/// <summary>
/// Initializes a new instance of the OpenGLIndexBuffer.
/// </summary>
/// <param name="uv">The Ultraviolet context.</param>
/// <param name="itype">The index element type.</param>
/// <param name="icount">The index element count.</param>
/// <param name="usage">The buffer's usage type.</param>
public OpenGLIndexBuffer(UltravioletContext uv, IndexBufferElementType itype, Int32 icount, UInt32 usage)
: base(uv, itype, icount)
{
Contract.EnsureRange(icount >= 0, nameof(icount));
this.usage = usage;
this.size = new IntPtr(GetElementSize() * icount);
var buffer = 0u;
uv.QueueWorkItem(state =>
{
using (OpenGLState.ScopedCreateElementArrayBuffer(out buffer))
{
gl.NamedBufferData(buffer, gl.GL_ELEMENT_ARRAY_BUFFER, size, null, usage);
gl.ThrowIfError();
}
}).Wait();
this.buffer = buffer;
}