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glutswapbuffers(3) [centos man page]

glutSwapBuffers -- Swaps the buffers for the current window. LIBRARY
OpenGLUT - window SYNOPSIS
#include <openglut.h> void glutSwapBuffers(void); DESCRIPTION
This function signals to OpenGLUT that you are done drawing to the current window for now. If your window is double-buffered ( GLUT_DOU- BLE param to glutInitDisplayMode()), then OpenGLUT will swap the front buffer with the back buffer. This also computes your current frame-rate and prints the result on stderr if indicated by the GLUT_FPS environment variable. The com- puted value is not necessarily the total frame rate, if you have multiple windows, as the statistic is the total number of buffer-swaps for the entire program. CAVEATS
This function has no effect if your window is GLUT_SINGLE . Frame rate is only calculated for double-buffered windows. TODO
How does this interact with overlays? Consider making GLUT_FPS keep per-window stats in a multi-window program. SEE ALSO
glutPostRedisplay(3) glutPostOverlayRedisplay(3) glutPostWindowRedisplay(3) glutPostWindowOverlayRedisplay(3) glutInitDisplaymode(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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