RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-05 07:17:45 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

sound, ym2612 optimizations and fixes

Browse source
This commit is contained in:
kub 2021-12-28 17:43:25 +01:00
parent 512579b031
commit 5494fde293
2 changed files with 120 additions and 65 deletions
Download patch file Download diff file Expand all files Collapse all files

75
pico/sound/ym2612.c
View file

@ -1067,10 +1067,10 @@ static int update_algo_channel(chan_rend_context *ct, unsigned int eg_out, unsig
/* +----C1----+ */
/* M1-+-MEM---M2-+-OUT */
/* +----C2----+ */
if (ct->eg_timer >= (1<<EG_SH)) break;
m2 = ct->mem;
ct->mem = c1 = c2 = ct->op1_out>>16;
if (ct->eg_timer >= (1<<EG_SH)) break;
if( eg_out < ENV_QUIET ) { /* SLOT 3 */
smp = op_calc(ct->phase3, eg_out, m2);
}
@ -1138,13 +1138,24 @@ static void chan_render_loop(chan_rend_context *ct, int *buffer, int length)
unsigned int eg_out, eg_out2, eg_out4;
ct->eg_timer += ct->eg_timer_add;
if (ct->eg_timer >= 3<<EG_SH && !(ct->pack&0xf000)) {
int cnt = (ct->eg_timer>>EG_SH)-2;
if (ct->pack & 8) { /* LFO enabled ? (test Earthworm Jim in between demo 1 and 2) */
int inc = cnt*ct->lfo_inc;
ct->pack = (ct->pack&0xffff) | (advance_lfo(ct->pack >> 16, ct->lfo_cnt, ct->lfo_cnt + inc) << 16);
ct->lfo_cnt += inc;
}
ct->phase1 += cnt*ct->incr1;
ct->phase2 += cnt*ct->incr2;
ct->phase3 += cnt*ct->incr3;
ct->phase4 += cnt*ct->incr4;
}
while (ct->eg_timer >= 1<<EG_SH) {
ct->eg_timer -= 1<<EG_SH;
if (ct->pack & 8) { /* LFO enabled ? (test Earthworm Jim in between demo 1 and 2) */
ct->pack = (ct->pack&0xffff) | (advance_lfo(ct->pack >> 16, ct->lfo_cnt, ct->lfo_cnt + ct->lfo_inc) << 16);
ct->lfo_cnt += ct->lfo_inc;
}
if (ct->pack & 2)
update_ssg_eg_channel(ct);
@ -1163,10 +1174,15 @@ static void chan_render_loop(chan_rend_context *ct, int *buffer, int length)
ct->vol_out3 = ct->CH->SLOT[SLOT3].vol_out;
ct->vol_out4 = ct->CH->SLOT[SLOT4].vol_out;
if (ct->pack & 4) goto disabled; /* output disabled */
/* calculate channel sample */
if (ct->eg_timer < (2<<EG_SH) || (ct->pack&0xf000)) {
if (ct->pack & 4) goto disabled; /* output disabled */
if (ct->pack & 8) { /* LFO enabled ? (test Earthworm Jim in between demo 1 and 2) */
ct->pack = (ct->pack&0xffff) | (advance_lfo(ct->pack >> 16, ct->lfo_cnt, ct->lfo_cnt + ct->lfo_inc) << 16);
ct->lfo_cnt += ct->lfo_inc;
}
/* calculate channel sample */
eg_out = ct->vol_out1;
if ( (ct->pack & 8) && (ct->pack&(1<<(SLOT1+8))) )
eg_out += ct->pack >> (((ct->pack&0xc0)>>6)+24);
@ -1175,36 +1191,37 @@ static void chan_render_loop(chan_rend_context *ct, int *buffer, int length)
{
int out = 0;
if (ct->pack&0xf000) out = ((ct->op1_out>>16) + ((ct->op1_out<<16)>>16)) << ((ct->pack&0xf000)>>12); /* op1_out0 + op1_out1 */
if (ct->pack&0xf000) out = ((ct->op1_out + (ct->op1_out<<16))>>16) << ((ct->pack&0xf000)>>12); /* op1_out0 + op1_out1 */
ct->op1_out <<= 16;
ct->op1_out |= (unsigned short)op_calc1(ct->phase1, eg_out, out);
} else {
ct->op1_out <<= 16; /* op1_out0 = op1_out1; op1_out1 = 0; */
}
}
if (ct->eg_timer < (2<<EG_SH)) {
eg_out = ct->vol_out3; // volume_calc(&CH->SLOT[SLOT3]);
eg_out2 = ct->vol_out2; // volume_calc(&CH->SLOT[SLOT2]);
eg_out4 = ct->vol_out4; // volume_calc(&CH->SLOT[SLOT4]);
if (ct->eg_timer < (2<<EG_SH)) {
eg_out = ct->vol_out3; // volume_calc(&CH->SLOT[SLOT3]);
eg_out2 = ct->vol_out2; // volume_calc(&CH->SLOT[SLOT2]);
eg_out4 = ct->vol_out4; // volume_calc(&CH->SLOT[SLOT4]);
if (ct->pack & 8) {
unsigned int add = ct->pack >> (((ct->pack&0xc0)>>6)+24);
if (ct->pack & (1<<(SLOT3+8))) eg_out += add;
if (ct->pack & (1<<(SLOT2+8))) eg_out2 += add;
if (ct->pack & (1<<(SLOT4+8))) eg_out4 += add;
if (ct->pack & 8) {
unsigned int add = ct->pack >> (((ct->pack&0xc0)>>6)+24);
if (ct->pack & (1<<(SLOT3+8))) eg_out += add;
if (ct->pack & (1<<(SLOT2+8))) eg_out2 += add;
if (ct->pack & (1<<(SLOT4+8))) eg_out4 += add;
}
smp = update_algo_channel(ct, eg_out, eg_out2, eg_out4);
}
smp = update_algo_channel(ct, eg_out, eg_out2, eg_out4);
}
/* done calculating channel sample */
/* done calculating channel sample */
disabled:
/* update phase counters AFTER output calculations */
ct->phase1 += ct->incr1;
ct->phase2 += ct->incr2;
ct->phase3 += ct->incr3;
ct->phase4 += ct->incr4;
/* update phase counters AFTER output calculations */
ct->phase1 += ct->incr1;
ct->phase2 += ct->incr2;
ct->phase3 += ct->incr3;
ct->phase4 += ct->incr4;
}
}
/* mix sample to output buffer */