Add proper fullscreen and resolution changing support using XRandR. This makes XRandR mandatory, but I don't see any reason why we can't do that, and providing alternatives would be difficult at best for little payoff.

stepmania/src/archutils/Unix/X11Helper.cpp

@@ -1,7 +1,7 @@
 #include "global.h"
 #include "X11Helper.h"
 
-#include <X11/Xlib.h>		// Display, Window
+#include <X11/Xlib.h>
 
 #include "RageLog.h"
 #include "RageDisplay.h"
@@ -86,7 +86,7 @@ static bool pApplyMasks()
 	return true;
 }
 
-bool X11Helper::MakeWindow( int screenNum, int depth, Visual *visual, int width, int height )
+bool X11Helper::MakeWindow( int screenNum, int depth, Visual *visual, int width, int height, bool overrideRedirect )
 {
 	vector<long>::iterator i;
 	
@@ -116,9 +116,20 @@ bool X11Helper::MakeWindow( int screenNum, int depth, Visual *visual, int width,
 
 	winAttribs.colormap = XCreateColormap( Dpy, RootWindow(Dpy, screenNum), visual, AllocNone );
 
-	Win = XCreateWindow( Dpy, RootWindow(Dpy, screenNum), 0, 0, width,
-		height, 0, depth, InputOutput, visual,
-		CWBorderPixel | CWColormap | CWEventMask, &winAttribs );
+	if( overrideRedirect )
+	{
+		winAttribs.override_redirect = True;
+		Win = XCreateWindow( Dpy, RootWindow(Dpy, screenNum), 0, 0, width,
+			height, 0, depth, InputOutput, visual,
+			CWBorderPixel | CWColormap | CWEventMask | CWOverrideRedirect, &winAttribs );
+	}
+	else
+	{
+		Win = XCreateWindow( Dpy, RootWindow(Dpy, screenNum), 0, 0, width,
+			height, 0, depth, InputOutput, visual,
+			CWBorderPixel | CWColormap | CWEventMask, &winAttribs );
+	}
+			
 
 	g_bHaveWin = true;
 

stepmania/src/archutils/Unix/X11Helper.h

@@ -26,8 +26,9 @@ namespace X11Helper
 	// (Re)create the window on the screen of this number with this depth,
 	// this visual type, this width (optional -- you can resize the window
 	// in your callback later), and this height (optional).
+	// Also, whether to enable override redirect on the window.
 	bool MakeWindow(int screenNum, int depth, Visual *visual,
-					int width=32, int height=32);
+					int width=32, int height=32, bool overrideRedirect=false);
 
 	// Unmask one X event type mask thingy (XSelectInput() arg 3) on the
 	// current window. Masked/unmasked events will carry between windows.