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Support master volume.

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This commit is contained in:
Thomas Harte
2025-11-11 21:04:07 -05:00
parent 989fb32fba
commit eac7493180
2 changed files with 18 additions and 3 deletions
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Components/SID/SID.cpp
+17 -3
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@@ -57,6 +57,10 @@ void SID::write(const Numeric::SizedInt<5> address, const uint8_t value) {
adsr().release = value;
adsr().set_phase(adsr().phase);
break;
case 0x18:
volume_ = value & 0x0f;
break;
}
});
}
@@ -91,9 +95,19 @@ void SID::apply_samples(const std::size_t number_of_samples, Outputs::Speaker::M
// TODO: apply filter.
const int16_t sample =
voices_[0].output(voices_[2]) +
voices_[1].output(voices_[0]) +
voices_[2].output(voices_[1]);
(
volume_ * (
voices_[0].output(voices_[2]) +
voices_[1].output(voices_[0]) +
voices_[2].output(voices_[1])
- 227 // DC offset.
)
- 88732
) / 3;
// Maximum range of above: 15 * (4095 * 3 - 227) = [-3405, 180870]
// So subtracting 88732 will move to the centre of the range, and 3 is the smallest
// integer that avoids clipping.
Outputs::Speaker::apply<action>(
target[c],