Add code to test leaving game mode to return to window mode...

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37902 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/tests/kits/opengl/glut/game_mode/game_mode.c

@@ -139,6 +139,16 @@ keyboard(unsigned char key, int x, int y)
 				init();
 			break;
 		}
+
+		case 'l':
+		case 'L': {
+			// return to default window
+			glutLeaveGameMode();
+			if (!glutGetWindow())
+				// exit if none
+				exit(0);
+			break;
+		}
 	}
 }