protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
{
var mesh = inputExpression[0];
var meshVertexStride = new VFXExpressionMeshVertexStride(mesh);
var meshVertexCount = new VFXExpressionMeshVertexCount(mesh);
var vertexIndex = VFXOperatorUtility.ApplyAddressingMode(inputExpression[1], meshVertexCount, mode);
var outputExpressions = new List <VFXExpression>();
foreach (var vertexAttribute in GetOutputVertexAttributes())
{
var meshChannelOffset = new VFXExpressionMeshChannelOffset(mesh, VFXValue.Constant <uint>((uint)GetActualVertexAttribute(vertexAttribute)));
var outputType = GetOutputType(vertexAttribute);
VFXExpression sampled = null;
if (vertexAttribute == VertexAttributeFlag.Color)
{
sampled = new VFXExpressionSampleMeshColor(mesh, vertexIndex, meshChannelOffset, meshVertexStride);
}
else if (outputType == typeof(float))
{
sampled = new VFXExpressionSampleMeshFloat(mesh, vertexIndex, meshChannelOffset, meshVertexStride);
}
else if (outputType == typeof(Vector2))
{
sampled = new VFXExpressionSampleMeshFloat2(mesh, vertexIndex, meshChannelOffset, meshVertexStride);
}
else if (outputType == typeof(Vector3))
{
sampled = new VFXExpressionSampleMeshFloat3(mesh, vertexIndex, meshChannelOffset, meshVertexStride);
}
else
{
sampled = new VFXExpressionSampleMeshFloat4(mesh, vertexIndex, meshChannelOffset, meshVertexStride);
}
outputExpressions.Add(sampled);
}
return(outputExpressions.ToArray());
}
public static IEnumerable <VFXExpression> SampleVertexAttribute(VFXExpression source, VFXExpression vertexIndex, IEnumerable <VertexAttribute> vertexAttributes)
{
bool skinnedMesh = source.valueType == UnityEngine.VFX.VFXValueType.SkinnedMeshRenderer;
var mesh = !skinnedMesh ? source : new VFXExpressionMeshFromSkinnedMeshRenderer(source);
foreach (var vertexAttribute in vertexAttributes)
{
var channelIndex = VFXValue.Constant <uint>((uint)vertexAttribute);
var meshVertexStride = new VFXExpressionMeshVertexStride(mesh, channelIndex);
var meshChannelOffset = new VFXExpressionMeshChannelOffset(mesh, channelIndex);
var outputType = GetOutputType(vertexAttribute);
VFXExpression sampled = null;
var meshChannelFormatAndDimension = new VFXExpressionMeshChannelInfos(mesh, channelIndex);
var vertexOffset = vertexIndex * meshVertexStride + meshChannelOffset;
if (!skinnedMesh)
{
if (vertexAttribute == VertexAttribute.Color)
{
sampled = new VFXExpressionSampleMeshColor(source, vertexOffset, meshChannelFormatAndDimension);
}
else if (outputType == typeof(float))
{
sampled = new VFXExpressionSampleMeshFloat(source, vertexOffset, meshChannelFormatAndDimension);
}
else if (outputType == typeof(Vector2))
{
sampled = new VFXExpressionSampleMeshFloat2(source, vertexOffset, meshChannelFormatAndDimension);
}
else if (outputType == typeof(Vector3))
{
sampled = new VFXExpressionSampleMeshFloat3(source, vertexOffset, meshChannelFormatAndDimension);
}
else
{
sampled = new VFXExpressionSampleMeshFloat4(source, vertexOffset, meshChannelFormatAndDimension);
}
}
else
{
if (vertexAttribute == VertexAttribute.Color)
{
sampled = new VFXExpressionSampleSkinnedMeshRendererColor(source, vertexOffset, meshChannelFormatAndDimension);
}
else if (outputType == typeof(float))
{
sampled = new VFXExpressionSampleSkinnedMeshRendererFloat(source, vertexOffset, meshChannelFormatAndDimension);
}
else if (outputType == typeof(Vector2))
{
sampled = new VFXExpressionSampleSkinnedMeshRendererFloat2(source, vertexOffset, meshChannelFormatAndDimension);
}
else if (outputType == typeof(Vector3))
{
sampled = new VFXExpressionSampleSkinnedMeshRendererFloat3(source, vertexOffset, meshChannelFormatAndDimension);
}
else
{
sampled = new VFXExpressionSampleSkinnedMeshRendererFloat4(source, vertexOffset, meshChannelFormatAndDimension);
}
}
yield return(sampled);
}
}
