xash3d-fwgs/Documentation/bug-compatibility.md

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Bug-compatibility in Xash3D FWGS

Xash3D FWGS has special mode for games that rely on original engine bugs. In this mode, we emulate the behaviour of selected functions that may help running mods relying on engine bugs, but enabling them by default may break majority of other games.

At this time, we only have implemented GoldSrc bug-compatibility. It can be enabled with -bugcomp command line switch.

When -bugcomp is specified without argument, it enables everything. This behavior might be changed or removed in future versions.

When -bugcomp is specified with argument, it interpreted as flags separated with +. This way it's possible to combine multiple levels of bug-compatibility.

GoldSrc bug-compatibility

Flag Description Games that require this flag
peoei Reverts pfnPEntityOfEntIndex behavior to GoldSrc, where it returns NULL for last player due to incorrect player index comparison * Counter-Strike: Condition Zero - Deleted Scenes