/// <summary>
/// Get an element from this mapped BufferObject.
/// </summary>
/// <typeparam name="T">
/// A structure representing this BufferObject element.
/// </typeparam>
/// <param name="index">
/// A <see cref="uint"/> that specify the index of the element to get.
/// </param>
/// <param name="sectionIndex">
/// A <see cref="uint"/> that specifies the array section index for supporting packed/interleaved arrays.
/// </param>
/// <returns>
/// It returns a structure of type <typeparamref name="T"/>, read from the mapped BufferObject
/// </returns>
/// <exception cref="InvalidOperationException">
/// Exception thrown if this BufferObject is not mapped (<see cref="Buffer.IsMapped"/>).
/// </exception>
public T GetElement <T>(uint index, uint sectionIndex) where T : struct
{
IArraySection arraySection = GetArraySection(sectionIndex);
uint stride = arraySection.Stride != IntPtr.Zero ? (uint)arraySection.Stride.ToInt32() : ItemSize;
ulong itemOffset = (ulong)arraySection.Offset.ToInt64() + stride * index;
return(Get <T>(itemOffset));
}
/// <summary>
/// Set an element to this mapped ArrayBufferObjectBase.
/// </summary>
/// <typeparam name="T">
/// A structure representing this ArrayBufferObjectBase element.
/// </typeparam>
/// <param name="value">
/// A <typeparamref name="T"/> that specify the mapped BufferObject element.
/// </param>
/// <param name="index">
/// A <see cref="uint"/> that specify the index of the element to set.
/// </param>
/// <param name="sectionIndex">
/// A <see cref="uint"/> that specifies the array section index for supporting packed/interleaved arrays.
/// </param>
/// <exception cref="InvalidOperationException">
/// Exception thrown if this BufferObject is not mapped (<see cref="IsMapped"/>).
/// </exception>
public void SetElement <T>(T value, uint index, uint sectionIndex) where T : struct
{
IArraySection arraySection = GetArraySection(sectionIndex);
uint stride = arraySection.Stride != IntPtr.Zero ? (uint)arraySection.Stride.ToInt32() : ItemSize;
ulong itemOffset = (ulong)arraySection.Offset.ToInt64() + stride * index;
Set(value, itemOffset);
}
