/// <summary>
/// Creates an uniform parameter.
/// </summary>
/// <param name="fmt">The format of parameter.</param>
/// <param name="size">The size of array, 0 means no array.</param>
/// <param name="bufferID">The constant buffer ID.</param>
/// <param name="placementInBuffer">The placement inside constant buffer.</param>
/// <returns>The actual input.</returns>
public Operand CreateConstant(PinFormat fmt, uint size,
uint bufferID, uint placementInBuffer)
{
int name = GenerateNextUniqueName();
// We first "create" variable at global scope.
compiler.RegisterConstant(name, fmt, size, bufferID, placementInBuffer);
// Returns the input element that can be used in operations.
return(new Operand(fmt, name, size, false));
}