diff --git a/source/blood/src/blood.cpp b/source/blood/src/blood.cpp
index f88f93a1f..ac1c66eab 100644
--- a/source/blood/src/blood.cpp
+++ b/source/blood/src/blood.cpp
@@ -1926,6 +1926,11 @@ void GameInterface::FreeGameData()
     ShutDown();
 }
 
+void GameInterface::UpdateScreenSize()
+{
+    viewResizeView(gViewSize);
+}
+
 
 ::GameInterface* CreateInterface()
 {
diff --git a/source/blood/src/blood.h b/source/blood/src/blood.h
index b62d90f4e..9794cd5c2 100644
--- a/source/blood/src/blood.h
+++ b/source/blood/src/blood.h
@@ -84,6 +84,7 @@ struct GameInterface : ::GameInterface
 {
 	void faketimerhandler() override;
 	int app_main() override;
+	void UpdateScreenSize() override;
 	void FreeGameData() override;
 	bool validate_hud(int) override;
 	void set_hud_layout(int size) override;
diff --git a/source/build/include/baselayer.h b/source/build/include/baselayer.h
index 2fda1fa88..04386c3e2 100644
--- a/source/build/include/baselayer.h
+++ b/source/build/include/baselayer.h
@@ -105,6 +105,7 @@ struct GameInterface
 	virtual ~GameInterface() {}
 	virtual void faketimerhandler() {} // This is a remnant of older versions, but Blood backend has not updated yet.
 	virtual int app_main() = 0;
+	virtual void UpdateScreenSize() {}
 	virtual void FreeGameData() {}
 	virtual bool validate_hud(int) = 0;
 	virtual void set_hud_layout(int size) = 0;
diff --git a/source/common/inputstate.cpp b/source/common/inputstate.cpp
index 791899f39..044776da8 100644
--- a/source/common/inputstate.cpp
+++ b/source/common/inputstate.cpp
@@ -67,6 +67,22 @@ void I_StartTic();
 
 int32_t handleevents(void)
 {
+	// fullscreen toggle has been requested
+	if (setmodeneeded)
+	{
+		setmodeneeded = false;
+		screen->ToggleFullscreen(fullscreen);
+		V_OutputResized(screen->GetWidth(), screen->GetHeight());
+	}
+
+	// change the view size if needed
+	if (setsizeneeded)
+	{
+		videoSetGameMode(vid_fullscreen, SCREENWIDTH, SCREENHEIGHT, 32, 1);
+		if (gi) gi->UpdateScreenSize();
+		setsizeneeded = false;
+	}
+
 	timerUpdateClock();
 
 	// The mouse wheel is not a real key so in order to be "pressed" it may only be cleared at the end of the tic (or the start of the next.)
diff --git a/source/common/rendering/v_video.cpp b/source/common/rendering/v_video.cpp
index c323fd1af..1986b85ad 100644
--- a/source/common/rendering/v_video.cpp
+++ b/source/common/rendering/v_video.cpp
@@ -515,7 +515,7 @@ void V_UpdateModeSize (int width, int height)
 void V_OutputResized (int width, int height)
 {
 	V_UpdateModeSize(width, height);
-//	setsizeneeded = true;
+	setsizeneeded = true;
 	C_NewModeAdjust();
 }
 
diff --git a/source/common/rendering/v_video.h b/source/common/rendering/v_video.h
index d4e1158e4..0da33a170 100644
--- a/source/common/rendering/v_video.h
+++ b/source/common/rendering/v_video.h
@@ -434,6 +434,8 @@ void ScaleWithAspect(int &w, int &h, int Width, int Height);
 int GetUIScale(int altval);
 int GetConScale(int altval);
 
+extern bool setsizeneeded, setmodeneeded;
+
 EXTERN_CVAR(Int, uiscale);
 EXTERN_CVAR(Int, con_scaletext);
 EXTERN_CVAR(Int, con_scale);
diff --git a/source/duke3d/src/duke3d.h b/source/duke3d/src/duke3d.h
index 241fce099..18e49b7bd 100644
--- a/source/duke3d/src/duke3d.h
+++ b/source/duke3d/src/duke3d.h
@@ -143,6 +143,7 @@ static inline int32_t G_DefaultActorHealth(int spriteNum)
 struct GameInterface : ::GameInterface
 {
 	int app_main() override;
+	void UpdateScreenSize() override;
 	void FreeGameData() override;
 	bool validate_hud(int) override;
 	void set_hud_layout(int size) override;
diff --git a/source/duke3d/src/game.cpp b/source/duke3d/src/game.cpp
index e91e42e98..f31e0eaa9 100644
--- a/source/duke3d/src/game.cpp
+++ b/source/duke3d/src/game.cpp
@@ -6441,6 +6441,11 @@ void GameInterface::FreeGameData()
     G_Cleanup();
 }
 
+void GameInterface::UpdateScreenSize()
+{
+    G_UpdateScreenArea();
+}
+
 ::GameInterface* CreateInterface()
 {
 	return new GameInterface;
diff --git a/source/exhumed/src/exhumed.cpp b/source/exhumed/src/exhumed.cpp
index 5f1eea39c..cb741207a 100644
--- a/source/exhumed/src/exhumed.cpp
+++ b/source/exhumed/src/exhumed.cpp
@@ -3286,6 +3286,11 @@ bool GameInterface::CanSave()
     return !bRecord && !bPlayback && !bPause && !bInDemo && nTotalPlayers == 1;
 }
 
+void GameInterface::UpdateScreenSize()
+{
+    Powerslave::UpdateScreenSize();
+}
+
 
 ::GameInterface* CreateInterface()
 {
diff --git a/source/exhumed/src/exhumed.h b/source/exhumed/src/exhumed.h
index eb637238b..94cf28fe0 100644
--- a/source/exhumed/src/exhumed.h
+++ b/source/exhumed/src/exhumed.h
@@ -273,6 +273,7 @@ void G_DoAutoload(const char* dirname);
 struct GameInterface : ::GameInterface
 {
     int app_main() override;
+    void UpdateScreenSize() override;
     bool validate_hud(int) override { return true;  }
     void set_hud_layout(int size) override {}
     void set_hud_scale(int size) override {}
diff --git a/source/rr/src/duke3d.h b/source/rr/src/duke3d.h
index afd4db0cd..9b33fa3f7 100644
--- a/source/rr/src/duke3d.h
+++ b/source/rr/src/duke3d.h
@@ -146,6 +146,7 @@ static inline int32_t G_DefaultActorHealth(int spriteNum)
 struct GameInterface : ::GameInterface
 {
 	int app_main() override;
+	void UpdateScreenSize() override;
 	void FreeGameData() override;
 	bool validate_hud(int) override;
 	void set_hud_layout(int size) override;
diff --git a/source/rr/src/game.cpp b/source/rr/src/game.cpp
index 1001b35fc..ed8cfb262 100644
--- a/source/rr/src/game.cpp
+++ b/source/rr/src/game.cpp
@@ -7888,6 +7888,11 @@ void GameInterface::FreeGameData()
     G_Cleanup();
 }
 
+void GameInterface::UpdateScreenSize()
+{
+    G_UpdateScreenArea();
+}
+
 ::GameInterface* CreateInterface()
 {
 	return new GameInterface;
diff --git a/source/sw/src/game.cpp b/source/sw/src/game.cpp
index 06d21cedb..138e118c6 100644
--- a/source/sw/src/game.cpp
+++ b/source/sw/src/game.cpp
@@ -3958,6 +3958,10 @@ void GameInterface::FreeGameData()
     TerminateLevel();
 }
 
+void GameInterface::UpdateScreenSize()
+{
+    SetupAspectRatio();
+}
 
 
 #if 0 // the message input needs to be moved out of the game code!
diff --git a/source/sw/src/game.h b/source/sw/src/game.h
index b6e480834..adb31e41d 100644
--- a/source/sw/src/game.h
+++ b/source/sw/src/game.h
@@ -2430,6 +2430,7 @@ void LoadSaveMsg(const char *msg);
 struct GameInterface : ::GameInterface
 {
 	int app_main() override;
+    void UpdateScreenSize() override;
     void FreeGameData() override;
     bool validate_hud(int) override;
 	void set_hud_layout(int size) override;