Can't enter The Reactor in RTX mode

[Lamieur]

I can't get from Power Plant to The Reactor if the game is in RTX mode. I can play the map in OpenGL mode, but switching to RTX produces an instant crash.

I built Q2RTX in debug mode to get more info.

Crash is in src/refresh/vkpt/bsp_mesh.c:1363, first line of this block:

        for (int i = 0; i < (wm->world_sky_count + wm->world_custom_sky_count) / 3; i++)
        {
                int prim = wm->world_sky_offset / 3 + i;

                int cluster = wm->clusters[prim];
                clusters_with_sky[cluster >> 3] |= (1 << (cluster & 7));
        }

At the time of the crash, i=164 and wm=0x80000000008e9fb0 (but calling function passed wm=0x8e9fb0), so accessing wm->whatever causes a segmentation fault.

Clearly there was stack corruption, caused by previous iteration of this loop. With i=163, prim = 36037 and wm->clusters[prim] has a value of -1.

I have no idea what it all means and where that -1 came from, but I did what every clueless person would do and added if ( cluster > 0 ) in front of line 1368 ;) So far everything works, the map finally loads, I can change time of day and all...

Fedora 33, RTX 3080, driver 465.31.

Perhaps this is important: I got the .pkz files from latest release (1.5.0), but to get the .pak files, I took WINE and installed the game from a physical Quake 2 CD from an "Ultimate Quake" bundle. I assume everyone uses files from a Steam/GOG release, so maybe that's where this unexpected value came from? Just a thought.

[apanteleev]

Thank you for reporting this issue with all the details. I'm not sure what may have been the root cause, but I've submitted a patch that should prevent the stack corruption. Can you give the latest master a try?

[Lamieur]

Yes, current master allows me to play on The Reactor just fine \o/

Of course I'm still curious what effect does it have, but I can't find any visual glitches when playing with this, therefore closing as fixed :)