1 /*************************************************************************** 2 * * 3 * Copyright (C) 2005 Christian Schoenebeck * 4 * * 5 * This library is free software; you can redistribute it and/or modify * 6 * it under the terms of the GNU General Public License as published by * 7 * the Free Software Foundation; either version 2 of the License, or * 8 * (at your option) any later version. * 9 * * 10 * This library is distributed in the hope that it will be useful, * 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of * 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * 13 * GNU General Public License for more details. * 14 * * 15 * You should have received a copy of the GNU General Public License * 16 * along with this library; if not, write to the Free Software * 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * 18 * MA 02111-1307 USA * 19 ***************************************************************************/ 20 21 #ifndef __LS_LFOTRIANGLEINTABSMATH_H__ 22 #define __LS_LFOTRIANGLEINTABSMATH_H__ 23 24 #include <stdlib.h> 25 #include "LFOTriangleIntMath.h" 26 27 namespace LinuxSampler { 28 29 /** @brief Triangle LFO (int math implementation) 30 * 31 * This is a triangle Low Frequency Oscillator which uses pure integer 32 * math (without branches) to synthesize the triangular wave. 33 */ 34 template<LFO::range_type_t RANGE> 35 class LFOTriangleIntAbsMath : public LFOTriangleIntMath<RANGE> { 36 public: 37 /** 38 * Constructor 39 * 40 * @param Max - maximum value of the output levels 41 */ LFOTriangleIntAbsMath(float Max)42 LFOTriangleIntAbsMath(float Max) : LFOTriangleIntMath<RANGE>::LFOTriangleIntMath(Max) { 43 //NOTE: DO NOT add any custom initialization here, since it would break LFOCluster construction ! 44 } 45 46 /** 47 * Calculates exactly one sample point of the LFO wave. 48 * 49 * @returns next LFO level 50 */ render()51 inline float render() { 52 this->iLevel += this->c; 53 if (RANGE == LFO::range_unsigned) 54 return this->normalizer * (float) (abs(this->iLevel)); 55 else /* signed range */ 56 return this->normalizer * (float) (abs(this->iLevel)) + this->offset; 57 } 58 }; 59 60 } // namespace LinuxSampler 61 62 #endif // __LS_LFOTRIANGLEINTABSMATH_H__ 63