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Use bsr() in frequency shift calculations

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This commit is contained in:
Natt Akuma 2024-09-18 13:05:45 +07:00
parent 9905981e61
commit 6a58797669
6 changed files with 77 additions and 145 deletions
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7
src/gui/fmPreview.cpp
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@ -27,6 +27,7 @@ extern "C" {
#include "../../extern/Nuked-OPLL/opll.h"
}
#include "../engine/platform/sound/ymfm/ymfm_opz.h"
#include "../engine/bsr.h"
#define OPN_WRITE(addr,val) \
OPN2_Write((ym3438_t*)fmPreviewOPN,0,(addr)); \
@ -388,9 +389,9 @@ void FurnaceGUI::renderFMPreviewESFM(const DivInstrumentFM& params, const DivIns
double fbase=(mult0?2048.0:1024.0)*pow(2.0,(float)offset/(128.0*12.0));
int bf=round(fbase);
int block=0;
while (bf>0x3ff) {
bf>>=1;
block++;
if (bf>0x3ff) {
block=bsr32(bf)-10;
bf>>=block;
}
freqL=bf&0xff;
freqH=((block&7)<<2)|((bf>>8)&3);