internal void InternalProcess(float deltaTime, EffectInstance instance, Particle[] particles, int begin, int end)
{
Process(deltaTime, instance, particles, begin, end);
}
internal void Update(float deltaTime)
{
int oldCapacity = m_particles != null ? m_particles.Length : 0;
if (oldCapacity != Effect.Capacity
|| m_oldAlignment != Effect.Alignment)
{
m_particles = Effect.Capacity != 0 ? new Particle[Effect.Capacity] : null;
m_particleLocalFrames = Effect.Capacity != 0 && Effect.Alignment == Alignment.Local ? new LocalFrame[Effect.Capacity] : null;
m_liveParticleStart = 0;
m_liveParticleEnd = 0;
m_newParticleEnd = 0;
m_oldAlignment = Effect.Alignment;
}
if (m_oldEmissionRate != Effect.EmissionRate)
{
m_emissionReminder = 0;
m_oldEmissionRate = Effect.EmissionRate;
}
Debug.Assert(m_newParticleEnd == m_liveParticleEnd, "New particles have been emitted without a call to EndEmit().");
// update current particles
int writePos = m_liveParticleEnd;
for (int i = m_liveParticleStart; i != m_liveParticleEnd; i = IncrementIndex(i))
{
Particle p = m_particles[i];
p.m_age += deltaTime;
if (p.m_age < p.m_life)
{
p.m_position += p.m_velocity * deltaTime;
m_particles[writePos] = p;
if (m_particleLocalFrames != null)
m_particleLocalFrames[writePos] = m_particleLocalFrames[i];
writePos = IncrementIndex(writePos);
}
}
m_liveParticleStart = m_liveParticleEnd;
m_newParticleEnd = m_liveParticleEnd = writePos;
BatchProcess((particles, begin, end) =>
{
foreach (var mod in Effect.ModifiersOnUpdate)
{
mod.InternalProcess(deltaTime, this, particles, begin, end);
}
});
m_templateParticle = new Particle
{
m_life = Effect.DefaultParticleLifetime,
m_age = 0f,
m_position = Effect.DefaultParticlePosition,
m_velocity = Effect.DefaultParticleVelocity,
m_size = Effect.DefaultParticleSize,
m_rotation = Effect.DefaultParticleRotation,
m_color = Color.FromXnaColor(Effect.DefaultParticleColor)
};
if (IsEmitting)
{
// emit new particles
m_emissionReminder += deltaTime;
float interval = 1.0f / Effect.EmissionRate;
while (m_emissionReminder > interval)
{
Emit(Template);
m_emissionReminder -= interval;
}
EndEmit();
}
}
protected virtual void Process(float deltaTime, EffectInstance instance, Particle[] particles, int begin, int end) { }
public void Emit(Particle particle)
{
Debug.Assert(IncrementIndex(m_newParticleEnd) != m_liveParticleStart, "Particle array overflow.");
m_particles[m_newParticleEnd] = particle;
if (Effect.Alignment == Alignment.Local)
{
if (SystemInstance.LocalFrameProvider != null)
{
m_particleLocalFrames[m_newParticleEnd] = SystemInstance.LocalFrameProvider.LocalFrame;
}
else
{
m_particleLocalFrames[m_newParticleEnd].Col0 = Vector4.UnitX;
m_particleLocalFrames[m_newParticleEnd].Col1 = Vector4.UnitY;
m_particleLocalFrames[m_newParticleEnd].Col2 = Vector4.UnitZ;
m_particleLocalFrames[m_newParticleEnd].Col3 = Vector4.UnitW;
}
}
m_newParticleEnd = IncrementIndex(m_newParticleEnd);
}