/// <summary>
/// Updates the field by interpolating between two sampled values over the particle's lifetime
/// </summary>
/// <param name="pool">Target <see cref="ParticlePool"/></param>
private unsafe void UpdateDoubleSampler(ParticlePool pool)
{
var colorField = pool.GetField(ParticleFields.Color);
var lifeField = pool.GetField(ParticleFields.Life);
var randField = pool.GetField(ParticleFields.RandomSeed);
SamplerMain.UpdateChanges();
SamplerOptional.UpdateChanges();
foreach (var particle in pool)
{
var life = 1f - (*((float *)particle[lifeField])); // The Life field contains remaining life, so for sampling we take (1 - life)
var randSeed = particle.Get(randField);
var lerp = randSeed.GetFloat(RandomOffset.Offset1A + SeedOffset);
var colorMin = (Color4)SamplerMain.Evaluate(life);
var colorMax = (Color4)SamplerOptional.Evaluate(life);
var color = Color4.Lerp(colorMin, colorMax, lerp);
// Premultiply alpha
color.R *= color.A;
color.G *= color.A;
color.B *= color.A;
(*((Color4 *)particle[colorField])) = color;
}
}
/// <inheritdoc />
public override void PreUpdate()
{
base.PreUpdate();
SamplerMain?.UpdateChanges();
SamplerOptional?.UpdateChanges();
}
/// <summary>
/// Updates the field by interpolating between two sampled values over the particle's lifetime
/// </summary>
/// <param name="pool">Target <see cref="ParticlePool"/></param>
private unsafe void UpdateDoubleSampler(ParticlePool pool)
{
var sizeField = pool.GetField(ParticleFields.Size);
var lifeField = pool.GetField(ParticleFields.Life);
var randField = pool.GetField(ParticleFields.RandomSeed);
SamplerMain.UpdateChanges();
SamplerOptional.UpdateChanges();
foreach (var particle in pool)
{
var life = 1f - (*((float *)particle[lifeField])); // The Life field contains remaining life, so for sampling we take (1 - life)
var randSeed = particle.Get(randField);
var lerp = randSeed.GetFloat(RandomOffset.Offset1A + SeedOffset);
var size1 = SamplerMain.Evaluate(life);
var size2 = SamplerOptional.Evaluate(life);
(*((float *)particle[sizeField])) = WorldScale.X * (size1 + (size2 - size1) * lerp);
}
}
