PFNGLMAPBUFFERRANGEPROCDart typedef
        PFNGLMAPBUFFERRANGEPROCDart =
     Pointer<NativeType>  Function(int target, Pointer<NativeType>  offset, Pointer<Uint32>  length, int access)
    
    
    
Implementation
typedef PFNGLMAPBUFFERRANGEPROCDart =
    Pointer<NativeType> Function(
      int target,
      Pointer<NativeType> offset,
      Pointer<Uint32> length,
      int access,
    );