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GUI: use an accumulator for wave synth preview

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issue #2735
This commit is contained in:
tildearrow 2025-12-27 17:30:19 -05:00
parent 03bdabf7a6
commit 240d3c5718
3 changed files with 16 additions and 1 deletions
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1
src/gui/gui.cpp
View file

@ -9010,6 +9010,7 @@ FurnaceGUI::FurnaceGUI():
wavePreviewHeight(255),
wavePreviewInit(true),
wavePreviewPaused(false),
wavePreviewAccum(0.0f),
pgSys(0),
pgAddr(0),
pgVal(0),

1
src/gui/gui.h
View file

@ -2470,6 +2470,7 @@ class FurnaceGUI {
DivWaveSynth wavePreview;
int wavePreviewLen, wavePreviewHeight;
bool wavePreviewInit, wavePreviewPaused;
float wavePreviewAccum;
// bit 31: ctrl
// bit 30: reserved for SDL scancode mask

15
src/gui/insEdit.cpp
View file

@ -3289,6 +3289,7 @@ void FurnaceGUI::insTabWavetable(DivInstrument* ins)
DivWavetable* wave2=e->getWave(ins->ws.wave2);
if (wavePreviewInit) {
wavePreview.init(ins,wavePreviewLen,wavePreviewHeight,true);
wavePreviewAccum=0.0f;
wavePreviewInit=false;
}
float wavePreview1[257];
@ -3315,7 +3316,19 @@ void FurnaceGUI::insTabWavetable(DivInstrument* ins)
wavePreview2[wave2->len]=wave2->data[wave2->len-1];
}
if (ins->ws.enabled && (!wavePreviewPaused || wavePreviewInit)) {
wavePreview.tick(true);
if (wavePreviewInit) {
wavePreview.tick(true);
} else {
wavePreviewAccum+=ImGui::GetIO().DeltaTime;
double accumRate=e->getCurHz();
if (accumRate<1.0) accumRate=1.0;
if (accumRate>1023.0) accumRate=1023.0;
accumRate=1.0/accumRate;
while (wavePreviewAccum>=accumRate) {
wavePreviewAccum-=accumRate;
wavePreview.tick(true);
}
}
WAKE_UP;
}
for (int i=0; i<wavePreviewLen; i++) {