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This commit is contained in:
David Rose 2001-04-13 17:00:47 +00:00
parent a5bfa23fb7
commit 5271fd522d
3 changed files with 60 additions and 20 deletions
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69
panda/src/express/clockObject.I
View File

@ -5,7 +5,7 @@
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::Destructor // Function: ClockObject::Destructor
// Access: Public // Access: Published
// Description: // Description:
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
INLINE ClockObject:: INLINE ClockObject::
@ -14,7 +14,7 @@ INLINE ClockObject::
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::set_mode // Function: ClockObject::set_mode
// Access: Public // Access: Published
// Description: Changes the mode of the clock, e.g. from normal // Description: Changes the mode of the clock, e.g. from normal
// (real-time) to non-real-time. In non-real-time mode, // (real-time) to non-real-time. In non-real-time mode,
// tick() will add the value of dt to the value returned // tick() will add the value of dt to the value returned
@ -30,7 +30,7 @@ set_mode(ClockObject::Mode mode) {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::get_mode // Function: ClockObject::get_mode
// Access: Public // Access: Published
// Description: Returns the current mode of the clock. See // Description: Returns the current mode of the clock. See
// set_mode(). // set_mode().
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
@ -41,7 +41,7 @@ get_mode() const {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::get_frame_time // Function: ClockObject::get_frame_time
// Access: Public // Access: Published
// Description: Returns the time in seconds as of the last time // Description: Returns the time in seconds as of the last time
// tick() was called (typically, this will be as of the // tick() was called (typically, this will be as of the
// start of the current frame). // start of the current frame).
@ -58,7 +58,7 @@ get_frame_time() const {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::get_intra_frame_time // Function: ClockObject::get_intra_frame_time
// Access: Public // Access: Published
// Description: Returns the number of seconds that have elapsed since // Description: Returns the number of seconds that have elapsed since
// the start of the frame. This might be useful for // the start of the frame. This might be useful for
// certain specialty applications, for instance to // certain specialty applications, for instance to
@ -76,7 +76,7 @@ get_intra_frame_time() const {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::get_real_time // Function: ClockObject::get_real_time
// Access: Public // Access: Published
// Description: Returns the actual number of seconds elapsed since // Description: Returns the actual number of seconds elapsed since
// the ClockObject was created, or since it was last // the ClockObject was created, or since it was last
// reset. This is useful for doing real timing // reset. This is useful for doing real timing
@ -89,7 +89,7 @@ get_real_time() const {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::reset // Function: ClockObject::reset
// Access: Public // Access: Published
// Description: Simultaneously resets both the time and the frame // Description: Simultaneously resets both the time and the frame
// count to zero. // count to zero.
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
@ -102,7 +102,7 @@ reset() {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::set_real_time // Function: ClockObject::set_real_time
// Access: Public // Access: Published
// Description: Resets the clock to the indicated time. This // Description: Resets the clock to the indicated time. This
// changes only the real time of the clock as reported // changes only the real time of the clock as reported
// by get_real_time(), but does not immediately change // by get_real_time(), but does not immediately change
@ -117,7 +117,7 @@ set_real_time(double time) {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::set_frame_time // Function: ClockObject::set_frame_time
// Access: Public // Access: Published
// Description: Changes the time as reported for the current frame to // Description: Changes the time as reported for the current frame to
// the indicated time. Normally, the way to adjust the // the indicated time. Normally, the way to adjust the
// frame time is via tick(); this function is provided // frame time is via tick(); this function is provided
@ -131,7 +131,7 @@ set_frame_time(double time) {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::set_frame_count // Function: ClockObject::set_frame_count
// Access: Public // Access: Published
// Description: Resets the number of frames counted to the indicated // Description: Resets the number of frames counted to the indicated
// number. Also see reset(), set_real_time(), and // number. Also see reset(), set_real_time(), and
// set_frame_time(). // set_frame_time().
@ -143,7 +143,7 @@ set_frame_count(int frame_count) {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::get_frame_count // Function: ClockObject::get_frame_count
// Access: Public // Access: Published
// Description: Returns the number of times tick() has been called // Description: Returns the number of times tick() has been called
// since the ClockObject was created, or since it was // since the ClockObject was created, or since it was
// last reset. This is generally the number of frames // last reset. This is generally the number of frames
@ -156,7 +156,7 @@ get_frame_count() const {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::get_frame_rate // Function: ClockObject::get_frame_rate
// Access: Public // Access: Published
// Description: Returns the average frame rate since the last reset. // Description: Returns the average frame rate since the last reset.
// This is simply the total number of frames divided by // This is simply the total number of frames divided by
// the total elapsed time. // the total elapsed time.
@ -168,7 +168,7 @@ get_frame_rate() const {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::get_dt // Function: ClockObject::get_dt
// Access: Public // Access: Published
// Description: Returns the elapsed time for the previous frame: the // Description: Returns the elapsed time for the previous frame: the
// number of seconds elapsed between the last two calls // number of seconds elapsed between the last two calls
// to tick(). // to tick().
@ -180,7 +180,7 @@ get_dt() const {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::set_dt // Function: ClockObject::set_dt
// Access: Public // Access: Published
// Description: In non-real-time mode, sets the number of seconds // Description: In non-real-time mode, sets the number of seconds
// that should appear to elapse between frames. // that should appear to elapse between frames.
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
@ -195,9 +195,42 @@ set_dt(double dt) {
_dt = dt; _dt = dt;
} }
////////////////////////////////////////////////////////////////////
// Function: ClockObject::get_max_dt
// Access: Published
// Description: Returns the current maximum allowable time elapsed
// between any two frames. See set_max_dt().
////////////////////////////////////////////////////////////////////
INLINE double ClockObject::
get_max_dt() const {
return _max_dt;
}
////////////////////////////////////////////////////////////////////
// Function: ClockObject::set_max_dt
// Access: Published
// Description: Sets a limit on the value returned by get_dt(). If
// this value is less than zero, no limit is imposed;
// otherwise, this is the maximum value that will ever
// be returned by get_dt(), regardless of how much time
// has actually elapsed between frames.
//
// This limit is only imposed in real-time mode; in
// non-real-time mode, the dt is fixed anyway and max_dt
// is ignored.
//
// This is generally used to guarantee reasonable
// behavior even in the presence of a very slow or
// chuggy frame rame.
////////////////////////////////////////////////////////////////////
INLINE void ClockObject::
set_max_dt(double max_dt) {
_max_dt = max_dt;
}
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::get_global_clock // Function: ClockObject::get_global_clock
// Access: Public // Access: Published
// Description: Returns a pointer to the global ClockObject. This is // Description: Returns a pointer to the global ClockObject. This is
// the ClockObject that most code should use for // the ClockObject that most code should use for
// handling scene graph rendering and animation. // handling scene graph rendering and animation.
@ -212,7 +245,7 @@ get_global_clock() {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: TimeVal::contructor // Function: TimeVal::contructor
// Access: Public // Access: Published
// Description: // Description:
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
INLINE TimeVal:: INLINE TimeVal::
@ -221,7 +254,7 @@ TimeVal(void) {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: TimeVal::get_sec // Function: TimeVal::get_sec
// Access: Public // Access: Published
// Description: // Description:
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
INLINE ulong TimeVal:: INLINE ulong TimeVal::
@ -231,7 +264,7 @@ get_sec(void) const {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: TimeVal::get_usec // Function: TimeVal::get_usec
// Access: Public // Access: Published
// Description: // Description:
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
INLINE ulong TimeVal:: INLINE ulong TimeVal::

7
panda/src/express/clockObject.cxx
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@ -10,7 +10,7 @@ ClockObject *ClockObject::_global_clock = (ClockObject *)NULL;
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::Constructor // Function: ClockObject::Constructor
// Access: Public // Access: Published
// Description: // Description:
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
ClockObject:: ClockObject::
@ -26,7 +26,7 @@ ClockObject() {
//////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////
// Function: ClockObject::tick // Function: ClockObject::tick
// Access: Public // Access: Published
// Description: Instructs the clock that a new frame has just begun. // Description: Instructs the clock that a new frame has just begun.
// In normal, real-time mode, get_frame_time() will // In normal, real-time mode, get_frame_time() will
// henceforth report the time as of this instant as the // henceforth report the time as of this instant as the
@ -42,6 +42,9 @@ tick() {
switch (_mode) { switch (_mode) {
case M_normal: case M_normal:
_dt = _actual_frame_time - old_time; _dt = _actual_frame_time - old_time;
if (_max_dt > 0.0) {
_dt = min(_max_dt, _dt);
}
_reported_frame_time = _actual_frame_time; _reported_frame_time = _actual_frame_time;
break; break;

4
panda/src/express/clockObject.h
View File

@ -78,6 +78,9 @@ PUBLISHED:
INLINE double get_dt() const; INLINE double get_dt() const;
INLINE void set_dt(double dt); INLINE void set_dt(double dt);
INLINE double get_max_dt() const;
INLINE void set_max_dt(double max_dt);
void tick(); void tick();
INLINE static ClockObject *get_global_clock(); INLINE static ClockObject *get_global_clock();
@ -90,6 +93,7 @@ private:
double _actual_frame_time; double _actual_frame_time;
double _reported_frame_time; double _reported_frame_time;
double _dt; double _dt;
double _max_dt;
static ClockObject *_global_clock; static ClockObject *_global_clock;
}; };