Tiles show pixels from neighboring tiles when moving

[p-himik]

For example, open the Super Koalio game.
You'll see clouds like this one (don't pay attention to the top and right semitransparent borders - those are in the tileset itself, neighboring tiles are "leaking" a bit):

If you move a bit horizontally, you'll see some clouds shown like this:

Notice the green border on the right - it comes from the green ground tile in the tileset.
It keep flickering when the character moves.

And if you resize the window vertically, you can see clouds like this:

Notice the brown border at the top - again, it comes from the tileset, from the tiles above the cloud.

It works the same in both Chrome and Firefox, so I suspect the cause is somewhere in the code.

[keychera]

I have this issue as well in my game and from what I've learned it is caused by WebGL have a default config to store alpha values in the backbuffer

according to this article, OpenGL does not behave that way (and the author argues `false1 should have been the default)
https://webgl2fundamentals.org/webgl/lessons/webgl-and-alpha.html

in play-cljc, it should be defined in start.cljs

(defonce context
  (let [canvas (js/document.querySelector "canvas")
        context (.getContext canvas "webgl2" (clj->js {:alpha false}))  ;; tell WebGL to not use backbuffer for Alpha values
        initial-game (assoc (pc/->game context)
                            :delta-time 0
                            :total-time (msec->sec (js/performance.now)))]
; ...
  )

also regarding leaky texture from neighboring tiles, adding padding to the original texture atlas should have solved it.