/// <summary>
/// <para>Creates a vertex buffer that will map an array of float or vector primitives to a specified Vertex Usage and index</para>
/// </summary>
/// <param name="data"></param>
/// <param name="elementUsage"></param>
/// <param name="index"></param>
/// <returns></returns>
public static Vertices <VertexType> CreateSingleElementVertices(VertexType[] data, VertexElementUsage elementUsage, int index)
{
if (typeof(float) != typeof(VertexType) &&
typeof(Vector2) != typeof(VertexType) &&
typeof(Vector3) != typeof(VertexType) &&
typeof(Vector4) != typeof(VertexType) &&
typeof(Microsoft.Xna.Framework.Graphics.PackedVector.HalfVector2) != typeof(VertexType) &&
typeof(Microsoft.Xna.Framework.Graphics.PackedVector.HalfVector4) != typeof(VertexType))
{
throw new ArgumentException("Only float and vector types are supported for single element vertex buffers");
}
if (data == null)
{
throw new ArgumentNullException();
}
if (index >= 16 || index < 0)
{
throw new ArgumentException("index");
}
VertexElementFormat format = VertexDeclarationBuilder.DetermineFormat(typeof(VertexType));
VertexElement[] elements = new VertexElement[] { new VertexElement(0, 0, format, VertexElementMethod.Default, elementUsage, (byte)index) };
int stride = VertexElementAttribute.CalculateVertexStride(elements);
return(new Vertices <VertexType>(data, elements, stride));
}
public VertexDeclarationBuilder()
{
declarationMapping = new Dictionary <Type, VertexElement[]>();
typeHash = new Dictionary <Type, short>();
hashingDecl = new DeclarationHash(typeof(Vector3), typeHash, ref typeIndex); //static to keep from GC messing
Instance = this;
}
/// <summary>
/// Gets the size (in bytes) of a vertex element format
/// </summary>
/// <param name="format"></param>
/// <returns></returns>
public static int SizeOfFormatType(VertexElementFormat format)
{
return(VertexDeclarationBuilder.SizeOfFormatType(format));
}