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src/Time/TimeManager.*: in simple-time, added support for fixed fdm increment.

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If in simple-time mode and /sim/time/fixed-dt is non-zero, we always increment
FDM time by fixed amount each frame, regardless of frame rate. Allows creation
of high quality videos even on slow hardware.
This commit is contained in:
Julian Smith 2021-11-26 14:18:50 +00:00
parent 3bda847f65
commit a77eabb9dc
2 changed files with 24 additions and 2 deletions
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25
src/Time/TimeManager.cxx
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@ -90,6 +90,7 @@ void TimeManager::init()
_localTimeZoneNode = fgGetNode("/sim/time/local-timezone", true);
_warpDelta = fgGetNode("/sim/time/warp-delta", true);
_frameNumber = fgGetNode("/sim/frame-number", true);
_simFixedDt = fgGetNode("/sim/time/fixed-dt", true);
SGPath zone(globals->get_fg_root());
zone.append("Timezone");
@ -220,7 +221,27 @@ static double TimeUTC()
void TimeManager::computeTimeDeltasSimple(double& simDt, double& realDt)
{
double t = TimeUTC();
double t;
double fixed_dt = _simFixedDt->getDoubleValue();
static bool fixed_dt_prev = 0;
if (fixed_dt)
{
// Always increase time by fixed amount, regardless of elapsed
// time. E.g. this can be used to generate high-quality videos.
t = _simple_time_fdm + fixed_dt;
fixed_dt_prev = fixed_dt;
}
else
{
t = TimeUTC();
if (fixed_dt_prev)
{
// Avoid bogus sleep to match _maxFrameRate.
_simple_time_fdm = _simple_time_utc = t - fixed_dt_prev;
fixed_dt_prev = 0.0;
}
}
double modelHz = _modelHz->getDoubleValue();
bool scenery_loaded = _sceneryLoaded->getBoolValue();
@ -236,7 +257,7 @@ void TimeManager::computeTimeDeltasSimple(double& simDt, double& realDt)
// inline instead of calling throttleUpdateRate().
//
double sleep_time = 0;
if (scenery_loaded) {
if (scenery_loaded && !fixed_dt) {
double max_frame_rate = _maxFrameRate->getDoubleValue();
if (max_frame_rate != 0) {
double delay_end = _simple_time_utc + 1.0/max_frame_rate;

1
src/Time/TimeManager.hxx
View file

@ -108,6 +108,7 @@ private:
SGPropertyNode_ptr _localTimeStringNode;
SGPropertyNode_ptr _localTimeZoneNode;
SGPropertyNode_ptr _frameNumber;
SGPropertyNode_ptr _simFixedDt;
bool _lastClockFreeze = false;
bool _adjustWarpOnUnfreeze = false;