DefinesMath.cpp

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////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2009
//
//    This file is part of Scorched3D.
//
//    Scorched3D 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
//    (at your option) any later version.
//
//    Scorched3D 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 Scorched3D; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

#include <common/DefinesMath.h>
#include <common/Defines.h>

#include <math.h>
static float fastSin[628];
static float fastCos[628];
static bool calculatedFast = false;

static void calculateFast()
{
        calculatedFast = true;
        for (int i=0; i<628; i++)
        {
                float a = float(i) / 100.0f;
                fastSin[i] = (float) sin(a);
                fastCos[i] = (float) cos(a);
        }
}

float getFastSin(float angle)
{
        if (!calculatedFast) calculateFast();
        if (angle < 0.0f)
        {
                return -fastSin[(int(angle * -100)) % 628];
        }
        return fastSin[(int(angle * 100)) % 628];
}

float getFastCos(float angle)
{
        if (!calculatedFast) calculateFast();
        if (angle < 0.0f)
        {
                return fastCos[(int(angle * -100)) % 628];
        }
        return fastCos[(int(angle * 100)) % 628];
}

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