Hi Vlad Serhiienko,
I reached out via google hangouts, but I figured this was a better mechanism. I found your project by via my quest to get Nuklear and BGFX working together. I recently wrote bindings for Nuklear for the Nim programming language, and bindings already exist for Nim to BGFX so I'm writing everything in Nim.
I've ported most of your SDL / BGFX / Nuklear example to Nim but it is NOT working for me. I'm ending up with this - http://imgur.com/a/8QC2C
I know my bindings work, as I've ported some of the OpenGL3 / GLFW3 demos from the nuklear repo to Nim.
My question is - does your example work or is it still a WIP? If so I'm doing something wrong. If it doesn't yet work - maybe we can work together and try to get it working?
I haven't tried checking out and compiling your project yet, as I don't do much C++ work (only C and Nim) but I may end up doing that next if all else fails.
Thanks for your time Vlad!
-Zach