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fix(apu): implement NR50 volume controls

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This commit is contained in:
Rekai Nyangadzayi Musuka
2021-08-03 19:33:27 -05:00
parent de0d147685
commit d4407cf849
2 changed files with 21 additions and 7 deletions
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10
src/apu.rs
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@@ -154,8 +154,11 @@ impl Apu {
let ch4_left = self.ctrl.output.ch4_left() as u8 as f32 * ch4_amplitude;
let ch4_right = self.ctrl.output.ch4_right() as u8 as f32 * ch4_amplitude;
let left = (ch1_left + ch2_left + ch3_left + ch4_left) / 4.0;
let right = (ch1_right + ch2_right + ch3_right + ch4_right) / 4.0;
let left_mixed = (ch1_left + ch2_left + ch3_left + ch4_left) / 4.0;
let right_mixed = (ch1_right + ch2_right + ch3_right + ch4_right) / 4.0;
let left = (self.ctrl.channel.left_volume() + 1.0) * left_mixed;
let right = (self.ctrl.channel.right_volume() + 1.0) * right_mixed;
prod.push(left)
.and(prod.push(right))
@@ -742,7 +745,8 @@ impl Channel3 {
}
fn amplitude(&self) -> f32 {
let dac_input = self.read_sample(self.offset) >> self.volume.shift_count();
let dac_input =
(self.read_sample(self.offset) >> self.volume.shift_count()) * self.enabled as u8;
(dac_input as f32 / 7.5) - 1.0
}