GlTextureSubImage1DEXT typedef
        GlTextureSubImage1DEXT =
     void Function(int texture, int target, int level, int xoffset, int width, int format, int type, Pointer<NativeType>  pixels)
    
    
    
Implementation
typedef GlTextureSubImage1DEXT = void Function(int texture, int target,
    int level, int xoffset, int width, int format, int type, Pointer pixels);