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glutreshapefunc(3) [centos man page]

glutReshapeFunc -- Sets the Reshape callback for the current window. LIBRARY
OpenGLUT - windowcallback SYNOPSIS
#include <openglut.h> void glutReshapeFunc(void( *callback )( int w, int h )); PARAMETERS
callback Client function for reshape-window event. DESCRIPTION
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, h). This callback is bound to the current window . To ask OpenGLUT about the present dimensions of the current window , you can use glutGet(). CAVEATS
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 created. SEE ALSO
glutGet(3) glutReshapeWindow(3) Epoch

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glutSetWindow -- Select the <i>current window</i> LIBRARY
OpenGLUT - window SYNOPSIS
#include <openglut.h> void glutSetWindow(int ID); PARAMETERS
ID Window identifier DESCRIPTION
Sets the current window to ID. All OpenGL rendering goes to the current window . Many OpenGLUT functions also implicitly use the current window . Many OpenGLUT callback operations are tied to a window. When your callback is invoked, OpenGLUT will set that particular window to be the current window . However, some callbacks---such as that registered via glutIdleFunc()---do not have associated windows. If a callback is not associated to a particular window, then when OpenGLUT invokes that callback you should always use glutSetWindow() to select the appro- priate window before doing any OpenGL rendering or doing any OpenGLUT window-related operations. There may be cases when you can get away with assuming that the current window is unchanged since some prior time, but OpenGLUT has con- siderable liberaty with respect to when it invokes your functions. Also, your program may add more windows or more operations on other win- dows as you develop it. Lastly, this is a convenient way to select among multiple windows for drawing without actually waiting for that window's display callback. Simply set the current window and draw immediately. This is not always advisable, but may be practical. It is an error to set the current window to a non-existant window (e.g., one that you have closed). A warning will be printed on stderr if you try to do so, and the current window should be unchanged. SEE ALSO
glutGetWindow(3) Epoch
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