Fullscreen Windows+Vulkan hang on vkAcquireNextImageKHR()

slembcke · January 21, 2022, 3:51pm

I have Vulkann issue that only happens on Windows (possibly w/ AMD) when using SDL’s fullscreen modes. The game locks up and the next call to vkAcquireNextImageKHR() never returns. This happens when switching into fullscreen using SDL_SetWindowFullscreen() regardless of the fullscreen window vs exclusive mode. Windows resizing works fine, so I don’t think it’s a problem with swapchain recreation. I don’t get any validation layer errors, and everything seems to work fine on Linux (AMD / NV / Intel / RPi4). I haven’t tested on Intel or NV for a while on Windows as I don’t have easy access to such a machine, but I don’t remember the problem occurring there.

gist.github.com

https://gist.github.com/slembcke/4fa5b3f624162ab7f218dc65a929b94c#file-drift_app_sdl_vk-c-L1287

drift_app_sdl_vk.c

#include <stdio.h>
#include <string.h>

#include <volk/volk.h>
#include <SDL.h>
#include <SDL_vulkan.h>
#include <tina/tina_jobs.h>
#include <tracy/TracyC.h>

#include "drift_types.h"

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Unsure if this is a problem in my Vulkan code, the driver, SDL, etc. I’m wondering if anybody else has run into something similar?

someonesomewhere · September 13, 2022, 6:12pm

I don’t think this is a full solution and there is probably a solution that involves better synchronisation, buit a workaround is to set the swapchain create info’s minImageCount to max(2, caps.minImageCount). On AMD, a fullscreen swapchain has a min image count of 1 which seems to lead to the hang.

slembcke · September 14, 2022, 3:37pm

Ah! A blast from the past, but I haven’t fixed this issue yet. Will give it a try in a day or two! If it’s really an issue where I’m deadlocking myself when given a single image, that’s something concrete I can look for too. Thanks!