cgSetParameter
Keywords: cgSetParameter, NVIDIA, NVIDIA Cg Toolkit, Cg Toolkit, Shader, Shader Programming, GPU Shader Programming, GPU Program

> ## Name

> cgSetParameter - sets the value of scalar and vector parameters

> ## Synopsis

>     #include <Cg/cg.h>

>     /* TYPE is int, float or double */

>     void cgSetParameter1{ifd}( CGparameter param,
>                                TYPE x );

>     void cgSetParameter2{ifd}( CGparameter param,
>                                TYPE x,
>                                TYPE y );

>     void cgSetParameter3{ifd}( CGparameter param,
>                                TYPE x,
>                                TYPE y,
>                                TYPE z );

>     void cgSetParameter4{ifd}( CGparameter param,
>                                TYPE x,
>                                TYPE y,
>                                TYPE z,
>                                TYPE w );

>     void cgSetParameter{1234}{ifd}v( CGparameter param,
>                                      const TYPE * v );

> ## Parameters

> param
>   The parameter that will be set.
> x, y, z, and w
>   The values to which to set the parameter.
> v
>   The values to set the parameter to for the array versions of the set functions.

> ## Return Values

> None.

> ## Description

> The cgSetParameter functions set the value of a given scalar or vector parameter. The functions are available in various combinations.

> Each function takes either 1, 2, 3, or 4 values depending on the function that is used. If more values are passed in than the parameter requires, the extra values will be ignored.

> There are versions of each function that take int, float or double values signified by the i, f or d in the function name.

> The functions with the v at the end of their names take an array of values instead of explicit parameters.

> Once cgSetParameter has been used to set a parameter, the values may be retrieved from the parameter using the CG_CURRENT enumerant with cgGetParameterValues.

> If an API-dependant layer of the Cg runtime (e.g. cgGL) is used, these entry points may end up making API (e.g. OpenGL) calls.

> Note: Previous releases of Cg allowed you to store more values in a parameter than indicated by the parameter's type. For example, one could use cgGLSetParameter4f to store four values into a parameter of type CG_FLOAT (not CG_FLOAT4). All four values could later be retrieved using a get call which requested more than one value. However, this feature conflicts with the GLSL approach and also leads to issues with parameters mapped into BUFFERS. Therefore, beginning with Cg 2.0 any components beyond the number indicated by the parameter type are ignored.

> ## Examples

> to-be-written

> ## Errors

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

> CG_INVALID_PARAMETER_ERROR is generated if param is a varying input to a fragment program.

> ## History

> The d and f versions of cgSetParameter were introduced in Cg 1.2.

> The i versions of cgSetParameter were introduced in Cg 1.4.

> ## See Also

> cgGetParameterValue