Directly toggle fullscreen if keybind pressed in key.Poll()

This moves the responsibility of toggling fullscreen when any of the
three toggle fullscreen keybinds are pressed (F11, Alt+Enter, Alt+F)
directly into key.Poll() itself, and not its caller (which is main() -
more specifically, fixedloop()). Furthermore, the fullscreen toggle
itself has been moved to a separate function that key.Poll() just calls,
to prevent cluttering key.Poll() with more business logic (the function
is already quite big enough as it is).

As part of my work in re-removing the 1-frame input delay in #535, I'm
moving the callsite of key.Poll() around, and I don't want to have to
lug this block of code around with it. I'd rather refactor it upfront
than touch any more lines than necessary in that PR.

desktop_version/src/KeyPoll.cpp

@@ -41,7 +41,6 @@ KeyPoll::KeyPoll(void)
 	leftbutton=0; rightbutton=0; middlebutton=0;
 	mx=0; my=0;
 	resetWindow = 0;
-	toggleFullscreen = false;
 	pressedbackspace=false;
 
 	useFullscreenSpaces = false;
@@ -78,9 +77,27 @@ bool KeyPoll::textentry(void)
 	return SDL_IsTextInputActive() == SDL_TRUE;
 }
 
+void KeyPoll::toggleFullscreen(void)
+{
+	if (graphics.screenbuffer != NULL)
+	{
+		graphics.screenbuffer->toggleFullScreen();
+	}
+
+	keymap.clear(); /* we lost the input due to a new window. */
+	if (game.glitchrunnermode)
+	{
+		game.press_left = false;
+		game.press_right = false;
+		game.press_action = true;
+		game.press_map = false;
+	}
+}
+
 void KeyPoll::Poll(void)
 {
 	bool altpressed = false;
+	bool fullscreenkeybind = false;
 	SDL_Event evt;
 	while (SDL_PollEvent(&evt))
 	{
@@ -106,7 +123,7 @@ void KeyPoll::Poll(void)
 			bool f11pressed = evt.key.keysym.sym == SDLK_F11;
 			if ((altpressed && (returnpressed || fpressed)) || f11pressed)
 			{
-				toggleFullscreen = true;
+				fullscreenkeybind = true;
 			}
 
 			if (textentry())
@@ -321,6 +338,11 @@ void KeyPoll::Poll(void)
 			break;
 		}
 	}
+
+	if (fullscreenkeybind)
+	{
+		toggleFullscreen();
+	}
 }
 
 bool KeyPoll::isDown(SDL_Keycode key)

desktop_version/src/KeyPoll.h

@@ -38,7 +38,7 @@ public:
 	bool resetWindow;
 
 	bool quitProgram;
-	bool toggleFullscreen;
+	void toggleFullscreen(void);
 
 	int sensitivity;
 

desktop_version/src/main.cpp

@@ -454,20 +454,6 @@ static void inline fixedloop(void)
     NETWORK_update();
 
     key.Poll();
-    if(key.toggleFullscreen)
-    {
-        gameScreen.toggleFullScreen();
-        key.toggleFullscreen = false;
-
-        key.keymap.clear(); //we lost the input due to a new window.
-        if (game.glitchrunnermode)
-        {
-            game.press_left = false;
-            game.press_right = false;
-            game.press_action = true;
-            game.press_map = false;
-        }
-    }
 
     if(!key.isActive)
     {