Calling a second time ``pygame.display.set_mode`` with ``vsync`` and ``vsync`` already enabled doesn't work correctly

[bilhox]

Environment:

• Operating system : Windows 11
• Python version : 3.11.4 / 3.12.0
• SDL version : 2.26.5
• PyGame version : 2.3.2 / 2.4.0.dev2

Current behavior:

If you call pygame.display.set_mode with vsync enabled and then again with vsync enabled, the screen is black (like you lost the hand on the screen) and when you resize, the rest of the window is transparent.

Expected behavior:

You don't lost the hand on the screen, and it correctly resizes. Note : If you quit pygame between the two calls, the problem is fixed, could you tell me if it's what we should do ?

Screenshots

Test program:

import pygame
import math

pygame.init()

screen = pygame.display.set_mode([800, 800], flags=pygame.RESIZABLE+pygame.SCALED, vsync=1)
screen2 = pygame.display.set_mode([900, 800], flags=pygame.RESIZABLE+pygame.SCALED, vsync=1)

clock = pygame.Clock()
pos = []
timer = 0

running = True

while running:

    dt = clock.tick() / 1000
    timer += dt

    screen.fill("black")

    pos = [400 + 40*math.cos(5*timer) + 20*math.cos(10*timer) + 200*math.cos(timer), 400 + 20*math.sin(10*timer) + 40*math.sin(5*timer) + 200*math.sin(timer)]

    pygame.draw.circle(screen, "red", pos, 20)

    pygame.display.flip()

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            running = False

[Starbuck5]

Is this similar to https://github.com/pygame-community/pygame-ce/issues/2376?

[bilhox]

Is this similar to https://github.com/pygame-community/pygame-ce/issues/2376?

No 🤔

[Matiiss]

Despite a little bit of stuttering at first, the test program works just fine for me (can manually resize it too) on both pygame-ce 2.3.2 (SDL 2.26.5, Python 3.12.0) and pygame-ce 2.4.0.dev3 (SDL 2.26.5, Python 3.12.0) (current main). On Windows 10 though.

Does it just get stuck for you like in the screenshots?

[bilhox]

Yup, I lose control of the window surface, I can resize the window, but the result looks just like in the screenshots

[bilhox]

Sending this GIF file to illustrate the problem :

[MyreMylar]

While tinkering with this in the current main I continually got a pygame.error:

Traceback (most recent call last):
  File "C:\Users\dan\Programming\scrap\soundfont_testing.py", line 6, in <module>
    pygame.display.set_mode([800, 600], flags=pygame.SCALED)
pygame.error: failed to create renderer

I boiled it down to this:

import pygame

pygame.init()

pygame.display.set_mode([800, 600])
pygame.display.set_mode([800, 600], flags=pygame.SCALED)

[bilhox]

@MyreMylar It seems that something happened between 2.5.0 and 2.5.1, because now it segfaults. The debug infos :

pygame-ce 2.5.2.dev1 (SDL 2.30.7, Python 3.12.0)
Platform:               Windows-11-10.0.22631-SP0
System:                 Windows
System Version:         10.0.22631
Processor:              AMD64 Family 23 Model 104 Stepping 1, AuthenticAMD      SSE2: Yes       AVX2: Yes       NEON: No
Architecture:           Bits: 64bit     Linkage: WindowsPE

Python:                 CPython 3.12.0 (tags/v3.12.0:0fb18b0, Oct  2 2023, 13:03:39) [MSC v.1935 64 bit (AMD64)]
pygame version:         2.5.2.dev1
SDL versions:           Linked: 2.30.7  Compiled: 2.30.7
SDL Mixer versions:     Linked: 2.8.0   Compiled: 2.8.0
SDL Font versions:      Linked: 2.22.0  Compiled: 2.22.0
SDL Image versions:     Linked: 2.8.2   Compiled: 2.8.2
Freetype versions:      Linked: 2.11.1  Compiled: 2.11.1

Display Driver:         windows
Mixer Driver:           wasapi

[MyreMylar]

A minimal method of reproduction on windows to the new segfault (different to the old one):

import pygame

pygame.init()

pygame.display.set_mode([800, 600], flags=pygame.RESIZABLE | pygame.SCALED)
pygame.display.set_mode([800, 601], flags=pygame.RESIZABLE | pygame.SCALED)

All these elements seem necessary to trigger the segfault it has to be SCALED and RESIZABLE -> to SCALED and RESIZABLE and the windows has to change size.

[ankith26]

Cannot reproduce this issue in pygame-ce==2.5.5 but I'm on Ubuntu. @bilhox can you confirm if there is still an issue or segfault RN on windows?

[oddbookworm]

None of the code snippets in this issue caused a segfault for me on windows

pygame-ce 2.5.5 (SDL 2.32.6, Python 3.13.3)
Platform:               Windows-11-10.0.26100-SP0
System:                 Windows
System Version:         10.0.26100
Processor:              AMD64 Family 25 Model 97 Stepping 2, AuthenticAMD       SSE2: Yes       AVX2: Yes       NEON: No
Architecture:           Bits: 64bit     Linkage: WindowsPE

Python:                 CPython 3.13.3 (tags/v3.13.3:6280bb5, Apr  8 2025, 14:47:33) [MSC v.1943 64 bit (AMD64)]
GIL Enabled:            True
pygame version:         2.5.5
SDL versions:           Linked: 2.32.6  Compiled: 2.32.6
SDL Mixer versions:     Linked: 2.8.1   Compiled: 2.8.1
SDL Font versions:      Linked: 2.24.0  Compiled: 2.24.0
SDL Image versions:     Linked: 2.8.8   Compiled: 2.8.8
Freetype versions:      Linked: 2.11.1  Compiled: 2.11.1

Display Driver:         windows
Mixer Driver:           wasapi

[bilhox]

Hello, the code snippet I originally provided in the issue still cause a segfault for me.

pygame-ce 2.5.5 (SDL 2.32.6, Python 3.13.0)
Platform:               Windows-11-10.0.22631-SP0
System:                 Windows
System Version:         10.0.22631
Processor:              AMD64 Family 23 Model 104 Stepping 1, AuthenticAMD      SSE2: Yes       AVX2: Yes       NEON: No
Architecture:           Bits: 64bit     Linkage: WindowsPE

Python:                 CPython 3.13.0 (tags/v3.13.0:60403a5, Oct  7 2024, 09:38:07) [MSC v.1941 64 bit (AMD64)]
GIL Enabled:            True
pygame version:         2.5.5
SDL versions:           Linked: 2.32.6  Compiled: 2.32.6
SDL Mixer versions:     Linked: 2.8.1   Compiled: 2.8.1
SDL Font versions:      Linked: 2.24.0  Compiled: 2.24.0
SDL Image versions:     Linked: 2.8.8   Compiled: 2.8.8
Freetype versions:      Linked: 2.11.1  Compiled: 2.11.1

Display Driver:         windows
Mixer Driver:           wasapi