threehalfs - ( x2 * y * y ) );
return y;
}Reverse Square Root
float Q_rsqrt( float number )
{
long i;
float x2, y;
const float threehalfs = 1.5F;
x2 = number * 0.5F;
y = number;
i = * ( long * ) &y; // evil floating point bit level hacking
i = 0x5f3759df - ( i >> 1 ); // what the fuck?
y = * ( float * ) &i;
y = y * ( threehalfs - ( x2 * y * y ) ); // 1st iteration
// y = y * ( threehalfs - ( x2 * y * y ) ); // 2nd iteration, this can be removed
return y;
}Copyright © 2021 Codeinu
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