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engine: mod_bmodel: allow firstclipnode index to be negative, as maps compiled with it rely on this trick by encoding whole hull as empty contents

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This commit is contained in:
Alibek Omarov
2025-07-16 23:42:27 +05:00
parent 599b1b48ec
commit 4c9b69af5f
1 changed files with 3 additions and 1 deletions
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4
engine/common/mod_bmodel.c
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@@ -1775,7 +1775,9 @@ static void Mod_SetupHull( dbspmodel_t *bmod, model_t *mod, int headnode, int hu
hull->planes = mod->planes;
// some map "optimizers" (you know who you are!) put -1 here
hull->firstclipnode = Q_max( 0, headnode );
// ... and it's purposefully? encode CONTENTS_EMPTY sometimes
// but might cause out of bounds reads
hull->firstclipnode = headnode;
hull->lastclipnode = mod->numclipnodes - 1;
// only allocate clipnodes array for the base model, only for first hull