Anti aliasing

[expenses]

Related to https://github.com/expenses/mateversum/issues/28.

I was trying out VR with a headset connected to a poertful gpu and noticed that the flickering from aliasing was quite bad. The regular, hardware based approach to anti aliasing is to use multisampled anti aliasing. Unfortunately we can only multisample (in WebGL) if:

• we're rendering objects directly to the device framebuffer
• OR if we're the Oculus webgl multisampling extension: https://developer.oculus.com/documentation/web/web-multiview/#using-multiview-in-webgl-20 (only implemented in the Oculus browser).

This unfortunately leaves out GPUs that are rendering to a HDR framebuffer for things like bloom. A solution here might be to use a shader-based anti aliasing method like fxaa (or txaa?)

Additionally it's worth mentioning that resolving a multisampled hdr framebuffer has some requirements to allow for better edges. See https://mynameismjp.wordpress.com/2012/10/24/msaa-overview/. Also discussed for bevy: https://github.com/bevyengine/bevy/pull/3425.

[expenses]

Godot TAA implementation: https://github.com/godotengine/godot/commit/5ebdfc31b290e8bf42c387ad7b2f65c4c45c7853