CentOS 7.0 - man page for glutreshapefunc (centos section 3)
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glutReshapeFunc -- Sets the Reshape callback for the current window.
OpenGLUT - windowcallback
glutReshapeFunc(void( *callback )( int w, int h ));
callback Client function for reshape-window event.
This registers a function with OpenGLUT, which OpenGLUT will invoke whenever the window is
reshaped or resized. Your callback is only invoked when the host window system has actually
changed the window size.
The parameters to your callback are the new width and height for your window.
If you do not provide a reshape callback, OpenGLUT will simply call glViewport(0,0, w,
This callback is bound to the current window .
To ask OpenGLUT about the present dimensions of the current window , you can use glut-
Unlike other callbacks, GLUT has an active default behavior if you do not set this.
(Most event types passively do nothing if you do not specify a callback to handle them.)
The reshape callback should always be called, if registered, when your window is first cre-
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