diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 902091b7a..9fb536ca3 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -876,7 +876,6 @@ set (PCH_SOURCES
 	playsim/p_user.cpp
 	rendering/r_utility.cpp
 	rendering/r_sky.cpp
-	rendering/r_videoscale.cpp
 	sound/s_advsound.cpp
 	sound/s_reverbedit.cpp
 	sound/s_sndseq.cpp
@@ -1147,6 +1146,7 @@ set (PCH_SOURCES
 	common/objects/dobject.cpp
 	common/objects/dobjgc.cpp
 	common/objects/dobjtype.cpp
+	common/rendering/r_videoscale.cpp
 	common/rendering/gl_load/gl_interface.cpp
 	common/scripting/core/dictionary.cpp
 	common/scripting/core/dynarrays.cpp
diff --git a/src/common/engine/i_interface.h b/src/common/engine/i_interface.h
index d992203d9..564b7d91c 100644
--- a/src/common/engine/i_interface.h
+++ b/src/common/engine/i_interface.h
@@ -11,7 +11,7 @@ struct SystemCallbacks
 	bool (*CaptureModeInGame)();
 	void (*CrashInfo)(char* buffer, size_t bufflen, const char* lfstr);
 	void (*PlayStartupSound)(const char* name);
-
+	bool (*IsSpecialUI)();
 };
 
 extern SystemCallbacks *sysCallbacks;
diff --git a/src/rendering/i_video.h b/src/common/rendering/i_video.h
similarity index 100%
rename from src/rendering/i_video.h
rename to src/common/rendering/i_video.h
diff --git a/src/rendering/r_videoscale.cpp b/src/common/rendering/r_videoscale.cpp
similarity index 96%
rename from src/rendering/r_videoscale.cpp
rename to src/common/rendering/r_videoscale.cpp
index a71ee7c3e..b528d992f 100644
--- a/src/rendering/r_videoscale.cpp
+++ b/src/common/rendering/r_videoscale.cpp
@@ -36,19 +36,15 @@
 #include "v_video.h"
 #include "templates.h"
 #include "r_videoscale.h"
-
-#include "c_console.h"
-#include "menu/menu.h"
+#include "cmdlib.h"
+#include "v_draw.h"
+#include "i_interface.h"
 
 #define NUMSCALEMODES countof(vScaleTable)
-
-extern bool setsizeneeded, multiplayer, generic_ui;
+extern bool setsizeneeded;
 
 EXTERN_CVAR(Int, vid_aspect)
 
-EXTERN_CVAR(Bool, log_vgafont)
-EXTERN_CVAR(Bool, dlg_vgafont)
-
 CUSTOM_CVAR(Int, vid_scale_customwidth, VID_MIN_WIDTH, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
 {
 	if (self < VID_MIN_WIDTH)
@@ -69,6 +65,9 @@ CUSTOM_CVAR(Float, vid_scale_custompixelaspect, 1.0, CVAR_ARCHIVE | CVAR_GLOBALC
 		self = 1.0;
 }
 
+static const int VID_MIN_UI_WIDTH = 640;
+static const int VID_MIN_UI_HEIGHT = 400;
+
 namespace
 {
 	uint32_t min_width = VID_MIN_WIDTH;
@@ -108,8 +107,7 @@ namespace
 		static bool lastspecialUI = false;
 		bool isInActualMenu = false;
 
-		bool specialUI = (generic_ui || !!log_vgafont || !!dlg_vgafont || ConsoleState != c_up || multiplayer ||
-			(menuactive == MENU_On && CurrentMenu && !CurrentMenu->IsKindOf("ConversationMenu")));
+		bool specialUI = sysCallbacks && (!sysCallbacks->IsSpecialUI || sysCallbacks->IsSpecialUI());
 
 		if (specialUI == lastspecialUI)
 			return;
diff --git a/src/rendering/r_videoscale.h b/src/common/rendering/r_videoscale.h
similarity index 100%
rename from src/rendering/r_videoscale.h
rename to src/common/rendering/r_videoscale.h
diff --git a/src/d_main.cpp b/src/d_main.cpp
index 815a726d0..5d7f8f19e 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -122,6 +122,9 @@
 EXTERN_CVAR(Bool, hud_althud)
 EXTERN_CVAR(Int, vr_mode)
 EXTERN_CVAR(Bool, cl_customizeinvulmap)
+EXTERN_CVAR(Bool, log_vgafont)
+EXTERN_CVAR(Bool, dlg_vgafont)
+
 void DrawHUD();
 void D_DoAnonStats();
 void I_DetectOS();
@@ -2645,6 +2648,13 @@ static void System_PlayStartupSound(const char* sndname)
 	S_Sound(CHAN_BODY, 0, sndname, 1, ATTN_NONE);
 }
 
+static bool System_IsSpecialUI()
+{
+	return (generic_ui || !!log_vgafont || !!dlg_vgafont || ConsoleState != c_up || multiplayer ||
+		(menuactive == MENU_On && CurrentMenu && !CurrentMenu->IsKindOf("ConversationMenu")));
+
+}
+
 //==========================================================================
 //
 // DoomSpecificInfo
@@ -2848,6 +2858,8 @@ static int D_DoomMain_Internal (void)
 		System_WantNativeMouse,
 		System_CaptureModeInGame,
 		System_CrashInfo,
+		System_PlayStartupSound,
+		System_IsSpecialUI,
 	};
 	sysCallbacks = &syscb;
 	
diff --git a/src/rendering/gl/renderer/gl_postprocess.cpp b/src/rendering/gl/renderer/gl_postprocess.cpp
index 8d1cee2c6..274667c32 100644
--- a/src/rendering/gl/renderer/gl_postprocess.cpp
+++ b/src/rendering/gl/renderer/gl_postprocess.cpp
@@ -20,10 +20,8 @@
 */
 
 #include "gl_system.h"
-#include "gi.h"
 #include "m_png.h"
 #include "r_utility.h"
-#include "d_player.h"
 #include "gl/system/gl_buffers.h"
 #include "gl/system/gl_framebuffer.h"
 #include "hwrenderer/utility/hw_cvars.h"
diff --git a/src/rendering/polyrenderer/backend/poly_framebuffer.cpp b/src/rendering/polyrenderer/backend/poly_framebuffer.cpp
index 6fbdb0fd4..24aea9179 100644
--- a/src/rendering/polyrenderer/backend/poly_framebuffer.cpp
+++ b/src/rendering/polyrenderer/backend/poly_framebuffer.cpp
@@ -27,8 +27,7 @@
 #include "i_time.h"
 #include "g_game.h"
 #include "v_text.h"
-
-#include "rendering/i_video.h"
+#include "i_video.h"
 
 #include "hwrenderer/utility/hw_clock.h"
 #include "hwrenderer/utility/hw_vrmodes.h"
diff --git a/src/rendering/v_video.h b/src/rendering/v_video.h
index d01775676..91934bc6b 100644
--- a/src/rendering/v_video.h
+++ b/src/rendering/v_video.h
@@ -51,9 +51,6 @@
 static const int VID_MIN_WIDTH = 320;
 static const int VID_MIN_HEIGHT = 200;
 
-static const int VID_MIN_UI_WIDTH = 640;
-static const int VID_MIN_UI_HEIGHT = 400;
-
 class player_t;
 struct sector_t;
 struct FPortalSceneState;