Synth_mixfuncs.cpp

00001 /**************************************************************************/
00002 /*!
00003     @file     Synth_mixfuncs.cpp
00004     @author   Jonne Valola
00005 
00006     @section LICENSE
00007 
00008     Software License Agreement (BSD License)
00009 
00010     Copyright (c) 2016, Jonne Valola
00011     All rights reserved.
00012 
00013     Redistribution and use in source and binary forms, with or without
00014     modification, are permitted provided that the following conditions are met:
00015     1. Redistributions of source code must retain the above copyright
00016     notice, this list of conditions and the following disclaimer.
00017     2. Redistributions in binary form must reproduce the above copyright
00018     notice, this list of conditions and the following disclaimer in the
00019     documentation and/or other materials provided with the distribution.
00020     3. Neither the name of the copyright holders nor the
00021     names of its contributors may be used to endorse or promote products
00022     derived from this software without specific prior written permission.
00023 
00024     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
00025     EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
00026     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00027     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
00028     DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
00029     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
00030     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
00031     ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00032     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00033     SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00034 */
00035 /**************************************************************************/
00036 
00037 #include "PokittoGlobs.h "
00038 #include "Synth.h "
00039 
00040 /** MIXING FUNCTIONS **/
00041 
00042 char voltick=0; // i need to make volume changes even slower
00043 uint16_t arptick=0; // i need to make volume changes even slower
00044 int8_t bendtick = 0; // ditto for bend.
00045 
00046 
00047 void mix1 (){
00048     // Track 1
00049     if (osc1.on) {
00050     Farr[osc1.wave](&osc1);
00051     //#if PROJ_ARDUBOY > 0
00052     if (osc1.duration) {
00053         /**this is special for osc1 and is only used to emulate arduino Tone(); */
00054         osc1.duration--;
00055     } else osc1.on = 0;
00056     //#endif
00057 
00058     #ifdef POK_SIM
00059     soundbyte = (((osc1.output>>8) * (osc1.adsrvol >>8 )) >> 8) >> osc1.echodiv; // To output, shift back to 8-bit
00060     if (osc1.overdrive) soundbyte *= OVERDRIVE;
00061     if (osc1.kick ) soundbyte >>= 2;
00062     osc1.output = soundbyte;
00063     #else
00064     //OCR2B = osc1.output>>8;
00065     #if POK_ENABLE_SOUND > 0
00066     soundbyte = (((osc1.output>>8) * (osc1.adsrvol >>8 )) >> 8) >> osc1.echodiv; // To output, shift back to 8-bit
00067     if (osc1.overdrive) soundbyte *= OVERDRIVE;
00068     if (osc1.kick ) soundbyte >>= 2;
00069     osc1.output = soundbyte;
00070     #endif
00071     #endif
00072     }
00073 }
00074 
00075 void mix2(){
00076     // Track 2
00077     if (osc2.on) {
00078     Farr[osc2.wave](&osc2);
00079     if (osc2.duration) {
00080         osc2.duration--;
00081     } else osc2.on = 0;
00082 
00083     #ifdef POK_SIM
00084     soundbyte = (((osc2.output>>8) * (osc2.adsrvol >>8 )) >> 8) >> osc2.echodiv;
00085     if (osc2.overdrive) soundbyte *= OVERDRIVE;
00086     if (osc2.kick ) soundbyte >>= 2;
00087     osc2.output = soundbyte;
00088     #else
00089     //OCR2B = osc2.output>>8;
00090     #if POK_ENABLE_SOUND > 0
00091     soundbyte = (((osc2.output>>8) * (osc2.adsrvol >>8 )) >> 8) >> osc2.echodiv;
00092     if (osc2.overdrive) soundbyte *= OVERDRIVE;
00093     if (osc2.kick ) soundbyte >>= 2;
00094     osc2.output = soundbyte;
00095     #endif
00096     #endif
00097     }
00098 }
00099 
00100 void mix3(){
00101     // Track 3
00102     if (osc3.on) {
00103     Farr[osc3.wave](&osc3);
00104     if (osc3.duration) {
00105         osc3.duration--;
00106     } else osc3.on = 0;
00107     #ifdef POK_SIM
00108     soundbyte = (((osc3.output>>8) * (osc3.adsrvol >>8 )) >> 8) >> osc3.echodiv;
00109     if (osc3.overdrive) soundbyte *= OVERDRIVE;
00110     if (osc3.kick ) soundbyte >>= 2;
00111     osc3.output = soundbyte;
00112     #else
00113     //OCR2B = osc3.output>>8;
00114     #if POK_ENABLE_SOUND > 0
00115     soundbyte = (((osc3.output>>8) * (osc3.adsrvol >>8 )) >> 8) >> osc3.echodiv;
00116     if (osc3.overdrive) soundbyte *= OVERDRIVE;
00117     if (osc3.kick ) soundbyte >>= 2;
00118     osc3.output = soundbyte;
00119     #endif
00120     #endif
00121     }
00122 }
00123 
00124 void updateEnvelopes(){
00125     //calculate volume envelopes, I do this to save cpu power
00126     #if POK_ALT_MIXING > 0
00127     if (arptick) --arptick;
00128     #else
00129     if (arptick) --arptick;
00130     #endif
00131     else {
00132             if (osc1.arpmode && osc1.on) {
00133                 osc1.cinc = cincs[osc1.tonic+arptable[osc1.arpmode][osc1.arpstep]];
00134                 osc1.arpstep++;
00135                 if (osc1.arpstep==ARPSTEPMAX) osc1.arpstep = 0;
00136                 arptick = ARPTICK << (3-osc1.arpspeed);
00137             }
00138             if (osc2.arpmode && osc2.on) {
00139                 osc2.cinc = cincs[osc2.tonic+arptable[osc2.arpmode][osc2.arpstep]];
00140                 osc2.arpstep++;
00141                 if (osc2.arpstep==ARPSTEPMAX) osc2.arpstep = 0;
00142                 arptick = ARPTICK << (3-osc2.arpspeed);
00143             }
00144             if (osc3.arpmode && osc3.on) {
00145                 osc3.cinc = cincs[osc3.tonic+arptable[osc3.arpmode][osc3.arpstep]];
00146                 osc3.arpstep++;
00147                 if (osc3.arpstep==ARPSTEPMAX) osc3.arpstep = 0;
00148                 arptick = ARPTICK << (3-osc3.arpspeed);
00149             }
00150 
00151     }
00152 
00153     #if POK_ALT_MIXING > 0
00154     if (voltick) --voltick;
00155     #else
00156     if (voltick) --voltick;
00157     #endif
00158     else {
00159             bendtick = !bendtick;
00160             if (osc1.on) Earr[osc1.adsrphase](&osc1);
00161             if (bendtick) {
00162                     osc1.pitchbend += osc1.bendrate; //slow bend to every second beat
00163                     /*if (osc1.wave == 6 && osc1.bendrate) {
00164                         if (osc1.samplebendtick > osc1.samplebendcount) {
00165                             if (osc1.bendrate>0) osc1.samplestep++;
00166                             else if (osc1.bendrate<0) osc1.samplestep--;
00167                             osc1.samplebendtick=0;
00168                         } else osc1.samplebendtick++;
00169 
00170                     }*/
00171             }
00172             if (osc1.bendrate > 0 && osc1.pitchbend > osc1.maxbend) {
00173                     osc1.pitchbend = osc1.maxbend;
00174                     osc1.bendrate = 0; // STOP BENDING !
00175             }
00176             else if (osc1.bendrate < 0 && osc1.pitchbend < osc1.maxbend) {
00177                     osc1.pitchbend = osc1.maxbend;
00178                     osc1.bendrate = 0; // STOP BENDING !
00179             }
00180 
00181             if (osc2.on) Earr[osc2.adsrphase](&osc2);
00182             if (bendtick) osc2.pitchbend += osc2.bendrate;
00183             if (osc2.bendrate > 0 && osc2.pitchbend > osc2.maxbend) osc2.pitchbend = osc2.maxbend;
00184             else if (osc2.bendrate < 0 && osc2.pitchbend < osc2.maxbend) osc2.pitchbend = osc2.maxbend;
00185 
00186             if (osc3.on) Earr[osc3.adsrphase](&osc3);
00187             if (bendtick) osc3.pitchbend += osc3.bendrate;
00188             if (osc3.bendrate > 0 && osc3.pitchbend > osc3.maxbend) osc3.pitchbend = osc3.maxbend;
00189             else if (osc3.bendrate < 0 && osc3.pitchbend < osc3.maxbend) osc3.pitchbend = osc3.maxbend;
00190 
00191             voltick = VOLTICK;
00192     }
00193     tick = 4;
00194 }
00195 
00196