private RenderGeometryCompression CompressVertexBuffer(VertexBufferDefinition vertexBuffer)
{
Debug.Assert(vertexBuffer.Format == VertexBufferFormat.Rigid);
var compression = new RenderGeometryCompression();
var rigidVertices = new List <RigidVertex>();
using (var stream = new MemoryStream(vertexBuffer.Data.Data))
{
var vertexStream = VertexStreamFactory.Create(DestCache.Version, stream);
for (int i = 0; i < vertexBuffer.Count; i++)
{
var vertex = vertexStream.ReadRigidVertex();
rigidVertices.Add(vertex);
}
}
var positions = rigidVertices.Select(v => v.Position);
var texCoords = rigidVertices.Select(v => v.Texcoord);
if (positions != null && positions.Count() > 0)
{
compression.X.Lower = Math.Min(compression.X.Lower, positions.Min(v => v.I));
compression.Y.Lower = Math.Min(compression.Y.Lower, positions.Min(v => v.J));
compression.Z.Lower = Math.Min(compression.Z.Lower, positions.Min(v => v.K));
compression.X.Upper = Math.Max(compression.X.Upper, positions.Max(v => v.I));
compression.Y.Upper = Math.Max(compression.Y.Upper, positions.Max(v => v.J));
compression.Z.Upper = Math.Max(compression.Z.Upper, positions.Max(v => v.K));
}
if (texCoords != null && texCoords.Count() > 0)
{
compression.U.Lower = Math.Min(compression.U.Lower, texCoords.Min(v => v.I));
compression.V.Lower = Math.Min(compression.V.Lower, texCoords.Min(v => v.J));
compression.U.Upper = Math.Max(compression.U.Upper, texCoords.Max(v => v.I));
compression.V.Upper = Math.Max(compression.V.Upper, texCoords.Max(v => v.J));
}
var compressor = new VertexCompressor(compression);
using (var outStream = new MemoryStream())
{
var outVertexStream = VertexStreamFactory.Create(DestCache.Version, outStream);
foreach (var vertex in rigidVertices)
{
vertex.Position = compressor.CompressPosition(vertex.Position);
vertex.Texcoord = compressor.CompressUv(vertex.Texcoord);
outVertexStream.WriteRigidVertex(vertex);
}
vertexBuffer.Data.Data = outStream.ToArray();
}
return(compression);
}
