From ab879e245cbc317e3a2f5ec0379143d4b25b3cfe Mon Sep 17 00:00:00 2001
From: Isaac Freund <mail@isaacfreund.com>
Date: Sun, 29 Dec 2024 16:09:44 -0600
Subject: [PATCH] Output: check scene damage before rendering

This should fix adaptive sync/VRR, which was regressed by db7de8151.
---
 river/Output.zig | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/river/Output.zig b/river/Output.zig
index d4490c3..34e49dd 100644
--- a/river/Output.zig
+++ b/river/Output.zig
@@ -542,6 +542,13 @@ fn handleFrame(listener: *wl.Listener(*wlr.Output), _: *wlr.Output) void {
 }
 
 fn renderAndCommit(output: *Output, scene_output: *wlr.SceneOutput) !void {
+    // TODO(wlroots): replace this with wlr_scene_output_needs_frame()
+    if (!output.wlr_output.needs_frame and !output.gamma_dirty and
+        !scene_output.pending_commit_damage.notEmpty())
+    {
+        return;
+    }
+
     var state = wlr.Output.State.init();
     defer state.finish();