# Building VTK-9 with Emscripten+GLES for rendering

**URL:** https://discourse.vtk.org/t/building-vtk-9-with-emscripten-gles-for-rendering/3038
**Category:** Development
**Created:** [April 13, 2020, 5:28pm UTC](https://discourse.vtk.org/t/building-vtk-9-with-emscripten-gles-for-rendering/3038 "2020-04-13T17:28:50Z")
**Posts on this page:** 1
**Showing post:** 5

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### Author: ![Sebastien\_Jourdain](https://discourse.vtk.org/user_avatar/discourse.vtk.org/sebastien_jourdain/32/100_2.png) [@Sebastien\_Jourdain](https://discourse.vtk.org/u/Sebastien_Jourdain)
#### Post date: [April 14, 2020, 11:53am UTC](https://discourse.vtk.org/t/building-vtk-9-with-emscripten-gles-for-rendering/3038/5 "2020-04-14T11:53:29Z")

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Hey Brad,

My understanding (which might be wrong) is that as soon as I provide a GLES library, I don’t necessary need the OpenGL one (probably only true for iOS and Emscripten builds). It means that OpenGL is given to me by the GLES one while having a more limited API (The GL code should have some ifdef with GLES so slightly different path could be taken inside the GL code).

@ken-martin might be able to provide more context on that aspect.

Thanks Brad for looking into that,

Seb

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