Added an output GL window that reproduces the destination (refresh still not working).

Window can be toggled on/off.

OutputGLWindow.cpp

@@ -0,0 +1,36 @@
+/*
+ * OutputGLWindow.cpp
+ *
+ * (c) 2014 Sofian Audry -- info(@)sofianaudry(.)com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "OutputGLWindow.h"
+
+OutputGLWindow::OutputGLWindow(QWidget* parent, const QGLWidget * shareWidget) : QDialog(parent)
+{
+//  setModal(false);
+  resize(320,240);
+
+  canvas = new DestinationGLCanvas(this, shareWidget);
+  canvas->setFocusPolicy(Qt::ClickFocus);
+  canvas->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+  canvas->setMinimumSize(320, 240);
+}
+
+void OutputGLWindow::updateCanvas() {
+  qDebug() << "Update output canvas" << endl;
+  canvas->updateCanvas();
+}