NAME
    cgGetParameterVariability - get a parameter's variability

SYNOPSIS
      #include <Cg/cg.h>

      CGenum cgGetParameterVariability( CGparameter param );

PARAMETERS
    param   The program parameter.

RETURN VALUES
    Returns the variability of param.

    Returns CG_ERROR if an error occurs.

DESCRIPTION
    cgGetParameterVariability allows the application to retrieve the
    variability of a parameter in a Cg program. This variability is
    necessary for the application to be able to supply the program's inputs
    and use the program's outputs.

    cgGetParameterVariability will return one of the following
    variabilities:

    CG_VARYING
        A varying parameter is one whose value changes with each invocation
        of the program.

    CG_UNIFORM
        A uniform parameter is one whose value does not change with each
        invocation of a program, but whose value can change between groups
        of program invocations.

    CG_LITERAL
        A literal parameter is folded out at compile time. Making a uniform
        parameter literal with cgSetParameterVariability will often make a
        program more efficient at the expense of requiring a compile every
        time the value is set.

    CG_CONSTANT
        A constant parameter is never changed by the user. It's generated by
        the compiler by certain profiles that require immediate values to be
        placed in certain resource locations.

    CG_MIXED
        A structure parameter that contains parameters that differ in
        variability.

EXAMPLES
    *to-be-written*

ERRORS
    CG_INVALID_PARAM_HANDLE_ERROR is generated if param is not a valid
    parameter.

HISTORY
    cgGetParameterVariability was introduced in Cg 1.1.

SEE ALSO
    the cgGetNamedParameter manpage, the cgGetNextParameter manpage, the
    cgGetParameterName manpage, the cgGetParameterType manpage, the
    cgGetParameterDirection manpage, the cgGetParameterBinding manpage, the
    cgGetParameterDirectionalBinding manpage, the cgIsArray manpage, the
    cgSetParameterVariability manpage

