// Update is called once per frame
private void Update(float dt)
{
// Wheel controls
bool isBraking = _input.GetKeyDown((int)SDL.SDL_Keycode.SDLK_DOWN);
bool isAccelerating = _input.GetKeyDown((int)SDL.SDL_Keycode.SDLK_UP);
foreach (Wheel wheel in _wheels)
{
// We give priority to braking
if (isBraking)
{
// This function also emit particles
Wheel.DynamicsData wheelDynamics = wheel.ApplyNonLinearTorque(_horsePower, _maxSpdBwd, true);
if (wheelDynamics.IsInContact)
{
// If the wheel is in contact, we play the braking sound according to the current work in the wheel
if (_soundSource.Sound != _brakeSound || !_soundSource.IsPlaying())
{
_soundSource.Play(_brakeSound);
}
_soundSource.SetFrequency(48000);
_soundSource.Gain = wheelDynamics.Resistance * -1;
if (_soundSource.Gain > 1)
{
_soundSource.Gain = 1;
}
}
else
{
_soundSource.Stop();
}
}
else if (isAccelerating)
{
Wheel.DynamicsData wheelDynamics = wheel.ApplyNonLinearTorque(-_horsePower, -_maxSpdFwd);
// We set the sound frequency according to the speed and gain according to the work being done
_soundSource.SetFrequency((wheelDynamics.AngularVelocity / -40 + 1) * 48000);
_soundSource.Gain += 0.03f;
if (_soundSource.Gain > 1)
{
_soundSource.Gain = 1;
}
_soundSource.Gain += Math.Abs(1 - wheelDynamics.Resistance * 5);
if (_soundSource.Sound != _accelSound || !_soundSource.IsPlaying())
{
_soundSource.Play(_accelSound);
}
}
else
{
// If it's not receiving any input, fades out engine sound or stop other sounds
if (_soundSource.Sound == _accelSound)
{
_soundSource.SetFrequency(48000);
_soundSource.Gain -= 0.01f;
if (_soundSource.Gain < 0.3f)
{
_soundSource.Gain = 0.3f;
}
}
else
{
_soundSource.Stop();
}
// We emit surface particles anyway
wheel.EmitSurfaceParticles();
}
}
// Roll controls
if (_input.GetKeyDown((int)SDL.SDL_Keycode.SDLK_LEFT))
{
_rigidBody.ApplyTorque(_rollForce, true);
}
if (_input.GetKeyDown((int)SDL.SDL_Keycode.SDLK_RIGHT))
{
_rigidBody.ApplyTorque(_rollForce * -1, true);
}
// Debug control for when you rolled over
if (_input.GetKeyDown((int)SDL.SDL_Keycode.SDLK_SPACE))
{
_rigidBody.SetAngularVelocity(2);
}
// We apply bit of the vehicle's velocity to the exhaust particles so they look OK
Vector2 currentVelocity = _rigidBody.GetLinearVelocity();
_exhaustParticles.Effect.Speed = Math.Abs(100 + currentVelocity.LengthFast * 20);
_exhaustParticles.Effect.SpeedVariance = currentVelocity.LengthFast * 10;
_exhaustParticles.Effect.Angle = -Node.Rotation2D +
(float)(Math.Atan2(currentVelocity.X - 5, -currentVelocity.Y) * (360 / (Math.PI * 2))) - 90;
// Suspension sounds
foreach (Wheel wheel in _wheels)
{
if (wheel.CurrentSuspensionCompression() > 0.7f)
{
if (DateTime.Now - lastSuspensionSound > TimeSpan.FromMilliseconds(500))
{
lastSuspensionSound = DateTime.Now;
_suspensionSoundSource.Play(_suspensionSounds[new Random().Next(_suspensionSounds.Length)]);
}
}
}
}
