Type, API. License · X Consortium. Website, FreeGLUT is an open-source alternative to the OpenGL Utility Toolkit (GLUT) library. These kept the API (all gluts functions are usually implemented exactly with the Two of the most common GLUT replacements are OpenGLUT and freeGLUT. It looks to me that Ubuntu has provided everything that the original web site http:// has provided. The api documentation.

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All the stuff in the GLUT tutorial is exactly the same, apart from one detail when using subwindows.

To draw shapes with shaders OpenGL 2 and laterone need to upload vertices and associated freeglit vectors and texture coordinates to vertex attributes of your shaders.

If the window status callback for a window is disabled and later re-enabled, the xpi status of the window is undefined; any change in window window status will be reported, that is if you disable a window status callback and re-enable the callback, you are guaranteed the next window status change will be reported. The glutLeaveMainLoop function causes freeglut to stop the event loop.

In GLUT, there was absolutely no way for the application programmer to have control return from the glutMainLoop function to the calling function.

Freeglut documentation

Freeglut calls the idle callback when there are vreeglut inputs from the user. The glutStrokeLengthf function returns the width in model units of a string of characters in the specified stroke font.

Thus the return value may differ from the sum of the character widths returned by a series of calls to glutStrokeWidth.


Also I was only able to set GameMode when I provided all four fields in mode string. The users callback is passed a format string and a variable argument list that can be passed to functions such as printf.

zpi Freeglut sets the current window to the window which is active when the callback is invoked. The main differences that I found are as follows:. The coordinates taken by glutInitPosition and a;ias well as the coordinates provided by FreeGLUT when it calls the glutPositionFunc callback, specify the top-left of the non-client area of the window. The glutTabletMotionFunc function is not implemented in freeglutalthough the library does “answer the mail” to the extent that a call to the function will not produce an error.

This allows the application to control its own event loop and still use the freeglut windowing system. This most likely only helps if you already have a basic understanding of how to use the GL. Complaints about the lack of control on the event frreeglut are abundant on the web.

API/ABI changes review for freeglut

GLUT was conceived by Mark Kilgard with the goal of providing a simple, yet powerful enough, toolkit to deal with the intricacies of the windowing system when building OpenGL applications. It does not use any display lists in it rendering in bitmap fonts. The glutStrokeWidthf function returns the width in model units of a single character in the specified stroke font.

The glutStrokeWidthf function returns the width of the given character in the specified stroke font. The returned value is an integer. Things have evolved a little since then and some features are missing. In this case, you should use this specific reference: For more information about helping out, see the Help Out page and join the freeglut-developer mailing list.


The glutBitmapCharacter function renders the given character in the specified bitmap font. I think that by “Glut” you mean “Freeglut”. The glutStrokeLength function returns the width in model units of a string of frreglut in the specified stroke font, rounded to an int. These are two open source projects. Before the first call to glutStrokeCharacter the application program should call the OpenGL transformation positioning and scaling functions to set the position of the character in the window.

Foley, which is still an excellent read but it doesn’t focus much on real time rendering.


If the string contains one or more carriage returns, freeglut calculates the widths in pixels of the lines separately and returns the largest width. It will call any application callback functions as required to process mouse clicks, mouse motion, key presses, and so on.

Application programmers should note that if they have specified the “continue execution” action on window closure, freeglut will continue to call the idle callback after the user has closed a window by clicking on the “x” in the window header bar. This is zpi feature of freeglut and can be adjusted if so desired.