/// <inheritdoc />
public override unsafe int BuildVertexBuffer(ref ParticleBufferState bufferState, Vector3 invViewX, Vector3 invViewY,
ref Vector3 spaceTranslation, ref Quaternion spaceRotation, float spaceScale, ref ParticleList sorter)
{
// Get all the required particle fields
var positionField = sorter.GetField(ParticleFields.Position);
if (!positionField.IsValid())
return 0;
var sizeField = sorter.GetField(ParticleFields.Size);
var orderField = sorter.GetField(ParticleFields.Order);
// Check if the draw space is identity - in this case we don't need to transform the position, scale and rotation vectors
// ReSharper disable once CompareOfFloatsByEqualityOperator
var trsIdentity = (spaceScale == 1f);
trsIdentity = trsIdentity && (spaceTranslation.Equals(new Vector3(0, 0, 0)));
trsIdentity = trsIdentity && (spaceRotation.Equals(Quaternion.Identity));
var ribbonizer = new Ribbonizer(this, currentTotalParticles, currentQuadsPerParticle);
var renderedParticles = 0;
bufferState.StartOver();
uint oldOrderValue = 0;
foreach (var particle in sorter)
{
if (orderField.IsValid())
{
var orderValue = (*((uint*)particle[orderField]));
if ((orderValue >> SpawnOrderConst.GroupBitOffset) != (oldOrderValue >> SpawnOrderConst.GroupBitOffset))
{
ribbonizer.Ribbonize(ref bufferState, invViewX, invViewY, QuadsPerParticle);
ribbonizer.RibbonSplit();
}
oldOrderValue = orderValue;
}
var centralPos = particle.Get(positionField);
var particleSize = sizeField.IsValid() ? particle.Get(sizeField) : 1f;
if (!trsIdentity)
{
spaceRotation.Rotate(ref centralPos);
centralPos = centralPos * spaceScale + spaceTranslation;
particleSize *= spaceScale;
}
ribbonizer.AddParticle(ref centralPos, particleSize);
renderedParticles++;
}
ribbonizer.Ribbonize(ref bufferState, invViewX, invViewY, QuadsPerParticle);
ribbonizer.Free();
var vtxPerShape = 4 * QuadsPerParticle;
return renderedParticles * vtxPerShape;
}
/// <inheritdoc />
public override unsafe int BuildVertexBuffer(ref ParticleBufferState bufferState, Vector3 invViewX, Vector3 invViewY,
ref Vector3 spaceTranslation, ref Quaternion spaceRotation, float spaceScale, ref ParticleList sorter, ref Matrix viewProj)
{
// Get all the required particle fields
var positionField = sorter.GetField(ParticleFields.Position);
if (!positionField.IsValid())
{
return(0);
}
var sizeField = sorter.GetField(ParticleFields.Size);
var directionField = sorter.GetField(ParticleFields.Direction);
// Check if the draw space is identity - in this case we don't need to transform the position, scale and rotation vectors
var trsIdentity = (spaceScale == 1f);
trsIdentity = trsIdentity && (spaceTranslation.Equals(new Vector3(0, 0, 0)));
trsIdentity = trsIdentity && (spaceRotation.Equals(Quaternion.Identity));
var ribbonizer = new Ribbonizer(this, currentTotalParticles, currentQuadsPerParticle);
var renderedParticles = 0;
bufferState.StartOver();
uint oldOrderValue = 0;
var orderField = sorter.GetField(ParticleFields.Order);
foreach (var particle in sorter)
{
if (orderField.IsValid())
{
var orderValue = (*((uint *)particle[orderField]));
if ((orderValue >> SpawnOrderConst.GroupBitOffset) != (oldOrderValue >> SpawnOrderConst.GroupBitOffset))
{
ribbonizer.Ribbonize(ref bufferState, QuadsPerParticle);
ribbonizer.RibbonSplit();
}
oldOrderValue = orderValue;
}
var centralPos = particle.Get(positionField);
var particleSize = sizeField.IsValid() ? particle.Get(sizeField) : 1f;
var particleDirection = directionField.IsValid() ? particle.Get(directionField) * particleSize : new Vector3(0f, particleSize, 0f);
if (!trsIdentity)
{
spaceRotation.Rotate(ref centralPos);
centralPos = centralPos * spaceScale + spaceTranslation;
// Direction
spaceRotation.Rotate(ref particleDirection);
particleDirection *= spaceScale;
}
ribbonizer.AddParticle(ref centralPos, ref particleDirection);
renderedParticles++;
}
ribbonizer.Ribbonize(ref bufferState, QuadsPerParticle);
ribbonizer.Free();
var vtxPerShape = 4 * QuadsPerParticle;
return(renderedParticles * vtxPerShape);
}
