PokittoLib

Diff: POKITTO_LIBS/Synth/Synth_mixfuncs.cpp

Revision:

31:f4b9b85c7b62

Child:

66:6281a40d73e6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/POKITTO_LIBS/Synth/Synth_mixfuncs.cpp	Tue Jan 30 10:41:47 2018 +0000
@@ -0,0 +1,171 @@
+/**************************************************************************/
+/*!
+    @file     Synth_mixfuncs.cpp
+    @author   Jonne Valola
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2016, Jonne Valola
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/**************************************************************************/
+
+#include "PokittoGlobs.h"
+#include "Synth.h"
+
+/** MIXING FUNCTIONS **/
+
+char voltick=0; // i need to make volume changes even slower
+uint16_t arptick=0; // i need to make volume changes even slower
+int8_t bendtick = 0; // ditto for bend.
+
+
+void mix1(){
+    // Track 1
+    if (osc1.on) {
+    Farr[osc1.wave](&osc1);
+    #if PROJ_ARDUBOY > 0
+    if (osc1.duration) {
+        /**this is special for osc1 and is only used to emulate arduino Tone(); */
+        osc1.duration--;
+    } else osc1.on = 0;
+    #endif
+
+    #ifdef POK_SIM
+    soundbyte = (((osc1.output>>8) * (osc1.adsrvol >>8 )) >> 8) >> osc1.echodiv; // To output, shift back to 8-bit
+    if (osc1.overdrive) soundbyte *= OVERDRIVE;
+    if (osc1.kick ) soundbyte >>= 2;
+    osc1.output = soundbyte;
+    #else
+    //OCR2B = osc1.output>>8;
+    #if POK_ENABLE_SOUND > 0
+    soundbyte = (((osc1.output>>8) * (osc1.adsrvol >>8 )) >> 8) >> osc1.echodiv; // To output, shift back to 8-bit
+    if (osc1.overdrive) soundbyte *= OVERDRIVE;
+    if (osc1.kick ) soundbyte >>= 2;
+    osc1.output = soundbyte;
+    #endif
+    #endif
+    }
+}
+
+void mix2(){
+    // Track 2
+    if (osc2.on) {
+    Farr[osc2.wave](&osc2);
+    #ifdef POK_SIM
+    soundbyte = (((osc2.output>>8) * (osc2.adsrvol >>8 )) >> 8) >> osc2.echodiv;
+    if (osc2.overdrive) soundbyte *= OVERDRIVE;
+    if (osc2.kick ) soundbyte >>= 2;
+    osc2.output = soundbyte;
+    #else
+    //OCR2B = osc2.output>>8;
+    #if POK_ENABLE_SOUND > 0
+    soundbyte = (((osc2.output>>8) * (osc2.adsrvol >>8 )) >> 8) >> osc2.echodiv;
+    if (osc2.overdrive) soundbyte *= OVERDRIVE;
+    if (osc2.kick ) soundbyte >>= 2;
+    osc2.output = soundbyte;
+    #endif
+    #endif
+    }
+}
+
+void mix3(){
+    // Track 3
+    if (osc3.on) {
+    Farr[osc3.wave](&osc3);
+    #ifdef POK_SIM
+    soundbyte = (((osc3.output>>8) * (osc3.adsrvol >>8 )) >> 8) >> osc3.echodiv;
+    if (osc3.overdrive) soundbyte *= OVERDRIVE;
+    if (osc3.kick ) soundbyte >>= 2;
+    osc3.output = soundbyte;
+    #else
+    //OCR2B = osc3.output>>8;
+    #if POK_ENABLE_SOUND > 0
+    soundbyte = (((osc3.output>>8) * (osc3.adsrvol >>8 )) >> 8) >> osc3.echodiv;
+    if (osc3.overdrive) soundbyte *= OVERDRIVE;
+    if (osc3.kick ) soundbyte >>= 2;
+    osc3.output = soundbyte;
+    #endif
+    #endif
+    }
+}
+
+void updateEnvelopes(){
+    //calculate volume envelopes, I do this to save cpu power
+    if (arptick) --arptick;
+    else {
+            if (osc1.arpmode && osc1.on) {
+                osc1.cinc = cincs[osc1.tonic+arptable[osc1.arpmode][osc1.arpstep]];
+                osc1.arpstep++;
+                if (osc1.arpstep==ARPSTEPMAX) osc1.arpstep = 0;
+                arptick = ARPTICK << (3-osc1.arpspeed);
+            }
+            if (osc2.arpmode && osc2.on) {
+                osc2.cinc = cincs[osc2.tonic+arptable[osc2.arpmode][osc2.arpstep]];
+                osc2.arpstep++;
+                if (osc2.arpstep==ARPSTEPMAX) osc2.arpstep = 0;
+                arptick = ARPTICK << (3-osc2.arpspeed);
+            }
+            if (osc3.arpmode && osc3.on) {
+                osc3.cinc = cincs[osc3.tonic+arptable[osc3.arpmode][osc3.arpstep]];
+                osc3.arpstep++;
+                if (osc3.arpstep==ARPSTEPMAX) osc3.arpstep = 0;
+                arptick = ARPTICK << (3-osc3.arpspeed);
+            }
+
+    }
+
+    if (voltick) --voltick;
+    else {
+            bendtick = !bendtick;
+            if (osc1.on) Earr[osc1.adsrphase](&osc1);
+            if (bendtick) osc1.pitchbend += osc1.bendrate; //slow bend to every second beat
+            if (osc1.bendrate > 0 && osc1.pitchbend > osc1.maxbend) {
+                    osc1.pitchbend = osc1.maxbend;
+                    osc1.bendrate = 0; // STOP BENDING !
+            }
+            else if (osc1.bendrate < 0 && osc1.pitchbend < osc1.maxbend) {
+                    osc1.pitchbend = osc1.maxbend;
+                    osc1.bendrate = 0; // STOP BENDING !
+            }
+
+            if (osc2.on) Earr[osc2.adsrphase](&osc2);
+            if (bendtick) osc2.pitchbend += osc2.bendrate;
+            if (osc2.bendrate > 0 && osc2.pitchbend > osc2.maxbend) osc2.pitchbend = osc2.maxbend;
+            else if (osc2.bendrate < 0 && osc2.pitchbend < osc2.maxbend) osc2.pitchbend = osc2.maxbend;
+
+            if (osc3.on) Earr[osc3.adsrphase](&osc3);
+            if (bendtick) osc3.pitchbend += osc3.bendrate;
+            if (osc3.bendrate > 0 && osc3.pitchbend > osc3.maxbend) osc3.pitchbend = osc3.maxbend;
+            else if (osc3.bendrate < 0 && osc3.pitchbend < osc3.maxbend) osc3.pitchbend = osc3.maxbend;
+
+            voltick = VOLTICK;
+    }
+    tick = 4;
+}
+
+