1UNTITLED LOCAL UNTITLED
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4 glutSetWindow — Select the <i>current window</i>
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7 OpenGLUT - window
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10 #include <openglut.h>
11 void
13 glutSetWindow(int ID);
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16 ID Window identifier
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19 Sets the current window to ID.
20 All OpenGL rendering goes to the current window . Many OpenGLUT func‐
22 tions also implicitly use the current window .
23 Many OpenGLUT callback operations are tied to a window. When your call‐
25 back is invoked, OpenGLUT will set that particular window to be the cur‐
26 rent window . However, some callbacks---such as that registered via
27 glutIdleFunc()---do not have associated windows. If a callback is not
28 associated to a particular window, then when OpenGLUT invokes that call‐
29 back you should always use glutSetWindow() to select the appropriate
30 window before doing any OpenGL rendering or doing any OpenGLUT window-
31 related operations.
32 There may be cases when you can get away with assuming that the current
34 window is unchanged since some prior time, but OpenGLUT has consider‐
35 able liberaty with respect to when it invokes your functions. Also, your
36 program may add more windows or more operations on other windows as you
37 develop it.
38 Lastly, this is a convenient way to select among multiple windows for
40 drawing without actually waiting for that window's display callback.
41 Simply set the current window and draw immediately. This is not
42 always advisable, but may be practical.
43 It is an error to set the current window to a non-existant window
45 (e.g., one that you have closed). A warning will be printed on stderr
46 if you try to do so, and the current window should be unchanged.
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49 glutGetWindow(3)
50 Epoch