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break up lead update so lead data is only fetched once

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This commit is contained in:
Joachim Fenkes 2012-08-11 15:03:40 +02:00
parent fab67dc800
commit 3504f5d826
1 changed files with 8 additions and 4 deletions
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12
win/main.cpp
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@ -102,15 +102,19 @@ static unsigned char voice_lead(unsigned long i, int voice_nr)
boosts &= ~(1 << voice_nr); boosts &= ~(1 << voice_nr);
if (0 == (i & 0x1FF)) if (0 == (i & 0x1FF))
leadtimer--; leadtimer--;
if (0 == leadtimer)
leadptr++;
uint8_t data = leaddata[(leadseq[leadptr >> 4] << 4) | (leadptr & 0xF)];
if (0 == leadtimer) if (0 == leadtimer)
{ {
leadptr++; leadtimer = leadtimes[data >> 5];
leadtimer = leadtimes[leaddata[(leadseq[leadptr >> 4] << 4) | (leadptr & 0xF)] >> 5];
boosts |= 1 << voice_nr; boosts |= 1 << voice_nr;
} }
uint8_t melody = data & 0x1F;
uint8_t melody = leaddata[(leadseq[leadptr >> 4] << 4) | (leadptr & 0xF)] & 0x1F;
lead_osc += notes[melody]; lead_osc += notes[melody];
uint8_t sample = ((lead_osc >> 6) & 0x7F) + ((lead_osc >> 6) & 0x3F); uint8_t sample = ((lead_osc >> 6) & 0x7F) + ((lead_osc >> 6) & 0x3F);
return (0 == melody) ? 0 : ((boosts & (1 << voice_nr)) ? sample : THREEQUARTERS(sample)); return (0 == melody) ? 0 : ((boosts & (1 << voice_nr)) ? sample : THREEQUARTERS(sample));