/// <summary>
/// Initializes a new instance of the <see cref="VertexDeclaration"/> class.
/// </summary>
/// <param name="elements">The elements that compose a vertex.</param>
/// <param name="instanceCount">The instance count.</param>
/// <param name="vertexStride">The vertex stride, in bytes. Specify 0 to compute the stride from <paramref name="elements"/>.</param>
/// <exception cref="System.ArgumentNullException"><paramref name="elements"/> is a <c>null</c> reference.</exception>
public VertexDeclaration(VertexElement[] elements, int instanceCount, int vertexStride)
{
if (elements is null)
{
throw new ArgumentNullException(nameof(elements));
}
VertexElements = elements;
VertexStride = vertexStride == 0 ? VertexElementValidator.GetVertexStride(elements) : vertexStride;
InstanceCount = instanceCount;
// Validate vertex declaration elements
VertexElementValidator.Validate(VertexStride, VertexElements);
hashCode = InstanceCount;
hashCode = (hashCode * 397) ^ VertexStride;
foreach (var vertexElement in VertexElements)
{
hashCode = (hashCode * 397) ^ vertexElement.GetHashCode();
}
}
/// <summary>
/// Initializes a new instance of the <see cref="VertexDeclaration"/> class.
/// </summary>
/// <param name="elements">The elements.</param>
/// <param name="instanceCount">The instance count.</param>
/// <param name="vertexStride">The vertex stride.</param>
/// <exception cref="System.ArgumentNullException">elements</exception>
public VertexDeclaration(VertexElement[] elements, int instanceCount, int vertexStride)
{
if (elements == null)
{
throw new ArgumentNullException("elements");
}
this.elements = elements;
this.vertexStride = vertexStride == 0 ? VertexElementValidator.GetVertexStride(elements) : vertexStride;
this.instanceCount = instanceCount;
// Validate Vertices
VertexElementValidator.Validate(VertexStride, elements);
hashCode = instanceCount;
hashCode = (hashCode * 397) ^ vertexStride;
foreach (var vertexElement in elements)
{
hashCode = (hashCode * 397) ^ vertexElement.GetHashCode();
}
}