Just want to know if you are planning to rewrite stuff to handle shaders for android, I understood it's a lot a work and backward compatibility breaking so maybe for SFML 3. ?
We have decided against changing the underlying OpenGL implementation for SFML 3, as it would require an additional massive overhaul. The goal of SFML 3 is to catapult the library into the C++17 era.
Can I fork SFML and do it for my personal use ? Does it seems relatively doable (I mean, will it be faster to wait for you to do it)?
You
can fork it and do any changes you want, whether you have the capabilities to achieve it, I cannot judge.
There is already this project https://github.com/TheMaverickProgrammer/SFML_ANDROID_ES_2 which is a fork of 2.5.1 and use gles2. If I fork from 2.6., will the work be different ?
I'd assume so, as SFML 2.6.0 and SFML 2.5.1 aren't different w.r.t. graphics, but I don't know what all the changes were.