307 lines
8.1 KiB
C++
307 lines
8.1 KiB
C++
/**
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* Furnace Tracker - multi-system chiptune tracker
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* Copyright (C) 2021-2023 tildearrow and contributors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, 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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#include "waveSynth.h"
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#include "engine.h"
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#include "instrument.h"
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#include "../ta-log.h"
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inline bool effectOnlyAltersOutput(unsigned char effect) {
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switch (effect) {
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case DIV_WS_NONE:
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case DIV_WS_INVERT:
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case DIV_WS_ADD:
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case DIV_WS_SUBTRACT:
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case DIV_WS_AVERAGE:
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return true;
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break;
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default:
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return false;
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break;
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}
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return false;
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}
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bool DivWaveSynth::activeChanged() {
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if (activeChangedB) {
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activeChangedB=false;
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return true;
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}
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if (first) return true;
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return false;
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}
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bool DivWaveSynth::tick(bool skipSubDiv) {
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bool updated=first;
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first=false;
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if (--subDivCounter>0 && !skipSubDiv) {
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return updated;
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}
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subDivCounter=e->tickMult;
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if (!state.enabled) return updated;
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if (width<1) return false;
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if (--divCounter<=0) {
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// run effect
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switch (state.effect) {
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case DIV_WS_INVERT:
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for (int i=0; i<=state.speed; i++) {
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output[pos]=height-output[pos];
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if (++pos>=width) pos=0;
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}
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updated=true;
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break;
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case DIV_WS_ADD:
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for (int i=0; i<=state.speed; i++) {
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output[pos]+=MIN(height,state.param1);
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if (output[pos]>=height) output[pos]-=height;
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if (++pos>=width) pos=0;
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}
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updated=true;
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break;
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case DIV_WS_SUBTRACT:
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for (int i=0; i<=state.speed; i++) {
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output[pos]-=MIN(height,state.param1);
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if (output[pos]<0) output[pos]+=height;
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if (++pos>=width) pos=0;
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}
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updated=true;
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break;
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case DIV_WS_AVERAGE:
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for (int i=0; i<=state.speed; i++) {
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int pos1=(pos+1>=width)?0:(pos+1);
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output[pos]=(128+output[pos]*(256-state.param1)+output[pos1]*state.param1)>>8;
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if (output[pos]<0) output[pos]=0;
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if (output[pos]>height) output[pos]=height;
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if (++pos>=width) pos=0;
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}
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updated=true;
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break;
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case DIV_WS_PHASE:
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for (int i=0; i<=state.speed; i++) {
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output[pos]=wave1[(pos+stage)%width];
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if (++pos>=width) {
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pos=0;
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if (++stage>=width) stage=0;
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}
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}
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updated=true;
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break;
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case DIV_WS_CHORUS:
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for (int i=0; i<=state.speed; i++) {
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output[pos]=(wave1[pos]+wave1[(pos+stage)%width])>>1;
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if (++pos>=width) {
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pos=0;
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stage+=state.param1;
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while (stage>=width) stage-=width;
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}
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}
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updated=true;
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break;
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case DIV_WS_WIPE:
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for (int i=0; i<=state.speed; i++) {
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output[pos]=(stage&1)?wave1[pos]:wave2[pos];
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if (output[pos]<0) output[pos]=0;
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if (output[pos]>height) output[pos]=height;
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if (++pos>=width) {
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pos=0;
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stage=!stage;
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}
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}
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updated=true;
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break;
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case DIV_WS_FADE:
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for (int i=0; i<=state.speed; i++) {
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output[pos]=wave1[pos]+(((wave2[pos]-wave1[pos])*stage)>>9);
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if (++pos>=width) {
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pos=0;
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stage+=1+state.param1;
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if (stage>512) stage=512;
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}
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}
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updated=true;
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break;
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case DIV_WS_PING_PONG:
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for (int i=0; i<=state.speed; i++) {
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output[pos]=wave1[pos]+(((wave2[pos]-wave1[pos])*stage)>>8);
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if (++pos>=width) {
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pos=0;
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if (stageDir) {
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stage-=1+state.param1;
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if (stage<=0) {
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stageDir=false;
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stage=0;
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}
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} else {
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stage+=1+state.param1;
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if (stage>=256) {
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stageDir=true;
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stage=256;
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}
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}
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}
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}
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updated=true;
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break;
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case DIV_WS_OVERLAY:
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for (int i=0; i<=state.speed; i++) {
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output[pos]+=wave2[pos];
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if (output[pos]>=height) output[pos]-=height;
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if (++pos>=width) pos=0;
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}
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updated=true;
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break;
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case DIV_WS_NEGATIVE_OVERLAY:
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for (int i=0; i<=state.speed; i++) {
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output[pos]-=wave2[pos];
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if (output[pos]<0) output[pos]+=height;
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if (++pos>=width) pos=0;
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}
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updated=true;
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break;
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case DIV_WS_SLIDE:
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for (int i=0; i<=state.speed; i++) {
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int newPos=(pos+stage)%(width*2);
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if (newPos>=width) {
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output[pos]=wave2[newPos-width];
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} else {
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output[pos]=wave1[newPos];
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}
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if (++pos>=width) {
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pos=0;
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if (++stage>=width*2) stage=0;
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}
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}
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updated=true;
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break;
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case DIV_WS_MIX:
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for (int i=0; i<=state.speed; i++) {
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output[pos]=(wave1[pos]+wave2[(pos+stage)%width])>>1;
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if (++pos>=width) {
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pos=0;
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stage+=state.param1;
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while (stage>=width) stage-=width;
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}
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}
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updated=true;
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break;
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case DIV_WS_PHASE_MOD:
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for (int i=0; i<=state.speed; i++) {
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int mod=(wave2[pos]*(state.param2-stage)*width)/(64*(height+1));
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output[pos]=wave1[(pos+mod)%width];
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if (++pos>=width) {
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pos=0;
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stage+=state.param1;
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if (stage>state.param2) stage=state.param2;
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}
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}
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updated=true;
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break;
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}
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divCounter=state.rateDivider;
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}
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return updated;
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}
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void DivWaveSynth::setWidth(int val) {
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width=val;
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if (width<0) width=0;
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if (width>256) width=256;
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}
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#define SHALL_UPDATE_OUT (!state.enabled || force || (state.enabled && effectOnlyAltersOutput(state.effect)))
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void DivWaveSynth::changeWave1(int num, bool force) {
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DivWavetable* w1=e->getWave(num);
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if (width<1) return;
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for (int i=0; i<width; i++) {
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if (w1->max<1 || w1->len<1) {
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wave1[i]=0;
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if (SHALL_UPDATE_OUT) output[i]=0;
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} else {
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int data=w1->data[i*w1->len/width]*height/w1->max;
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if (data<0) data=0;
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if (data>height) data=height;
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wave1[i]=data;
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if (SHALL_UPDATE_OUT) output[i]=data;
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}
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}
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first=true;
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}
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void DivWaveSynth::changeWave2(int num) {
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DivWavetable* w2=e->getWave(num);
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if (width<1) return;
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for (int i=0; i<width; i++) {
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if (w2->max<1 || w2->len<1) {
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wave2[i]=0;
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} else {
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int data=w2->data[i*w2->len/width]*height/w2->max;
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if (data<0) data=0;
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if (data>height) data=height;
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wave2[i]=data;
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}
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}
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first=true;
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}
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void DivWaveSynth::setEngine(DivEngine* engine, int waveFloor) {
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e=engine;
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memset(wave1,waveFloor,256);
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memset(wave2,waveFloor,256);
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for (int i=0; i<256; i++) {
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output[i]=waveFloor;
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}
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}
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void DivWaveSynth::init(DivInstrument* which, int w, int h, bool insChanged) {
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width=w;
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height=h;
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if (width<0) width=0;
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if (width>256) width=256;
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if (e==NULL) return;
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if (which==NULL) {
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if (state.enabled) activeChangedB=true;
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state=DivInstrumentWaveSynth();
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return;
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}
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if (!which->ws.enabled) {
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if (state.enabled) activeChangedB=true;
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state=DivInstrumentWaveSynth();
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return;
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} else {
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if (!state.enabled) activeChangedB=true;
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}
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state=which->ws;
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if (insChanged || !state.global) {
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pos=0;
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stage=0;
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stageDir=false;
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divCounter=0;
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subDivCounter=0;
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changeWave1(state.wave1,true);
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changeWave2(state.wave2);
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//tick(true); // ???
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first=true;
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}
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}
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