/// <inheritdoc />
public override unsafe void PatchVertexBuffer(ParticleVertexBuilder vertexBuilder, Vector3 invViewX, Vector3 invViewY, ParticleSorter sorter)
{
// If you want, you can integrate the base builder here and not call it. It should result in slight speed up
base.PatchVertexBuffer(vertexBuilder, invViewX, invViewY, sorter);
var colorField = sorter.GetField(ParticleFields.Color);
if (!colorField.IsValid())
{
return;
}
var colAttribute = vertexBuilder.GetAccessor(VertexAttributes.Color);
if (colAttribute.Size <= 0)
{
return;
}
foreach (var particle in sorter)
{
// Set the vertex color attribute to the particle's color field
var color = (uint)(*(Color4 *)particle[colorField]).ToRgba();
vertexBuilder.SetAttributePerSegment(colAttribute, (IntPtr)(&color));
vertexBuilder.NextSegment();
}
vertexBuilder.RestartBuffer();
}
/// <inheritdoc />
public unsafe override void BuildUVCoordinates(ParticleVertexBuilder vertexBuilder, ParticleSorter sorter, AttributeDescription texCoordsDescription)
{
var lifeField = sorter.GetField(ParticleFields.RemainingLife);
if (!lifeField.IsValid())
{
return;
}
var texAttribute = vertexBuilder.GetAccessor(texCoordsDescription);
if (texAttribute.Size == 0 && texAttribute.Offset == 0)
{
return;
}
var texDefault = vertexBuilder.GetAccessor(vertexBuilder.DefaultTexCoords);
if (texDefault.Size == 0 && texDefault.Offset == 0)
{
return;
}
foreach (var particle in sorter)
{
var normalizedTimeline = 1f - *(float *)(particle[lifeField]);;
uvTransform = Vector4.Lerp(StartFrame, EndFrame, normalizedTimeline);
uvTransform.Z -= uvTransform.X;
uvTransform.W -= uvTransform.Y;
vertexBuilder.TransformAttributePerSegment(texDefault, texAttribute, this);
vertexBuilder.NextSegment();
}
vertexBuilder.RestartBuffer();
}