More efficient rendering of canvas effects (lights)

[Codas]

This is probably not worth it after initial testing.

If at all, this probably has to be done as a specialized batch shader for each lighting animation, making sure not to exceed the vertex size limit of certain hardware.
Only changing values (used for animating, like intensity, pulse, ratio, ...) should be stored in a data texture.
Everything else should be grouped and batched together. Better to switch shaders between drawings than to do 10 or more texture lookups in the fragment shader for the data packets

[Codas]

Turns out batched shaders don't help as much as I thought and the modifications to the shaders are quite substantial.
If foundry decides to do it natively, that might be worth it in some cases. It's probably not worth to hack into the rendering pipeline