Sun Flares – UPBGE / BGE Blend file
From Blenderartists, adriansnetlis wrote :
Hi! youle did recently convert this to BGE 2D Filter system. I fixed several issues and improved it.
Use mouse to look around. In the script you can adjust sun scale threshold to change size of sun(the bigger the number, the smaller sun).
Grab the blend file here.
Link to the forum post here