Terrain crash on Linux

[portaloffreedom]

Adding the terrain from the editor enters a crash. Cause is Division by zero. Crash is happening here: https://github.com/turanszkij/WickedEngine/blob/master/WickedEngine/wiTerrain.cpp#L1210-L1211

region.width = atlas.maps[map_type].texture.desc.width / atlas.maps[map_type].texture.sparse_properties->tile_width;
region.height = atlas.maps[map_type].texture.desc.height / atlas.maps[map_type].texture.sparse_properties->tile_height;

The debugger shows the sparse_properties to be zero:

(gdb) print sparse_properties
$1 = (const wi::graphics::SparseTextureProperties *) 0x5555572f85c8
(gdb) print *sparse_properties
$2 = {tile_width = 0, tile_height = 0, tile_depth = 0, total_tile_count = 16384, packed_mip_start = 0, packed_mip_count = 0, packed_mip_tile_offset = 0, packed_mip_tile_count = 0}

[brakhane]

That happens when the GPU does not support sparse buffers. The engine treats it as an optional feature, but the terrain system assumes it does exist.

[portaloffreedom]

Intel Xe Mesa driver seems to not support sparse buffers

[portaloffreedom]

This should be fixed once Mesa 24 is out. https://www.gamingonlinux.com/2023/11/intel-vulkan-drivers-on-linux-should-run-more-games-with-mesa-24-0/

[brakhane]

@turanszkij Can we keep this open? Seems like github doesn't understand what "doesn't solve" means.

[turanszkij]

Yeah, I didn't mean to close it, just happened automatically.

[brakhane]

With the recent drivers, terrain now works for me on Intel Xe. Granted, it's almost measured in SPF and not FPS, but it doesn't crash anymore.

[turanszkij]

Thanks, I'll close it then.