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I made a simplified disc blur example of this with GameMaker, here: github.com/XorDev/Bokeh...

Pow is relatively expensive, but you can do a gamma of 2.0 just by multiplying tex_rgb * tex_rgb and using one sqrt on the resulting average. It’s a good approximation for gamma 2.2 and much cheaper!

And if you have no idea what gamma correction is, I wrote about the topic in detail here: mini.gmshaders.com/p/gamma