public static int GetPrimitiveSize(PrimitiveType primitive)
{
switch (primitive)
{
case PrimitiveType.LineList: return(IndexLine.GetSizeInShortInts());
case PrimitiveType.PointList: return(IndexPoint.GetSizeInShortInts());
case PrimitiveType.TriangleList: return(IndexTriangle.GetSizeInShortInts());
default: break;
}
return(IndexTriangle.GetSizeInShortInts());
}
// A helper function, analogous to ProcessFaces.
private void ProcessPoints(RenderingPassBufferStorage bufferStorage)
{
var points = bufferStorage.Points;
if (points.Count == 0)
{
return;
}
// Edges are encoded as line segment primitives whose vertices contain only position information.
bufferStorage.FormatBits = VertexFormatBits.PositionColored;
//int edgeVertexBufferSizeInFloats = VertexPosition.GetSizeInFloats() * bufferStorage.VertexBufferCount;
int vertexBufferSizeInFloats = VertexPositionColored.GetSizeInFloats() * bufferStorage.VertexBufferCount;
int numPoints = points.Count;
bufferStorage.VertexBuffer = new VertexBuffer(vertexBufferSizeInFloats);
bufferStorage.VertexBuffer.Map(vertexBufferSizeInFloats);
var vertexStream = bufferStorage.VertexBuffer.GetVertexStreamPositionColored();
for (int i = 0; i < numPoints; i++)
{
var pointInfo = points[i];
var vertex = pointInfo.Vertex;
vertexStream.AddVertex(new VertexPositionColored(vertex + pointInfo.Offset, pointInfo.Color));
}
bufferStorage.VertexBuffer.Unmap();
bufferStorage.IndexBufferCount = bufferStorage.PrimitiveCount * IndexPoint.GetSizeInShortInts();
int indexBufferSizeInShortInts = 1 * bufferStorage.IndexBufferCount;
bufferStorage.IndexBuffer = new IndexBuffer(indexBufferSizeInShortInts);
bufferStorage.IndexBuffer.Map(indexBufferSizeInShortInts);
{
IndexStreamPoint indexStream = bufferStorage.IndexBuffer.GetIndexStreamPoint();
for (int i = 0; i < numPoints; i++)
{
indexStream.AddPoint(new IndexPoint(i));
}
}
bufferStorage.IndexBuffer.Unmap();
bufferStorage.VertexFormat = new VertexFormat(bufferStorage.FormatBits);
bufferStorage.EffectInstance = new EffectInstance(bufferStorage.FormatBits);
}
static IndexBuffer IndexPointsBuffer(int pointsCount)
{
Debug.Assert(pointsCount <= VertexThreshold);
if (indexPointsBuffer == null)
{
indexPointsBuffer = new IndexBuffer(VertexThreshold * IndexPoint.GetSizeInShortInts());
indexPointsBuffer.Map(VertexThreshold * IndexPoint.GetSizeInShortInts());
using (var istream = indexPointsBuffer.GetIndexStreamPoint())
{
for (int vi = 0; vi < VertexThreshold; ++vi)
{
istream.AddPoint(new IndexPoint(vi));
}
}
indexPointsBuffer.Unmap();
}
Debug.Assert(indexPointsBuffer.IsValid());
return(indexPointsBuffer);
}
