-void R_Mesh_PrepareVertices_Generic(int numvertices, const r_vertexgeneric_t *vertex, const r_meshbuffer_t *vertexbuffer, int bufferoffset);
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-r_vertexmesh_t *R_Mesh_PrepareVertices_Mesh_Lock(int numvertices);
-qboolean R_Mesh_PrepareVertices_Mesh_Unlock(void); // if this returns false, you need to prepare the mesh again!