} // end of FireballEmitter Update()
public override void Render(Camera camera)
{
if (active)
{
Sphere sphere = Sphere.GetInstance();
// Get the effect we need.
Effect effect = manager.Effect3d;
// Set up common rendering values.
effect.CurrentTechnique = manager.Technique3d((int)ParticleSystemManager.EffectTech3d.PremultAlphaGlowColorPass);
manager.Parameter3d(ParticleSystemManager.EffectParams3d.DiffuseColor).SetValue(color.ToVector4());
// Set up world matrix.
Matrix worldMatrix = Matrix.Identity;
//worldMatrix.Translation = position;
manager.Parameter3d(ParticleSystemManager.EffectParams3d.GlowFactor).SetValue(1.0f);
// Render all the fireballs first.
for (int i = 0; i < particleList.Count; i++)
{
FireballParticle particle = (FireballParticle)particleList[i];
// Need to check age since we may still have expired
// particles in the list while their smoke fades.
if (particle.age < particle.lifetime)
{
// Set radius and translation.
worldMatrix.Translation = particle.position;
Matrix worldViewProjMatrix = worldMatrix * camera.ViewProjectionMatrix;
// Set radius.
manager.Parameter3d(ParticleSystemManager.EffectParams3d.Radius).SetValue(particle.radius);
// Set alpha.
manager.Parameter3d(ParticleSystemManager.EffectParams3d.Alpha).SetValue(particle.alpha);
// Set color
manager.Parameter3d(ParticleSystemManager.EffectParams3d.DiffuseColor).SetValue(particle.color.ToVector4());
sphere.Render(camera, ref worldMatrix, effect);
}
}
// Then render the smoke for all the fireballs.
for (int i = 0; i < particleList.Count; i++)
{
FireballParticle particle = (FireballParticle)particleList[i];
particle.smokeEmitter.Render(camera);
}
} // end of if active
} // end of Emitter Render()
private float partial = 1.0f; // Start loaded and ready to shoot.
public override void Update(Camera camera)
{
if (active)
{
float dt = Time.GameTimeFrameSeconds;
dt = MathHelper.Clamp(dt, 0.0f, 1.0f); // Limit to reasonable values.
partial += dt * fireRate;
// Note this is set up so that at most a single particle will be
// emitted per Update call. This works for the fireballs but may
// not be right for other particle effects.
if (shotPending && partial >= 1.0f)
{
FireballParticle ball = new FireballParticle(Color.Red, manager);
ball.velocity = at - from;
ball.lifetime = 2.5f * ball.velocity.Length() / speed;
ball.velocity.Normalize();
ball.velocity *= speed;
ball.position = from;
ball.fireball.Movement.Position = ball.position;
particleList.Add(ball);
partial = 0.0f;
shotPending = false;
}
// Update any existing particles. For more heavyweight particles we could
// have an Update call per particle. These are lightweight enough that we
// can just update them directly.
for (int i = 0; i < particleList.Count;)
{
FireballParticle particle = (FireballParticle)particleList[i];
particle.age += dt;
Debug.Assert(particle.age >= 0.0f);
float t = particle.age / particle.lifetime;
if (t > 1.0f)
{
// Dead particle but we can't remove it until all the smoke
// it generated has gone. Turn off the emission of the smoke
// particles and just let the exisitng ones fade out.
particle.smokeEmitter.Emitting = false;
if (particle.smokeEmitter.ListIsEmpty)
{
particleList.RemoveAt(i);
}
else
{
particle.smokeEmitter.Update(camera);
i++;
}
// Go ahead and remove the GameThing right away.
if (particle.fireball != null)
{
particle.fireball.Deactivate();
InGame.inGame.gameThingList.Remove(particle.fireball);
particle.fireball = null;
}
}
else
{
particle.radius = MyMath.Lerp(startRadius, endRadius, t);
particle.alpha = MyMath.Lerp(startAlpha, endAlpha, t);
particle.position += particle.velocity * dt;
particle.fireball.Movement.Position = particle.position;
particle.smokeEmitter.Position = particle.position;
particle.smokeEmitter.Velocity = particle.velocity;
particle.smokeEmitter.Update(camera);
i++;
}
}
} // end of if active
} // end of FireballEmitter Update()
