103 lines
3.4 KiB
C#
103 lines
3.4 KiB
C#
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/****************************************************************************
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Copyright (c) 2011-2013,WebJet Business Division,CYOU
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http://www.genesis-3d.com.cn
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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namespace ScriptRuntime.Graphics.PackedVector
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{
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using System;
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internal static class PackUtils
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{
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private static double ClampAndRound(float value, float min, float max)
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{
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if (float.IsNaN(value))
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{
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return 0.0;
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}
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if (float.IsInfinity(value))
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{
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return (float.IsNegativeInfinity(value) ? ((double) min) : ((double) max));
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}
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if (value < min)
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{
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return (double) min;
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}
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if (value > max)
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{
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return (double) max;
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}
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return Math.Round((double) value);
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}
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public static uint PackSigned(uint bitmask, float value)
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{
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float max = bitmask >> 1;
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float min = -max - 1f;
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return (((uint) ((int) ClampAndRound(value, min, max))) & bitmask);
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}
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public static uint PackSNorm(uint bitmask, float value)
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{
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float max = bitmask >> 1;
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value *= max;
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return (((uint) ((int) ClampAndRound(value, -max, max))) & bitmask);
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}
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public static uint PackUNorm(float bitmask, float value)
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{
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value *= bitmask;
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return (uint) ClampAndRound(value, 0f, bitmask);
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}
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public static uint PackUnsigned(float bitmask, float value)
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{
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return (uint) ClampAndRound(value, 0f, bitmask);
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}
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public static float UnpackSNorm(uint bitmask, uint value)
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{
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uint num = (uint) ((bitmask + 1) >> 1);
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if ((value & num) != 0)
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{
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if ((value & bitmask) == num)
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{
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return -1f;
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}
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value |= ~bitmask;
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}
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else
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{
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value &= bitmask;
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}
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float num2 = bitmask >> 1;
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return (((float) value) / num2);
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}
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public static float UnpackUNorm(uint bitmask, uint value)
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{
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value &= bitmask;
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return (((float) value) / ((float) bitmask));
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}
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}
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}
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