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