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10-11-2005
, 16:21
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#6
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I would prefer if people called it SMM, MM:S, or Metamod:S. SM is SourceMod.
Ronny does not understand virtual tables. If valve has provided interface B, a plugin compiled against B is now only binary compatible to that version of B. This is true whether it is an MM:S plugin or a Valve Server Plugin.
Example:
Valve Server Plugin X and Metamod:Source plugin Y are both using Interface B normally. A non-breaking update cannot affect either plugins in any way.
A breaking update that results in the virtual table being reordered, will break both plugins. If either plugin is hardcoded against a specific vtable index, either will break. Because of the way SourceHook is designed, however, you're not hardcoded against a vtable index. You just need to recompile to match the new interface header.
Ronny was probably referring to how DoD:S broke MM:S. There were two reasons behind this: Valve doesn't version their interfaces properly (see the SourceMod devlog), and MM:S wasn't using vtable hacks on the GameDLL interface. If MM:S had been using vtable hacks on the GameDLL interface rather than trying to reimplement it, this wouldn't have happened. Note: The GameDLL loading was rewritten from scratch in 1.1 to get around this problem (it now uses vtable hacks).
As of this writing, MM:S can still be broken, but it's got nothing to do with vtable hacks. It's got everything to do with valve providing proprietary/unreleased interfaces in between the GameDLL and Engine, which is what they did with DoD:S. Luckily, it was backward compatible. Furthermore, it affected server plugins too, because they weren't notified of the new interface and Valve is convinced that they're not obligated to tell anyone of the changes.
The problem of things breaking is a problem directly centered on Valve's incomprehensible policy and falls equally on server plugins as it does to MM:S.
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