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FDS: fix NSFplay core low pass filter precision 

closes #427
This commit is contained in:
tildearrow 2022-05-26 18:03:57 -05:00
parent 7cf853797a
commit a52f71ba32
1 changed files with 3 additions and 3 deletions
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6
src/engine/platform/sound/nes_nsfplay/nes_fds.cpp
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@ -243,7 +243,7 @@ unsigned int NES_FDS::Render (int b[2])
int((MASTER_VOL / MAX_OUT) * 256.0 * 2.0f / 4.0f),
int((MASTER_VOL / MAX_OUT) * 256.0 * 2.0f / 5.0f) };
int v = fout * MASTER[master_vol] >> 8;
int v = fout * MASTER[master_vol] >> 1;
// lowpass RC filter
int rc_out = ((rc_accum * rc_k) + (v * rc_l)) >> RC_BITS;
@ -252,8 +252,8 @@ unsigned int NES_FDS::Render (int b[2])
// output mix
int m = mask ? 0 : v;
b[0] = (m * sm[0]) >> 7;
b[1] = (m * sm[1]) >> 7;
b[0] = (m * sm[0]) >> 14;
b[1] = (m * sm[1]) >> 14;
return 2;
}