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display: don't render window if all its DRs are inactive

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This is an optimization, which will skip begin_frame/end_frame for a buffer that isn't going to have anything rendered to it.  Affects the RenderPipeline.
This commit is contained in:
rdb 2018-11-19 22:13:07 +01:00
parent e759a1b605
commit d902ea5ce4
1 changed files with 25 additions and 2 deletions
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27
panda/src/display/graphicsOutput.cxx
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@ -412,15 +412,38 @@ is_active() const {
return false;
}
CDReader cdata(_cycler);
CDLockedReader cdata(_cycler);
if (!cdata->_active) {
return false;
}
if (cdata->_one_shot_frame != -1) {
// If one_shot is in effect, then we are active only for the one indicated
// frame.
if (cdata->_one_shot_frame != ClockObject::get_global_clock()->get_frame_count()) {
return false;
} else {
return true;
}
}
return cdata->_active;
// If the window has a clear value set, it is active.
if (is_any_clear_active()) {
return true;
}
// If we triggered a copy operation, it is also active.
if (_trigger_copy) {
return true;
}
// The window is active if at least one display region is active.
if (cdata->_active_display_regions_stale) {
CDWriter cdataw(((GraphicsOutput *)this)->_cycler, cdata, false);
((GraphicsOutput *)this)->do_determine_display_regions(cdataw);
}
return !cdata->_active_display_regions.empty();
}
/**