add support for `kacau-wall`

[AndrielFR]

kacau-wall is a project of mine, which can be summarized as a brand-new GPU-accelerated wallpaper engine.

fully Linux/Wayland native written in pure Rust, it has some background kinds, namely: videos (vk-video for optimize files, a.k.a .h264 files, and ffmpeg for all the rest), images, hex color and shader (glsl/wgsl).

currently i'm rewriting it to use my own reactive widget framework, which i haven't added shader support to this new version yet, altough it's more optimized than the older version.

old version: https://codeberg.org/touto/kacau/src/branch/master/kacau-wall
new version: https://codeberg.org/touto/awf/src/branch/rewrite/apps/kacau-wall

it has support for visual effects (rain, snowflakes, vhs, glitch, ...), transitions (many kinds) and cursor-tracking effects (parallax, spotlight, ...).
i plan to add support for custom shader effects/transitions too.

low resources usage:

• cpu: 0% with only images and ~3 running videos (effects increase ~0.4%)
• ram: images: ~80MB, videos: variates, 1080P at 45fps uses ~120MB with optimized (pure H264) through vk-video and ~180MB with non-optimized ones (e.g., MP4, MKV) through ffmpeg on my pc (ryzen 7 5700u).
• gpu: ~30% (integrated)

i'm free to answer any questions and willing to make a PR if needed to

[0bCdian]

I'll check it out and start working on it as soon as possible. Shouldn't take me long to include a basic form of support it. I'll ask around for some context if I need it and ask you for feedback / review once I land the feature on a dev branch before merging it to main. Thanks for checking out my project.

[AndrielFR]

I'll check it out and start working on it as soon as possible. Shouldn't take me long to include a basic form of support it. I'll ask around for some context if I need it and ask you for feedback / review once I land the feature on a dev branch before merging it to main. Thanks for checking out my project.

thank you for the reply! i'll look forward to it

i already added custom shader support (you can try some from shadertoy) and made a "scene" system like the one wallpaper engine from steam has, you create a folder or zip file (.kscene ext) with a file named scene.toml or manifest.toml inside it which is where you'll say where the shader file is, and which channels (like additional textures) there are and where they're located.
i'll make a section about it in the readme later on.