Match Render Resolution to Viewport Size

[athyfr]

With the viewport able to zoom in and out, pan, be resized (along with the window), etc. I wonder if the underlying variables are exposed.

Those variables could then easily be plugged in (by the user) to the target resolution, and anywhere else if needed. This might make testing certain types of fragment shaders easier, as well as absorb some of the use-case of FragM.

Are those variables exposed as of now?