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[Core/Sound] fixed MAME YM2413 core EG resolution bits (verified on YM2413B die, cf. https://www.smspower.org/Development/YM2413ReverseEngineeringNotes2015-03-20)

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ekeeke 2021-04-23 15:41:33 +02:00
parent dfeaeba925
commit de47d1db56
5 changed files with 5 additions and 1 deletions
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3
HISTORY.txt
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@ -150,6 +150,9 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
* fixed YM2612 one-sample extra delay on operator1 output
* fixed YM2612 LFO PM implementation: block & keyscale code should not be modified by LFO (verified on YM2612 die)
* fixed YM2612 Timer B overflow handling
* fixed YM2413 carrier/modulator phase reset after channel Key ON (Japanese Master System BIOS music)
* fixed YM2413 intruments ROM (verified on YM2413B die)
* fixed YM2413 EG resolution bits (verified on YM2413B die)
[Gamecube/Wii]
---------------

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builds/genesis_plus_gx_libretro.dll
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3
core/sound/ym2413.c
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@ -31,6 +31,7 @@ to do:
/** 2011/xx/xx: removed multiple chips support, cleaned code & added FM board interface **/
/** 2021/04/23: fixed synchronization of carrier/modulator phase reset after channel Key ON (fixes Japanese Master System BIOS music) **/
/** 2021/04/24: fixed intruments ROM (verified on YM2413B die, cf. https://siliconpr0n.org/archive/doku.php?id=vendor:yamaha:opl2#ym2413_instrument_rom) **/
/** 2021/04/24: fixed EG resolution bits (verified on YM2413B die, cf. https://www.smspower.org/Development/YM2413ReverseEngineeringNotes2015-03-20) **/
#include "shared.h"
@ -45,7 +46,7 @@ to do:
#define ENV_LEN (1<<ENV_BITS)
#define ENV_STEP (128.0/ENV_LEN)
#define MAX_ATT_INDEX ((1<<(ENV_BITS-2))-1) /*255*/
#define MAX_ATT_INDEX ((1<<(ENV_BITS-3))-1) /*127*/
#define MIN_ATT_INDEX (0)
/* sinwave entries */