extern mplane_t frustum[4];
extern int c_alias_polys, c_light_polys, c_faces, c_nodes, c_leafs, c_models, c_bmodels, c_sprites, c_particles, c_dlights;
+// brightness of world lightmaps and related lighting
+// (often reduced when world rtlights are enabled)
+extern float r_lightmapintensity;
+// whether to draw world lights realtime, dlights realtime, and their shadows
+extern qboolean r_rtworld;
+extern qboolean r_rtworldshadows;
+extern qboolean r_rtdlight;
+extern qboolean r_rtdlightshadows;
+
// forces all rendering to draw triangle outlines
extern cvar_t r_showtris;
extern int r_showtrispass;