#ifndef __RANDOM_GLSL__
#define __RANDOM_GLSL__

#define _ONE_AT_A_TIME_
//#define _XOSHIRO_

#include "one-at-a-time.glsl"
#include "xoshiro.glsl"

// Construct a float with half-open range [0:1] using low 23 bits.
// All zeroes yields 0.0, all ones yields the next smallest representable value below 1.0.
float floatConstruct(in uint m) {
    const uint ieeeMantissa = 0x007FFFFFu; // binary32 mantissa bitmask
    const uint ieeeOne = 0x3F800000u; // 1.0 in IEEE binary32

    m &= ieeeMantissa;                     // Keep only mantissa bits (fractional part)
    m |= ieeeOne;                          // Add fractional part to 1.0

    return uintBitsToFloat(m) - 1.0;
}

void init_random_state(in float seed) {
    INIT_STATE_FUNCTION(seed);
}

float random() {
    return floatConstruct(HASH_FUNCTION());
}

#endif