Static parallax wallpaper

[Weathercold]

Support parallax with static wallpaper and optionally multiple layers. How I imagine it'd work is that each layer has a scroll margin, aka the number of pixels available for scrolling. The parallax starts and ends at the edges of the bounding box of all non-widget windows, which means that the parallax speed depends on the size of the active part of the canvas. Basically, like hyprlax, but the parallax is 2D.

If you find that this feature is too heavy, I could submit a request to hyprlax to support DriftWM instead

[malbiruk]

Static parallax already works, single layer: there's a shipped shader for it, extras/wallpapers/textured/mirrored_parallax.glsl (installed under /usr/local/share/driftwm/wallpapers/textured/). Point it at any image with texture = ... and set the depth factor at the top of the file. There's an example in the gallery:
#143 (comment)

It's single layer because a shader background can bind only one texture right now. Multiple textures would be the missing piece for layered parallax. The per-layer factor would stay a constant, not tied to the windows' bounding box, since that box moves whenever a window opens or closes.

If you'd rather go the hyprlax route, that works too: type = "none" hands the wallpaper to a layer-shell client, and driftwm msg subscribe streams camera changes live.

[Weathercold]

Mirrored parallax is still tiling. I'm referring to non-tiling parallax the way it's done on android and iOS. The wallpaper never tiles, it just scrolls slower as the canvas grows.

[malbiruk]

Yes, that one is tiling, but it can be modified: swap the wrap for a clamp so it stops at the image edge, and put the range as
a constant at the top (a few screens wide). Then the image covers the screen once and its spare width spreads across that range, like on a phone.

The range has to be a constant for now since shaders don't know where the windows are. Once #183 adds a canvas size I might pass that rect to shaders. Still single layer until shaders can take more than one texture.