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Refactored sound code - slight speedup.

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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
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18
src/sound_pssj.c
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@ -102,11 +102,18 @@ static uint8_t pssj_read(uint16_t port, void *p)
}
}
static void pssj_update(pssj_t *pssj)
{
for (; pssj->pos < sound_pos_global; pssj->pos++)
pssj->buffer[pssj->pos] = (((int8_t)(pssj->dac_val ^ 0x80) * 0x20) * pssj->amplitude) / 15;
}
static void pssj_callback(void *p)
{
pssj_t *pssj = (pssj_t *)p;
int data;
pssj_update(pssj);
if (pssj->ctrl & 2)
{
if ((pssj->ctrl & 3) == 3)
@ -160,18 +167,13 @@ static void pssj_callback(void *p)
pssj->timer_count += (int)(TIMER_USEC * (1000000.0 / 3579545.0) * (double)(pssj->freq ? pssj->freq : 0x400));
}
static void pssj_poll(void *p)
{
pssj_t *pssj = (pssj_t *)p;
pssj->buffer[pssj->pos++] = (((int8_t)(pssj->dac_val ^ 0x80) * 0x20) * pssj->amplitude) / 15;
}
static void pssj_get_buffer(int16_t *buffer, int len, void *p)
{
pssj_t *pssj = (pssj_t *)p;
int c;
pssj_update(pssj);
for (c = 0; c < len * 2; c++)
buffer[c] += pssj->buffer[c >> 1];
@ -187,7 +189,7 @@ void *pssj_init()
io_sethandler(0x00C4, 0x0004, pssj_read, NULL, NULL, pssj_write, NULL, NULL, pssj);
timer_add(pssj_callback, &pssj->timer_count, &pssj->enable, pssj);
sound_add_handler(pssj_poll, pssj_get_buffer, pssj);
sound_add_handler(pssj_get_buffer, pssj);
return pssj;
}