66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
#pragma region License
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/*******************************************************************************
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Copyright (c) 2005-2009 David Williams
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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*******************************************************************************/
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#pragma endregion
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#ifndef __PolyVox_Utility_H__
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#define __PolyVox_Utility_H__
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#include "CPlusPlusZeroXSupport.h"
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#include "TypeDef.h"
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#include <cassert>
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namespace PolyVox
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{
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POLYVOXCORE_API uint8_t logBase2(uint32_t uInput);
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POLYVOXCORE_API bool isPowerOf2(uint32_t uInput);
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template <typename Type>
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Type trilinearlyInterpolate(
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const Type& v000,const Type& v100,const Type& v010,const Type& v110,
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const Type& v001,const Type& v101,const Type& v011,const Type& v111,
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const float x, const float y, const float z)
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{
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assert((x >= 0.0f) && (y >= 0.0f) && (z >= 0.0f) &&
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(x <= 1.0f) && (y <= 1.0f) && (z <= 1.0f));
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//Interpolate along X
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Type v000_v100 = (v100 - v000) * x + v000;
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Type v001_v101 = (v101 - v001) * x + v001;
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Type v010_v110 = (v110 - v010) * x + v010;
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Type v011_v111 = (v111 - v011) * x + v011;
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//Interpolate along Y
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Type v000_v100__v010_v110 = (v010_v110 - v000_v100) * y + v000_v100;
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Type v001_v101__v011_v111 = (v011_v111 - v001_v101) * y + v001_v101;
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//Interpolate along Z
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Type v000_v100__v010_v110____v001_v101__v011_v111 = (v001_v101__v011_v111 - v000_v100__v010_v110) * z + v000_v100__v010_v110;
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return v000_v100__v010_v110____v001_v101__v011_v111;
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}
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}
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#endif
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