/*
Demonstrates playing multi-voice music on the SN76489A PSG
using the CVLib functions.

Similar to the music example in "Making Arcade Games in C".
*/

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

typedef unsigned char byte;
typedef unsigned short word;

//
// MUSIC ROUTINES
//

void music_start(const byte* music);
void music_update();

// Namespace(bias=0, freq=1789772.5, length=64, maxbits=15.0, upper=49)
// 437.0 459.515928524 49
const int note_table[64] = {
17356, 32764, 30926, 29190, 27551, 26005, 24546, 23168, 21868, 20640, 19482, 18388, 17356, 32765, 30926, 29190, 27552, 26005, 24546, 23168, 21868, 20640, 19482, 18389, 17357, 16382, 15463, 14595, 13776, 13003, 12273, 11584, 10934, 10320, 9741, 9194, 8678, 8191, 7731, 7298, 6888, 6501, 6136, 5792, 5467, 5160, 4871, 4597, 4339, 4096, 3866, 3649, 3444, 3251, 3068, 2896, 2733, 2580, 2435, 2299, 2170, 2048, 1933, 1824, };

struct {
  byte volume;
} voice[3];

byte music_index = 0;
byte cur_duration = 0;
byte num_voices = 3;

static const byte* music_ptr = NULL;

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

void music_update() {
  byte ch;
  byte freech = 0;
  for (ch=0; ch<num_voices; ch++) {
    if (voice[ch].volume) {
      cv_set_attenuation(CV_SOUNDCHANNEL_0+ch*2, 32-voice[ch].volume--);
    } else {
      freech = ch;
    }
  }
  if (music_ptr) {
    ch = freech;
    while (cur_duration == 0) {
      byte note = next_music_byte();
      if ((note & 0x80) == 0) {
        int period = note_table[note & 63];
        cv_set_attenuation(CV_SOUNDCHANNEL_0+ch*2, 32);
        cv_set_frequency(CV_SOUNDCHANNEL_0+ch*2, period);
        voice[ch].volume = 31;
        ch = ch ? ch-1 : num_voices-1;
      } else {
        if (note == 0xff)
          music_ptr = NULL;
        cur_duration = note & 63;
      }
    }
    cur_duration--;
  }
}

void music_start(const byte* music) __critical {
  music_ptr = music;
  cur_duration == 0;
}

///
/// MUSIC TEST
///

#ifdef __MAIN__

const byte music1[] = {
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};

void vint_handler(void) {
  cv_set_colors(CV_COLOR_BLACK, CV_COLOR_BLUE);
  music_update();
  cv_set_colors(CV_COLOR_BLACK, CV_COLOR_BLACK);
}

void main(void) {
  cv_set_vint_handler(vint_handler);
  cv_set_screen_active(true);
  while (1) {
    if (!music_ptr) music_start(music1);
  }
}

#endif