Bloom Effect in 'Elephant's Dream'?

I want to make a bloom effect like the one from ‘Elephant’s Dream’ but I have no idea how it was made. My ideal is to create one like a game bloom (Half-Life 2). :frowning: So far I’ve looked on Google and found some pictures from this one post, but I’m still searching for other formulae before I arrive to a conclusion. Do you have any suggestions I might find useful? What’s the best way to achieve a GLSL glow like in the Blender game engine? br/Thanks in advance!/br