#ifndef FENCODE_H
#define FENCODE_H

#include "common.hlsli"

uniform float3 v_encodeZ01;
uniform float3 v_decodeZ01;

float3 encode_tcRG(float z)
{
    return z * v_encodeZ01.xyz;
}
float2 encode_tcB(float z)
{
    return z * v_encodeZ01.z;
}

// 0..1 encoding with 21 bit precision
static const float3 pe_scale = {1.f, 128.f, 16384.f};
static const float3 pe_unscale21 = {2.f / 1.f, 2.f / 128.f, 2.f / 16384.f};
static const float3 pe_unscale24 = {1.f / 1.f, 1.f / 256.f, 1.f / 65536.f};

float decode_float21(float3 rgb)
{
    return dot(rgb, pe_unscale21);
}
float decode_float24(float3 rgb)
{
    return dot(rgb, pe_unscale24);
}

#endif