first pass at implementing runtime playback
This commit is contained in:
lif
parent
28fd640d28
commit
4657e649b8
370
src/main.rs
370
src/main.rs
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@ -12,6 +12,11 @@ mod halfwidth;
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use core::fmt::Write;
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use gba::prelude::*;
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use voladdress::{Safe, VolAddress};
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#[macro_use]
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extern crate build_const;
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build_const!("lsdpack_bc");
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#[allow(unused_must_use)]
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#[panic_handler]
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@ -53,18 +58,379 @@ fn panic_handler(info: &core::panic::PanicInfo) -> ! {
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static FRAME_KEYS: GbaCell<KeyInput> = GbaCell::new(KeyInput::new());
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#[link_section = ".iwram"]
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extern "C" fn irq_handler(_: IrqBits) {
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static mut LSDJ_SONGS: Lsdpack = Lsdpack::new(&LSDPACK_DATA, &LSDPACK_SONG_POSITIONS);
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#[link_section = ".iwram"]
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extern "C" fn irq_handler(bits: IrqBits) {
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if bits.vblank() {
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// We'll read the keys during vblank and store it for later.
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FRAME_KEYS.write(KEYINPUT.read());
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}
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if bits.timer0() {
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unsafe {
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LSDJ_SONGS.tick();
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}
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}
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}
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#[allow(dead_code)]
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#[repr(u8)]
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#[derive(Copy, Clone)]
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enum LsdpackCmd {
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// special commands (not just plain register writes)
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EndTick = 0,
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SampleStart = 1,
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SongStop = 2,
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NextBank = 3,
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AmpDecPu0 = 4,
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AmpDecPu1 = 5,
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AmpDecNoi = 6,
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PitchPu0 = 7,
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PitchPu1 = 8,
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PitchWav = 9,
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SampleNext = 10,
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_Invalid0B = 0x0b,
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_Invalid0C = 0x0c,
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_Invalid0D = 0x0d,
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_Invalid0E = 0x0e,
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_Invalid0F = 0x0f,
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// ch1 pulse
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Pu0Sweep = 0x10,
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Pu0LengthWave = 0x11,
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Pu0Env = 0x12,
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Pu0PitchLsb = 0x13,
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Pu0PitchMsb = 0x14,
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_Invalid15 = 0x15,
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// ch2 pulse
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Pu1LengthWave = 0x16,
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Pu1Env = 0x17,
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Pu1PitchLsb = 0x18,
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Pu1PitchMsb = 0x19,
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// ch3 wave
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WavOnOff = 0x1a,
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WavLength = 0x1b,
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WavEnv = 0x1c,
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WavPitchLsb = 0x1d,
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WavPitchMsb = 0x1e,
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_Invalid1F = 0x1f,
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// ch4 noise
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NoiLength = 0x20,
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NoiEnv = 0x21,
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NoiWave = 0x22,
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NoiTrig = 0x23,
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// general
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ChannelVolume = 0x24,
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Pan = 0x25,
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SoundOffOn = 0x26,
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_Invalid27 = 0x27,
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_Invalid28 = 0x28,
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_Invalid29 = 0x29,
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_Invalid2A = 0x2a,
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_Invalid2B = 0x2b,
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_Invalid2C = 0x2c,
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_Invalid2D = 0x2d,
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_Invalid2E = 0x2e,
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_Invalid2F = 0x2f,
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// wave pattern
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WavePattern0 = 0x30,
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WavePattern1 = 0x31,
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WavePattern2 = 0x32,
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WavePattern3 = 0x33,
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WavePattern4 = 0x34,
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WavePattern5 = 0x35,
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WavePattern6 = 0x36,
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WavePattern7 = 0x37,
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WavePattern8 = 0x38,
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WavePattern9 = 0x39,
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WavePatternA = 0x3a,
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WavePatternB = 0x3b,
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WavePatternC = 0x3c,
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WavePatternD = 0x3d,
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WavePatternE = 0x3e,
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WavePatternF = 0x3f,
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}
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impl From<u8> for LsdpackCmd {
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fn from(val: u8) -> Self {
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assert!(val <= 0x3f);
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unsafe { core::mem::transmute(val) }
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}
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}
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struct Lsdpack {
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data: &'static [u8],
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setlist: &'static [usize],
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current_ptr: usize,
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sample_ptr: usize,
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repeat_cmd: Option<LsdpackCmd>,
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repeat_cmd_counter: usize,
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sample_pitch: u16,
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stopped: bool,
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}
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impl Lsdpack {
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const fn new(data: &'static [u8], setlist: &'static [usize]) -> Self {
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Self {
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data,
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setlist,
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current_ptr: setlist[0],
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sample_ptr: 0,
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repeat_cmd: None,
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repeat_cmd_counter: 0,
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sample_pitch: 0,
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stopped: false,
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}
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}
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}
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impl Lsdpack {
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fn play_song(&mut self, song_id: usize) {
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self.current_ptr = self.setlist[song_id];
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self.sample_ptr = 0;
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self.repeat_cmd = None;
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self.repeat_cmd_counter = 0;
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self.stopped = false;
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}
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#[link_section = ".iwram"]
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fn next_byte(&mut self) -> u8 {
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let val = self.data[self.current_ptr];
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self.current_ptr += 1;
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val
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}
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#[link_section = ".iwram"]
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fn write_next_samples(&mut self) {
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let ptr = self.sample_ptr;
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self.sample_ptr += 16;
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//let sound_enabled = SOUND_ENABLED.read();
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//SOUND_ENABLED.write(sound_enabled.with_wave_playing(false));
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let lrvol = LEFT_RIGHT_VOLUME.read();
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LEFT_RIGHT_VOLUME.write(lrvol.with_wave_left(false).with_wave_right(false));
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WAVE_BANK.write(WaveBank::new().with_enabled(false));
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WAVE_RAM.index(0).write(u32::from_le_bytes(
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TryFrom::try_from(&self.data[ptr..ptr + 4]).unwrap(),
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));
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WAVE_RAM.index(1).write(u32::from_le_bytes(
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TryFrom::try_from(&self.data[ptr + 4..ptr + 8]).unwrap(),
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));
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WAVE_RAM.index(2).write(u32::from_le_bytes(
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TryFrom::try_from(&self.data[ptr + 8..ptr + 12]).unwrap(),
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));
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WAVE_RAM.index(3).write(u32::from_le_bytes(
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TryFrom::try_from(&self.data[ptr + 12..ptr + 16]).unwrap(),
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));
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WAVE_BANK.write(WaveBank::new().with_enabled(true));
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//SOUND_ENABLED.write(sound_enabled);
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LEFT_RIGHT_VOLUME.write(lrvol);
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WAVE_FREQ.write(WaveFrequency::new().with_length(self.sample_pitch));
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}
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#[link_section = ".iwram"]
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fn tick(&mut self) {
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if self.stopped {
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return;
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}
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let mut ongoing = true;
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while ongoing {
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if let Some(cmd) = self.repeat_cmd {
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if self.repeat_cmd_counter > 0 {
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self.repeat_cmd_counter -= 1;
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ongoing = self.apply_cmd(cmd);
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continue;
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} else {
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self.repeat_cmd = None;
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}
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}
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let cmd = self.load_new_cmd_from_stream();
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ongoing = self.apply_cmd(cmd);
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}
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}
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#[link_section = ".iwram"]
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fn load_new_cmd_from_stream(&mut self) -> LsdpackCmd {
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let cmd = self.next_byte();
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if cmd & 0x40 != 0 {
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self.repeat_cmd = Some((cmd & 0x3f).into());
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self.repeat_cmd_counter = self.next_byte() as usize;
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self.repeat_cmd.unwrap()
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} else {
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cmd.into()
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}
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}
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#[link_section = ".iwram"]
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fn write_lsb<T>(&mut self, voladdr: VolAddress<T, Safe, Safe>) {
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let voladdr = unsafe { voladdr.cast::<u16>() };
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voladdr.write((voladdr.read() & 0xFF00) | (self.next_byte() as u16));
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}
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#[link_section = ".iwram"]
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fn write_msb<T>(&mut self, voladdr: VolAddress<T, Safe, Safe>) {
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let voladdr = unsafe { voladdr.cast::<u16>() };
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voladdr.write((voladdr.read() & 0xFF) | ((self.next_byte() as u16) << 8));
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}
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#[link_section = ".iwram"]
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fn write_u16le<T>(&mut self, voladdr: VolAddress<T, Safe, Safe>) {
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let voladdr = unsafe { voladdr.cast::<u16>() };
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let halfword = u16::from_le_bytes([self.next_byte(), self.next_byte()]);
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voladdr.write(halfword);
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}
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#[link_section = ".iwram"]
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fn apply_cmd(&mut self, cmd: LsdpackCmd) -> bool {
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use LsdpackCmd::*;
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match cmd {
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// special commands:
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EndTick => return false,
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SampleStart => {
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let _sample_bank = self.next_byte(); // TODO?
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self.sample_ptr = u16::from_le_bytes([self.next_byte(), self.next_byte()]) as usize;
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// big endian order for the pitch here? don't know why
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self.sample_pitch = u16::from_be_bytes([self.next_byte(), self.next_byte()]);
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self.write_next_samples(); // also writes pitch
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}
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SongStop => {
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self.stopped = true;
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return false;
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}
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NextBank => { /* lol */ }
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AmpDecPu0 => {
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let base = TONE1_PATTERN.read();
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TONE1_PATTERN.write(
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base.with_volume(0)
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.with_step_increasing(true)
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.with_step_time(1),
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); // $FF12 <- $9
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TONE1_PATTERN.write(
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base.with_volume(1)
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.with_step_increasing(false)
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.with_step_time(1),
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); // $FF12 <- $11
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TONE1_PATTERN.write(
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base.with_volume(1)
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.with_step_increasing(true)
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.with_step_time(0),
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); // $FF12 <- $18
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}
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AmpDecPu1 => {
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let base = TONE2_PATTERN.read();
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TONE2_PATTERN.write(
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base.with_volume(0)
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.with_step_increasing(true)
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.with_step_time(1),
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); // $FF17 <- $9
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TONE2_PATTERN.write(
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base.with_volume(1)
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.with_step_increasing(false)
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.with_step_time(1),
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); // $FF17 <- $11
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TONE2_PATTERN.write(
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base.with_volume(1)
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.with_step_increasing(true)
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.with_step_time(0),
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); // $FF17 <- $18
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}
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AmpDecNoi => {
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let base = NOISE_LEN_ENV.read();
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NOISE_LEN_ENV.write(
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base.with_volume(0)
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.with_step_increasing(true)
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.with_step_time(1),
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); // $FF21 <- $9
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NOISE_LEN_ENV.write(
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base.with_volume(1)
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.with_step_increasing(false)
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.with_step_time(1),
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); // $FF21 <- $11
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NOISE_LEN_ENV.write(
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base.with_volume(1)
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.with_step_increasing(true)
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.with_step_time(0),
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); // $FF21 <- $18
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}
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PitchPu0 => self.write_u16le(TONE1_FREQUENCY),
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PitchPu1 => self.write_u16le(TONE2_FREQUENCY),
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PitchWav => self.write_u16le(WAVE_FREQ),
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SampleNext => self.write_next_samples(),
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// general register writes:
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Pu0Sweep => unsafe { TONE1_SWEEP.cast() }.write(self.next_byte()),
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Pu0LengthWave => self.write_lsb(TONE1_PATTERN),
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Pu0Env => self.write_msb(TONE1_PATTERN),
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Pu0PitchLsb => self.write_lsb(TONE1_FREQUENCY),
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Pu0PitchMsb => self.write_msb(TONE1_FREQUENCY),
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Pu1LengthWave => self.write_lsb(TONE2_PATTERN),
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Pu1Env => self.write_msb(TONE2_PATTERN),
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Pu1PitchLsb => self.write_lsb(TONE2_FREQUENCY),
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Pu1PitchMsb => self.write_msb(TONE2_FREQUENCY),
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WavOnOff => WAVE_BANK.write(WaveBank::new().with_enabled(self.next_byte() != 0)),
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WavLength => self.write_lsb(WAVE_LEN_VOLUME),
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WavEnv => self.write_msb(WAVE_LEN_VOLUME),
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WavPitchLsb => self.write_lsb(WAVE_FREQ),
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WavPitchMsb => self.write_msb(WAVE_FREQ),
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NoiLength => self.write_lsb(NOISE_LEN_ENV),
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NoiEnv => self.write_msb(NOISE_LEN_ENV),
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NoiWave => self.write_lsb(NOISE_FREQ),
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NoiTrig => self.write_msb(NOISE_FREQ),
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ChannelVolume => self.write_lsb(LEFT_RIGHT_VOLUME),
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Pan => self.write_msb(LEFT_RIGHT_VOLUME),
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SoundOffOn => unsafe { SOUND_ENABLED.cast() }.write(self.next_byte()),
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WavePattern0 => todo!(),
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WavePattern1 => todo!(),
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WavePattern2 => todo!(),
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WavePattern3 => todo!(),
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WavePattern4 => todo!(),
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WavePattern5 => todo!(),
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WavePattern6 => todo!(),
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WavePattern7 => todo!(),
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WavePattern8 => todo!(),
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WavePattern9 => todo!(),
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WavePatternA => todo!(),
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WavePatternB => todo!(),
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WavePatternC => todo!(),
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WavePatternD => todo!(),
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WavePatternE => todo!(),
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WavePatternF => todo!(),
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_Invalid0B | _Invalid0C | _Invalid0D | _Invalid0E | _Invalid0F | _Invalid15
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| _Invalid1F | _Invalid27 | _Invalid28 | _Invalid29 | _Invalid2A | _Invalid2B
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| _Invalid2C | _Invalid2D | _Invalid2E | _Invalid2F => unimplemented!(),
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}
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true
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}
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}
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#[no_mangle]
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extern "C" fn main() -> ! {
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RUST_IRQ_HANDLER.write(Some(irq_handler));
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DISPSTAT.write(DisplayStatus::new().with_irq_vblank(true));
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IE.write(IrqBits::VBLANK);
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IE.write(IrqBits::VBLANK.with_timer0(true));
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IME.write(true);
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TIMER0_RELOAD.write((((16777216 / 256) / 6) as u16).wrapping_neg());
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TIMER0_CONTROL.write(
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TimerControl::new()
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.with_overflow_irq(true)
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.with_cascade(false)
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.with_scale(TimerScale::_256)
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.with_enabled(true),
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);
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unsafe {
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LSDJ_SONGS.play_song(0);
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}
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if let Ok(mut logger) = MgbaBufferedLogger::try_new(MgbaMessageLevel::Debug) {
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writeln!(logger, "hello!").ok();
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