dwm 6.8 pointerlock patch

2 files changed, 69 insertions, 0 deletions

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..7f32fd8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,31 @@
+# pointerlock
+
+## Description
+
+This patch keeps focus on a fullscreen client when the mouse pointer crosses
+a monitor edge. It applies to dwm 6.8.
+
+By default, `enternotify()` and `motionnotify()` change the selected monitor
+and focus whenever the pointer moves onto another monitor, so a fullscreen
+game loses focus from mouse movement alone. With this patch both handlers
+return early while a fullscreen client is selected. Keyboard focus changes,
+tag switching and `focusmon` still work.
+
+## Configuration
+
+The patch uses the existing `lockfullscreen` option in `config.h`. Set it to
+0 to disable the behaviour. No new options are added.
+
+## Testing
+
+Applies and builds against dwm 6.8. Runtime testing of the monitor crossing is
+pending; Xvfb would not provide two distinct Xinerama head positions on the
+development machine.
+
+## Download
+
+* [dwm-pointerlock-6.8.diff](dwm-pointerlock-6.8.diff)
+
+## Author
+
+* Daniel Guihot - [daniel@guihot.net](mailto:daniel@guihot.net)
diff --git a/dwm-pointerlock-6.8.diff b/dwm-pointerlock-6.8.diff
new file mode 100644
index 0000000..bb38f0a
--- /dev/null
+++ b/dwm-pointerlock-6.8.diff
@@ -0,0 +1,38 @@
+From 15cb084b099abe22b2d25a860b8739a81614cc48 Mon Sep 17 00:00:00 2001
+From: Daniel Guihot <daniel@guihot.net>
+Date: Wed, 16 Sep 2026 05:06:40 +1000
+Subject: [PATCH] pointerlock: ignore pointer focus changes while fullscreen
+
+enternotify() and motionnotify() change the selected monitor and focus
+when the pointer crosses a monitor edge. A fullscreen client can lose
+focus from mouse movement alone. Keep the focus on it while
+lockfullscreen is set, the same policy focusstack() already follows.
+---
+ dwm.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/dwm.c b/dwm.c
+index 53b393e..4872c7b 100644
+--- a/dwm.c
++++ b/dwm.c
+@@ -763,6 +763,8 @@ enternotify(XEvent *e)
+ 	Monitor *m;
+ 	XCrossingEvent *ev = &e->xcrossing;
+ 
++	if (lockfullscreen && selmon->sel && selmon->sel->isfullscreen)
++		return;
+ 	if ((ev->mode != NotifyNormal || ev->detail == NotifyInferior) && ev->window != root)
+ 		return;
+ 	c = wintoclient(ev->window);
+@@ -1132,6 +1134,8 @@ motionnotify(XEvent *e)
+ 	Monitor *m;
+ 	XMotionEvent *ev = &e->xmotion;
+ 
++	if (lockfullscreen && selmon->sel && selmon->sel->isfullscreen)
++		return;
+ 	if (ev->window != root)
+ 		return;
+ 	if ((m = recttomon(ev->x_root, ev->y_root, 1, 1)) != mon && mon) {
+-- 
+2.55.0
+