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sound, fix ym2612 ladder effect, add option

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This commit is contained in:
kub 2021-11-19 21:01:50 +01:00
parent b55e4e1b2f
commit 23cd73bc8f
9 changed files with 46 additions and 22 deletions
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2
pico/pico.h
View file

@ -75,7 +75,7 @@ extern void *p32x_bios_g, *p32x_bios_m, *p32x_bios_s;
#define POPT_EN_PWM (1<<21)
#define POPT_PWM_IRQ_OPT (1<<22)
#define POPT_DIS_FM_SSGEG (1<<23)
#define POPT_EN_FM_LADDER (1<<24) //x00 0000
#define POPT_EN_FM_DAC (1<<24) //x00 0000
#define PAHW_MCD (1<<0)
#define PAHW_32X (1<<1)

2
pico/sound/sound.c
View file

@ -69,7 +69,7 @@ void PsndRerate(int preserve_state)
}
YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PicoIn.sndRate,
((PicoIn.opt&POPT_DIS_FM_SSGEG) ? 0 : ST_SSG) |
((PicoIn.opt&POPT_EN_FM_LADDER) ? ST_LADDER : 0));
((PicoIn.opt&POPT_EN_FM_DAC) ? ST_DAC : 0));
if (preserve_state) {
// feed it back it's own registers, just like after loading state
memcpy(YM2612GetRegs(), state, 0x204);

20
pico/sound/ym2612.c
View file

@ -922,7 +922,8 @@ typedef struct
static int clip(int n)
{
unsigned b = 14, s = n < 0;
if (s + (n>>(b-1))) n = (int)(s + INT_MAX) >> (8*sizeof(int)-b);
int m = s + INT_MAX;
if (s + (n>>(b-1))) n = m >> (8*sizeof(int)-b);
return n;
}
@ -1234,7 +1235,11 @@ static void chan_render_loop(chan_rend_context *ct, int *buffer, int length)
/* mix sample to output buffer */
if (smp) {
smp = clip(smp); /* saturate to 14 bit */
smp = clip(smp); /* saturate to 14 bit */
if (ct->algo & 0x80) {
smp &= ~0x1f; /* drop bits (DAC has 9 bits) */
smp -= (smp < 0 ? 7:0) << 5; /* discontinuity */
}
if (ct->pack & 1) { /* stereo */
if (ct->pack & 0x20) /* L */ /* TODO: check correctness */
buffer[scounter*2] += smp;
@ -1271,15 +1276,6 @@ static void chan_render_finish(int *buffer, unsigned short length, int active_ch
ym2612.OPN.eg_timer = crct.eg_timer;
g_lfo_ampm = crct.pack >> 16; // need_save
ym2612.OPN.lfo_cnt = crct.lfo_cnt;
/* apply ladder effect. NB only works if buffer was empty beforehand! */
if (active_chans && (ym2612.OPN.ST.flags & ST_LADDER)) {
length <<= crct.pack & 1;
while (length--) {
*buffer -= (*buffer < 0)*4 << 5;
buffer++;
}
}
}
static UINT32 update_lfo_phase(FM_SLOT *SLOT, UINT32 block_fnum)
@ -1339,6 +1335,8 @@ static int chan_render(int *buffer, int length, int c, UINT32 flags) // flags: s
crct.op1_out = crct.CH->op1_out;
crct.algo = crct.CH->ALGO & 7;
if (ym2612.OPN.ST.flags & ST_DAC)
crct.algo |= 0x80;
if(crct.CH->pms && (ym2612.OPN.ST.mode & 0xC0) && c == 2) {
/* 3 slot mode */

2
pico/sound/ym2612.h
View file

@ -109,7 +109,7 @@ typedef struct
} FM_ST;
#define ST_SSG 1
#define ST_LADDER 2
#define ST_DAC 2
/***********************************************************/
/* OPN unit */

11
pico/sound/ym2612_arm.S
View file

@ -677,7 +677,7 @@
@ lr=context, r12=pack (stereo, ssg_enabled, disabled, lfo_enabled | pan_r, pan_l, ams[2] | AMmasks[4] | FB[4] | lfo_ampm[16])
@ r0-r2=scratch, r3=sin_tab/scratch, r4=(length<<8)|unused[3],ssg_update,was_update,algo[3], r5=tl_tab/slot,
@ r0-r2=scratch, r3=sin_tab/scratch, r4=(length<<8)|dac,unused[2],ssg_update,was_update,algo[3], r5=tl_tab/slot,
@ r6-r7=vol_out[4], r8=eg_timer, r9=eg_timer_add[31:16], r10=op1_out, r11=buffer
.global chan_render_loop @ chan_rend_context *ct, int *buffer, int length
@ -688,8 +688,8 @@ chan_render_loop:
ldr r12, [lr, #0x4c]
ldr r0, [lr, #0x50]
mov r11, r1
and r0, r0, #7
orr r4, r4, r0 @ (length<<8)|algo
and r0, r0, #0x87
orr r4, r4, r0 @ (length<<8)|dac,unused[4],algo[3]
ldr r8, [lr, #0x44] @ eg_timer
ldr r9, [lr, #0x48] @ eg_timer_add
ldr r10, [lr, #0x54] @ op1_out
@ -925,9 +925,12 @@ crl_algo_done:
beq ctl_sample_skip
orr r4, r4, #8 @ have_output
lsr r1, r0, #31 @ clip (saturate) sample to 14 bit
adds r2, r1, r0, asr #13
cmn r1, r0, asr #13
subne r0, r1, #0x80000001
asrne r0, r0, #18
tst r4, r1, lsl #7 @ (sample < 0) && dac?
bicne r0, r0, #0x1f
subne r0, r0, #7<<5
tst r12, #1
beq ctl_sample_mono