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Add OPL3_WriteRegDelayed() to buffer with a custom delay #27

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Add OPL3_WriteRegDelayed() to buffer with a custom delay #27

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29 changes: 29 additions & 0 deletions opl3.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1469,6 +1469,35 @@ void OPL3_WriteReg(opl3_chip *chip, uint16_t reg, uint8_t v)
}
}

void OPL3_WriteRegDelayed(opl3_chip *chip, uint16_t reg, uint8_t v, uint64_t delay)
{
uint64_t currentTime;
opl3_writebuf *writebuf = &chip->writebuf[chip->writebuf_last];

currentTime = chip->writebuf_lasttime;

/* If we've overflowed the ringbuffer, process the next event early */
if (writebuf->reg & 0x200)
{
OPL3_WriteReg(chip, writebuf->reg & 0x1ff, writebuf->data);
}

/* If the previous write was in the past... */
if (currentTime < chip->writebuf_samplecnt)
{
currentTime = chip->writebuf_samplecnt;
}

/* Schedule the write. */
writebuf->time = currentTime + delay;
writebuf->reg = reg | 0x200;
writebuf->data = v;

/* Advance the writebuf ringbuffer. */
chip->writebuf_last = (chip->writebuf_last + 1) % OPL_WRITEBUF_SIZE;
chip->writebuf_lasttime = writebuf->time;
}

void OPL3_WriteRegBuffered(opl3_chip *chip, uint16_t reg, uint8_t v)
{
uint64_t time1, time2;
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1 change: 1 addition & 0 deletions opl3.h
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Original file line number Diff line number Diff line change
Expand Up @@ -159,6 +159,7 @@ void OPL3_GenerateResampled(opl3_chip *chip, int16_t *buf);
void OPL3_Reset(opl3_chip *chip, uint32_t samplerate);
void OPL3_WriteReg(opl3_chip *chip, uint16_t reg, uint8_t v);
void OPL3_WriteRegBuffered(opl3_chip *chip, uint16_t reg, uint8_t v);
void OPL3_WriteRegDelayed(opl3_chip *chip, uint16_t reg, uint8_t v, uint64_t delay);
void OPL3_GenerateStream(opl3_chip *chip, int16_t *sndptr, uint32_t numsamples);

void OPL3_Generate4Ch(opl3_chip *chip, int16_t *buf4);
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