// Steady On Tim, It's Only A Budget Game
// by Gasman / Hooy-Program
// ported to MicroW8 by exoticorn/icebird

include "../include/microw8-api.cwa"

fn melody(t: i32, T: i32) -> i32 {
    let lazy riff_pos = select(T & 16, (T&31) - 16, 16 - (T&31));
    let lazy shift = ((1-((T>>5)&3))%2-1) as f32 / 6 as f32;

    let inline note_count = select(T>>9, 4, 5);
    let inline octave = (riff_pos/5) as f32;
    let inline riff_note = 5514 >> (riff_pos % note_count * 4) & 15;
    let inline melody_freq = pow(2 as f32, shift + octave - ((riff_note as f32) / 12 as f32));
    let inline melody = (t as f32 * melody_freq) as i32 & 128;
    
    let inline arp_note = ((0x85>>((t>>12)%3*4)) & 15) - 1;
    let inline arp_freq = pow(2 as f32, shift + (arp_note as f32 / 12 as f32));
    let inline arp_vol = (T >= 256) * (12-T%12);
    let inline arpeggio = ((t as f32 * arp_freq) as i32 & 128) * arp_vol / 12;
    
    melody + arpeggio
}

export fn snd(t: i32) -> f32 {
    let lazy T = t/10000;
    
    let inline mel_arp = melody(t, T)/3 + melody(t, T-3)/5;

    let inline bass_vol = (T >= 128) & (197 >> (T % 8));
    let inline bass_freq = pow(2 as f32, (((T & 4) * ((T & 7) - 1)) as f32 / 24 as f32 - 5 as f32));
    let inline bass = ((t as f32 * bass_freq) as i32 & 63) * bass_vol;

    let inline snare_ish = (random() & 31) * (8 - (T + 4) % 8) / 8;

    let inline sample = mel_arp + bass + snare_ish;
    (sample & 255) as f32 / 255 as f32
}