glXSelectEvent man page on RedHat
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GLXSELECTEVENT(3G) OpenGL Manual GLXSELECTEVENT(3G)
NAME
glXSelectEvent - select GLX events for a window or a GLX pixel buffer
C SPECIFICATION
void glXSelectEvent(Display * dpy, GLXDrawable draw,
unsigned long event_mask);
PARAMETERS
dpy
Specifies the connection to the X server.
draw
Specifies a GLX drawable. Must be a GLX pixel buffer or a window.
event_mask
Specifies the events to be returned for draw.
DESCRIPTION
glXSelectEvent sets the GLX event mask for a GLX pixel buffer or a
window. Calling glXSelectEvent overrides any previous event mask that
was set by the client for draw. Note that it does not affect the event
masks that other clients may have specified for draw since each client
rendering to draw has a separate event mask for it.
Currently, only one GLX event, GLX_PBUFFER_CLOBBER_MASK, can be
selected. The following data is returned to the client when a
GLX_PBUFFER_CLOBBER_MASK event occurs:
typedef struct {
┌──────────────────────────┬──────────────────────────┐
│int event_type; │ /* GLX_DAMAGED or │
│ │ GLX_SAVED */ │
├──────────────────────────┼──────────────────────────┤
│int draw_type; │ /* GLX_WINDOW or │
│ │ GLX_PBUFFER */ │
├──────────────────────────┼──────────────────────────┤
│unsigned long serial; │ /* # of last request │
│ │ processed by server */ │
├──────────────────────────┼──────────────────────────┤
│Bool send_event; │ /* true if this came for │
│ │ SendEvent request */ │
├──────────────────────────┼──────────────────────────┤
│Display *display; │ /* display the event was │
│ │ read from */ │
├──────────────────────────┼──────────────────────────┤
│GLXDrawable drawable; │ /* i.d. of Drawable */ │
├──────────────────────────┼──────────────────────────┤
│unsigned int buffer_mask; │ /* mask indicating │
│ │ affected buffers */ │
├──────────────────────────┼──────────────────────────┤
│int x, y; │ │
├──────────────────────────┼──────────────────────────┤
│int width, height; │ │
├──────────────────────────┼──────────────────────────┤
│int count; │ /* if nonzero, at least │
│ │ this many more */ │
└──────────────────────────┴──────────────────────────┘
} GLXPbufferClobberEvent; The valid bit masks used in buffer_mask are:
┌────────────────────────────────┬───────────────────────────────────────┐
│ │ │
│ Bitmask │ Corresponding │
│ │ Buffer │
│ │ │
├────────────────────────────────┼───────────────────────────────────────┤
│GLX_FRONT_LEFT_BUFFER_BIT │ Front left color buffer │
├────────────────────────────────┼───────────────────────────────────────┤
│GLX_FRONT_RIGHT_BUFFER_BIT │ Front right color buffer │
├────────────────────────────────┼───────────────────────────────────────┤
│GLX_BACK_LEFT_BUFFER_BIT │ Back left color buffer │
├────────────────────────────────┼───────────────────────────────────────┤
│GLX_BACK_RIGHT_BUFFER_BIT │ Back right color buffer │
├────────────────────────────────┼───────────────────────────────────────┤
│GLX_AUX_BUFFERS_BIT │ Auxiliary buffer │
├────────────────────────────────┼───────────────────────────────────────┤
│GLX_DEPTH_BUFFER_BIT │ Depth buffer │
├────────────────────────────────┼───────────────────────────────────────┤
│GLX_STENCIL_BUFFER_BIT │ Stencil buffer │
├────────────────────────────────┼───────────────────────────────────────┤
│GLX_ACCUM_BUFFER_BIT │ Accumulation buffer │
└────────────────────────────────┴───────────────────────────────────────┘
A single X server operation can cause several buffer clobber events to
be sent. (e.g., a single GLX pixel buffer may be damaged and cause
multiple buffer clobber events to be generated). Each event specifies
one region of the GLX drawable that was affected by the X Server
operation. The buffer_mask field indicates which color buffers and
ancillary buffers were affected. All the buffer clobber events
generated by a single X server action are guaranteed to be contiguous
in the event queue. The conditions under which this event is generated
and the event_type varies, depending on the type of the GLX drawable.
When the GLX_AUX_BUFFERS_BIT is set in buffer_mask, then aux_buffer is
set to indicate which buffer was affected. If more than one aux buffer
was affected, then additional events are generated as part of the same
contiguous event group. Each additional event will have only the
GLX_AUX_BUFFERS_BIT set in buffer_mask, and the aux_buffer field will
be set appropriately. For nonstereo drawables,
GLX_FRONT_LEFT_BUFFER_BIT and GLX_BACK_LEFT_BUFFER_BIT are used to
specify the front and back color buffers.
For preserved GLX pixel buffers, a buffer clobber event with type
GLX_SAVED is generated whenever the contents of the GLX pixel buffer is
moved out of offscreen memory. The event(s) describes which portions of
the GLX pixel buffer were affected. Clients who receive many buffer
clobber events, referring to different save actions, should consider
freeing the GLX pixel buffer resource in order to prevent the system
from thrashing due to insufficient resources.
For an unpreserved GLXPbuffer, a buffer clobber event, with type
GLX_DAMAGED, is generated whenever a portion of the GLX pixel buffer
becomes invalid. The client may wish to regenerate the invalid portions
of the GLX pixel buffer.
For Windows, buffer clobber events, with type GLX_SAVED, occur whenever
an ancillary buffer, associated with the window, gets clobbered or
moved out of off-screen memory. The event contains information
indicating which color buffers and ancillary buffers\(emand which
portions of those buffers\(emwere affected.
NOTES
glXSelectEvent is available only if the GLX version is 1.3 or greater.
If the GLX version is 1.1 or 1.0, the GL version must be 1.0. If the
GLX version is 1.2, then the GL version must be 1.1. If the GLX version
is 1.3, then the GL version must be 1.2.
ERRORS
GLXBadDrawable is generated if draw is not a valid window or a valid
GLX pixel buffer.
ASSOCIATED GETS
glXGetSelectedEvent()
SEE ALSO
glXCreatePbuffer()
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLXSELECTEVENT(3G)
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