Name
cgIsParameterReferenced - determine if a program parameter is potentially referenced
Synopsis
#include <Cg/cg.h> CGbool cgIsParameterReferenced( CGparameter param );Parameters
- param
- The handle of the parameter to check.
Return Values
Returns CG_TRUE if param is a program parameter and is potentially referenced by the program.
Returns CG_FALSE otherwise.
Description
cgIsParameterReferenced returns CG_TRUE if param is a program parameter, and is potentially referenced (used) within the program. It otherwise returns CG_FALSE.
Program parameters are those parameters associated directly with a CGprogram, whose handles are retrieved by calling, for example, cgGetNamedProgramParameter.
The value returned by cgIsParameterReferenced is conservative, but not always exact. A return value of CG_TRUE indicates that the parameter may be used by its associated program. A return value of CG_FALSE indicates that the parameter is definintely not referenced by the program.
If param is an aggregate program parameter (a struct or array), CG_TRUE is returned if any of param's children are potentially referenced by the program.
If param is a leaf parameter and the return value is CG_FALSE, cgGetParameterResource may return CG_INVALID_VALUE for this parameter.
Examples
to-be-written
Errors
CG_INVALID_PARAM_HANDLE_ERROR is generated if param is not a valid parameter.
History
cgIsParameterReferenced was introduced in Cg 1.1.
See Also
cgGetNamedProgramParameter, cgIsParameterUsed, cgGetParameterResource