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diff --git a/util/fbcompose/OpenGLUtility.hh b/util/fbcompose/OpenGLUtility.hh
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+/** OpenGLUtility.hh file for the fluxbox compositor. */
+
+// Copyright (c) 2011 Gediminas Liktaras (gliktaras at gmail dot com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+
+#ifndef FBCOMPOSITOR_OPENGLUTILITY_HH
+#define FBCOMPOSITOR_OPENGLUTILITY_HH
+
+
+#include <GL/glew.h>
+#include <GL/gl.h>
+
+#include <X11/Xlib.h>
+
+
+namespace FbCompositor {
+
+    class BaseScreen;
+
+
+    //--- FUNCTIONS ------------------------------------------------------------
+
+    /** Converts screen coordinates to OpenGL coordinates. */
+    void toOpenGLCoords(int screen_width, int screen_height, int x, int y, int width, int height,
+                        GLfloat *x_low_return, GLfloat *x_high_return, GLfloat *y_low_return, GLfloat *y_high_return);
+
+    /** Converts screen coordinates to OpenGL coordinates. */
+    void toOpenGLCoords(int screen_width, int screen_height, XRectangle rect,
+                        GLfloat *x_low_return, GLfloat *x_high_return, GLfloat *y_low_return, GLfloat *y_high_return);
+
+}
+
+#endif  // FBCOMPOSITOR_OPENGLUTILITY_HH