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Amiga: improve filter calc

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tildearrow 2025-03-05 05:40:39 -05:00
parent e941dfb174
commit 69a43a70fc
1 changed files with 10 additions and 6 deletions
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16
src/engine/platform/amiga.cpp
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@ -382,14 +382,18 @@ void DivPlatformAmiga::acquireDirect(blip_buffer_t** bb, size_t off, size_t len)
void DivPlatformAmiga::postProcess(short* buf, int outIndex, size_t len, int sampleRate) {
// filtering
if (amigaModel) {
filtConstOff=4000;
filtConstOn=sin(M_PI*8000.0/((double)sampleRate*2.0))*4096.0;
double filtFreq=100000.0;
if (filterOn) {
if (amigaModel) {
filtFreq=8000.0;
} else {
filtFreq=5500.0;
}
} else {
filtConstOff=sin(M_PI*16000.0/((double)sampleRate*2.0))*4096.0;
filtConstOn=sin(M_PI*5500.0/((double)sampleRate*2.0))*4096.0;
if (!amigaModel) filtFreq=16000.0;
}
filtConst=filterOn?filtConstOn:filtConstOff;
if (filtFreq>=(sampleRate/2)) return;
filtConst=sin(M_PI*filtFreq/((double)sampleRate*2.0))*4096.0;
for (size_t i=0; i<len; i++) {
filter[outIndex][0]+=(filtConst*(buf[i]-filter[outIndex][0]))>>12;