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sound, increase resolution for calculating psg sound

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This commit is contained in:
kub 2021-10-02 09:32:57 +02:00
parent eb3b1f9d72
commit 86d6fb9a2f
3 changed files with 27 additions and 22 deletions
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36
pico/sound/sound.c
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@ -161,20 +161,24 @@ PICO_INTERNAL void PsndDoDAC(int cyc_to)
Pico.snd.dac_val = dout;
}
PICO_INTERNAL void PsndDoPSG(int line_to)
PICO_INTERNAL void PsndDoPSG(int cyc_to)
{
int pos, len;
int stereo = 0;
// Q16, number of samples since last call
len = ((line_to+1) * Pico.snd.smpl_mult) - Pico.snd.psg_pos;
if (len <= 0)
return;
// number of samples to fill in buffer (Q20)
len = (cyc_to * Pico.snd.clkl_mult) - Pico.snd.psg_pos;
// update position and calculate buffer offset and length
pos = (Pico.snd.psg_pos+0x8000) >> 16;
pos = (Pico.snd.psg_pos+0x80000) >> 20;
Pico.snd.psg_pos += len;
len = ((Pico.snd.psg_pos+0x8000) >> 16) - pos;
len = ((Pico.snd.psg_pos+0x80000) >> 20) - pos;
// avoid loss of the 1st sample of a new block (Q rounding issues)
if (pos+len == 0)
len = 1, Pico.snd.psg_pos += 0x80000;
if (len <= 0)
return;
if (!PicoIn.sndOut || !(PicoIn.opt & POPT_EN_PSG))
return;
@ -187,21 +191,25 @@ PICO_INTERNAL void PsndDoPSG(int line_to)
}
#if 0
PICO_INTERNAL void PsndDoYM2413(int line_to)
PICO_INTERNAL void PsndDoYM2413(int cyc_to)
{
int pos, len;
int stereo = 0;
short *buf;
// Q16, number of samples since last call
len = ((line_to+1) * Pico.snd.smpl_mult) - Pico.snd.ym2413_pos;
if (len <= 0)
return;
// number of samples to fill in buffer (Q20)
len = (cyc_to * Pico.snd.clkl_mult) - Pico.snd.ym2413_pos;
// update position and calculate buffer offset and length
pos = (Pico.snd.ym2413_pos+0x8000) >> 16;
pos = (Pico.snd.ym2413_pos+0x80000) >> 20;
Pico.snd.ym2413_pos += len;
len = ((Pico.snd.ym2413_pos+0x8000) >> 16) - pos;
len = ((Pico.snd.ym2413_pos+0x80000) >> 20) - pos;
// avoid loss of the 1st sample of a new block (Q rounding issues)
if (pos+len == 0)
len = 1, Pico.snd.ym2413_pos += 0x80000;
if (len <= 0)
return;
if (!PicoIn.sndOut || !(PicoIn.opt & POPT_EN_YM2413))
return;