Retro/pcem
Watch
1
0
Fork
You've already forked pcem
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Refactored sound code - slight speedup.

Browse source
This commit is contained in:
TomW 2016-02-10 20:49:28 +00:00
commit 3a57341837
33 changed files with 706 additions and 535 deletions
Download patch file Download diff file Expand all files Collapse all files

94
src/sound_cms.c
View file

@ -26,65 +26,62 @@ typedef struct cms_t
int pos;
} cms_t;
void cms_poll(void *p)
void cms_update(cms_t *cms)
{
cms_t *cms = (cms_t *)p;
int c, d;
int16_t out_l = 0, out_r = 0;
if (cms->pos >= SOUNDBUFLEN)
return;
for (c = 0; c < 4; c++)
for (; cms->pos < sound_pos_global; cms->pos++)
{
switch (cms->noisetype[c >> 1][c & 1])
int c, d;
int16_t out_l = 0, out_r = 0;
for (c = 0; c < 4; c++)
{
case 0: cms->noisefreq[c >> 1][c & 1] = 31250; break;
case 1: cms->noisefreq[c >> 1][c & 1] = 15625; break;
case 2: cms->noisefreq[c >> 1][c & 1] = 7812; break;
case 3: cms->noisefreq[c >> 1][c & 1] = cms->freq[c >> 1][(c & 1) * 3]; break;
}
}
for (c = 0; c < 2; c ++)
{
if (cms->regs[c][0x1C] & 1)
{
for (d = 0; d < 6; d++)
switch (cms->noisetype[c >> 1][c & 1])
{
if (cms->regs[c][0x14] & (1 << d))
case 0: cms->noisefreq[c >> 1][c & 1] = 31250; break;
case 1: cms->noisefreq[c >> 1][c & 1] = 15625; break;
case 2: cms->noisefreq[c >> 1][c & 1] = 7812; break;
case 3: cms->noisefreq[c >> 1][c & 1] = cms->freq[c >> 1][(c & 1) * 3]; break;
}
}
for (c = 0; c < 2; c ++)
{
if (cms->regs[c][0x1C] & 1)
{
for (d = 0; d < 6; d++)
{
if (cms->stat[c][d]) out_l += (cms->vol[c][d][0] * 90);
if (cms->stat[c][d]) out_r += (cms->vol[c][d][1] * 90);
cms->count[c][d] += cms->freq[c][d];
if (cms->count[c][d] >= 24000)
if (cms->regs[c][0x14] & (1 << d))
{
cms->count[c][d] -= 24000;
cms->stat[c][d] ^= 1;
if (cms->stat[c][d]) out_l += (cms->vol[c][d][0] * 90);
if (cms->stat[c][d]) out_r += (cms->vol[c][d][1] * 90);
cms->count[c][d] += cms->freq[c][d];
if (cms->count[c][d] >= 24000)
{
cms->count[c][d] -= 24000;
cms->stat[c][d] ^= 1;
}
}
else if (cms->regs[c][0x15] & (1 << d))
{
if (cms->noise[c][d / 3] & 1) out_l += (cms->vol[c][d][0] * 90);
if (cms->noise[c][d / 3] & 1) out_r += (cms->vol[c][d][0] * 90);
}
}
else if (cms->regs[c][0x15] & (1 << d))
for (d = 0; d < 2; d++)
{
if (cms->noise[c][d / 3] & 1) out_l += (cms->vol[c][d][0] * 90);
if (cms->noise[c][d / 3] & 1) out_r += (cms->vol[c][d][0] * 90);
}
}
for (d = 0; d < 2; d++)
{
cms->noisecount[c][d] += cms->noisefreq[c][d];
while (cms->noisecount[c][d] >= 24000)
{
cms->noisecount[c][d] -= 24000;
cms->noise[c][d] <<= 1;
if (!(((cms->noise[c][d] & 0x4000) >> 8) ^ (cms->noise[c][d] & 0x40)))
cms->noise[c][d] |= 1;
cms->noisecount[c][d] += cms->noisefreq[c][d];
while (cms->noisecount[c][d] >= 24000)
{
cms->noisecount[c][d] -= 24000;
cms->noise[c][d] <<= 1;
if (!(((cms->noise[c][d] & 0x4000) >> 8) ^ (cms->noise[c][d] & 0x40)))
cms->noise[c][d] |= 1;
}
}
}
}
cms->buffer[(cms->pos << 1)] = out_l;
cms->buffer[(cms->pos << 1) + 1] = out_r;
}
cms->buffer[(cms->pos << 1)] = out_l;
cms->buffer[(cms->pos << 1) + 1] = out_r;
cms->pos++;
}
void cms_get_buffer(int16_t *buffer, int len, void *p)
@ -93,6 +90,8 @@ void cms_get_buffer(int16_t *buffer, int len, void *p)
int c;
cms_update(cms);
for (c = 0; c < len * 2; c++)
buffer[c] += cms->buffer[c];
@ -111,6 +110,7 @@ void cms_write(uint16_t addr, uint8_t val, void *p)
cms->addrs[chip] = val & 31;
else
{
cms_update(cms);
cms->regs[chip][cms->addrs[chip] & 31] = val;
switch (cms->addrs[chip] & 31)
{
@ -159,7 +159,7 @@ void *cms_init()
pclog("cms_init\n");
io_sethandler(0x0220, 0x0004, cms_read, NULL, NULL, cms_write, NULL, NULL, cms);
sound_add_handler(cms_poll, cms_get_buffer, cms);
sound_add_handler(cms_get_buffer, cms);
return cms;
}