From 99491e2c512d4ed526aaf9c7e34ccfd3d22e98fe Mon Sep 17 00:00:00 2001
From: Emma Anholt <emma@anholt.net>
Date: Thu, 13 Nov 2025 14:19:14 -0800
Subject: cube: Fix VK_GOOGLE_display_timing path.

We were referencing present_time and ptime past their lifetimes in the
block, resulting in corruption of the pNext chain.
---
 cube/cube.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/cube/cube.c b/cube/cube.c
index 5797ca51..e21f3a28 100644
--- a/cube/cube.c
+++ b/cube/cube.c
@@ -1301,8 +1301,9 @@ static void demo_draw(struct demo *demo) {
         present.pNext = &regions;
     }
 
+    VkPresentTimesInfoGOOGLE present_time;
+    VkPresentTimeGOOGLE ptime;
     if (demo->VK_GOOGLE_display_timing_enabled) {
-        VkPresentTimeGOOGLE ptime;
         if (demo->prev_desired_present_time == 0) {
             // This must be the first present for this swapchain.
             //
@@ -1325,12 +1326,13 @@ static void demo_draw(struct demo *demo) {
         ptime.presentID = demo->next_present_id++;
         demo->prev_desired_present_time = ptime.desiredPresentTime;
 
-        VkPresentTimesInfoGOOGLE present_time = {
+        present_time = (VkPresentTimesInfoGOOGLE){
             .sType = VK_STRUCTURE_TYPE_PRESENT_TIMES_INFO_GOOGLE,
             .pNext = present.pNext,
             .swapchainCount = present.swapchainCount,
             .pTimes = &ptime,
         };
+
         if (demo->VK_GOOGLE_display_timing_enabled) {
             present.pNext = &present_time;
         }
-- 
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