From 711fb83bda3652208c6ea91d2b8f4e23dabe18bd Mon Sep 17 00:00:00 2001
From: tiosgz <alamica@protonmail.com>
Date: Sun, 19 Sep 2021 12:55:52 +0000
Subject: [PATCH] Use buffer age when rendering

---
 kiwmi/desktop/output.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/kiwmi/desktop/output.c b/kiwmi/desktop/output.c
index c327d59..6a81508 100644
--- a/kiwmi/desktop/output.c
+++ b/kiwmi/desktop/output.c
@@ -160,7 +160,13 @@ output_frame_notify(struct wl_listener *listener, void *data)
     struct timespec now;
     clock_gettime(CLOCK_MONOTONIC, &now);
 
-    if (output->damaged == 0) {
+    int buffer_age;
+    if (!wlr_output_attach_render(wlr_output, &buffer_age)) {
+        wlr_log(WLR_ERROR, "Failed to attach renderer to output");
+        return;
+    }
+
+    if (output->damaged == 0 && buffer_age > 0) {
         send_frame_done_to_layer(
             &output->layers[ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND], &now);
         send_frame_done_to_layer(
@@ -176,11 +182,6 @@ output_frame_notify(struct wl_listener *listener, void *data)
                 view, send_frame_done_to_surface, &now);
         }
 
-        if (!wlr_output_attach_render(wlr_output, NULL)) {
-            wlr_log(WLR_ERROR, "Failed to attach renderer to output");
-            return;
-        }
-
         if (render_cursors(wlr_output)) {
             output_damage(output);
         }
@@ -193,11 +194,6 @@ output_frame_notify(struct wl_listener *listener, void *data)
     struct wlr_renderer *renderer =
         wlr_backend_get_renderer(wlr_output->backend);
 
-    if (!wlr_output_attach_render(wlr_output, NULL)) {
-        wlr_log(WLR_ERROR, "Failed to attach renderer to output");
-        return;
-    }
-
     int width;
     int height;
     wlr_output_effective_resolution(wlr_output, &width, &height);