#include <stdlib.h>
#include <string.h>

//#resource "astrocade.inc"
#include "aclib.h"
//#link "aclib.s"
//#link "hdr_autostart.s"
#include "acbios.h"
//#link "acbios.s"

byte soundregs[8];

////////
//
// MUSIC ROUTINES
//

// Namespace(bias=0, freq=6480.0, length=64, maxbits=12, upper=49)
// 430.0 38.11501356252539 49
const int note_table[64] = {
  255,241,228,215,203,191,181,170,161,152,143,135,128,121,114,107,101,96,90,85,80,76,72,68,64,60,57,54,51,48,45,43,40,38,36,34,32,30,28,27,25,24,23,21,20,19,18,17,16,15,14,13,13,12,11,11,10,9,9,8,8,8,7,7,};

struct {
  byte volume;
} voice[3];

byte music_index = 0;
byte cur_duration = 0;

const byte music1[] = {
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};

static const byte* music_ptr = music1;

inline byte next_music_byte() {
  return *music_ptr++;
}

void play_music() {
  byte ch;
  byte freech = 0;
  soundregs[1] = voice[0].volume | (voice[1].volume<<4);
  soundregs[2] = voice[2].volume;
  for (ch=0; ch<3; ch++) {
    if (voice[ch].volume) {
      voice[ch].volume--;
    } else {
      freech = ch;
    }
  }
  if (music_ptr) {
    ch = freech;
    while (cur_duration == 0) {
      byte note = next_music_byte();
      if ((note & 0x80) == 0) {
        if (note >= 12) note - 12;
        soundregs[6-ch] = note_table[note & 63];
        voice[ch].volume = 15;
        ch = ch ? ch-1 : 2;
      } else {
        if (note == 0xff)
          music_ptr = 0;
        cur_duration = note & 63;
      }
    }
    cur_duration--;
    set_sound_registers(soundregs);
  }
}

void start_music(const byte* music) {
  memset(voice, 0, sizeof(voice));
  music_ptr = music;
  cur_duration == 0;
}

const byte SOUND_INIT[8] = {
  0x00, 0x00, 0x00, 0x00,
  0x00, 0x00, 0x00, 0x40,
};

void init_sound() {
  memcpy(soundregs, SOUND_INIT, 8);
  set_sound_registers(soundregs);
}

void main() {
  init_sound();
  activate_interrupts();
  while (1) {
    if (!music_ptr) start_music(music1);
    play_music();
    sleep(2);
  }
}