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implement some dual wave synth effects

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tildearrow 2022-05-21 14:05:23 -05:00
parent 70ead337f3
commit b38a1cfb55
2 changed files with 55 additions and 2 deletions
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52
src/engine/waveSynth.cpp
View file

@ -85,14 +85,65 @@ bool DivWaveSynth::tick() {
updated=true;
break;
case DIV_WS_WIPE:
for (int i=0; i<=state.speed; i++) {
output[pos]=(stage&1)?wave1[pos]:wave2[pos];
if (output[pos]<0) output[pos]=0;
if (output[pos]>height) output[pos]=height;
if (++pos>=width) {
pos=0;
stage=!stage;
}
}
updated=true;
break;
case DIV_WS_FADE:
for (int i=0; i<=state.speed; i++) {
output[pos]=wave1[pos]+(((wave2[pos]-wave1[pos])*stage)>>9);
if (++pos>=width) {
pos=0;
stage+=1+state.param1;
if (stage>512) stage=512;
}
}
updated=true;
break;
case DIV_WS_PING_PONG:
for (int i=0; i<=state.speed; i++) {
output[pos]=wave1[pos]+(((wave2[pos]-wave1[pos])*stage)>>8);
if (++pos>=width) {
pos=0;
if (stageDir) {
stage-=1+state.param1;
if (stage<=0) {
stageDir=false;
stage=0;
}
} else {
stage+=1+state.param1;
if (stage>=256) {
stageDir=true;
stage=256;
}
}
}
}
updated=true;
break;
case DIV_WS_OVERLAY:
for (int i=0; i<=state.speed; i++) {
output[pos]+=wave2[pos];
if (output[pos]>=height) output[pos]-=height;
if (++pos>=width) pos=0;
}
updated=true;
break;
case DIV_WS_NEGATIVE_OVERLAY:
for (int i=0; i<=state.speed; i++) {
output[pos]-=wave2[pos];
if (output[pos]<0) output[pos]+=height;
if (++pos>=width) pos=0;
}
updated=true;
break;
case DIV_WS_PHASE_DUAL:
break;
@ -169,6 +220,7 @@ void DivWaveSynth::init(DivInstrument* which, int w, int h, bool insChanged) {
if (insChanged || !state.global) {
pos=0;
stage=0;
stageDir=false;
divCounter=1+state.rateDivider;
subDivCounter=0;
first=true;

5
src/engine/waveSynth.h
View file

@ -29,7 +29,7 @@ class DivWaveSynth {
DivEngine* e;
DivInstrumentWaveSynth state;
int pos, stage, divCounter, width, height, subDivCounter;
bool first, activeChangedB;
bool first, activeChangedB, stageDir;
unsigned char wave1[256];
unsigned char wave2[256];
public:
@ -80,7 +80,8 @@ class DivWaveSynth {
height(31),
subDivCounter(0),
first(false),
activeChangedB(false) {
activeChangedB(false),
stageDir(false) {
memset(wave1,0,256);
memset(wave2,0,256);
memset(output,0,sizeof(int)*256);