@vladislavbelov yesterday committed compute shader support, upscaling and downscaling techniques https://code.wildfiregames.com/D5218, I believe he might know more, maybe also @Stan` and @wowgetoffyourcellphone might know some tricks, but I believe for proper laser there will need to be added proper support in the engine.
Another question about a lower priority feature I asked about years ago, is there any way to properly implement a "laser beam" in the engine? There are quite a few units that are supposed to have what can be described as a laser beam attack and I've had to use less than ideal alternatives like a fireball.