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C140 fixes and optimizations

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Minor optimization
Move output shift function to dispatch
Fix loop
Fix pan scaling if using INS_AMIGA
correct about
This commit is contained in:
cam900 2023-08-10 20:24:10 +09:00
parent 21d1dfefa1
commit 4d7d610f8c
7 changed files with 55 additions and 35 deletions
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64
src/engine/platform/sound/c140.c
View file

@ -2,9 +2,13 @@
============================================================================
Namco C140 sound emulator
MODIFIED Namco C140 sound emulator - MODIFIED VERSION
by cam900
MODIFICATION by tildearrow - adds muting function
THIS IS NOT THE ORIGINAL VERSION - you can find the original one in
commit 72d04777c013988ed8cf6da27c62a9d784a59dff
This file is licensed under zlib license.
============================================================================
@ -52,58 +56,64 @@ void c140_tick(struct c140_t *c140, const int cycle)
for (int i = 0; i < 24; i++)
{
c140_voice_tick(c140, i, cycle);
if (!c140->voice[i].muted) {
c140->lout += c140->voice[i].lout;
c140->rout += c140->voice[i].rout;
}
c140->lout += c140->voice[i].lout;
c140->rout += c140->voice[i].rout;
}
// scale as 16bit
c140->lout >>= 10;
c140->rout >>= 10;
}
void c140_voice_tick(struct c140_t *c140, const unsigned char voice, const int cycle)
void c140_voice_tick(struct c140_t *c140, const unsigned char v, const int cycle)
{
struct c140_voice_t *c140_voice = &c140->voice[voice];
if (c140_voice->busy && c140_voice->keyon)
struct c140_voice_t *voice = &c140->voice[v];
if (voice->busy && voice->keyon)
{
for (int c = 0; c < cycle; c++)
{
c140_voice->frac += c140_voice->freq;
if (c140_voice->frac > 0xffff)
voice->frac += voice->freq;
if (voice->frac > 0xffff)
{
c140_voice->addr += c140_voice->frac >> 16;
if (c140_voice->addr > c140_voice->end_addr)
voice->addr += voice->frac >> 16;
if (voice->addr > voice->end_addr)
{
if (c140_voice->loop)
if (voice->loop)
{
c140_voice->addr = (c140_voice->addr + c140_voice->end_addr) - c140_voice->loop_addr;
voice->addr = (voice->addr + voice->loop_addr) - voice->end_addr;
}
else
{
c140_voice->keyon = false;
voice->keyon = false;
voice->lout = 0;
voice->rout = 0;
return;
}
}
c140_voice->frac &= 0xffff;
voice->frac &= 0xffff;
}
}
if (!voice->muted)
{
// fetch 12 bit sample
signed short s1 = c140->sample_mem[((unsigned int)(c140_voice->bank) << 16) | c140_voice->addr] & ~0xf;
signed short s2 = c140->sample_mem[((unsigned int)(c140_voice->bank) << 16) | ((c140_voice->addr + 1) & 0xffff)] & ~0xf;
if (c140_voice->compressed)
signed short s1 = c140->sample_mem[((unsigned int)(voice->bank) << 16) | voice->addr] & ~0xf;
signed short s2 = c140->sample_mem[((unsigned int)(voice->bank) << 16) | ((voice->addr + 1) & 0xffff)] & ~0xf;
if (voice->compressed)
{
s1 = c140->mulaw[(s1 >> 8) & 0xff];
s2 = c140->mulaw[(s2 >> 8) & 0xff];
}
// interpolate
signed int sample = s1 + (((c140_voice->frac) * (s2 - s1)) >> 16);
c140_voice->lout = sample * c140_voice->lvol;
c140_voice->rout = sample * c140_voice->rvol;
signed int sample = s1 + (((voice->frac) * (s2 - s1)) >> 16);
voice->lout = sample * voice->lvol;
voice->rout = sample * voice->rvol;
}
else
{
voice->lout = 0;
voice->rout = 0;
}
}
else
{
c140_voice->lout = 0;
c140_voice->rout = 0;
voice->lout = 0;
voice->rout = 0;
}
}

2
src/engine/platform/sound/c140.h
View file

@ -79,7 +79,7 @@ struct c140_t
void c140_tick(struct c140_t *c140, const int cycle);
void c140_voice_tick(struct c140_t *c140, const unsigned char voice, const int cycle);
void c140_voice_tick(struct c140_t *c140, const unsigned char v, const int cycle);
void c140_keyon(struct c140_voice_t *c140_voice);