Problems with Open-GL accelerated on GZDoom

The problem with hardware-accelerated rendering is that you're at the mercy of the hardware (and its drivers) working as expected. I'm pretty sure this issue isn't on the GZDoom side.

It may be useful to know your graphics card model.

Also, the generic answer for this kind of problems is to update your graphics card driver (if you haven't already).

If your PC is very old, have you tried the Vintage version of GZDoom? It's available on the ZDoom download page. It uses an older renderer that works on older hardware. The main GZDoom release uses OpenGL features that are comparatively modern, so can cause issues for older GPUs.

4 minutes ago, Bauul said:

If your PC is very old, have you tried the Vintage version of GZDoom? It's available on the ZDoom download page. It uses an older renderer that works on older hardware. The main GZDoom release uses OpenGL features that are comparatively modern, so can cause issues for older GPUs.

will try this, thanks!