Lighting becomes "blocky" under certain conditions

[braboware]

Not entirely sure what causes it but often when the camera gets close to a light source a blocky outline of the light can be seen. It should have something to do with the affine mapping POSITION /= abs(POSITION.w); line because I removed the rest of the shader and the blocky effect remains until I comment it out.

Interestingly you can also get the effect with the default godot shader if you crank the light's attenuation to some crazy values so maybe that'll give some clues as to what's going on

I have an example project that shows both
godot-psx blocky lighting.zip

[MenacingMecha]

Hmm. I mean if it also happens with the default shader with extreme settings, I think we can safely classify this as an engine bug.

I'm not sure what's causing this, or what/if can be done on my end - so for now I think this just needs to be left open. I will say these shaders aren't designed with playing nicely with real time lighting in mind, so some level of jank is always to be expected.

Thank you for the detailed reproduction scene, also.