PFNGLMULTITEXGENFVEXTPROCDart typedef
        PFNGLMULTITEXGENFVEXTPROCDart =
     void Function(int texunit, int coord, int pname, Pointer<Float>  params)
    
    
    
Implementation
typedef PFNGLMULTITEXGENFVEXTPROCDart =
    void Function(int texunit, int coord, int pname, Pointer<Float> params);