diff --git a/SConstruct b/SConstruct
index 29c25d99b..0089fae85 100644
--- a/SConstruct
+++ b/SConstruct
@@ -4546,6 +4546,7 @@ class DXXArchive(DXXCommon):
 'common/arch/sdl/mouse.cpp',
 'common/arch/sdl/timer.cpp',
 'common/arch/sdl/window.cpp',
+'common/main/cglobal.cpp',
 'common/main/cli.cpp',
 'common/main/cmd.cpp',
 'common/main/cvar.cpp',
diff --git a/common/main/cglobal.cpp b/common/main/cglobal.cpp
new file mode 100644
index 000000000..e255e1aff
--- /dev/null
+++ b/common/main/cglobal.cpp
@@ -0,0 +1,46 @@
+/*
+ * Portions of this file are copyright Rebirth contributors and licensed as
+ * described in COPYING.txt.
+ * Portions of this file are copyright Parallax Software and licensed
+ * according to the Parallax license below.
+ * See COPYING.txt for license details.
+
+THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
+SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
+END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
+ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
+IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
+SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
+FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
+CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
+AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
+COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
+*/
+
+/*
+ * Global constants for main directory
+ */
+
+#include "segment.h"
+
+namespace dcx {
+//	Translate table to get opposite side of a face on a segment.
+constexpr per_side_array<sidenum_t> Side_opposite{{{
+	sidenum_t::WRIGHT,
+	sidenum_t::WBOTTOM,
+	sidenum_t::WLEFT,
+	sidenum_t::WTOP,
+	sidenum_t::WFRONT,
+	sidenum_t::WBACK
+}}};
+
+const per_side_array<enumerated_array<segment_relative_vertnum, 4, side_relative_vertnum>> Side_to_verts{{{
+	{{{segment_relative_vertnum::_7, segment_relative_vertnum::_6, segment_relative_vertnum::_2, segment_relative_vertnum::_3}}}, 			// left
+	{{{segment_relative_vertnum::_0, segment_relative_vertnum::_4, segment_relative_vertnum::_7, segment_relative_vertnum::_3}}}, 			// top
+	{{{segment_relative_vertnum::_0, segment_relative_vertnum::_1, segment_relative_vertnum::_5, segment_relative_vertnum::_4}}}, 			// right
+	{{{segment_relative_vertnum::_2, segment_relative_vertnum::_6, segment_relative_vertnum::_5, segment_relative_vertnum::_1}}}, 			// bottom
+	{{{segment_relative_vertnum::_4, segment_relative_vertnum::_5, segment_relative_vertnum::_6, segment_relative_vertnum::_7}}}, 			// back
+	{{{segment_relative_vertnum::_3, segment_relative_vertnum::_2, segment_relative_vertnum::_1, segment_relative_vertnum::_0}}}, 			// front
+}}};
+
+}
diff --git a/similar/main/mglobal.cpp b/similar/main/mglobal.cpp
index eaa8a92da..2b509db41 100644
--- a/similar/main/mglobal.cpp
+++ b/similar/main/mglobal.cpp
@@ -60,7 +60,6 @@ d_level_unique_automap_state LevelUniqueAutomapState;
 d_level_unique_fuelcenter_state LevelUniqueFuelcenterState;
 d_level_unique_robot_awareness_state LevelUniqueRobotAwarenessState;
 d_level_unique_segment_state LevelUniqueSegmentState;
-// Global array of vertices, common to one mine.
 valptridx<player>::array_managed_type Players;
 valptridx<segment>::array_managed_type Segments;
 }
@@ -73,37 +72,6 @@ fix64 GameTime64 = 0;			//	Time in game, in seconds
 int d_tick_count = 0; // increments every 33.33ms
 int d_tick_step = 0;  // true once every 33.33ms
 
-//	This is the global mine which create_new_mine returns.
-//lsegment	Lsegments[MAX_SEGMENTS];
-
-// Number of vertices in current mine (ie, Vertices, pointed to by Vp)
-
-//	Translate table to get opposite side of a face on a segment.
-
-constexpr per_side_array<sidenum_t> Side_opposite{{{
-	sidenum_t::WRIGHT,
-	sidenum_t::WBOTTOM,
-	sidenum_t::WLEFT,
-	sidenum_t::WTOP,
-	sidenum_t::WFRONT,
-	sidenum_t::WBACK
-}}};
-
-#define TOLOWER(c) ((((c)>='A') && ((c)<='Z'))?((c)+('a'-'A')):(c))
-
-const per_side_array<enumerated_array<segment_relative_vertnum, 4, side_relative_vertnum>> Side_to_verts{{{
-	{{{segment_relative_vertnum::_7, segment_relative_vertnum::_6, segment_relative_vertnum::_2, segment_relative_vertnum::_3}}}, 			// left
-	{{{segment_relative_vertnum::_0, segment_relative_vertnum::_4, segment_relative_vertnum::_7, segment_relative_vertnum::_3}}}, 			// top
-	{{{segment_relative_vertnum::_0, segment_relative_vertnum::_1, segment_relative_vertnum::_5, segment_relative_vertnum::_4}}}, 			// right
-	{{{segment_relative_vertnum::_2, segment_relative_vertnum::_6, segment_relative_vertnum::_5, segment_relative_vertnum::_1}}}, 			// bottom
-	{{{segment_relative_vertnum::_4, segment_relative_vertnum::_5, segment_relative_vertnum::_6, segment_relative_vertnum::_7}}}, 			// back
-	{{{segment_relative_vertnum::_3, segment_relative_vertnum::_2, segment_relative_vertnum::_1, segment_relative_vertnum::_0}}}, 			// front
-}}};
-
-// Texture map stuff
-
-//--unused-- fix	Laser_delay_time = F1_0/6;		//	Delay between laser fires.
-
 static void reset_globals_for_new_game()
 {
 	reconstruct_global_variable(LevelSharedBossState);