62 lines
2.2 KiB
C++
62 lines
2.2 KiB
C++
#pragma region License
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/******************************************************************************
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This file is part of the PolyVox library
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Copyright (C) 2006 David Williams
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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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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