/// <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]);
var spriteId = startingFrame + (int)(normalizedTimeline * animationSpeedOverLife);
var uvTransform = new Vector4((spriteId % xDivisions) * xStep, (spriteId / yDivisions) * yStep, xStep, yStep);
ParticleVertexBuilder.TransformAttributeDelegate <Vector2> transformCoords =
(ref Vector2 value) =>
{
value.X = uvTransform.X + uvTransform.Z * value.X;
value.Y = uvTransform.Y + uvTransform.W * value.Y;
};
vertexBuilder.TransformAttributePerParticle(texDefault, texAttribute, transformCoords);
vertexBuilder.NextParticle();
}
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]);;
var uvTransform = Vector4.Lerp(StartFrame, EndFrame, normalizedTimeline);
uvTransform.Z -= uvTransform.X;
uvTransform.W -= uvTransform.Y;
ParticleVertexBuilder.TransformAttributeDelegate <Vector2> transformCoords =
(ref Vector2 value) =>
{
value.X = uvTransform.X + uvTransform.Z * value.X;
value.Y = uvTransform.Y + uvTransform.W * value.Y;
};
vertexBuilder.TransformAttributePerParticle(texDefault, texAttribute, transformCoords);
vertexBuilder.NextParticle();
}
vertexBuilder.RestartBuffer();
}
