From: divverent <divverent@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Fri, 19 Oct 2018 07:38:00 +0000
Subject: Do not build VBOs on a dedicated server.

Fixes crash at startup of dedicated server in Quake and Xonotic
(probably in everything).

The only reason why this ever worked before was that Mod_BuildVBOs's
main callee R_Mesh_CreateMeshBuffer did a GL2 feature test before
calling into anything VBO related (and on a dedicated server, which does
not initialize GL, the test always returns false); however now that we
require GL32, the feature test is gone and thus the crash happened. An
explicit check for being a dedicated server fixes that.

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12469 d7cf8633-e32d-0410-b094-e92efae38249
(cherry picked from commit d65ddd94d473b4925aa589ae2c32a3cf1c250e31)
Origin: upstream, commit:r12469
---
 model_shared.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/model_shared.c b/model_shared.c
index 48b4315..a6d9767 100644
--- a/model_shared.c
+++ b/model_shared.c
@@ -2893,6 +2893,9 @@ void Mod_MakeSortedSurfaces(dp_model_t *mod)
 
 void Mod_BuildVBOs(void)
 {
+	if(cls.state == ca_dedicated)
+		return;
+
 	if (!loadmodel->surfmesh.num_vertices)
 		return;