Logic behind OBSBasic::RenderMain()

[Michael9792]

Hi, I'm quite interested in obs project and now I'm reading the source code of the project. I think OBSBasic::RenderMain() in window-basic-main.cpp is an important function because it makes the preview window display some sources. Now I'm a little bit confused about the basic logic of how you realize these amazing functions.
I found a lot of sub-functions begin with 'gs' but didn't know the basic principle behind them.(about vertex, projections etc.)
Could you please give me any suggestion about books or websites that I can refer to?
Great thanks!

 

[dodgepong]

I recommend reading the Development Guide here: https://obsproject.com/wiki/Getting-Started-with-OBS-Studio-Development