> ## Name

> cgGetDependentStateAssignmentParameter - get one of the parameters that a state assignment's value depends on

> ## Synopsis

>     #include <Cg/cg.h>

>     CGparameter cgGetDependentStateAssignmentParameter( CGstateassignment sa,
>                                                         int index );

> ## Parameters

> sa
>   The state assignment handle.
> index
>   The index of the parameter to return.

> ## Return Values

> Returns a handle to the selected dependent parameter on success.

> Returns NULL if an error occurs.

> ## Description

> State assignments in CgFX files may include references to one or more effect parameters on the right hand side of the state assignment that are used for computing the state assignment's value. cgGetDependentStateAssignmentParameter returns one of these parameters, as indicated by the given index. cgGetNumDependentStateAssignmentParameters can be used to determine the total number of such parameters.

> This information can be useful for applications that wish to cache the values of annotations so that they can determine which annotations may change as the result of changing a particular parameter's value.

> ## Examples

> to-be-written

> ## Errors

> CG_INVALID_STATE_ASSIGNMENT_HANDLE_ERROR is generated if sa is not a valid state assignment.

> CG_OUT_OF_ARRAY_BOUNDS_ERROR is generated if index is less than zero or greater than or equal to the number of dependent parameters, as returned by cgGetNumDependentStateAssignmentParameters.

> ## History

> cgGetDependentStateAssignmentParameter was introduced in Cg 1.4.

> ## See Also

> cgGetDependentAnnotationParameter, cgGetNumDependentStateAssignmentParameters