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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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15
pico/sound/ym2612.c
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@ -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 );