1.4 API Version 3

Further feedback lead to the development of GLUT API version 3. Additions to the GLUT API version 2 are:

• The   glutMenuStateFunc has been deprecated in favor of the   glutMenuStatusFunc.
• glutFullScreen requests full screen top-level windows.
• Three additional Helvetica bitmap fonts.
• Implementations should enforce not allowing any modifications to menus while menus are in use.
•   glutBitmapWidth and   glutStrokeBitmap return the widths of individual characters.
•   glutGetModifiers called during a keyboard, mouse, or special callback returns the modifiers (Shift, Ctrl, Alt) held down when the mouse or keyboard event was generated.
• Access to per-window transparent overlays when overlay hardware is supported. The routines added are   glutEstablishOverlay,   glutRemoveOverlay,   glutShowOverlay,   glutHideOverlay,   glutUseOverlay,   glutLayerGet, and   glutPostOverlayRedisplay.
• A new display mode called   GLUT_LUMINANCE using OpenGL's RGBA color model, but that has no green or blue components. The red component is converted to an index and looked up in a writable colormap to determine displayed colors. See   glutInitDisplayMode.

Another change in GLUT 3.0 that may require source code modification to pre-3.0 GLUT programs. GLUT 3.0 no longer lets a window be shown without a display callback registered. This change makes sure windows are not displayed on the screen without the GLUT application providing a way for them to be rendered. In conjunction with this change,   glutDisplayFunc no longer allows NULL to deregister a display callback. While there is no longer a way to deregister a display callback, you can still change the change the display callback routine with subsequent calls to glutDisplayFunc.

The display mode mask parameter for glutInitDisplayMode and the milliseconds parameter for glutTimerFunc are now of type unsigned int (previously unsigned long).