xash3d-fwgs/Documentation/extensions/expanded-common-structures.md

Expanded structures that used by engine and mods

To make porting and developing mods on 64-bit platforms less painful, we decided to expand size of several structures. This information important in case you are using codebase like XashXT, Paranoia 2: Savior and want to compile your mod for platform with 64-bit pointer size: you should replace old definitions with new ones, otherwise your mod will not work with Xash3D FWGS (typically, it's just crashing when starting map).

Structure name	Locates in file	Original size on 64-bit	Current size on 64-bit
mfaceinfo_t	common/com_model.h	176 bytes	304 bytes
decal_s	common/com_model.h	72 bytes	88 bytes
mextrasurf_t	common/com_model.h	376 bytes	504 bytes