> ## Name

> cgGetParameterBufferIndex - get buffer index by parameter

> ## Synopsis

>     #include <Cg/cg.h>

>     int cgGetParameterBufferIndex( CGparameter param );

> ## Parameters

> param
>   The parameter for which the associated buffer index will be retrieved.

> ## Return Values

> Returns the index for the buffer to which param belongs.

> Returns -1 if param does not belong to a buffer or an error occurs.

> ## Description

> cgGetParameterBufferIndex returns the index for the buffer to which a parameter belongs. If param does not belong to a buffer, then -1 is returned.

> If the program to which param belongs is in an uncompiled state, it will be compiled by cgGetParameterBufferIndex. See cgSetAutoCompile for more information about program compile states.

> ## Examples

>       int index = cgGetParameterBufferIndex( myParam );

> ## Errors

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

> ## History

> cgGetParameterBufferIndex was introduced in Cg 2.0.

> ## See Also

> cgSetProgramBuffer, cgGetParameterBufferOffset, cgGetParameterResourceSize, cgSetAutoCompile