Turn off desktop compositing in Windows ("Aero") for Radiant.

Otherwise, "hall of mirrors" effect takes place in the OpenGL viewports.
This fix is a real hack.  It's actually borrowed from other Radiants such
as NetRadiant.  I'd like to fix the underlying issue someday so that Aero
can be used with Radiant.


git-svn-id: svn://svn.icculus.org/gtkradiant/GtkRadiant/trunk@433 8a3a26a2-13c4-0310-b231-cf6edde360e5

radiant/main.cpp

@@ -429,6 +429,33 @@ int main( int argc, char* argv[] ) {
 	char *libgl, *ptr;
 	int i, j, k;
 
+  /*
+    Rambetter on Fri Jan 21, 2011:
+
+    People with recent NVIDIA cards and Windows 7 (Aero) are complaining about "hall of mirrors"
+    effect in the OpenGL viewports.  The code below is borrowed from NetRadiant to address
+    this issue.  This change turns off desktop compositing (globally) while Radiant is running.
+    It's a real hack but the "correct" fix is very involving, so until the underlying problem
+    is addressed we need this code here.  I don't know for sure what the underlying problem is,
+    but I have a hunch it's the version of gtkglext.dll we're using.
+  */
+
+#ifdef _WIN32
+  HMODULE lib;
+  lib = LoadLibrary("dwmapi.dll");
+  if (lib != 0)
+  {
+    void (WINAPI *qDwmEnableComposition) (bool bEnable) =
+      (void (WINAPI *) (bool bEnable)) GetProcAddress(lib, "DwmEnableComposition");
+    if (qDwmEnableComposition)
+    {
+      qDwmEnableComposition(FALSE);
+    }
+    FreeLibrary(lib);
+  }
+#endif
+
+
   /*
     Rambetter on Sat Nov 13, 2010: