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audio: add option to switch off SSG-EG

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This commit is contained in:
kub 2020-04-22 21:40:05 +02:00
parent 1dbda5f894
commit 324bd6852e
9 changed files with 21 additions and 17 deletions
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2
pico/sound/sound.c
View file

@ -48,7 +48,7 @@ void PsndRerate(int preserve_state)
ym2612_pack_state();
memcpy(state, YM2612GetRegs(), 0x204);
}
YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PicoIn.sndRate);
YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PicoIn.sndRate, !(PicoIn.opt&POPT_DIS_FM_SSGEG));
if (preserve_state) {
// feed it back it's own registers, just like after loading state
memcpy(YM2612GetRegs(), state, 0x204);

15
pico/sound/ym2612.c
View file

@ -1820,17 +1820,17 @@ int YM2612UpdateOne_(int *buffer, int length, int stereo, int is_buf_empty)
// flags: stereo, ssg_enabled, disabled, _, pan_r, pan_l
chan_render_prep();
#define BIT_IF(v,b,c) { v &= ~(1<<(b)); if (c) v |= 1<<(b); }
BIT_IF(flags, 1, (ym2612.ssg_mask & 0x00000f));
BIT_IF(flags, 1, (ym2612.ssg_mask & 0x00000f) && (ym2612.OPN.ST.flags & 1));
if (ym2612.slot_mask & 0x00000f) active_chs |= chan_render(buffer, length, 0, flags|((pan&0x003)<<4)) << 0;
BIT_IF(flags, 1, (ym2612.ssg_mask & 0x0000f0));
BIT_IF(flags, 1, (ym2612.ssg_mask & 0x0000f0) && (ym2612.OPN.ST.flags & 1));
if (ym2612.slot_mask & 0x0000f0) active_chs |= chan_render(buffer, length, 1, flags|((pan&0x00c)<<2)) << 1;
BIT_IF(flags, 1, (ym2612.ssg_mask & 0x000f00));
BIT_IF(flags, 1, (ym2612.ssg_mask & 0x000f00) && (ym2612.OPN.ST.flags & 1));
if (ym2612.slot_mask & 0x000f00) active_chs |= chan_render(buffer, length, 2, flags|((pan&0x030) )) << 2;
BIT_IF(flags, 1, (ym2612.ssg_mask & 0x00f000));
BIT_IF(flags, 1, (ym2612.ssg_mask & 0x00f000) && (ym2612.OPN.ST.flags & 1));
if (ym2612.slot_mask & 0x00f000) active_chs |= chan_render(buffer, length, 3, flags|((pan&0x0c0)>>2)) << 3;
BIT_IF(flags, 1, (ym2612.ssg_mask & 0x0f0000));
BIT_IF(flags, 1, (ym2612.ssg_mask & 0x0f0000) && (ym2612.OPN.ST.flags & 1));
if (ym2612.slot_mask & 0x0f0000) active_chs |= chan_render(buffer, length, 4, flags|((pan&0x300)>>4)) << 4;
BIT_IF(flags, 1, (ym2612.ssg_mask & 0xf00000));
BIT_IF(flags, 1, (ym2612.ssg_mask & 0xf00000) && (ym2612.OPN.ST.flags & 1));
if (ym2612.slot_mask & 0xf00000) active_chs |= chan_render(buffer, length, 5, flags|((pan&0xc00)>>6)|(!!ym2612.dacen<<2)) << 5;
#undef BIT_IF
chan_render_finish();
@ -1840,13 +1840,14 @@ int YM2612UpdateOne_(int *buffer, int length, int stereo, int is_buf_empty)
/* initialize YM2612 emulator */
void YM2612Init_(int clock, int rate)
void YM2612Init_(int clock, int rate, int ssg)
{
memset(&ym2612, 0, sizeof(ym2612));
init_tables();
ym2612.OPN.ST.clock = clock;
ym2612.OPN.ST.rate = rate;
ym2612.OPN.ST.flags = (ssg ? 1:0);
OPNSetPres( 6*24 );

10
pico/sound/ym2612.h
View file

@ -95,7 +95,7 @@ typedef struct
UINT8 address; /* 10 address register | need_save */
UINT8 status; /* 11 status flag | need_save */
UINT8 mode; /* mode CSM / 3SLOT */
UINT8 pad;
UINT8 flags; /* operational flags */
int TA; /* timer a */
int TAC; /* timer a maxval */
int TAT; /* timer a ticker | need_save */
@ -161,7 +161,7 @@ typedef struct
extern YM2612 ym2612;
#endif
void YM2612Init_(int baseclock, int rate);
void YM2612Init_(int baseclock, int rate, int ssg);
void YM2612ResetChip_(void);
int YM2612UpdateOne_(int *buffer, int length, int stereo, int is_buf_empty);
@ -183,9 +183,9 @@ int YM2612PicoStateLoad2(int *tat, int *tbt);
#else
/* GP2X specific */
#include "../../platform/gp2x/940ctl.h"
#define YM2612Init(baseclock,rate) do { \
if (PicoIn.opt&POPT_EXT_FM) YM2612Init_940(baseclock, rate); \
else YM2612Init_(baseclock, rate); \
#define YM2612Init(baseclock,rate,ssg) do { \
if (PicoIn.opt&POPT_EXT_FM) YM2612Init_940(baseclock, rate, ssg); \
else YM2612Init_(baseclock, rate, ssg); \
} while (0)
#define YM2612ResetChip() do { \
if (PicoIn.opt&POPT_EXT_FM) YM2612ResetChip_940(); \