Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-27 10:43:07 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

small improvement to loop offset and final volume

Browse Source
This commit is contained in:
Michaël Banaan Ananas 2014-03-11 20:10:44 +00:00
parent 4c3dd33d93
commit eb97b7e1af
1 changed files with 21 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
src/mame/audio/cps3.c
View File

@ -67,25 +67,29 @@ void cps3_sound_device::sound_stream_update(sound_stream &stream, stream_sample_
3 xxxxxxxx xxxxxxxx -------- -------- frequency
-------- -------- xxxxxxxx xxxxxxxx loop address low
4 -------- -------- xxxxxxxx xxxxxxxx loop address high
5 xxxxxxxx xxxxxxxx -------- -------- end address low
5 xxxxxxxx xxxxxxxx -------- -------- end address low (*)
-------- -------- xxxxxxxx xxxxxxxx end address high
6 xxxxxxxx xxxxxxxx -------- -------- ?
-------- -------- -------- xxxxxxxx ?
7 xxxxxxxx xxxxxxxx -------- -------- volume right
-------- -------- xxxxxxxx xxxxxxxx volume left
6 xxxxxxxx xxxxxxxx -------- -------- end address low (*)
-------- -------- xxxxxxxx xxxxxxxx end address high
7 xxxxxxxx xxxxxxxx -------- -------- volume right (signed?)
-------- -------- xxxxxxxx xxxxxxxx volume left (signed?)
(*) reg 5 and 6 are always the same. One of them probably means loop-end address,
but we won't know which until we do tests on real hw.
*/
cps3_voice *vptr = &m_voice[i];
UINT32 start = (vptr->regs[1] >> 16 & 0x0000ffff) | (vptr->regs[1] << 16 & 0xffff0000);
UINT32 end = (vptr->regs[5] >> 16 & 0x0000ffff) | (vptr->regs[5] << 16 & 0xffff0000);
UINT32 loop = (vptr->regs[3] & 0x0000ffff) | (vptr->regs[4] << 16 & 0xffff0000);
bool loop_enable = (vptr->regs[2] & 1) ? true : false;
UINT32 step = vptr->regs[3] >> 16 & 0xffff;
INT16 vol_l = (vptr->regs[7] & 0xffff);
INT16 vol_r = (vptr->regs[7] >> 16 & 0xffff);
UINT32 pos = vptr->pos;
UINT16 frac = vptr->frac;
UINT32 frac = vptr->frac;
/* TODO */
start -= 0x400000;
@ -93,21 +97,23 @@ void cps3_sound_device::sound_stream_update(sound_stream &stream, stream_sample_
loop -= 0x400000;
/* Go through the buffer and add voice contributions */
for (int j = 0; j < samples; j ++)
for (int j = 0; j < samples; j++)
{
INT32 sample;
pos += (frac >> 12);
frac &= 0xfff;
if (start + pos >= end)
if ((start + pos) >= end)
{
if (vptr->regs[2])
if (loop_enable)
{
pos = loop - start;
// loop
pos = (pos + loop) - end;
}
else
{
// key off
m_key &= ~(1 << i);
break;
}
@ -116,8 +122,8 @@ void cps3_sound_device::sound_stream_update(sound_stream &stream, stream_sample_
sample = m_base[BYTE4_XOR_LE(start + pos)];
frac += step;
outputs[0][j] += (sample * (vol_l >> 8));
outputs[1][j] += (sample * (vol_r >> 8));
outputs[0][j] += ((sample * vol_l) >> 8);
outputs[1][j] += ((sample * vol_r) >> 8);
}
vptr->pos = pos;
@ -137,6 +143,8 @@ WRITE32_MEMBER( cps3_sound_device::cps3_sound_w )
}
else if (offset == 0x80)
{
assert((mem_mask & 0xffff0000) == 0xffff0000); // doesn't happen
UINT16 key = data >> 16;
for (int i = 0; i < CPS3_VOICES; i++)