sfxr.js

var SOUND_VOL = 0.25;
var SAMPLE_RATE = 5512;
var BIT_DEPTH = 8;

var SQUARE = 0;
var SAWTOOTH = 1;
var SINE = 2;
var NOISE = 3;
var TRIANGLE = 4;
var BREAKER = 5;

var SHAPES = [
  'square', 'sawtooth', 'sine', 'noise', 'triangle', 'breaker'
];

var AUDIO_CONTEXT;

if (typeof AudioContext != 'undefined') {
  AUDIO_CONTEXT = new AudioContext();
} else if (typeof webkitAudioContext != 'undefined') {
  AUDIO_CONTEXT = new webkitAudioContext();
}

// Playback volume
var masterVolume = 1.0;

// Sound generation parameters are on [0,1] unless noted SIGNED, & thus [-1,1]
function Params() {
  var result={};
  // Wave shape
  result.wave_type = SQUARE;

  // Envelope
  result.p_env_attack = 0.0;   // Attack time
  result.p_env_sustain = 0.3;  // Sustain time
  result.p_env_punch = 0.0;    // Sustain punch
  result.p_env_decay = 0.4;    // Decay time

  // Tone
  result.p_base_freq = 0.3;    // Start frequency
  result.p_freq_limit = 0.0;   // Min frequency cutoff
  result.p_freq_ramp = 0.0;    // Slide (SIGNED)
  result.p_freq_dramp = 0.0;   // Delta slide (SIGNED)
  // Vibrato
  result.p_vib_strength = 0.0; // Vibrato depth
  result.p_vib_speed = 0.0;    // Vibrato speed

  // Tonal change
  result.p_arp_mod = 0.0;      // Change amount (SIGNED)
  result.p_arp_speed = 0.0;    // Change speed

  // Duty (wat's that?)
  result.p_duty = 0.0;         // Square duty
  result.p_duty_ramp = 0.0;    // Duty sweep (SIGNED)

  // Repeat
  result.p_repeat_speed = 0.0; // Repeat speed

  // Phaser
  result.p_pha_offset = 0.0;   // Phaser offset (SIGNED)
  result.p_pha_ramp = 0.0;     // Phaser sweep (SIGNED)

  // Low-pass filter
  result.p_lpf_freq = 1.0;     // Low-pass filter cutoff
  result.p_lpf_ramp = 0.0;     // Low-pass filter cutoff sweep (SIGNED)
  result.p_lpf_resonance = 0.0;// Low-pass filter resonance
  // High-pass filter
  result.p_hpf_freq = 0.0;     // High-pass filter cutoff
  result.p_hpf_ramp = 0.0;     // High-pass filter cutoff sweep (SIGNED)

  // Sample parameters
  result.sound_vol = 0.5;
  result.sample_rate = 44100;
  result.bit_depth = 8;
  return result;
}

var rng;
var seeded = false;
function frnd(range) {
  if (seeded) {
    return rng.uniform() * range;
  } else {
    return Math.random() * range;
  }
}


function rnd(max) {
  if (seeded) {
  return Math.floor(rng.uniform() * (max + 1));
  } else {
    return Math.floor(Math.random() * (max + 1));
  }
}


pickupCoin = function() {
  var result=Params();
  result.wave_type = Math.floor(frnd(SHAPES.length));
  if (result.wave_type === 3) {
    result.wave_type = 0;
  }
  result.p_base_freq = 0.4 + frnd(0.5);
  result.p_env_attack = 0.0;
  result.p_env_sustain = frnd(0.1);
  result.p_env_decay = 0.1 + frnd(0.4);
  result.p_env_punch = 0.3 + frnd(0.3);
  if (rnd(1)) {
    result.p_arp_speed = 0.5 + frnd(0.2);
    var num = (frnd(7) | 1) + 1;
    var den = num + (frnd(7) | 1) + 2;
    result.p_arp_mod = (+num) / (+den); //0.2 + frnd(0.4);
  }
  return result;
};


laserShoot = function() {
  var result=Params();
  result.wave_type = rnd(2);
  if (result.wave_type === SINE && rnd(1))
    result.wave_type = rnd(1);
  result.wave_type = Math.floor(frnd(SHAPES.length));

  if (result.wave_type === 3) {
    result.wave_type = SQUARE;
  }

  result.p_base_freq = 0.5 + frnd(0.5);
  result.p_freq_limit = result.p_base_freq - 0.2 - frnd(0.6);
  if (result.p_freq_limit < 0.2) result.p_freq_limit = 0.2;
  result.p_freq_ramp = -0.15 - frnd(0.2);
  if (rnd(2) === 0)
  {
    result.p_base_freq = 0.3 + frnd(0.6);
    result.p_freq_limit = frnd(0.1);
    result.p_freq_ramp = -0.35 - frnd(0.3);
  }
  if (rnd(1))
  {
    result.p_duty = frnd(0.5);
    result.p_duty_ramp = frnd(0.2);
  }
  else
  {
    result.p_duty = 0.4 + frnd(0.5);
    result.p_duty_ramp = -frnd(0.7);
  }
  result.p_env_attack = 0.0;
  result.p_env_sustain = 0.1 + frnd(0.2);
  result.p_env_decay = frnd(0.4);
  if (rnd(1))
    result.p_env_punch = frnd(0.3);
  if (rnd(2) === 0)
  {
    result.p_pha_offset = frnd(0.2);
    result.p_pha_ramp = -frnd(0.2);
  }
  if (rnd(1))
    result.p_hpf_freq = frnd(0.3);

  return result;
};

explosion = function() {
  var result=Params();

  if (rnd(1)) {
    result.p_base_freq = 0.1 + frnd(0.4);
    result.p_freq_ramp = -0.1 + frnd(0.4);
  } else {
    result.p_base_freq = 0.2 + frnd(0.7);
    result.p_freq_ramp = -0.2 - frnd(0.2);
  }
  result.p_base_freq *= result.p_base_freq;
  if (rnd(4) === 0)
    result.p_freq_ramp = 0.0;
  if (rnd(2) === 0)
    result.p_repeat_speed = 0.3 + frnd(0.5);
  result.p_env_attack = 0.0;
  result.p_env_sustain = 0.1 + frnd(0.3);
  result.p_env_decay = frnd(0.5);
  if (rnd(1) === 0) {
    result.p_pha_offset = -0.3 + frnd(0.9);
    result.p_pha_ramp = -frnd(0.3);
  }
  result.p_env_punch = 0.2 + frnd(0.6);
  if (rnd(1)) {
    result.p_vib_strength = frnd(0.7);
    result.p_vib_speed = frnd(0.6);
  }
  if (rnd(2) === 0) {
    result.p_arp_speed = 0.6 + frnd(0.3);
    result.p_arp_mod = 0.8 - frnd(1.6);
  }

  return result;
};
//9675111
birdSound = function() {
  var result=Params();

if (frnd(10) < 1) {
    result.wave_type = Math.floor(frnd(SHAPES.length));
    if (result.wave_type === 3) {
      result.wave_type = SQUARE;
    }
result.p_env_attack = 0.4304400932967592 + frnd(0.2) - 0.1;
result.p_env_sustain = 0.15739346034252394 + frnd(0.2) - 0.1;
result.p_env_punch = 0.004488201744871758 + frnd(0.2) - 0.1;
result.p_env_decay = 0.07478075528212291 + frnd(0.2) - 0.1;
result.p_base_freq = 0.9865265720147687 + frnd(0.2) - 0.1;
result.p_freq_limit = 0 + frnd(0.2) - 0.1;
result.p_freq_ramp = -0.2995018224359539 + frnd(0.2) - 0.1;
if (frnd(1.0) < 0.5) {
  result.p_freq_ramp = 0.1 + frnd(0.15);
}
result.p_freq_dramp = 0.004598608156964473 + frnd(0.1) - 0.05;
result.p_vib_strength = -0.2202799497929496 + frnd(0.2) - 0.1;
result.p_vib_speed = 0.8084998703158364 + frnd(0.2) - 0.1;
result.p_arp_mod = 0;//-0.46410459213693644+frnd(0.2)-0.1;
result.p_arp_speed = 0;//-0.10955361249587248+frnd(0.2)-0.1;
result.p_duty = -0.9031808754347107 + frnd(0.2) - 0.1;
result.p_duty_ramp = -0.8128699999808343 + frnd(0.2) - 0.1;
result.p_repeat_speed = 0.6014860189319991 + frnd(0.2) - 0.1;
result.p_pha_offset = -0.9424902314367765 + frnd(0.2) - 0.1;
result.p_pha_ramp = -0.1055482222272056 + frnd(0.2) - 0.1;
result.p_lpf_freq = 0.9989765717851521 + frnd(0.2) - 0.1;
result.p_lpf_ramp = -0.25051720626043017 + frnd(0.2) - 0.1;
result.p_lpf_resonance = 0.32777871505494693 + frnd(0.2) - 0.1;
result.p_hpf_freq = 0.0023548750981756753 + frnd(0.2) - 0.1;
result.p_hpf_ramp = -0.002375673204842568 + frnd(0.2) - 0.1;
return result;
}

if (frnd(10) < 1) {
    result.wave_type = Math.floor(frnd(SHAPES.length));
    if (result.wave_type === 3) {
      result.wave_type = SQUARE;
    }
result.p_env_attack = 0.5277795946672003 + frnd(0.2) - 0.1;
result.p_env_sustain = 0.18243733568468432 + frnd(0.2) - 0.1;
result.p_env_punch = -0.020159754546840117 + frnd(0.2) - 0.1;
result.p_env_decay = 0.1561353422051903 + frnd(0.2) - 0.1;
result.p_base_freq = 0.9028855606533718 + frnd(0.2) - 0.1;
result.p_freq_limit = -0.008842787837148716;
result.p_freq_ramp = -0.1;
result.p_freq_dramp = -0.012891241489551925;
result.p_vib_strength = -0.17923136138403065 + frnd(0.2) - 0.1;
result.p_vib_speed = 0.908263385610142 + frnd(0.2) - 0.1;
result.p_arp_mod = 0.41690153355414894 + frnd(0.2) - 0.1;
result.p_arp_speed = 0.0010766233195860703 + frnd(0.2) - 0.1;
result.p_duty = -0.8735363011184684 + frnd(0.2) - 0.1;
result.p_duty_ramp = -0.7397985366747507 + frnd(0.2) - 0.1;
result.p_repeat_speed = 0.0591789344172107 + frnd(0.2) - 0.1;
result.p_pha_offset = -0.9961184222777699 + frnd(0.2) - 0.1;
result.p_pha_ramp = -0.08234769395850523 + frnd(0.2) - 0.1;
result.p_lpf_freq = 0.9412475115697335 + frnd(0.2) - 0.1;
result.p_lpf_ramp = -0.18261358925834958 + frnd(0.2) - 0.1;
result.p_lpf_resonance = 0.24541438107389477 + frnd(0.2) - 0.1;
result.p_hpf_freq = -0.01831940280978611 + frnd(0.2) - 0.1;
result.p_hpf_ramp = -0.03857383633171346 + frnd(0.2) - 0.1;
return result;

}
  if (frnd(10) < 1) {
//result.wave_type = 4;
    result.wave_type = Math.floor(frnd(SHAPES.length));

    if (result.wave_type === 3) {
      result.wave_type = SQUARE;
    }
result.p_env_attack = 0.4304400932967592 + frnd(0.2) - 0.1;
result.p_env_sustain = 0.15739346034252394 + frnd(0.2) - 0.1;
result.p_env_punch = 0.004488201744871758 + frnd(0.2) - 0.1;
result.p_env_decay = 0.07478075528212291 + frnd(0.2) - 0.1;
result.p_base_freq = 0.9865265720147687 + frnd(0.2) - 0.1;
result.p_freq_limit = 0 + frnd(0.2) - 0.1;
result.p_freq_ramp = -0.2995018224359539 + frnd(0.2) - 0.1;
result.p_freq_dramp = 0.004598608156964473 + frnd(0.2) - 0.1;
result.p_vib_strength = -0.2202799497929496 + frnd(0.2) - 0.1;
result.p_vib_speed = 0.8084998703158364 + frnd(0.2) - 0.1;
result.p_arp_mod = -0.46410459213693644 + frnd(0.2) - 0.1;
result.p_arp_speed = -0.10955361249587248 + frnd(0.2) - 0.1;
result.p_duty = -0.9031808754347107 + frnd(0.2) - 0.1;
result.p_duty_ramp = -0.8128699999808343 + frnd(0.2) - 0.1;
result.p_repeat_speed = 0.7014860189319991 + frnd(0.2) - 0.1;
result.p_pha_offset = -0.9424902314367765 + frnd(0.2) - 0.1;
result.p_pha_ramp = -0.1055482222272056 + frnd(0.2) - 0.1;
result.p_lpf_freq = 0.9989765717851521 + frnd(0.2) - 0.1;
result.p_lpf_ramp = -0.25051720626043017 + frnd(0.2) - 0.1;
result.p_lpf_resonance = 0.32777871505494693 + frnd(0.2) - 0.1;
result.p_hpf_freq = 0.0023548750981756753 + frnd(0.2) - 0.1;
result.p_hpf_ramp = -0.002375673204842568 + frnd(0.2) - 0.1;
return result;
}
  if (frnd(5) > 1) {
    result.wave_type = Math.floor(frnd(SHAPES.length));

    if (result.wave_type === 3) {
      result.wave_type = SQUARE;
    }
    if (rnd(1)) {
      result.p_arp_mod = 0.2697849293151393 + frnd(0.2) - 0.1;
      result.p_arp_speed = -0.3131172257760948 + frnd(0.2) - 0.1;
      result.p_base_freq = 0.8090588299313949 + frnd(0.2) - 0.1;
      result.p_duty = -0.6210022920964955 + frnd(0.2) - 0.1;
      result.p_duty_ramp = -0.00043441813553182567 + frnd(0.2) - 0.1;
      result.p_env_attack = 0.004321877246874195 + frnd(0.2) - 0.1;
      result.p_env_decay = 0.1 + frnd(0.2) - 0.1;
      result.p_env_punch = 0.061737781504416146 + frnd(0.2) - 0.1;
      result.p_env_sustain = 0.4987252564798832 + frnd(0.2) - 0.1;
      result.p_freq_dramp = 0.31700340314222614 + frnd(0.2) - 0.1;
      result.p_freq_limit = 0 + frnd(0.2) - 0.1;
      result.p_freq_ramp = -0.163380391341416 + frnd(0.2) - 0.1;
      result.p_hpf_freq = 0.4709005021145149 + frnd(0.2) - 0.1;
      result.p_hpf_ramp = 0.6924667290539194 + frnd(0.2) - 0.1;
      result.p_lpf_freq = 0.8351398631384511 + frnd(0.2) - 0.1;
      result.p_lpf_ramp = 0.36616557192873134 + frnd(0.2) - 0.1;
      result.p_lpf_resonance = -0.08685777111664439 + frnd(0.2) - 0.1;
      result.p_pha_offset = -0.036084571580025544 + frnd(0.2) - 0.1;
      result.p_pha_ramp = -0.014806445085568108 + frnd(0.2) - 0.1;
      result.p_repeat_speed = -0.8094368475518489 + frnd(0.2) - 0.1;
      result.p_vib_speed = 0.4496665457171294 + frnd(0.2) - 0.1;
      result.p_vib_strength = 0.23413762515532424 + frnd(0.2) - 0.1;
    } else {
      result.p_arp_mod = -0.35697118026766184 + frnd(0.2) - 0.1;
      result.p_arp_speed = 0.3581140690559588 + frnd(0.2) - 0.1;
      result.p_base_freq = 1.3260897696157528 + frnd(0.2) - 0.1;
      result.p_duty = -0.30984900436710694 + frnd(0.2) - 0.1;
      result.p_duty_ramp = -0.0014374759133411626 + frnd(0.2) - 0.1;
      result.p_env_attack = 0.3160357835682254 + frnd(0.2) - 0.1;
      result.p_env_decay = 0.1 + frnd(0.2) - 0.1;
      result.p_env_punch = 0.24323114016870148 + frnd(0.2) - 0.1;
      result.p_env_sustain = 0.4 + frnd(0.2) - 0.1;
      result.p_freq_dramp = 0.2866475886237244 + frnd(0.2) - 0.1;
      result.p_freq_limit = 0 + frnd(0.2) - 0.1;
      result.p_freq_ramp = -0.10956352368742976 + frnd(0.2) - 0.1;
      result.p_hpf_freq = 0.20772718017889846 + frnd(0.2) - 0.1;
      result.p_hpf_ramp = 0.1564090637378835 + frnd(0.2) - 0.1;
      result.p_lpf_freq = 0.6021372770637031 + frnd(0.2) - 0.1;
      result.p_lpf_ramp = 0.24016227139979027 + frnd(0.2) - 0.1;
      result.p_lpf_resonance = -0.08787383821160144 + frnd(0.2) - 0.1;
      result.p_pha_offset = -0.381597686151701 + frnd(0.2) - 0.1;
      result.p_pha_ramp = -0.0002481687661373495 + frnd(0.2) - 0.1;
      result.p_repeat_speed = 0.07812112809425686 + frnd(0.2) - 0.1;
      result.p_vib_speed = -0.13648848579133943 + frnd(0.2) - 0.1;
      result.p_vib_strength = 0.0018874158972302657 + frnd(0.2) - 0.1;
    }
    return result;

  }

  result.wave_type = Math.floor(frnd(SHAPES.length));//TRIANGLE;
  if (result.wave_type === 1 || result.wave_type === 3) {
    result.wave_type = 2;
  }
  //new
  result.p_base_freq = 0.85 + frnd(0.15);
  result.p_freq_ramp = 0.3 + frnd(0.15);
//  result.p_freq_dramp = 0.3+frnd(2.0);

  result.p_env_attack = 0 + frnd(0.09);
  result.p_env_sustain = 0.2 + frnd(0.3);
  result.p_env_decay = 0 + frnd(0.1);

  result.p_duty = frnd(2.0) - 1.0;
  result.p_duty_ramp = Math.pow(frnd(2.0) - 1.0, 3.0);


  result.p_repeat_speed = 0.5 + frnd(0.1);

  result.p_pha_offset = -0.3 + frnd(0.9);
  result.p_pha_ramp = -frnd(0.3);

  result.p_arp_speed = 0.4 + frnd(0.6);
  result.p_arp_mod = 0.8 + frnd(0.1);


  result.p_lpf_resonance = frnd(2.0) - 1.0;
  result.p_lpf_freq = 1.0 - Math.pow(frnd(1.0), 3.0);
  result.p_lpf_ramp = Math.pow(frnd(2.0) - 1.0, 3.0);
  if (result.p_lpf_freq < 0.1 && result.p_lpf_ramp < -0.05)
    result.p_lpf_ramp = -result.p_lpf_ramp;
  result.p_hpf_freq = Math.pow(frnd(1.0), 5.0);
  result.p_hpf_ramp = Math.pow(frnd(2.0) - 1.0, 5.0);

  return result;
};


pushSound = function() {
  var result=Params();
  result.wave_type = Math.floor(frnd(SHAPES.length));//TRIANGLE;
  if (result.wave_type === 2) {
    result.wave_type++;
  }
  if (result.wave_type === 0) {
    result.wave_type = NOISE;
  }
  //new
  result.p_base_freq = 0.1 + frnd(0.4);
  result.p_freq_ramp = 0.05 + frnd(0.2);

  result.p_env_attack = 0.01 + frnd(0.09);
  result.p_env_sustain = 0.01 + frnd(0.09);
  result.p_env_decay = 0.01 + frnd(0.09);

  result.p_repeat_speed = 0.3 + frnd(0.5);
  result.p_pha_offset = -0.3 + frnd(0.9);
  result.p_pha_ramp = -frnd(0.3);
  result.p_arp_speed = 0.6 + frnd(0.3);
  result.p_arp_mod = 0.8 - frnd(1.6);

  return result;
};



powerUp = function() {
  var result=Params();
  if (rnd(1))
    result.wave_type = SAWTOOTH;
  else
    result.p_duty = frnd(0.6);
  result.wave_type = Math.floor(frnd(SHAPES.length));
  if (result.wave_type === 3) {
    result.wave_type = SQUARE;
  }
  if (rnd(1))
  {
    result.p_base_freq = 0.2 + frnd(0.3);
    result.p_freq_ramp = 0.1 + frnd(0.4);
    result.p_repeat_speed = 0.4 + frnd(0.4);
  }
  else
  {
    result.p_base_freq = 0.2 + frnd(0.3);
    result.p_freq_ramp = 0.05 + frnd(0.2);
    if (rnd(1))
    {
      result.p_vib_strength = frnd(0.7);
      result.p_vib_speed = frnd(0.6);
    }
  }
  result.p_env_attack = 0.0;
  result.p_env_sustain = frnd(0.4);
  result.p_env_decay = 0.1 + frnd(0.4);

  return result;
};

hitHurt = function() {
  result = Params();
  result.wave_type = rnd(2);
  if (result.wave_type === SINE)
    result.wave_type = NOISE;
  if (result.wave_type === SQUARE)
    result.p_duty = frnd(0.6);
  result.wave_type = Math.floor(frnd(SHAPES.length));
  result.p_base_freq = 0.2 + frnd(0.6);
  result.p_freq_ramp = -0.3 - frnd(0.4);
  result.p_env_attack = 0.0;
  result.p_env_sustain = frnd(0.1);
  result.p_env_decay = 0.1 + frnd(0.2);
  if (rnd(1))
    result.p_hpf_freq = frnd(0.3);
  return result;
};


jump = function() {
  result = Params();
  result.wave_type = SQUARE;
  result.wave_type = Math.floor(frnd(SHAPES.length));
  if (result.wave_type === 3) {
    result.wave_type = SQUARE;
  }
  result.p_duty = frnd(0.6);
  result.p_base_freq = 0.3 + frnd(0.3);
  result.p_freq_ramp = 0.1 + frnd(0.2);
  result.p_env_attack = 0.0;
  result.p_env_sustain = 0.1 + frnd(0.3);
  result.p_env_decay = 0.1 + frnd(0.2);
  if (rnd(1))
    result.p_hpf_freq = frnd(0.3);
  if (rnd(1))
    result.p_lpf_freq = 1.0 - frnd(0.6);
  return result;
};

blipSelect = function() {
  result = Params();
  result.wave_type = rnd(1);
  result.wave_type = Math.floor(frnd(SHAPES.length));
  if (result.wave_type === 3) {
    result.wave_type = rnd(1);
  }
  if (result.wave_type === SQUARE)
    result.p_duty = frnd(0.6);
  result.p_base_freq = 0.2 + frnd(0.4);
  result.p_env_attack = 0.0;
  result.p_env_sustain = 0.1 + frnd(0.1);
  result.p_env_decay = frnd(0.2);
  result.p_hpf_freq = 0.1;
  return result;
};

random = function() {
  result = Params();
  result.wave_type = Math.floor(frnd(SHAPES.length));
  result.p_base_freq = Math.pow(frnd(2.0) - 1.0, 2.0);
  if (rnd(1))
    result.p_base_freq = Math.pow(frnd(2.0) - 1.0, 3.0) + 0.5;
  result.p_freq_limit = 0.0;
  result.p_freq_ramp = Math.pow(frnd(2.0) - 1.0, 5.0);
  if (result.p_base_freq > 0.7 && result.p_freq_ramp > 0.2)
    result.p_freq_ramp = -result.p_freq_ramp;
  if (result.p_base_freq < 0.2 && result.p_freq_ramp < -0.05)
    result.p_freq_ramp = -result.p_freq_ramp;
  result.p_freq_dramp = Math.pow(frnd(2.0) - 1.0, 3.0);
  result.p_duty = frnd(2.0) - 1.0;
  result.p_duty_ramp = Math.pow(frnd(2.0) - 1.0, 3.0);
  result.p_vib_strength = Math.pow(frnd(2.0) - 1.0, 3.0);
  result.p_vib_speed = frnd(2.0) - 1.0;
  result.p_env_attack = Math.pow(frnd(2.0) - 1.0, 3.0);
  result.p_env_sustain = Math.pow(frnd(2.0) - 1.0, 2.0);
  result.p_env_decay = frnd(2.0) - 1.0;
  result.p_env_punch = Math.pow(frnd(0.8), 2.0);
  if (result.p_env_attack + result.p_env_sustain + result.p_env_decay < 0.2) {
    result.p_env_sustain += 0.2 + frnd(0.3);
    result.p_env_decay += 0.2 + frnd(0.3);
  }
  result.p_lpf_resonance = frnd(2.0) - 1.0;
  result.p_lpf_freq = 1.0 - Math.pow(frnd(1.0), 3.0);
  result.p_lpf_ramp = Math.pow(frnd(2.0) - 1.0, 3.0);
  if (result.p_lpf_freq < 0.1 && result.p_lpf_ramp < -0.05)
    result.p_lpf_ramp = -result.p_lpf_ramp;
  result.p_hpf_freq = Math.pow(frnd(1.0), 5.0);
  result.p_hpf_ramp = Math.pow(frnd(2.0) - 1.0, 5.0);
  result.p_pha_offset = Math.pow(frnd(2.0) - 1.0, 3.0);
  result.p_pha_ramp = Math.pow(frnd(2.0) - 1.0, 3.0);
  result.p_repeat_speed = frnd(2.0) - 1.0;
  result.p_arp_speed = frnd(2.0) - 1.0;
  result.p_arp_mod = frnd(2.0) - 1.0;
  return result;
};

var generators = [
pickupCoin,
laserShoot,
explosion,
powerUp,
hitHurt,
jump,
blipSelect,
pushSound,
random,
birdSound
];

var generatorNames = [
'pickupCoin',
'laserShoot',
'explosion',
'powerUp',
'hitHurt',
'jump',
'blipSelect',
'pushSound',
'random',
'birdSound'
];

/*
i like 9675111
*/
generateFromSeed = function(seed) {
  rng = new RNG((seed / 100) | 0);
  var generatorindex = seed % 100;
  var soundGenerator = generators[generatorindex % generators.length];
  seeded = true;
  var result = soundGenerator();
  result.seed = seed;
  seeded = false;
  return result;
};

function SoundEffect(length, sample_rate) {
  this._buffer = AUDIO_CONTEXT.createBuffer(1, length, sample_rate);
}

SoundEffect.prototype.getBuffer = function() {
  return this._buffer.getChannelData(0);
};


SoundEffect.prototype.play = function() {
  var source = AUDIO_CONTEXT.createBufferSource();

  source.buffer = this._buffer;
  source.connect(AUDIO_CONTEXT.destination);


  var t = AUDIO_CONTEXT.currentTime;
  if (typeof source.start != 'undefined') {
    source.start(t);
  } else {
    source.noteOn(t);
  }
};

SoundEffect.MIN_SAMPLE_RATE = 22050;

if (typeof AUDIO_CONTEXT == 'undefined') {
  SoundEffect = function SoundEffect(length, sample_rate) {
    this._sample_rate = sample_rate;
    this._buffer = new Array(length);
    this._audioElement = null;
  };

  SoundEffect.prototype.getBuffer = function() {
    this._audioElement = null;
    return this._buffer;
  };

  SoundEffect.prototype.play = function() {
    if (this._audioElement) {
      this._audioElement.cloneNode(false).play();
    } else {
      for (var i = 0; i < this._buffer.length; i++) {
        // bit_depth is always 8, rescale [-1.0, 1.0) to [0, 256)
        this._buffer[i] = 255 & Math.floor(128 * Math.max(0, Math.min(this._buffer[i] + 1, 2)));
      }
      var wav = MakeRiff(this._sample_rate, BIT_DEPTH, this._buffer);
      this._audioElement = new Audio();
      this._audioElement.src = wav.dataURI;
      this._audioElement.play();
    }
  };

  SoundEffect.MIN_SAMPLE_RATE = 1;
}

SoundEffect.generate = function(ps) {
/*  window.console.log(ps.wave_type + "\t" + ps.seed);

  var psstring="";
  for (var n in ps) {
    if (ps.hasOwnProperty(n)) {
      psstring = psstring +"result." + n+" = " + ps[n] + ";\n";
    }
  }
window.console.log(ps);
window.console.log(psstring);*/
  function repeat() {
    rep_time = 0;

    fperiod = 100.0 / (ps.p_base_freq * ps.p_base_freq + 0.001);
    period = Math.floor(fperiod);
    fmaxperiod = 100.0 / (ps.p_freq_limit * ps.p_freq_limit + 0.001);

    fslide = 1.0 - Math.pow(ps.p_freq_ramp, 3.0) * 0.01;
    fdslide = -Math.pow(ps.p_freq_dramp, 3.0) * 0.000001;

    square_duty = 0.5 - ps.p_duty * 0.5;
    square_slide = -ps.p_duty_ramp * 0.00005;

    if (ps.p_arp_mod >= 0.0)
      arp_mod = 1.0 - Math.pow(ps.p_arp_mod, 2.0) * 0.9;
    else
      arp_mod = 1.0 + Math.pow(ps.p_arp_mod, 2.0) * 10.0;
    arp_time = 0;
    arp_limit = Math.floor(Math.pow(1.0 - ps.p_arp_speed, 2.0) * 20000 + 32);
    if (ps.p_arp_speed == 1.0)
      arp_limit = 0;
  };

  var rep_time;
  var fperiod, period, fmaxperiod;
  var fslide, fdslide;
  var square_duty, square_slide;
  var arp_mod, arp_time, arp_limit;
  repeat();  // First time through, this is a bit of a misnomer

  // Filter
  var fltp = 0.0;
  var fltdp = 0.0;
  var fltw = Math.pow(ps.p_lpf_freq, 3.0) * 0.1;
  var fltw_d = 1.0 + ps.p_lpf_ramp * 0.0001;
  var fltdmp = 5.0 / (1.0 + Math.pow(ps.p_lpf_resonance, 2.0) * 20.0) *
    (0.01 + fltw);
  if (fltdmp > 0.8) fltdmp = 0.8;
  var fltphp = 0.0;
  var flthp = Math.pow(ps.p_hpf_freq, 2.0) * 0.1;
  var flthp_d = 1.0 + ps.p_hpf_ramp * 0.0003;

  // Vibrato
  var vib_phase = 0.0;
  var vib_speed = Math.pow(ps.p_vib_speed, 2.0) * 0.01;
  var vib_amp = ps.p_vib_strength * 0.5;

  // Envelope
  var env_vol = 0.0;
  var env_stage = 0;
  var env_time = 0;
  var env_length = [
    Math.floor(ps.p_env_attack * ps.p_env_attack * 100000.0),
    Math.floor(ps.p_env_sustain * ps.p_env_sustain * 100000.0),
    Math.floor(ps.p_env_decay * ps.p_env_decay * 100000.0)
  ];
  var env_total_length = env_length[0] + env_length[1] + env_length[2];

  // Phaser
  var phase = 0;
  var fphase = Math.pow(ps.p_pha_offset, 2.0) * 1020.0;
  if (ps.p_pha_offset < 0.0) fphase = -fphase;
  var fdphase = Math.pow(ps.p_pha_ramp, 2.0) * 1.0;
  if (ps.p_pha_ramp < 0.0) fdphase = -fdphase;
  var iphase = Math.abs(Math.floor(fphase));
  var ipp = 0;
  var phaser_buffer = [];
  for (var i = 0; i < 1024; ++i)
    phaser_buffer[i] = 0.0;

  // Noise
  var noise_buffer = [];
  for (var i = 0; i < 32; ++i)
    noise_buffer[i] = Math.random() * 2.0 - 1.0;

  // Repeat
  var rep_limit = Math.floor(Math.pow(1.0 - ps.p_repeat_speed, 2.0) * 20000
                             + 32);
  if (ps.p_repeat_speed == 0.0)
    rep_limit = 0;

  //var gain = 2.0 * Math.log(1 + (Math.E - 1) * ps.sound_vol);
  var gain = 2.0 * ps.sound_vol;
  var gain = Math.exp(ps.sound_vol) - 1;

  var num_clipped = 0;

  // ...end of initialization. Generate samples.

  var sample_sum = 0;
  var num_summed = 0;
  var summands = Math.floor(44100 / ps.sample_rate);

  var buffer_i = 0;
  var buffer_length = Math.ceil(env_total_length / summands);
  var buffer_complete = false;

  var sound;
  if (ps.sample_rate < SoundEffect.MIN_SAMPLE_RATE) {
    // Assume 4x gets close enough to MIN_SAMPLE_RATE
    sound = new SoundEffect(4 * buffer_length, SoundEffect.MIN_SAMPLE_RATE);
  } else {
    sound = new SoundEffect(buffer_length, ps.sample_rate)
  }
  var buffer = sound.getBuffer();

  for (var t = 0;; ++t) {

    // Repeats
    if (rep_limit != 0 && ++rep_time >= rep_limit)
      repeat();

    // Arpeggio (single)
    if (arp_limit != 0 && t >= arp_limit) {
      arp_limit = 0;
      fperiod *= arp_mod;
    }

    // Frequency slide, and frequency slide slide!
    fslide += fdslide;
    fperiod *= fslide;
    if (fperiod > fmaxperiod) {
      fperiod = fmaxperiod;
      if (ps.p_freq_limit > 0.0)
        buffer_complete = true;
    }

    // Vibrato
    var rfperiod = fperiod;
    if (vib_amp > 0.0) {
      vib_phase += vib_speed;
      rfperiod = fperiod * (1.0 + Math.sin(vib_phase) * vib_amp);
    }
    period = Math.floor(rfperiod);
    if (period < 8) period = 8;

    square_duty += square_slide;
    if (square_duty < 0.0) square_duty = 0.0;
    if (square_duty > 0.5) square_duty = 0.5;

    // Volume envelope
    env_time++;
    if (env_time > env_length[env_stage]) {
      env_time = 0;
      env_stage++;
      if (env_stage === 3)
        buffer_complete = true;
    }
    if (env_stage === 0)
      env_vol = env_time / env_length[0];
    else if (env_stage === 1)
      env_vol = 1.0 + Math.pow(1.0 - env_time / env_length[1],
                               1.0) * 2.0 * ps.p_env_punch;
    else  // env_stage == 2
      env_vol = 1.0 - env_time / env_length[2];

    // Phaser step
    fphase += fdphase;
    iphase = Math.abs(Math.floor(fphase));
    if (iphase > 1023) iphase = 1023;

    if (flthp_d != 0.0) {
      flthp *= flthp_d;
      if (flthp < 0.00001)
        flthp = 0.00001;
      if (flthp > 0.1)
        flthp = 0.1;
    }

    // 8x supersampling
    var sample = 0.0;
    for (var si = 0; si < 8; ++si) {
      var sub_sample = 0.0;
      phase++;
      if (phase >= period) {
        phase %= period;
        if (ps.wave_type === NOISE)
          for (var i = 0; i < 32; ++i)
            noise_buffer[i] = Math.random() * 2.0 - 1.0;
      }

      // Base waveform
      var fp = phase / period;
      if (ps.wave_type === SQUARE) {
        if (fp < square_duty)
          sub_sample = 0.5;
        else
          sub_sample = -0.5;
      } else if (ps.wave_type === SAWTOOTH) {
        sub_sample = 1.0 - fp * 2;
      } else if (ps.wave_type === SINE) {
        sub_sample = Math.sin(fp * 2 * Math.PI);
      } else if (ps.wave_type === NOISE) {
        sub_sample = noise_buffer[Math.floor(phase * 32 / period)];
      } else if (ps.wave_type === TRIANGLE) {
        sub_sample = Math.abs(1 - fp * 2) - 1;
      } else if (ps.wave_type === BREAKER) {
        sub_sample = Math.abs(1 - fp * fp * 2) - 1;
      } else {
        throw new Exception('bad wave type! ' + ps.wave_type);
      }

      // Low-pass filter
      var pp = fltp;
      fltw *= fltw_d;
      if (fltw < 0.0) fltw = 0.0;
      if (fltw > 0.1) fltw = 0.1;
      if (ps.p_lpf_freq != 1.0) {
        fltdp += (sub_sample - fltp) * fltw;
        fltdp -= fltdp * fltdmp;
      } else {
        fltp = sub_sample;
        fltdp = 0.0;
      }
      fltp += fltdp;

      // High-pass filter
      fltphp += fltp - pp;
      fltphp -= fltphp * flthp;
      sub_sample = fltphp;

      // Phaser
      phaser_buffer[ipp & 1023] = sub_sample;
      sub_sample += phaser_buffer[(ipp - iphase + 1024) & 1023];
      ipp = (ipp + 1) & 1023;

      // final accumulation and envelope application
      sample += sub_sample * env_vol;
    }

    // Accumulate samples appropriately for sample rate
    sample_sum += sample;
    if (++num_summed >= summands) {
      num_summed = 0;
      sample = sample_sum / summands;
      sample_sum = 0;
    } else {
      continue;
    }

    sample = sample / 8 * masterVolume;
    sample *= gain;

    buffer[buffer_i++] = sample;

    if (ps.sample_rate < SoundEffect.MIN_SAMPLE_RATE) {
      buffer[buffer_i++] = sample;
      buffer[buffer_i++] = sample;
      buffer[buffer_i++] = sample;
    }

    if (buffer_complete) {
      for (; buffer_i < buffer_length; buffer_i++) {
        if (ps.sample_rate < SoundEffect.MIN_SAMPLE_RATE) {
          buffer[buffer_i++] = 0;
          buffer[buffer_i++] = 0;
          buffer[buffer_i++] = 0;
        }
        buffer[buffer_i] = 0;
      }
      break;
    }
  }
  return sound;
};

if (typeof exports != 'undefined') {
  // For node.js
  var RIFFWAVE = require('./riffwave').RIFFWAVE;
  exports.Params = Params;
  exports.generate = generate;
}

var sfxCache = {};
var cachedSeeds = [];
var CACHE_MAX = 50;

function cacheSeed(seed){
  if (seed in sfxCache) {
    return sfxCache[seed];
  }

  var params = generateFromSeed(seed);
  params.sound_vol = SOUND_VOL;
  params.sample_rate = SAMPLE_RATE;
  params.bit_depth = BIT_DEPTH;

  var sound = SoundEffect.generate(params);
  sfxCache[seed] = sound;
  cachedSeeds.push(seed);

  while (cachedSeeds.length>CACHE_MAX) {
    var toRemove=cachedSeeds[0];
    cachedSeeds = cachedSeeds.slice(1);
    delete sfxCache[toRemove];
  }

  return sound;
}

var lastSoundCoord=-1;
function playSound(seed,force) {
  var curCoord=Math.round(bpx)+100000*Math.round(bpy)+seed*1000;
  if (force===true){
  }else if (curCoord===lastSoundCoord){
    return;
  }
  var sound = cacheSeed(seed);
  sound.play();

  lastSoundCoord=curCoord;
}