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SPU: Fix ADSR

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It was waiting for 1 cycle too long each time, and I'd managed to get my
bit manipulation all jumbled up.
This commit is contained in:
Ziemas 2021-01-20 09:12:35 +01:00
parent 4afb31fc64
commit a6c2a40c21
1 changed files with 3 additions and 3 deletions
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6
src/core/iop/spu/spu_envelope.cpp
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@ -5,7 +5,7 @@
int16_t Envelope::next_step(int16_t volume)
{
if (cycles_left > 0)
if (cycles_left > 1)
{
cycles_left--;
return 0;
@ -43,7 +43,7 @@ void ADSR::set_stage(ADSR::Stage new_stage)
envelope.negative_phase = false;
envelope.rising = true;
envelope.shift = (adsr1 >> 10) & 0x1f;
envelope.step = (adsr2 >> 8) & 0x03;
envelope.step = (adsr1 >> 8) & 0x03;
envelope.step = envelope.rising ? (7 - envelope.step) : (-8 + envelope.step);
stage = new_stage;
break;
@ -52,7 +52,7 @@ void ADSR::set_stage(ADSR::Stage new_stage)
envelope.negative_phase = false;
envelope.exponential = true;
envelope.rising = false;
envelope.shift = (adsr1 >> 4) & 0x1f;
envelope.shift = (adsr1 >> 4) & 0xf;
envelope.step = -8;
stage = new_stage;
break;