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|
use crate::audio::{
Channels,
channel::{Channel, DutyCycle},
parse,
};
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ChanSpec {
PulseA,
PulseB,
Triangle,
Noise,
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Instruction {
Pause,
PauseLen(u32),
Jump(usize),
SetVolume(ChanSpec, u8),
SetPitch(ChanSpec, u8),
SetPulseDutyA(DutyCycle),
SetPulseDutyB(DutyCycle),
SetNoiseMode(bool),
}
fn map_pitch(pitch: u8) -> f32 {
const HALF_STEP: f32 = 1.059_463_1;
HALF_STEP.powf(pitch as f32 - 128.0)
}
const fn map_volume(volume: u8) -> f32 {
if volume > 100 {
1.0
} else {
(volume as f32) / 100.0
}
}
#[derive(Debug, Clone)]
pub struct Program {
ins: Vec<Instruction>,
pc: usize,
looping: bool,
pause_cnt: u32,
pause_len: u32,
}
impl Program {
pub const fn new(ins: Vec<Instruction>, looping: bool) -> Self {
let pc = ins.len();
Self {
ins,
pc,
looping,
pause_cnt: 0,
pause_len: 4,
}
}
pub fn parse(src: &str, looping: bool) -> parse::Result<Self> {
let ins = parse::parse(src)?;
Ok(Self::new(ins, looping))
}
pub fn merge(self, other: Self) -> Self {
let mut l_ins = self.ins;
let r_ins = other.ins;
let mut l = 0;
let mut r = 0;
loop {
if r >= r_ins.len() {
break;
}
let ins = r_ins[r];
if ins == Instruction::Pause {
// inc l until even
loop {
if l == l_ins.len() {
l_ins.push(Instruction::Pause);
break;
}
if l_ins[l] == Instruction::Pause {
l += 1;
break;
}
l += 1;
}
} else {
l_ins.insert(l, ins);
}
r += 1;
}
Self::new(l_ins, self.looping)
}
fn exec_ins(&mut self, channels: &mut Channels, ins: Instruction) {
use Instruction as I;
match ins {
I::Pause => {
self.pause_cnt = self.pause_len;
}
I::PauseLen(pause_len) => {
self.pause_len = pause_len;
}
I::Jump(pc) => {
self.pc = pc;
}
I::SetVolume(chan_spec, volume) => {
// set the volume (amplitude) on a given channel
use ChanSpec as C;
let v = map_volume(volume);
match chan_spec {
C::PulseA => channels.pulse_a.set_volume(v),
C::PulseB => channels.pulse_b.set_volume(v),
C::Triangle => channels.triangle.set_volume(v),
C::Noise => channels.noise.set_volume(v),
}
}
I::SetPitch(chan_spec, pitch) => {
// set the pitch (freq) on a given channel
use ChanSpec as C;
let p = map_pitch(pitch);
match chan_spec {
C::PulseA => channels.pulse_a.set_pitch(p),
C::PulseB => channels.pulse_b.set_pitch(p),
C::Triangle => channels.triangle.set_pitch(p),
C::Noise => channels.noise.set_pitch(p),
}
}
I::SetPulseDutyA(duty_cycle) => {
channels.pulse_a.set_duty(duty_cycle);
}
I::SetPulseDutyB(duty_cycle) => {
channels.pulse_b.set_duty(duty_cycle);
}
I::SetNoiseMode(mode) => {
channels.noise.set_mode(mode);
}
}
}
pub fn exec(&mut self, channels: &mut Channels) {
if self.pause_cnt > 0 {
self.pause_cnt -= 1;
}
loop {
if self.pause_cnt > 0 {
break;
}
if self.finished() {
if self.looping {
self.pc = 0;
} else {
break;
}
}
let ins = self.ins[self.pc];
self.exec_ins(channels, ins);
self.pc += 1;
}
}
pub const fn finished(&self) -> bool {
self.pc >= self.ins.len()
}
pub const fn play(&mut self) {
self.pc = 0;
}
pub const fn set_looping(&mut self, looping: bool) {
self.looping = looping;
}
}
|
