public static Vertices <TVertexType> CreateSingleElementVertices(DeviceContext context, TVertexType[] data, DeclarationUsage elementUsage, int index)
{
if (typeof(float) != typeof(TVertexType) &&
typeof(Vector2) != typeof(TVertexType) &&
typeof(Vector3) != typeof(TVertexType) &&
typeof(Vector4) != typeof(TVertexType) &&
typeof(Half2) != typeof(TVertexType) &&
typeof(Half4) != typeof(TVertexType))
{
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");
}
DeclarationType format = VertexDeclarationBuilder.DetermineFormat(typeof(TVertexType));
VertexElement[] elements = new VertexElement[] { new VertexElement(0, 0, format, DeclarationMethod.Default, elementUsage, (byte)index) };
int stride = VertexElementAttribute.CalculateVertexStride(elements);
return(new Vertices <TVertexType>(context, data, elements, stride));
}
public static int CalculateVertexStride(VertexElement[] elements)
{
int stride = 0;
for (int i = 0; i < elements.Length; i++)
{
stride = Math.Max(stride, elements[i].Offset + VertexElementAttribute.SizeOfFormatType(elements[i].Type));
}
return(stride);
}
public static Vertices <TVertexType> CreateRawDataVertices(DeviceContext context, TVertexType[] data, VertexElement[] elements)
{
if (typeof(byte) != typeof(TVertexType))
{
throw new ArgumentException("Only byte[] raw vertices are supported at this time");
}
if (data == null || elements == null)
{
throw new ArgumentNullException();
}
if (elements.Length == 0)
{
throw new ArgumentException();
}
int stride = VertexElementAttribute.CalculateVertexStride(elements);
return(new Vertices <TVertexType>(context, data, elements, stride));
}
public VertexElement[] GetDeclaration(Type type)
{
lock (_declarationMapping)
{
VertexElement[] mapping;
if (_declarationMapping.TryGetValue(type, out mapping))
{
return(mapping);
}
if (type == typeof(Vector3)) //special case
{
mapping = new VertexElement[] { new VertexElement(0, 0, DeclarationType.Float3, DeclarationMethod.Default, DeclarationUsage.Position, 0) }
}
;
if (type == typeof(Vector4))
{
mapping = new VertexElement[] { new VertexElement(0, 0, DeclarationType.Float4, DeclarationMethod.Default, DeclarationUsage.Position, 0) }
}
;
if (mapping == null)
{
List <VertexElement> elements = new List <VertexElement>();
int offset = 0;
if (type.IsValueType == false)
{
throw new ArgumentException("Type " + type.Name + " is a not a ValueType (struct)");
}
foreach (FieldInfo f in type.GetFields(BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance))
{
if (!f.ReflectedType.IsValueType)
{
throw new ArgumentException("Field " + type.Name + "." + f.Name + " is a not a ValueType (struct)");
}
int size = Marshal.SizeOf(f.FieldType);
bool attribSet = false;
foreach (object o in f.GetCustomAttributes(true))
{
if (o is VertexElementAttribute)
{
VertexElementAttribute att = (VertexElementAttribute)o;
DeclarationType format = att.Type;
if (format == DeclarationType.Unused)
{
format = DetermineFormat(f);
}
else
{
int formatSize;
if (!_formatMappingSize.TryGetValue(format, out formatSize))
{
throw new ArgumentException(string.Format("Invlaid DeclarationType ({0}) specified in VertexElementAttribute for {1}.{2}", format, type.FullName, f.Name));
}
if (formatSize != Marshal.SizeOf(f.FieldType))
{
throw new ArgumentException(string.Format("DeclarationType size mismatch in {4}.{5}, {0} requires a size of {1}, specified type {2} has size {3}", format, formatSize, f.FieldType.FullName, Marshal.SizeOf(f.FieldType), type.FullName, f.Name));
}
}
elements.Add(new VertexElement(0, (short)offset, format, DeclarationMethod.Default, att.Usage, (byte)att.Index));
attribSet = true;
break;
}
}
if (!attribSet)
{
DeclarationType format = DetermineFormat(f);
int index;
DeclarationUsage usage = DetermineUsage(elements, f, out index);
elements.Add(new VertexElement(0, (short)offset, format, DeclarationMethod.Default, usage, (byte)index));
}
offset += size;
}
elements.Add(VertexElement.VertexDeclarationEnd);
mapping = elements.ToArray();
}
_declarationMapping.Add(type, mapping);
return(mapping);
}
}
