I'm loading lights.pk3 and brightmaps.pk3. Just those 2. the gameplay mod is ral_light_v4.1.pk3, but I tried it with vanilla doom and the same thing happens. Just to be clear, this is with gzdoom osx version 0.5.7, the prerelease.
What are those brightmapped textures you mentioned? The brightmaps.pk3 supplied with GZDoom contains sprites only. Maybe your hardware spec will shed some light on this issue.
Wivicer wrote:You're right. I forgot I was loading sbrightmaps.pk3 as well.
Everything I can do at the moment is to confirm that loading sbrightmaps.pk3 is causing this issue. However it's not specific to OS X, the problem is in compatibility OpenGL 2.x renderer. Probably some feature is not implemented yet. Graf knows much more on this topic.
Indeed .pk3 is missing from the package. Blzut3 should take a look at this. Probably the file from Windows build can used if difference in line endings doesn't break something. It must be placed near executable inside application bundle.
The situation with macOS devbuilds is worse than I expected. Not only .pk3 is missing, x64 binary is stopped updating at 2.9pre-506-g1648a71. In other words PowerPC part of universal executable matches disk image version but x64 is not. This explains the error you got.
Now it works, but every time I open the app, I get a standard warning that "I'm opening it for the first time; am I sure I want to open it?". Also, it starts with the window behind other windows.