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using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public static class Packer
{
/// <summary>
/// Pack 4 low-precision [0-1] floats values to a float.
/// Each value [0-1] has 64 steps(6 bits).
/// </summary>
public static float ToFloat(float x, float y, float z, float w)
{
x = x < 0 ? 0 : 1 < x ? 1 : x;
y = y < 0 ? 0 : 1 < y ? 1 : y;
z = z < 0 ? 0 : 1 < z ? 1 : z;
w = w < 0 ? 0 : 1 < w ? 1 : w;
const int PRECISION = (1 << 6) - 1;
return (Mathf.FloorToInt(w * PRECISION) << 18)
+ (Mathf.FloorToInt(z * PRECISION) << 12)
+ (Mathf.FloorToInt(y * PRECISION) << 6)
+ Mathf.FloorToInt(x * PRECISION);
}
/// <summary>
/// Pack 4 low-precision [0-1] floats values to a float.
/// Each value [0-1] has 64 steps(6 bits).
/// </summary>
public static float ToFloat(Vector4 factor)
{
return ToFloat(Mathf.Clamp01(factor.x), Mathf.Clamp01(factor.y), Mathf.Clamp01(factor.z),
Mathf.Clamp01(factor.w));
}
/// <summary>
/// Pack 1 middle-precision & 2 low-precision [0-1] floats values to a float.
/// z value [0-1] has 4096 steps(12 bits) and xy value [0-1] has 64 steps(6 bits).
/// </summary>
public static float ToFloat(float x, float y, float z)
{
x = x < 0 ? 0 : 1 < x ? 1 : x;
y = y < 0 ? 0 : 1 < y ? 1 : y;
z = z < 0 ? 0 : 1 < z ? 1 : z;
const int PRECISION = (1 << 8) - 1;
return (Mathf.FloorToInt(z * PRECISION) << 16)
+ (Mathf.FloorToInt(y * PRECISION) << 8)
+ Mathf.FloorToInt(x * PRECISION);
}
/// <summary>
/// Pack 2 low-precision [0-1] floats values to a float.
/// Each value [0-1] has 4096 steps(12 bits).
/// </summary>
public static float ToFloat(float x, float y)
{
x = x < 0 ? 0 : 1 < x ? 1 : x;
y = y < 0 ? 0 : 1 < y ? 1 : y;
const int PRECISION = (1 << 12) - 1;
return (Mathf.FloorToInt(y * PRECISION) << 12)
+ Mathf.FloorToInt(x * PRECISION);
}
}
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