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[Core/Sound] improved MAME YM2413 core EG sustain phase transition comparator accuracy (verified on YM2413 real hardware, cf. https://www.smspower.org/Development/YM2413ReverseEngineeringNotes2015-12-31)

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ekeeke 2021-04-24 11:08:49 +02:00
parent 1a1c2a1e63
commit 4950d2f042
5 changed files with 3 additions and 1 deletions
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1
HISTORY.txt
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@ -156,6 +156,7 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
* fixed YM2413 EG dump rate (verified on YM2413 hardware)
* fixed YM2413 EG behavior for fastest attack rates (verified on YM2413 hardware)
* fixed YM2413 EG behavior when SL=0 (verified on YM2413 hardware)
* improved YM2413 EG sustain phase transition comparator accuracy (verified on YM2413 real hardware)
[Gamecube/Wii]
---------------

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builds/genesis_plus_gx_libretro.dll
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builds/genplus_cube.dol
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3
core/sound/ym2413.c
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@ -35,6 +35,7 @@ to do:
/** 2021/04/24: fixed EG dump rate (verified on YM2413 real hardware, cf. https://www.smspower.org/Development/YM2413ReverseEngineeringNotes2015-12-31) **/
/** 2021/04/25: fixed EG behavior for fastest attack rates (verified on YM2413 real hardware, cf. https://www.smspower.org/Development/YM2413ReverseEngineeringNotes2017-01-26) **/
/** 2021/04/25: fixed EG behavior when SL = 0 (verified on YM2413 real hardware, cf. https://www.smspower.org/Development/YM2413ReverseEngineeringNotes2015-12-24) **/
/** 2021/04/25: improved EG sustain phase transition comparator accuracy (verified on YM2413 real hardware, cf. https://www.smspower.org/Development/YM2413ReverseEngineeringNotes2015-12-31) **/
#include "shared.h"
@ -628,7 +629,7 @@ INLINE void advance(void)
{
op->volume += eg_inc[op->eg_sel_dr + ((ym2413.eg_cnt>>op->eg_sh_dr)&7)];
if ( op->volume >= op->sl )
if ( (op->volume & ~7) == op->sl ) /* envelope level lowest 3 bits are ignored by the comparator */
op->state = EG_SUS;
}
break;