/* Copyright (c) Mark J. Kilgard, 1994, 1995, 1996. */
/* This program is freely distributable without licensing fees
and is provided without guarantee or warrantee expressed or
implied. This program is -not- in the public domain. */
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <assert.h>
#ifdef __sgi
#include <bstring.h> /* prototype for bzero used by FD_ZERO */
#endif
#ifdef AIXV3
#include <sys/select.h> /* select system call interface */
#endif
#include <sys/types.h>
#ifndef __vms
#include <sys/time.h>
#endif
#include <X11/Xlib.h>
#include <X11/keysym.h>
#ifdef __hpux
/* XXX Bert Gijsbers <bert@mc.bio.uva.nl> reports that HP-UX
needs different keysyms for the End, Insert, and Delete keys
to work on an HP 715. It would be better if HP generated
standard keysyms for standard keys. */
#include <X11/HPkeysym.h>
#endif
#ifdef __vms
#include <ssdef.h>
#include <psldef.h>
extern int SYS$CLREF(int efn);
extern int SYS$SETIMR(unsigned int efn, struct timeval *timeout, void *ast,
unsigned int request_id, unsigned int flags);
extern int SYS$WFLOR(unsigned int efn, unsigned int mask);
extern int SYS$CANTIM(unsigned int request_id, unsigned int mode);
#endif /* __vms */
#include <GL/glut.h>
#include "glutint.h"
static GLUTtimer *freeTimerList = NULL;
static int mappedMenuButton;
GLUTidleCB __glutIdleFunc = NULL;
GLUTtimer *__glutTimerList = NULL;
#ifdef SUPPORT_FORTRAN
GLUTtimer *__glutNewTimer;
#endif
GLUTwindow *__glutWindowWorkList = NULL;
void (*__glutUpdateInputDeviceMaskFunc) (GLUTwindow *);
Atom __glutMotifHints = None;
unsigned int __glutModifierMask = ~0; /* ~0 implies not in
core input callback. */
int __glutWindowDamaged = 0;
void
glutIdleFunc(GLUTidleCB idleFunc)
{
__glutIdleFunc = idleFunc;
}
void
glutTimerFunc(unsigned int interval, GLUTtimerCB timerFunc, int value)
{
GLUTtimer *timer, *other;
GLUTtimer **prevptr;
struct timeval now;
if (!timerFunc)
return;
if (freeTimerList) {
timer = freeTimerList;
freeTimerList = timer->next;
} else {
timer = (GLUTtimer *) malloc(sizeof(GLUTtimer));
if (!timer)
__glutFatalError("out of memory.");
}
timer->func = timerFunc;
#ifdef __vms
/* VMS time is expressed in units of 100 ns */
timer->timeout.val = interval * TICKS_PER_MILLISECOND;
#else
timer->timeout.tv_sec = (int) interval / 1000;
timer->timeout.tv_usec = (int) (interval % 1000) * 1000;
#endif
timer->value = value;
timer->next = NULL;
GETTIMEOFDAY(&now);
ADD_TIME(timer->timeout, timer->timeout, now);
prevptr = &__glutTimerList;
other = *prevptr;
while (other && IS_AFTER(other->timeout, timer->timeout)) {
prevptr = &other->next;
other = *prevptr;
}
timer->next = other;
#ifdef SUPPORT_FORTRAN
__glutNewTimer = timer; /* for Fortran binding! */
#endif
*prevptr = timer;
}
static void
handleTimeouts(void)
{
struct timeval now;
GLUTtimer *timer;
if (__glutTimerList) {
GETTIMEOFDAY(&now);
while (IS_AT_OR_AFTER(__glutTimerList->timeout, now)) {
timer = __glutTimerList;
timer->func(timer->value);
__glutTimerList = timer->next;
timer->next = freeTimerList;
freeTimerList = timer;
if (!__glutTimerList)
break;
}
}
}
void
__glutPutOnWorkList(GLUTwindow * window, int workMask)
{
if (window->workMask) {
/* Already on list; just OR in new workMask. */
window->workMask |= workMask;
} else {
/* Update work mask and add to window work list. */
window->workMask = workMask;
window->prevWorkWin = __glutWindowWorkList;
__glutWindowWorkList = window;
}
}
void
__glutPostRedisplay(GLUTwindow * window, int layerMask)
{
int shown = (layerMask == GLUT_REDISPLAY_WORK) ? window->shownState : window->overlay->shownState;
/* Post a redisplay if the window is visible (or the
visibility of the window is unknown, ie. window->visState
== -1) _and_ the layer is known to be shown. */
if (window->visState != 0 && shown)
__glutPutOnWorkList(window, layerMask);
}
void
glutPostRedisplay(void)
{
__glutPostRedisplay(__glutCurrentWindow, GLUT_REDISPLAY_WORK);
}
static GLUTeventParser *eventParserList = NULL;
/* __glutRegisterEventParser allows another module to register
to intercept X events types not otherwise acted on by the
GLUT processEvents routine. The X Input extension support
code uses an event parser for handling X Input extension
events. */
void
__glutRegisterEventParser(GLUTeventParser * parser)
{
parser->next = eventParserList;
eventParserList = parser;
}
static void
updateWindowVisibility(GLUTwindow * window, int visState)
{
if (window->shownState && visState != window->visState) {
if (window->visibility) {
window->visState = visState;
__glutSetWindow(window);
window->visibility(visState ?
GLUT_VISIBLE : GLUT_NOT_VISIBLE);
}
/* An unmap is only reported on a single window; its
descendents need to know they are no longer visible. */
if (!visState) {
GLUTwindow *child = window->children;
while (child) {
updateWindowVisibility(child, visState);
child = child->siblings;
}
}
}
}
static void
purgeStaleWindow(Window win)
{
GLUTstale **pEntry = &__glutStaleWindowList;
GLUTstale *entry = __glutStaleWindowList;
/* Tranverse singly-linked stale window list look for the
window ID. */
while (entry) {
if (entry->win == win) {
/* Found it; delete it. */
*pEntry = entry->next;
free(entry);
return;
} else {
pEntry = &entry->next;
entry = *pEntry;
}
}
}
static void
processEvents(void)
{
XEvent event, ahead;
GLUTwindow *window;
int width, height;
GLUTeventParser *parser;
do {
XNextEvent(__glutDisplay, &event);
switch (event.type) {
case MappingNotify:
XRefreshKeyboardMapping((XMappingEvent *) & event);
break;
case ConfigureNotify:
window = __glutGetWindow(event.xconfigure.window);
if (window) {
if (window->win != event.xconfigure.window) {
/* Ignore ConfigureNotify sent to the overlay planes.
GLUT could get here because overlays select for
StructureNotify events to receive DestroyNotify. */
break;
}
width = event.xconfigure.width;
height = event.xconfigure.height;
if (width != window->width || height != window->height) {
if (window->overlay) {
XResizeWindow(__glutDisplay, window->overlay->win, width, height);
}
window->width = width;
window->height = height;
__glutSetWindow(window);
/* Do not execute OpenGL out of sequence with respect
to the XResizeWindow request! */
glXWaitX();
window->reshape(width, height);
window->forceReshape = False;
}
}
break;
case Expose:
/* compress expose events */
while (XEventsQueued(__glutDisplay, QueuedAfterReading)
> 0) {
XPeekEvent(__glutDisplay, &ahead);
if (ahead.type != Expose ||
ahead.xexpose.window != event.xexpose.window)
break;
XNextEvent(__glutDisplay, &event);
}
if (event.xexpose.count == 0) {
GLUTmenu *menu;
if (__glutMappedMenu &&
(menu = __glutGetMenu(event.xexpose.window))) {
__glutPaintMenu(menu);
} else {
window = __glutGetWindow(event.xexpose.window);
if (window) {
if (window->win == event.xexpose.window) {
window->damaged = 1;
__glutPostRedisplay(window, GLUT_REDISPLAY_WORK);
} else if (window->overlay && window->overlay->win == event.xexpose.window) {
__glutPostRedisplay(window, GLUT_OVERLAY_REDISPLAY_WORK);
window->overlay->damaged = 1;
}
}
}
} else {
/* there are more exposes to read; wait to redisplay */
}
break;
case ButtonPress:
case ButtonRelease:
if (__glutMappedMenu && event.type == ButtonRelease
&& mappedMenuButton == event.xbutton.button) {
/* Menu is currently popped up and its button is
released. */
__glutFinishMenu(event.xbutton.window, event.xbutton.x, event.xbutton.y);
} else {
window = __glutGetWindow(event.xbutton.window);
if (window) {
GLUTmenu *menu;
menu = __glutGetMenuByNum(
window->menu[event.xbutton.button - 1]);
if (menu) {
if (event.type == ButtonPress && !__glutMappedMenu) {
__glutStartMenu(menu, window,
event.xbutton.x_root, event.xbutton.y_root,
event.xbutton.x, event.xbutton.y);
mappedMenuButton = event.xbutton.button;
} else {
/* Ignore a release of a button with a menu
attatched to it when no menu is popped up, or
ignore a press when another menu is already
popped up. */
}
} else if (window->mouse) {
__glutSetWindow(window);
__glutModifierMask = event.xbutton.state;
window->mouse(event.xbutton.button - 1,
event.type == ButtonRelease ?
GLUT_UP : GLUT_DOWN,
event.xbutton.x, event.xbutton.y);
__glutModifierMask = ~0;
} else {
/* Stray mouse events. Ignore. */
}
} else {
/* Window might have been destroyed and all the
events for the window may not yet be received. */
}
}
break;
case MotionNotify:
if (!__glutMappedMenu) {
window = __glutGetWindow(event.xmotion.window);
if (window) {
/* If motion function registered _and_ buttons held *
down, call motion function... */
if (window->motion && event.xmotion.state &
(Button1Mask | Button2Mask | Button3Mask)) {
__glutSetWindow(window);
window->motion(event.xmotion.x, event.xmotion.y);
}
/* If passive motion function registered _and_
buttons not held down, call passive motion
function... */
else if (window->passive &&
((event.xmotion.state &
(Button1Mask | Button2Mask | Button3Mask)) ==
0)) {
__glutSetWindow(window);
window->passive(event.xmotion.x,
event.xmotion.y);
}
}
} else {
/* Motion events are thrown away when a pop up menu is
active. */
}
break;
case KeyPress:
window = __glutGetWindow(event.xkey.window);
if (!window) {
break;
}
if (window->keyboard) {
char tmp[1];
int rc;
rc = XLookupString(&event.xkey, tmp, sizeof(tmp),
NULL, NULL);
if (rc) {
__glutSetWindow(window);
__glutModifierMask = event.xkey.state;
window->keyboard(tmp[0],
event.xkey.x, event.xkey.y);
__glutModifierMask = ~0;
break;
}
}
if (window->special) {
KeySym ks;
int key;
ks = XLookupKeysym((XKeyEvent *) & event, 0);
/* XXX Verbose, but makes no assumptions about keysym
layout. */
switch (ks) {
/* function keys */
case XK_F1: key = GLUT_KEY_F1; break;
case XK_F2: key = GLUT_KEY_F2; break;
case XK_F3: key = GLUT_KEY_F3; break;
case XK_F4: key = GLUT_KEY_F4; break;
case XK_F5: key = GLUT_KEY_F5; break;
case XK_F6: key = GLUT_KEY_F6; break;
case XK_F7: key = GLUT_KEY_F7; break;
case XK_F8: key = GLUT_KEY_F8; break;
case XK_F9: key = GLUT_KEY_F9; break;
case XK_F10: key = GLUT_KEY_F10; break;
case XK_F11: key = GLUT_KEY_F11; break;
case XK_F12: key = GLUT_KEY_F12; break;
/* directional keys */
case XK_Left: key = GLUT_KEY_LEFT; break;
case XK_Up: key = GLUT_KEY_UP; break;
case XK_Right: key = GLUT_KEY_RIGHT; break;
case XK_Down: key = GLUT_KEY_DOWN; break;
case XK_Prior:
/* XK_Prior same as X11R6's XK_Page_Up */
key = GLUT_KEY_PAGE_UP;
break;
case XK_Next:
/* XK_Next same as X11R6's XK_Page_Down */
key = GLUT_KEY_PAGE_DOWN;
break;
case XK_Home:
key = GLUT_KEY_HOME;
break;
case XK_End:
#ifdef __hpux
case XK_Select:
#endif
key = GLUT_KEY_END;
break;
case XK_Insert:
#ifdef __hpux
case XK_InsertChar:
#endif
key = GLUT_KEY_INSERT;
break;
#ifdef __hpux
case XK_DeleteChar:
/* The Delete character is really an ASCII key. */
__glutSetWindow(window);
window->keyboard(127, /* ASCII Delete character. */
event.xkey.x, event.xkey.y);
goto skip;
#endif
default:
goto skip;
}
__glutSetWindow(window);
__glutModifierMask = event.xkey.state;
window->special(key, event.xkey.x, event.xkey.y);
__glutModifierMask = ~0;
skip:;
}
break;
case EnterNotify:
case LeaveNotify:
if (event.xcrossing.mode != NotifyNormal ||
event.xcrossing.detail == NotifyNonlinearVirtual ||
event.xcrossing.detail == NotifyVirtual) {
/* Careful to ignore Enter/LeaveNotify events that come
from the pop-up menu pointer grab and ungrab. Also,
ignore "virtual" Enter/LeaveNotify events since they
represent the pointer passing through the window
hierarchy without actually entering or leaving the
actual real estate of a window. */
break;
}
if (__glutMappedMenu) {
GLUTmenuItem *item;
int num;
item = __glutGetMenuItem(__glutMappedMenu,
event.xcrossing.window, &num);
if (item) {
__glutMenuItemEnterOrLeave(item, num, event.type);
break;
}
}
window = __glutGetWindow(event.xcrossing.window);
if (window) {
if (window->entry) {
if (event.type == EnterNotify) {
/* With overlays established, X can report two
enter events for both the overlay and normal
plane window. Do not generate a second enter
callback if we reported one without an
intervening leave. */
if (window->entryState != EnterNotify) {
int num = window->num;
Window xid = window->win;
window->entryState = EnterNotify;
__glutSetWindow(window);
window->entry(GLUT_ENTERED);
if (__glutMappedMenu) {
/* Do not generate any passive motion events
when menus are in use. */
} else {
/* An EnterNotify event can result in a
"compound" callback if a passive motion
callback is also registered. In this case,
be a little paranoid about the possibility
the window could have been destroyed in the
entry callback. */
window = __glutWindowList[num];
if (window && window->passive && window->win == xid) {
__glutSetWindow(window);
window->passive(event.xcrossing.x, event.xcrossing.y);
}
}
}
} else {
if (window->entryState != LeaveNotify) {
/* When an overlay is established for a window
already mapped and with the pointer in it, the
X server will generate a leave/enter event pair
as the pointer leaves (without moving) from the
normal plane X window to the newly mapped
overlay X window (or vice versa). This
enter/leave pair should not be reported to the
GLUT program since the pair is a consequence of
creating (or destroying) the overlay, not an
actual leave from the GLUT window. */
if (XEventsQueued(__glutDisplay, QueuedAfterReading)) {
XPeekEvent(__glutDisplay, &ahead);
if (ahead.type == EnterNotify &&
__glutGetWindow(ahead.xcrossing.window) == window) {
XNextEvent(__glutDisplay, &event);
break;
}
}
window->entryState = LeaveNotify;
__glutSetWindow(window);
window->entry(GLUT_LEFT);
}
}
} else if (window->passive) {
__glutSetWindow(window);
window->passive(event.xcrossing.x, event.xcrossing.y);
}
}
break;
case UnmapNotify:
/* MapNotify events are not needed to maintain visibility
state since VisibilityNotify events will be delivered
when a window becomes visible from mapping. However,
VisibilityNotify events are not delivered when a window
is unmapped (for the window or its children). */
window = __glutGetWindow(event.xunmap.window);
if (window) {
if (window->win != event.xconfigure.window) {
/* Ignore UnmapNotify sent to the overlay planes.
GLUT could get here because overlays select for
StructureNotify events to receive DestroyNotify. */
break;
}
updateWindowVisibility(window, 0);
}
break;
case VisibilityNotify:
window = __glutGetWindow(event.xvisibility.window);
if (window) {
int visState = (event.xvisibility.state != VisibilityFullyObscured);
if (visState != window->visState) {
if (window->visibility) {
window->visState = visState;
__glutSetWindow(window);
window->visibility(visState ? GLUT_VISIBLE : GLUT_NOT_VISIBLE);
}
}
}
break;
case ClientMessage:
if (event.xclient.data.l[0] == __glutWMDeleteWindow)
exit(0);
break;
case DestroyNotify:
purgeStaleWindow(event.xdestroywindow.window);
break;
case CirculateNotify:
case CreateNotify:
case GravityNotify:
case ReparentNotify:
/* Uninteresting to GLUT (but possible for GLUT to
receive). */
break;
default:
/* Pass events not directly handled by the GLUT main
event loop to any event parsers that have been
registered. In this way, X Input extension events are
passed to the correct handler without forcing all GLUT
programs to support X Input event handling. */
parser = eventParserList;
while (parser) {
if (parser->func(&event))
break;
parser = parser->next;
}
break;
}
}
while (XPending(__glutDisplay));
}
static void
waitForSomething(void)
{
#ifdef __vms
static struct timeval zerotime = {0};
unsigned int timer_efn;
#define timer_id 'glut' /* random :-) number */
unsigned int wait_mask;
#else
static struct timeval zerotime = {0, 0};
fd_set fds;
#endif
struct timeval now, timeout, waittime;
int rc;
/* flush X protocol since XPending does not do this
implicitly */
XFlush(__glutDisplay);
if (XPending(__glutDisplay)) {
/* It is possible (but quite rare) that XFlush may have
needed to wait for a writable X connection file
descriptor, and in the process, may have had to read off
X protocol from the file descriptor. If XPending is true,
this case occured and we should avoid waiting in select
since X protocol buffered within Xlib is due to be
processed and potentially no more X protocol is on the
file descriptor, so we would risk waiting improperly in
select. */
goto immediatelyHandleXinput;
}
#ifdef __vms
timeout = __glutTimerList->timeout;
GETTIMEOFDAY(&now);
wait_mask = 1 << (__glutConnectionFD & 31);
if (IS_AFTER(now, timeout)) {
/* We need an event flag for the timer. */
/* XXX The `right' way to do this is to use LIB$GET_EF, but since it needs
to be in the same cluster as the EFN for the display, we will have
hack it. */
timer_efn = __glutConnectionFD - 1;
if ((timer_efn / 32) != (__glutConnectionFD / 32) ) {
timer_efn = __glutConnectionFD + 1;
}
rc = SYS$CLREF (timer_efn);
rc = SYS$SETIMR (timer_efn, &timeout, NULL, timer_id, 0);
wait_mask |= 1 << (timer_efn & 31);
} else {
timer_efn = 0;
}
rc = SYS$WFLOR (__glutConnectionFD, wait_mask);
if (timer_efn != 0 && SYS$CLREF (timer_efn) == SS$_WASCLR) {
rc = SYS$CANTIM (timer_id, PSL$C_USER);
}
/* XXX There does not seem to be checking of "rc" in the code
above. Can any of the SYS$ routines above fail? */
#else /* not vms */
FD_ZERO(&fds);
FD_SET(__glutConnectionFD, &fds);
timeout = __glutTimerList->timeout;
GETTIMEOFDAY(&now);
if (IS_AFTER(now, timeout)) {
TIMEDELTA(waittime, timeout, now);
} else {
waittime = zerotime;
}
rc = select(__glutConnectionFD + 1, &fds,
NULL, NULL, &waittime);
if (rc < 0 && errno != EINTR)
__glutFatalError("select error.");
#endif /* not vms */
/* Without considering the cause of select unblocking, check
for pending X events *and* then handle any timeouts. We
always look for X events even if select returned with 0
(indicating a timeout); otherwise we risk starving X event
processing by continous timeouts. */
while (XPending(__glutDisplay)) {
immediatelyHandleXinput:
processEvents();
}
handleTimeouts();
}
static void
idleWait(void)
{
while (XPending(__glutDisplay)) {
processEvents();
}
if (__glutTimerList)
handleTimeouts();
/* Make sure idle func still exists! */
if (__glutIdleFunc)
__glutIdleFunc();
}
static GLUTwindow **beforeEnd;
static GLUTwindow *
processWindowWorkList(GLUTwindow * window)
{
int workMask;
if (window->prevWorkWin)
window->prevWorkWin = processWindowWorkList(window->prevWorkWin);
else
beforeEnd = &window->prevWorkWin;
/* Capture work mask for work that needs to be done to this
window, then clear the window's work mask (excepting the
dummy work bit, see below). Then, process the captured
work mask. This allows callbacks in the processing the
captured work mask to set the window's work mask for
subsequent processing. */
workMask = window->workMask;
assert((workMask & GLUT_DUMMY_WORK) == 0);
/* Set the dummy work bit, clearing all other bits, to
indicate that the window is currently on the window work
list _and_ that the window's work mask is currently being
processed. This convinces __glutPutOnWorkList that this
window is on the work list still. */
window->workMask = GLUT_DUMMY_WORK;
/* Optimization: most of the time, the work to do is a
redisplay and not these other types of work. Check for
the following cases as a group to before checking each one
individually one by one. This saves about 25 MIPS
instructions in the common redisplay only case. */
if (workMask & (GLUT_EVENT_MASK_WORK | GLUT_DEVICE_MASK_WORK |
GLUT_CONFIGURE_WORK | GLUT_COLORMAP_WORK | GLUT_MAP_WORK)) {
/* Be sure to set event mask *BEFORE* map window is done. */
if (workMask & GLUT_EVENT_MASK_WORK) {
long eventMask;
/* Make sure children are not propogating events this
window is selecting for. Be sure to do this before
enabling events on the children's parent. */
if (window->children) {
GLUTwindow *child = window->children;
unsigned long attribMask = CWDontPropagate;
XSetWindowAttributes wa;
wa.do_not_propagate_mask = window->eventMask & GLUT_DONT_PROPAGATE_FILTER_MASK;
if (window->eventMask & GLUT_HACK_STOP_PROPAGATE_MASK) {
wa.event_mask = child->eventMask | (window->eventMask & GLUT_HACK_STOP_PROPAGATE_MASK);
attribMask |= CWEventMask;
}
do {
XChangeWindowAttributes(__glutDisplay, child->win,
attribMask, &wa);
child = child->siblings;
} while (child);
}
eventMask = window->eventMask;
if (window->parent && window->parent->eventMask & GLUT_HACK_STOP_PROPAGATE_MASK)
eventMask |= (window->parent->eventMask & GLUT_HACK_STOP_PROPAGATE_MASK);
XSelectInput(__glutDisplay, window->win, eventMask);
if (window->overlay)
XSelectInput(__glutDisplay, window->overlay->win,
window->eventMask & GLUT_OVERLAY_EVENT_FILTER_MASK);
}
/* Be sure to set device mask *BEFORE* map window is done. */
if (workMask & GLUT_DEVICE_MASK_WORK) {
__glutUpdateInputDeviceMaskFunc(window);
}
/* Be sure to configure window *BEFORE* map window is done.
*/
if (workMask & GLUT_CONFIGURE_WORK) {
XWindowChanges changes;
changes.x = window->desiredX;
changes.y = window->desiredY;
if (window->desiredConfMask & (CWWidth | CWHeight)) {
changes.width = window->desiredWidth;
changes.height = window->desiredHeight;
if (window->overlay)
XResizeWindow(__glutDisplay, window->overlay->win,
window->desiredWidth, window->desiredHeight);
if (__glutMotifHints != None) {
if (workMask & GLUT_FULL_SCREEN_WORK) {
MotifWmHints hints;
hints.flags = MWM_HINTS_DECORATIONS;
hints.decorations = 0; /* Absolutely no
decorations. */
XChangeProperty(__glutDisplay, window->win,
__glutMotifHints, __glutMotifHints, 32,
PropModeReplace, (unsigned char *) &hints, 4);
} else {
XDeleteProperty(__glutDisplay, window->win, __glutMotifHints);
}
}
}
if (window->desiredConfMask & CWStackMode) {
changes.stack_mode = window->desiredStack;
/* Do not let glutPushWindow push window beneath the
underlay. */
if (window->parent && window->parent->overlay && window->desiredStack == Below) {
changes.stack_mode = Above;
changes.sibling = window->parent->overlay->win;
window->desiredConfMask |= CWSibling;
}
}
XConfigureWindow(__glutDisplay, window->win,
window->desiredConfMask, &changes);
window->desiredConfMask = 0;
}
/* Be sure to establish the colormaps *BEFORE* map window
is done. */
if (workMask & GLUT_COLORMAP_WORK) {
__glutEstablishColormapsProperty(window);
}
if (workMask & GLUT_MAP_WORK) {
switch (window->desiredMapState) {
case WithdrawnState:
if (window->parent) {
XUnmapWindow(__glutDisplay, window->win);
} else {
XWithdrawWindow(__glutDisplay, window->win,
__glutScreen);
}
window->shownState = 0;
break;
case NormalState:
XMapWindow(__glutDisplay, window->win);
window->shownState = 1;
break;
case IconicState:
XIconifyWindow(__glutDisplay, window->win, __glutScreen);
window->shownState = 0;
break;
}
}
}
if (workMask & (GLUT_REDISPLAY_WORK | GLUT_OVERLAY_REDISPLAY_WORK)) {
if (window->forceReshape) {
/* Guarantee that before a display callback is generated
for a window, a reshape callback must be generated. */
__glutSetWindow(window);
window->reshape(window->width, window->height);
window->forceReshape = False;
}
/* The code below is more involved than otherwise necessary
because it is paranoid about the overlay or entire window
being removed or destroyed in the course of the callbacks.
Notice how the global __glutWindowDamaged is used to
record the layers' damage status. See the code in
glutLayerGet for how __glutWindowDamaged is used. The
point is to not have to update the "damaged" field after
the callback since the window (or overlay) may be
destroyed (or removed) when the callback returns. */
if (window->overlay && window->overlay->display) {
int num = window->num;
Window xid = window->overlay ? window->overlay->win : None;
/* If an overlay display callback is registered, we
differentiate between a redisplay needed for the
overlay and/or normal plane. If there is no overlay
display callback registered, we simply use the
standard display callback. */
if (workMask & GLUT_REDISPLAY_WORK) {
/* Render to normal plane. */
window->renderWin = window->win;
window->renderCtx = window->ctx;
__glutWindowDamaged = window->damaged;
window->damaged = 0;
__glutSetWindow(window);
window->display();
__glutWindowDamaged = 0;
}
if (workMask & GLUT_OVERLAY_REDISPLAY_WORK) {
window = __glutWindowList[num];
if (window && window->overlay &&
window->overlay->win == xid && window->overlay->display) {
/* Render to overlay. */
window->renderWin = window->overlay->win;
window->renderCtx = window->overlay->ctx;
__glutWindowDamaged = window->overlay->damaged;
window->overlay->damaged = 0;
__glutSetWindow(window);
window->overlay->display();
__glutWindowDamaged = 0;
} else {
/* Overlay may have since been destroyed or the
overlay callback may have been disabled during
normal display callback. */
}
}
} else {
__glutWindowDamaged = window->damaged;
window->damaged = 0;
if (window->overlay) {
__glutWindowDamaged |= window->overlay->damaged;
window->overlay->damaged = 0;
}
__glutSetWindow(window);
window->display();
__glutWindowDamaged = 0;
}
}
/* Combine workMask with window->workMask to determine what
finish and debug work there is. */
workMask |= window->workMask;
if (workMask & GLUT_FINISH_WORK) {
__glutSetWindow(window);
glFinish();
}
if (workMask & GLUT_DEBUG_WORK) {
GLenum error;
__glutSetWindow(window);
while ((error = glGetError()) != GL_NO_ERROR)
__glutWarning("GL error: %s", gluErrorString(error));
}
/* Strip out dummy, finish, and debug work bits. */
window->workMask &= ~(GLUT_DUMMY_WORK | GLUT_FINISH_WORK | GLUT_DEBUG_WORK);
if (window->workMask) {
/* Leave on work list. */
return window;
} else {
/* Remove current window from work list. */
return window->prevWorkWin;
}
}
void
glutMainLoop(void)
{
if (!__glutDisplay)
__glutFatalUsage("main loop entered with out X connection.");
if (!__glutWindowListSize)
__glutFatalUsage(
"main loop entered with no windows created.");
for (;;) {
if (__glutWindowWorkList) {
GLUTwindow *remainder, *work;
work = __glutWindowWorkList;
__glutWindowWorkList = NULL;
if (work) {
remainder = processWindowWorkList(work);
if (remainder) {
*beforeEnd = __glutWindowWorkList;
__glutWindowWorkList = remainder;
}
}
}
if (__glutIdleFunc || __glutWindowWorkList) {
idleWait();
} else {
if (__glutTimerList) {
waitForSomething();
} else {
processEvents();
}
}
}
}
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