/// <summary>
/// Should be called before <see cref="ApplyParticleUpdaters"/> to ensure dead particles are removed before they are updated
/// </summary>
/// <param name="dt">Delta time, elapsed time since the last call, in seconds</param>
private unsafe void MoveAndDeleteParticles(float dt)
{
// Hardcoded life update
if (pool.FieldExists(ParticleFields.RemainingLife) && pool.FieldExists(ParticleFields.RandomSeed))
{
var lifeField = pool.GetField(ParticleFields.RemainingLife);
var randField = pool.GetField(ParticleFields.RandomSeed);
var lifeStep = particleLifetime.Y - particleLifetime.X;
var particleEnumerator = pool.GetEnumerator();
while (particleEnumerator.MoveNext())
{
var particle = particleEnumerator.Current;
var randSeed = *(RandomSeed *)(particle[randField]);
var life = (float *)particle[lifeField];
if (*life > 1)
{
*life = 1;
}
var startingLife = particleLifetime.X + lifeStep * randSeed.GetFloat(0);
if (*life <= MathUtil.ZeroTolerance)
{
particleEnumerator.RemoveCurrent(ref particle);
}
else
if ((*life -= (dt / startingLife)) <= MathUtil.ZeroTolerance)
{
if (DelayParticleDeath > 0)
{
*life = MathUtil.ZeroTolerance;
}
else
{
particleEnumerator.RemoveCurrent(ref particle);
}
}
}
}
// Hardcoded position and old position updates
// If we have to preserve the particle's old position, do it before updating the position for the first time
if (pool.FieldExists(ParticleFields.Position) && pool.FieldExists(ParticleFields.OldPosition))
{
var posField = pool.GetField(ParticleFields.Position);
var oldField = pool.GetField(ParticleFields.OldPosition);
foreach (var particle in pool)
{
(*((Vector3 *)particle[oldField])) = (*((Vector3 *)particle[posField]));
}
}
// Hardcoded position and velocity update
if (pool.FieldExists(ParticleFields.Position) && pool.FieldExists(ParticleFields.Velocity))
{
var posField = pool.GetField(ParticleFields.Position);
var velField = pool.GetField(ParticleFields.Velocity);
foreach (var particle in pool)
{
var pos = ((Vector3 *)particle[posField]);
var vel = ((Vector3 *)particle[velField]);
*pos += *vel * dt;
}
}
}
/// <summary>
/// Returns a particle field accessor for the contained <see cref="ParticlePool"/>
/// </summary>
/// <typeparam name="T">Type data for the field</typeparam>
/// <param name="fieldDesc">The field description</param>
/// <returns></returns>
public ParticleFieldAccessor <T> GetField <T>(ParticleFieldDescription <T> fieldDesc) where T : struct
{
return(particlePool.GetField <T>(fieldDesc));
}
/// <summary>
/// Should be called before <see cref="ApplyParticleUpdaters"/> to ensure dead particles are removed before they are updated
/// </summary>
/// <param name="dt">Delta time, elapsed time since the last call, in seconds</param>
private unsafe void MoveAndDeleteParticles(float dt)
{
// Hardcoded life update
if (pool.FieldExists(ParticleFields.RemainingLife) && pool.FieldExists(ParticleFields.RandomSeed))
{
var lifeField = pool.GetField(ParticleFields.RemainingLife);
var randField = pool.GetField(ParticleFields.RandomSeed);
var lifeStep = particleLifetime.Y - particleLifetime.X;
var particleEnumerator = pool.GetEnumerator();
while (particleEnumerator.MoveNext())
{
var particle = particleEnumerator.Current;
var randSeed = *(RandomSeed *)(particle[randField]);
var life = (float *)particle[lifeField];
if (*life > 1)
{
*life = 1;
}
var startingLife = particleLifetime.X + lifeStep * randSeed.GetFloat(0);
if (*life <= 0 || (*life -= (dt / startingLife)) <= 0)
{
particleEnumerator.RemoveCurrent(ref particle);
}
}
}
// Hardcoded position and velocity update
if (pool.FieldExists(ParticleFields.Position) && pool.FieldExists(ParticleFields.Velocity))
{
// should this be a separate module?
// Position and velocity update only
var posField = pool.GetField(ParticleFields.Position);
var velField = pool.GetField(ParticleFields.Velocity);
foreach (var particle in pool)
{
var pos = ((Vector3 *)particle[posField]);
var vel = ((Vector3 *)particle[velField]);
*pos += *vel * dt;
}
}
}
