FREEGLUT API PDF
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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GLUT was conceived by Mark Kilgard with the goal of providing a simple, yet powerful enough, toolkit to deal with the vreeglut of the windowing system when building OpenGL applications. In my opinion GLUT was a very effective solution and completely fits the bill.
As far as I know, GLUT is still the simplest toolkit around and yet it does most of what is needed for simple prototypes. GLUT however is not free of criticism.
Complaints about the lack of control on the event loop are abundant on the web.
Furthermore GLUT last release was back in the last century…. Things have evolved a little since then and some features are missing. These kept the API all gluts functions are usually implemented exactly with the same name but improved and extended it to address the above mentioned issues. These are two open source projects.
In here we are going to focus on freeglut. All the stuff in the GLUT tutorial is exactly the same, apart from one detail when using subwindows. feeglut
GLUT and FreeGLUT
Even the include is the same if you use glut. The main differences that I found are as follows:. Although multisampling is not the most sophisticated anti-aliasing method it does visually enhance your renderings with virtually no cost regarding implementation. The first image shows a rendering without multisampling, the second image with multisampling enabled.
Freeglut seems to only work when the GameMode resolution is set to the full screen. My attempts at setting the GameMode to pai lower frdeglut failed.
Also I was only able to set GameMode when I provided all four fields in mode string. Leaving one field out did not change from window mode to GameMode. Furthermore, freeglut seems to loose the window settings when returning from the GameMode. Hence a call to glutSetWindow is required, as shown in the code snippet below:.
Freeglut extends the original spec and it includes the possibility to register a callback function for the mouse wheel. This function will be called when the mousewheel moves for each notch. Note the mouse wheel still functions as the middle button, but those events are treated as regular press and release mouse button events.
Freeglut provides full control of the event loop.
One of the major complaints about the original GLUT was that when a window was closed the application was shutdown automatically. This prevented freglut execution of cleanup code, or could cause problems in multiple window setups.
With freeglut it is possible to specify what happens when a user closes a window. The available options are:. With GLUT, the printf would never be executed. With freeglut the main loop terminates and the application regains control, hence the printf will be executed. Be careful when using this function. In my tests freeglut continued to process the events that were already queued so performing any cleanup before actually getting out of the event loop could crash the application.
Finally freeglut allows us to write our own event loop cycle. The function glutMainLoopEvent processes a single iteration of the event loop.
Using this function with the idle func does not seem to work very well. If you want to write your own event loop I suggest you drop the idle func and use the following event processing cycle:.
Another benefit of using freeglut is the ability to create OpenGL contexts with profiles. This is achieved with the following functions:.
The possible values for the profile are: What the content of renderScene? Libs that work great with OpenGL Next: Furthermore GLUT last release was back in the last century… Things have evolved a little since then and some features are missing. The main differences that I found are as follows: Game Mode Freeglut seems to only work when the GameMode resolution is set to the full screen. My attempts at setting the GameMode to a lower resolution failed Also I was only able to set GameMode when I provided all four fields in mode string.
Hence a call to glutSetWindow is required, as shown in the code snippet below: The registration function is: Main Loop Freeglut provides full control of the event loop. The available options are: The application continues as if nothing happened.
This is useful for multiple window setups. If the application has a single window then this option behaves exactly as the first option.
Freeglut provides yet another useful function to end the event loop: A possible usage of this function is when the user presses the ESC key. So instead of having: Freeglut even provides a callback registration for when a window is closed: If you want to write your own event loop I suggest you drop the idle func and use the following event processing cycle: This is achieved with the following functions: For instance to set a compatibility context with OpenGL 3.
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API/ABI changes review for freeglut