# OpenGL calls in native extension? **URL:** \ **Category:** Questions\ **Created:** [November 18, 2018, 11:25pm UTC](https://forum.defold.com/t/opengl-calls-in-native-extension/35225 "2018-11-18T23:25:31Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![dangrnoodl](https://forum-defold.b-cdn.net/user_avatar/forum.defold.com/dangrnoodl/32/11808_2.png) [@dangrnoodl](https://forum.defold.com/u/dangrnoodl)\ **Post date:** [November 18, 2018, 11:25pm UTC](https://forum.defold.com/t/opengl-calls-in-native-extension/35225/1 "2018-11-18T23:25:31Z")
Is it possible to get access to retrieving texture ids from a native extension and use open gl calls on it? I’m working on a custom lighting and shadowing system and I need to upload a fair bit of data to the gpu, it wouldn’t be feasible with the currently exposed render script pipeline. ---
**Author:** ![Mathias\_Westerdahl](https://forum-defold.b-cdn.net/user_avatar/forum.defold.com/mathias_westerdahl/32/228_2.png) [@Mathias\_Westerdahl](https://forum.defold.com/u/Mathias_Westerdahl)\ **Post date:** [November 28, 2018, 9:18am UTC](https://forum.defold.com/t/opengl-calls-in-native-extension/35225/2 "2018-11-28T09:18:14Z")
It’s currently not possible no. You _can_ create your own OpenGL device to create/use your own textures, but communicating them back to the engine via Lua and resource.set\_texture(), but it’s not extremely performant. We will discuss this further in the engine to decide upon a good way forward, but it will take some time and it not likely to happen soon. ---
**Author:** ![sergey.lerg](https://forum-defold.b-cdn.net/user_avatar/forum.defold.com/sergey.lerg/32/3970_2.png) [@sergey.lerg](https://forum.defold.com/u/sergey.lerg)\ **Post date:** [November 28, 2018, 9:34am UTC](https://forum.defold.com/t/opengl-calls-in-native-extension/35225/3 "2018-11-28T09:34:31Z")
At the moment you can guess texture id, its not pretty, but it will allow you to experiment until a better way is implemented. Try numbers from 1 to 10 and see what happens.