/* CENTRY */
void APIENTRY
glutMainLoop(void)
{
#if !defined(_WIN32)
if (!__glutDisplay)
__glutFatalUsage("main loop entered with out proper initialization.");
#endif
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 {
processEventsAndTimeouts();
}
}
}
}
static /* X11 implementations do not need this global. */
void
__glutProcessWindowWorkLists(void)
{
if (__glutWindowWorkList) {
GLUTwindow *remainder, *work;
work = __glutWindowWorkList;
__glutWindowWorkList = NULL;
if (work) {
remainder = processWindowWorkList(work);
if (remainder) {
*beforeEnd = __glutWindowWorkList;
__glutWindowWorkList = remainder;
}
}
}
}
/* CENTRY */
void APIENTRY
glutMainLoop(void)
{
#if !defined(_WIN32)
if (!__glutDisplay)
__glutFatalUsage("main loop entered with out proper initialization.");
#endif
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 {
processEventsAndTimeouts();
}
#if defined(_WIN32)
// If there is no idle function, go to sleep for a millisecond (we
// still need to possibly service timers) or until there is some
// event in our queue.
MsgWaitForMultipleObjects(0, NULL, FALSE, 1, QS_ALLEVENTS);
#endif
}
}
}
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)) {
#if !defined(_WIN32)
/* 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);
}
#endif /* !_WIN32 */
/* 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) {
#if defined(_WIN32)
RECT changes;
POINT point;
UINT flags = SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOOWNERZORDER
| SWP_NOSENDCHANGING | SWP_NOSIZE | SWP_NOZORDER;
GetClientRect(window->win, &changes);
/* If this window is a toplevel window, translate the 0,0 client
coordinate into a screen coordinate for proper placement. */
if (!window->parent) {
point.x = 0;
point.y = 0;
ClientToScreen(window->win, &point);
changes.left = point.x;
changes.top = point.y;
}
if (window->desiredConfMask & (CWX | CWY)) {
changes.left = window->desiredX;
changes.top = window->desiredY;
flags &= ~SWP_NOMOVE;
}
if (window->desiredConfMask & (CWWidth | CWHeight)) {
changes.right = changes.left + window->desiredWidth;
changes.bottom = changes.top + window->desiredHeight;
flags &= ~SWP_NOSIZE;
/* XXX If overlay exists, resize the overlay here, ie.
if (window->overlay) ... */
}
if (window->desiredConfMask & CWStackMode) {
flags &= ~SWP_NOZORDER;
/* XXX Overlay support might require something special here. */
}
/* Adjust the window rectangle because Win32 thinks that the x, y,
width & height are the WHOLE window (including decorations),
whereas GLUT treats the x, y, width & height as only the CLIENT
area of the window. Only do this to top level windows
that are not in game mode (since game mode windows do
not have any decorations). */
if (!window->parent && window != __glutGameModeWindow) {
AdjustWindowRect(&changes,
WS_OVERLAPPEDWINDOW | WS_CLIPSIBLINGS | WS_CLIPCHILDREN,
FALSE);
}
/* Do the repositioning, moving, and push/pop. */
SetWindowPos(window->win,
window->desiredStack == Above ? HWND_TOP : HWND_NOTOPMOST,
changes.left, changes.top,
changes.right - changes.left, changes.bottom - changes.top,
flags);
/* Zero out the mask. */
window->desiredConfMask = 0;
/* This hack causes the window to go back to the right position
when it is taken out of fullscreen mode. */
if (workMask & GLUT_FULL_SCREEN_WORK) {
window->desiredConfMask |= CWX | CWY;
window->desiredX = point.x;
window->desiredY = point.y;
}
#else /* !_WIN32 */
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);
if (workMask & GLUT_MAP_WORK) {
/* Handle case where glutFullScreen is called
before the first time that the window is
mapped. Some window managers will randomly or
interactively position the window the first
time it is mapped if the window's
WM_NORMAL_HINTS property does not request an
explicit position. We don't want any such
window manager interaction when going
fullscreen. Overwrite the WM_NORMAL_HINTS
property installed by glutCreateWindow's
XSetWMProperties property with one explicitly
requesting a fullscreen window. */
XSizeHints hints;
hints.flags = USPosition | USSize;
hints.x = 0;
hints.y = 0;
hints.width = window->desiredWidth;
hints.height = window->desiredHeight;
XSetWMNormalHints(__glutDisplay, window->win, &hints);
}
} 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;
#endif
}
#if !defined(_WIN32)
/* Be sure to establish the colormaps BEFORE map window is
done. */
if (workMask & GLUT_COLORMAP_WORK) {
__glutEstablishColormapsProperty(window);
}
#endif
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;
#ifdef _WIN32
case GameModeState: /* Not an Xlib value. */
ShowWindow(window->win, SW_SHOW);
window->shownState = 1;
break;
#endif
case IconicState:
XIconifyWindow(__glutDisplay, window->win, __glutScreen);
window->shownState = 0;
break;
}
}
}
if (workMask & (GLUT_REDISPLAY_WORK | GLUT_OVERLAY_REDISPLAY_WORK | GLUT_REPAIR_WORK | GLUT_OVERLAY_REPAIR_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;
/* Setting the redisplay bit on the first reshape is
necessary to make the "Mesa glXSwapBuffers to repair
damage" hack operate correctly. Without indicating a
redisplay is necessary, there's not an initial back
buffer render from which to blit from when damage
happens to the window. */
workMask |= GLUT_REDISPLAY_WORK;
}
/* 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 | GLUT_REPAIR_WORK)) {
if (__glutMesaSwapHackSupport) {
if (window->usedSwapBuffers) {
if ((workMask & (GLUT_REPAIR_WORK | GLUT_REDISPLAY_WORK)) == GLUT_REPAIR_WORK) {
SWAP_BUFFERS_WINDOW(window);
goto skippedDisplayCallback1;
}
}
}
/* Render to normal plane. */
#ifdef _WIN32
window->renderDc = window->hdc;
#endif
window->renderWin = window->win;
window->renderCtx = window->ctx;
__glutWindowDamaged = (workMask & GLUT_REPAIR_WORK);
__glutSetWindow(window);
window->usedSwapBuffers = 0;
window->display();
__glutWindowDamaged = 0;
skippedDisplayCallback1:;
}
if (workMask & (GLUT_OVERLAY_REDISPLAY_WORK | GLUT_OVERLAY_REPAIR_WORK)) {
window = __glutWindowList[num];
if (window && window->overlay &&
window->overlay->win == xid && window->overlay->display) {
/* Render to overlay. */
#ifdef _WIN32
window->renderDc = window->overlay->hdc;
#endif
window->renderWin = window->overlay->win;
window->renderCtx = window->overlay->ctx;
__glutWindowDamaged = (workMask & GLUT_OVERLAY_REPAIR_WORK);
__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 {
if (__glutMesaSwapHackSupport) {
if (!window->overlay && window->usedSwapBuffers) {
if ((workMask & (GLUT_REPAIR_WORK | GLUT_REDISPLAY_WORK)) == GLUT_REPAIR_WORK) {
SWAP_BUFFERS_WINDOW(window);
goto skippedDisplayCallback2;
}
}
}
/* Render to normal plane (and possibly overlay). */
__glutWindowDamaged = (workMask & (GLUT_OVERLAY_REPAIR_WORK | GLUT_REPAIR_WORK));
__glutSetWindow(window);
window->usedSwapBuffers = 0;
window->display();
__glutWindowDamaged = 0;
skippedDisplayCallback2:;
}
}
/* Combine workMask with window->workMask to determine what
finish and debug work there is. */
workMask |= window->workMask;
if (workMask & GLUT_FINISH_WORK) {
/* Finish work makes sure a glFinish gets done to indirect
rendering contexts. Indirect contexts tend to have much
longer latency because lots of OpenGL extension requests
can queue up in the X protocol stream. __glutSetWindow
is where the finish works gets queued for indirect
contexts. */
__glutSetWindow(window);
#if !defined(_WIN32)
if (!window->isDirect)
#endif
{
glFinish();
}
}
if (workMask & GLUT_DEBUG_WORK) {
__glutSetWindow(window);
glutReportErrors();
}
/* 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;
}
}
