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fix(apu): implement NR50 volume controls

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
View File

@ -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
}

18
src/apu/types.rs
View File

@ -503,10 +503,20 @@ impl From<SoundOutput> for u8 {
bitfield! {
pub struct ChannelControl(u8);
impl Debug;
vin_so2, _: 7;
so2_level, _: 6, 4;
vin_so1, _: 3;
so1_level, _: 2, 0;
vin_left, _: 7;
_left_volume, _: 6, 4;
vin_right, _: 3;
_right_volume, _: 2, 0;
}
impl ChannelControl {
pub(crate) fn left_volume(&self) -> f32 {
self._left_volume() as f32
}
pub(crate) fn right_volume(&self) -> f32 {
self._right_volume() as f32
}
}
impl Copy for ChannelControl {}