glutevent.cpp

mesa-6.5-minigui源码

/***********************************************************
 *      Copyright (C) 1997, Be Inc.  Copyright (C) 1999, Jake Hamby.
 *
 * 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.
 *
 *
 *  FILE:	glutEvent.cpp
 *
 *	DESCRIPTION:	here it is, the BeOS GLUT event loop
 ***********************************************************/

/***********************************************************
 *	Headers
 ***********************************************************/
#include <GL/glut.h>
#include "glutint.h"
#include "glutState.h"
#include "glutBlocker.h"

/***********************************************************
 *	CLASS:	GLUTtimer
 *
 *	DESCRIPTION:	list of timer callbacks
 ***********************************************************/
struct GLUTtimer {
	GLUTtimer *next;	// list of timers
	bigtime_t timeout;	// time to be called
	GLUTtimerCB func;	// function to call
	int value;			// value
};

/***********************************************************
 *	Private variables
 ***********************************************************/
static GLUTtimer *__glutTimerList = 0;			// list of timer callbacks
static GLUTtimer *freeTimerList = 0;

/***********************************************************
 *	FUNCTION:	glutTimerFunc (7.19)
 *
 *	DESCRIPTION:  register a new timer callback
 ***********************************************************/
void APIENTRY 
glutTimerFunc(unsigned int interval, GLUTtimerCB timerFunc, int value)
{
  GLUTtimer *timer, *other;
  GLUTtimer **prevptr;

  if (!timerFunc)
    return;

  if (freeTimerList) {
    timer = freeTimerList;
    freeTimerList = timer->next;
  } else {
    timer = new GLUTtimer();
    if (!timer)
      __glutFatalError("out of memory.");
  }

  timer->func = timerFunc;
  timer->value = value;
  timer->next = NULL;
  timer->timeout = system_time() + (interval*1000);	// 1000 ticks in a millisecond
  prevptr = &__glutTimerList;
  other = *prevptr;
  while (other && (other->timeout < timer->timeout)) {
    prevptr = &other->next;
    other = *prevptr;
  }
  timer->next = other;
  *prevptr = timer;
}

/***********************************************************
 *	FUNCTION:	handleTimeouts
 *
 *	DESCRIPTION:  private function to handle outstanding timeouts
 ***********************************************************/
static void
handleTimeouts(void)
{
  bigtime_t now;
  GLUTtimer *timer;

  /* Assumption is that __glutTimerList is already determined
     to be non-NULL. */
  now = system_time();
  while (__glutTimerList->timeout <= now) {
    timer = __glutTimerList;
    if(gState.currentWindow)
	    gState.currentWindow->LockGL();
    timer->func(timer->value);
    if(gState.currentWindow)
	    gState.currentWindow->UnlockGL();
    __glutTimerList = timer->next;
    timer->next = freeTimerList;
    freeTimerList = timer;
    if (!__glutTimerList)
      break;
  }
}


/***********************************************************
 *	FUNCTION:	processEventsAndTimeouts
 *
 *	DESCRIPTION:  clear gBlock, then check all windows for events
 ***********************************************************/
static void
processEventsAndTimeouts(void)
{
	gBlock.WaitEvent();		// if there is already an event, returns
							// immediately, otherwise wait forever
	gBlock.ClearEvents();
	
	if(gState.quitAll)
		exit(0);		// exit handler cleans up windows and quits nicely
	
	if (gState.currentWindow)
		gState.currentWindow->LockGL();
	for(int i=0; i<gState.windowListSize; i++) {
		if (gState.windowList[i]) {
			GlutWindow *win = gState.windowList[i];
			// NOTE: we can use win as a shortcut for gState.windowList[i]
			// in callbacks, EXCEPT we need to check the original variable
			// after each callback to make sure the window hasn't been destroyed
			if (win->anyevents) {
				win->anyevents = false;
				if (win->reshapeEvent) {
					win->reshapeEvent = false;
					__glutSetWindow(win);
					win->reshape(win->m_width, win->m_height);
				}
				if (!gState.windowList[i])
					continue;	// window was destroyed by callback!

				if (win->displayEvent) {
					win->displayEvent = false;
					__glutSetWindow(win);
					win->display();
				}
				if (!gState.windowList[i])
					continue;	// window was destroyed by callback!

				if (win->mouseEvent) {
					win->mouseEvent = false;
					__glutSetWindow(win);
					if (win->mouse) {
						gState.modifierKeys = win->modifierKeys;
						win->mouse(win->button, win->mouseState, win->mouseX, win->mouseY);
						gState.modifierKeys = ~0;
					}
				}
				if (!gState.windowList[i])
					continue;	// window was destroyed by callback!

				if (win->menuEvent) {
					win->menuEvent = false;
					__glutSetWindow(win);
					GlutMenu *menu = __glutGetMenuByNum(win->menuNumber);
					if (menu) {
						gState.currentMenu = menu;
						menu->select(win->menuValue);
					}
				}
				if (!gState.windowList[i])
					continue;	// window was destroyed by callback!

				if (win->statusEvent) {
					win->statusEvent = false;
					__glutSetWindow(win);
					if (gState.menuStatus) {
						gState.currentMenu = __glutGetMenuByNum(win->menuNumber);
						gState.menuStatus(win->menuStatus, win->statusX, win->statusY);
					}
				}
				if (!gState.windowList[i])
					continue;	// window was destroyed by callback!

				if (win->motionEvent) {
					win->motionEvent = false;
					__glutSetWindow(win);
					if (win->motion)
						win->motion(win->motionX, win->motionY);
				}
				if (!gState.windowList[i])
					continue;	// window was destroyed by callback!

				if (win->passiveEvent) {
					win->passiveEvent = false;
					__glutSetWindow(win);
					if (win->passive)
						win->passive(win->passiveX, win->passiveY);
				}
				if (!gState.windowList[i])
					continue;	// window was destroyed by callback!

				if (win->keybEvent) {
					win->keybEvent = false;
					__glutSetWindow(win);
					if (win->keyboard) {
						gState.modifierKeys = win->modifierKeys;
						win->keyboard(win->key, win->keyX, win->keyY);
						gState.modifierKeys = ~0;
					}
				}
				if (!gState.windowList[i])
					continue;	// window was destroyed by callback!

				if (win->specialEvent) {
					win->specialEvent = false;
					__glutSetWindow(win);
					if (win->special) {
						gState.modifierKeys = win->modifierKeys;
						win->special(win->specialKey, win->specialX, win->specialY);
						gState.modifierKeys = ~0;
					}
				}
				if (!gState.windowList[i])
					continue;	// window was destroyed by callback!

				if (win->entryEvent) {
					win->entryEvent = false;
					__glutSetWindow(win);
					if (win->entry)
						win->entry(win->entryState);
				}
				if (!gState.windowList[i])
					continue;	// window was destroyed by callback!

				if (win->windowStatusEvent) {
					win->windowStatusEvent = false;
					__glutSetWindow(win);
					if (win->windowStatus)
						win->windowStatus(win->visState);
				}
				if (!gState.windowList[i])
					continue;	// window was destroyed by callback!
			}
		}
	}
	if (gState.currentWindow)
		gState.currentWindow->UnlockGL();

	// This code isn't necessary since BGLView automatically traps errors
#if 0
	if(gState.debug) {
		for(int i=0; i<gState.windowListSize; i++) {
			if (gState.windowList[i]) {
				gState.windowList[i]->LockGL();
				glutReportErrors();
				gState.windowList[i]->UnlockGL();
			}
		}
	}
#endif
	if (__glutTimerList) {
      handleTimeouts();
    }
}

/***********************************************************
 *	FUNCTION:	waitForSomething
 *
 *	DESCRIPTION:  use gBlock to wait for a new event or timeout
 ***********************************************************/
static void
waitForSomething(void)
{
	bigtime_t timeout = __glutTimerList->timeout;
	bigtime_t now = system_time();
	
	if (gBlock.PendingEvent())
		goto immediatelyHandleEvent;
	
	if(timeout>now)
		gBlock.WaitEvent(timeout-now);
	if (gBlock.PendingEvent()) {
	immediatelyHandleEvent:
		processEventsAndTimeouts();
	} else {
		if (__glutTimerList)
			handleTimeouts();
	}
}

/***********************************************************
 *	FUNCTION:	idleWait
 *
 *	DESCRIPTION:  check for events, then call idle function
 ***********************************************************/
static void
idleWait(void)
{
  if (gBlock.PendingEvent()) {
    processEventsAndTimeouts();
  } else {
    if (__glutTimerList)
      handleTimeouts();
  }
  /* Make sure idle func still exists! */
  if(gState.currentWindow)
	  gState.currentWindow->LockGL();
  if (gState.idle) {
    gState.idle();
  }
  if(gState.currentWindow)
	  gState.currentWindow->UnlockGL();
}

/***********************************************************
 *	FUNCTION:	glutMainLoop (3.1)
 *
 *	DESCRIPTION:  enter the event processing loop
 ***********************************************************/
void glutMainLoop()
{
  if (!gState.windowListSize)
    __glutFatalUsage("main loop entered with no windows created.");

  if(gState.currentWindow)
	  gState.currentWindow->UnlockGL();

  for (;;) {
    if (gState.idle) {
      idleWait();
    } else {
      if (__glutTimerList) {
        waitForSomething();
      } else {
        processEventsAndTimeouts();
      }
    }
  }
}

/***********************************************************
 *	CLASS:		GlutWindow
 *
 *	FUNCTION:	KeyDown
 *
 *	DESCRIPTION:  handles keyboard and special events
 ***********************************************************/
void GlutWindow::KeyDown(const char *s, int32 slen)
{