PFNGLMULTITEXENVIVEXTPROCDart typedef
        PFNGLMULTITEXENVIVEXTPROCDart =
     void Function(int texunit, int target, int pname, Pointer<Int32>  params)
    
    
    
Implementation
typedef PFNGLMULTITEXENVIVEXTPROCDart =
    void Function(int texunit, int target, int pname, Pointer<Int32> params);