Sway VRR cursor

sway.patch

diff --git a/include/sway/output.h b/include/sway/output.h
index 50d90d25..6e9f7aef 100644
--- a/include/sway/output.h
+++ b/include/sway/output.h
@@ -8,6 +8,7 @@
 #include "config.h"
 #include "sway/tree/node.h"
 #include "sway/tree/view.h"
+#include <pixman.h>
 
 struct sway_server;
 struct sway_container;
@@ -58,6 +59,7 @@ struct sway_output {
 	int max_render_time; // In milliseconds
 	struct wl_event_source *repaint_timer;
 	bool gamma_lut_changed;
+	pixman_region32_t cursor_damage;
 };
 
 struct sway_output_non_desktop {
diff --git a/sway/desktop/output.c b/sway/desktop/output.c
index 476bfd25..759e9cab 100644
--- a/sway/desktop/output.c
+++ b/sway/desktop/output.c
@@ -571,6 +571,9 @@ static int output_repaint_timer_handler(void *data) {
 		return 0;
 	}
 
+	wlr_damage_ring_add(&output->damage_ring, &output->cursor_damage);
+	pixman_region32_clear(&output->cursor_damage);
+
 	struct sway_workspace *workspace = output->current.active_workspace;
 	if (workspace == NULL) {
 		return 0;
@@ -601,7 +604,17 @@ static int output_repaint_timer_handler(void *data) {
 	pending.committed |= WLR_OUTPUT_STATE_DAMAGE;
 	get_frame_damage(output, &pending.damage);
 
-	if (fullscreen_con && fullscreen_con->view && !debug.noscanout) {
+	const bool adaptive_sync = output->wlr_output->adaptive_sync_status == WLR_OUTPUT_ADAPTIVE_SYNC_ENABLED;
+	const bool has_fullscreen_view = fullscreen_con && fullscreen_con->view;
+	const bool no_cursor_move_frames = output->wlr_output->no_frames_for_cursor_moves;
+
+	if (has_fullscreen_view && adaptive_sync && !no_cursor_move_frames) {
+		output->wlr_output->no_frames_for_cursor_moves = true;
+	} else if ((!has_fullscreen_view || !adaptive_sync) && no_cursor_move_frames) {
+		output->wlr_output->no_frames_for_cursor_moves = false;
+	}
+
+	if (has_fullscreen_view && !debug.noscanout) {
 		// Try to scan-out the fullscreen view
 		static bool last_scanned_out = false;
 		bool scanned_out =
@@ -688,9 +701,19 @@ static void handle_damage(struct wl_listener *listener, void *user_data) {
 	struct sway_output *output =
 		wl_container_of(listener, output, damage);
 	struct wlr_output_event_damage *event = user_data;
-	if (wlr_damage_ring_add(&output->damage_ring, event->damage)) {
-		wlr_output_schedule_frame(output->wlr_output);
+
+	pixman_region32_t clipped;
+	pixman_region32_init(&clipped);
+	pixman_region32_intersect_rect(&clipped, event->damage,
+		0, 0, output->damage_ring.width, output->damage_ring.height);
+	bool intersects = pixman_region32_not_empty(&clipped);
+	if (intersects) {
+		pixman_region32_union(&output->cursor_damage, &output->cursor_damage, &clipped);
+		if (!output->wlr_output->no_frames_for_cursor_moves) {
+			wlr_output_schedule_frame(output->wlr_output);
+		}
 	}
+	pixman_region32_fini(&clipped);
 }
 
 static void handle_frame(struct wl_listener *listener, void *user_data) {
diff --git a/sway/tree/output.c b/sway/tree/output.c
index eccab2f7..626d81a3 100644
--- a/sway/tree/output.c
+++ b/sway/tree/output.c
@@ -94,6 +94,7 @@ struct sway_output *output_create(struct wlr_output *wlr_output) {
 	wlr_output->data = output;
 	output->detected_subpixel = wlr_output->subpixel;
 	output->scale_filter = SCALE_FILTER_NEAREST;
+	pixman_region32_init(&output->cursor_damage);
 
 	wl_signal_init(&output->events.disable);
 
@@ -241,6 +242,7 @@ void output_destroy(struct sway_output *output) {
 	list_free(output->workspaces);
 	list_free(output->current.workspaces);
 	wl_event_source_remove(output->repaint_timer);
+	pixman_region32_fini(&output->cursor_damage);
 	free(output);
 }
 

wlroots.patch

diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index a4853ffa..9ede73bf 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -976,7 +976,8 @@ static bool drm_connector_set_cursor(struct wlr_output *output,
 		conn->cursor_height = buffer->height;
 	}
 
-	wlr_output_update_needs_frame(output);
+	if (!output->no_frames_for_cursor_moves)
+		wlr_output_update_needs_frame(output);
 	return true;
 }
 
@@ -1006,7 +1007,8 @@ static bool drm_connector_move_cursor(struct wlr_output *output,
 	conn->cursor_x = box.x;
 	conn->cursor_y = box.y;
 
-	wlr_output_update_needs_frame(output);
+	if (!output->no_frames_for_cursor_moves)
+		wlr_output_update_needs_frame(output);
 	return true;
 }
 
diff --git a/include/wlr/types/wlr_output.h b/include/wlr/types/wlr_output.h
index aa3d7a18..8e321dae 100644
--- a/include/wlr/types/wlr_output.h
+++ b/include/wlr/types/wlr_output.h
@@ -148,6 +148,7 @@ struct wlr_output {
 	// damage for cursors and fullscreen surface, in output-local coordinates
 	bool frame_pending;
 	float transform_matrix[9];
+	bool no_frames_for_cursor_moves;
 
 	// true for example with VR headsets
 	bool non_desktop;

Oh thanks for the tip! I was directed to these patches somewhere and wasn't aware there's other work going on.

Glad to help
Also make sure to try it without direct scanout, made a huge difference for me
swaywm/sway#7714 (comment)