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/*
* The Mana Server
* Copyright (C) 2004-2010 The Mana World Development Team
*
* This file is part of The Mana Server.
*
* The Mana Server is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* The Mana Server is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with The Mana Server. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MATHUTILS_H
#define MATHUTILS_H
namespace utils {
namespace math {
/**
* A very fast function to calculate the approximate inverse square
* root of a floating point value.
*/
float fastInvSqrt(float x);
/**
* A helper function that uses the fastInvSqrt for getting the
* normal squareroot.
*/
inline float fastSqrt(float x)
{
return x * fastInvSqrt(x);
}
float cachedSin(int angle);
float cachedCos(int angle);
float cachedTan(int angle);
/**
* Pre-calculates the needed trigomic function values. Should be called before
* using cachedSin, cachedCos or cachedTan.
*/
void init();
} // namespace math
} // namespace utils
#endif
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