private static BeginMode GetBeginMode(ExplicitModelPrimitiveTopology primitiveTopology)
{
switch (primitiveTopology)
{
case ExplicitModelPrimitiveTopology.PointList: return(BeginMode.Points);
case ExplicitModelPrimitiveTopology.LineList: return(BeginMode.Lines);
case ExplicitModelPrimitiveTopology.LineStrip: return(BeginMode.LineStrip);
case ExplicitModelPrimitiveTopology.TriangleList: return(BeginMode.Triangles);
case ExplicitModelPrimitiveTopology.TriangleStrip: return(BeginMode.TriangleStrip);
default: throw new ArgumentOutOfRangeException(nameof(primitiveTopology), primitiveTopology, null);
}
}
public static IExplicitModel FromVertices(IReadOnlyList <VertexPosTanNormTex> vertices, IReadOnlyList <int> indices, ExplicitModelPrimitiveTopology topology)
{
var positions = vertices.Select(x => x.Position).ToArray();
var model = new ExplicitModel(ResourceVolatility.Immutable)
{
Positions = positions,
Tangents = vertices.Select(x => x.Tangent).ToArray(),
Normals = vertices.Select(x => x.Normal).ToArray(),
TexCoords = vertices.Select(x => x.TexCoord).ToArray(),
Indices = indices?.ToArray() ?? Enumerable.Range(0, positions.Length).ToArray(),
IndexSubranges = new [] { new ExplicitModelIndexSubrange(0, indices?.Count ?? vertices.Count) },
Topology = topology,
};
model.RecalculateInfo();
model.Validate();
return(model);
}
