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Code Packages Releases Activity

shader-based scrolling wallpaper mode (#1802)

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* feat: parallax-scroll wallpaper

Add a `Scrolling` wallpaper fill mode that translates the wallpaper crop
with the active workspace — like Android home-screen parallax, but along
niri's vertical workspace axis.

The image is scaled to cover the screen on its non-scroll axis, and the
active workspace index drives a fractional offset into the cropped
overflow along the scroll axis. Scroll position is spring-animated
CPU-side and handed to a minimal single-texture shader as a UV offset.
Per-monitor scroll position is published into SessionData so the lock
screen renders the same crop as the active workspace, keeping visual
continuity across lock/unlock.

Two implementation details worth calling out for review:

- QSG_USE_SIMPLE_ANIMATION_DRIVER=1 is exported to the spawned quickshell
  process. The default animation driver advances in fixed ~16ms steps,
  capping the scroll at 60Hz and desyncing it from compositor motion on
  high-refresh displays; the simple driver advances by real elapsed time,
  restoring native-refresh pacing. Removing it visibly regresses to 60Hz.

- The wallpaper survives wl_output rebind cycles (e.g. OLED image-cleaning
  on DPMS soft-off), which otherwise leave a stuck or void background.
  Recovery re-anchors the scroll target on output-lifecycle signals,
  rebuilds the ShaderEffect against the current render context, and
  re-attaches the wallpaper-layer surface on unlock for parallax-active
  monitors — guarded against lock state so the shader gets reliable frame
  hints.

* simplify bindings and gate lock screen shader in a loader

---------

Co-authored-by: bbedward <bbedward@gmail.com>
This commit is contained in:
hecate cantus
2026-06-23 21:14:42 -07:00
committed by GitHub
parent aea5189abb
commit 1a39b7f66c
10 changed files with 590 additions and 20 deletions
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core/cmd/dms/shell.go
+6
View File
@@ -225,6 +225,9 @@ func runShellInteractive(session bool) {
if os.Getenv("QT_QPA_PLATFORM") == "" {
cmd.Env = append(cmd.Env, "QT_QPA_PLATFORM=wayland;xcb")
}
if os.Getenv("QSG_USE_SIMPLE_ANIMATION_DRIVER") == "" {
cmd.Env = append(cmd.Env, "QSG_USE_SIMPLE_ANIMATION_DRIVER=1")
}
cmd.Env = appendLogEnv(cmd.Env)
@@ -477,6 +480,9 @@ func runShellDaemon(session bool) {
if os.Getenv("QT_QPA_PLATFORM") == "" {
cmd.Env = append(cmd.Env, "QT_QPA_PLATFORM=wayland;xcb")
}
if os.Getenv("QSG_USE_SIMPLE_ANIMATION_DRIVER") == "" {
cmd.Env = append(cmd.Env, "QSG_USE_SIMPLE_ANIMATION_DRIVER=1")
}
cmd.Env = appendLogEnv(cmd.Env)