public void Sort(ParticleSystemInstance instance, Vector3 camDir)
{
if (instance == null)
{
throw new ArgumentNullException("system");
}
Debug.Assert(m_sortedIndices.Length == m_depth.Length);
int totalParticles = instance.TotalLiveParticles;
int destLength = m_sortedIndices.Length;
while (destLength < totalParticles)
{
destLength *= 2;
}
if (destLength > m_sortedIndices.Length)
{
m_sortedIndices = new int[destLength];
m_depth = new float[destLength];
}
// fill the indices
for (int i = 0; i < totalParticles; ++i)
{
m_sortedIndices[i] = i;
}
// sort the indices by depth
if (instance.System.BlendMode == BlendMode.Alpha)
{
int j = 0;
foreach (var effect in instance.EffectInstances)
{
effect.BatchProcess((particles, begin, end) =>
{
for (int i = begin; i < end; ++i)
{
var p = particles[i];
m_depth[j++] = Vector3.Dot(p.m_position, camDir);
}
});
}
Array.Sort(m_depth, m_sortedIndices, 0, totalParticles);
}
}
internal EffectInstance(Effect effect, ParticleSystemInstance instance)
{
if (effect == null)
{
throw new ArgumentNullException("effect");
}
else if (instance == null)
{
throw new ArgumentNullException("instance");
}
else if (instance.System != effect.System)
{
throw new ArgumentException("Effect and Instance is not from the same ParticleSystem.");
}
Effect = effect;
SystemInstance = instance;
IsEmitting = effect.EmitOnStart;
m_oldAlignment = effect.Alignment;
}