160 lines
2.8 KiB
C
160 lines
2.8 KiB
C
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/*
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==============================================================================
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This file is part of Obxd synthesizer.
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Copyright <EFBFBD> 2013-2014 Filatov Vadim
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Contact author via email :
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justdat_@_e1.ru
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This file may be licensed under the terms of of the
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GNU General Public License Version 2 (the ``GPL'').
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Software distributed under the License is distributed
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on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
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express or implied. See the GPL for the specific language
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governing rights and limitations.
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You should have received a copy of the GPL along with this
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program. If not, go to http://www.gnu.org/licenses/gpl.html
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or write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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==============================================================================
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*/
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#pragma once
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#include "SynthEngine.h"
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class Lfo
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{
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private:
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float phase;
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float s, sq, sh;
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float s1;
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Random rg;
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float SampleRate;
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float SampleRateInv;
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float syncRate;
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bool synced;
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public:
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float Frequency;
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float phaseInc;
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float frUnsc;//frequency value without sync
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float rawParam;
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int waveForm;
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Lfo()
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{
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phaseInc = 0;
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frUnsc=0;
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syncRate = 1;
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rawParam=0;
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synced = false;
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s1=0;
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Frequency=1;
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phase=0;
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s=sq=sh=0;
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rg=Random();
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}
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void setSynced()
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{
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synced = true;
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recalcRate(rawParam);
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}
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void setUnsynced()
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{
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synced = false;
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phaseInc = frUnsc;
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}
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void hostSyncRetrigger(float bpm,float quaters)
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{
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if(synced)
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{
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phaseInc = (bpm/60.0)*syncRate;
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phase = phaseInc*quaters;
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phase = (fmod(phase,1)*float_Pi*2-float_Pi);
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}
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}
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inline float getVal()
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{
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float Res = 0;
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if((waveForm &1) !=0 )
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Res+=s;
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if((waveForm&2)!=0)
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Res+=sq;
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if((waveForm&4)!=0)
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Res+=sh;
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return tptlpupw(s1, Res,3000,SampleRateInv);
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}
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void setSamlpeRate(float sr)
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{
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SampleRate=sr;
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SampleRateInv = 1 / SampleRate;
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}
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inline void update()
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{
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phase+=((phaseInc * float_Pi*2 * SampleRateInv));
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sq = (phase>0?1:-1);
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s = sin(phase);
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if(phase > float_Pi)
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{
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phase-=2*float_Pi;
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sh = rg.nextFloat()*2-1;
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}
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}
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void setFrequency(float val)
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{
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frUnsc = val;
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if(!synced)
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phaseInc = val;
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}
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void setRawParam(float param)//used for synced rate changes
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{
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rawParam = param;
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if(synced)
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{
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recalcRate(param);
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}
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}
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void recalcRate(float param)
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{
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const int ratesCount = 9;
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int parval = (int)(param*(ratesCount-1));
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float rt = 1;
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switch(parval)
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{
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case 0:
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rt = 1.0 / 8;
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break;
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case 1:
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rt = 1.0 / 4;
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break;
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case 2:
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rt = 1.0 / 3;
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break;
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case 3:
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rt = 1.0 / 2;
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break;
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case 4:
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rt = 1.0;
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break;
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case 5:
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rt = 3.0 / 2;
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break;
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case 6:
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rt = 2;
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break;
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case 7:
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rt = 3;
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break;
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case 8:
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rt = 4;
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break;
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default:
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rt = 1;
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break;
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}
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syncRate = rt;
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}
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};
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