[SOLVED] Frame rates using WidgetSpriteViewport

[craig.biggs_]

Hi,

 

I just had a few questions (possibly dumb) to clear up some confusion on my part with regards to the use of the -video_refresh option upon start up and the WidgetSpriteViewport::setIFPS call.

1) If you are purely using WidgetSpriteViewport for drawing to screen, is there any significance in the value passed for the -video_refresh option? ie can you completely control your frame rate via WidgetSpriteViewport::setIFPS?

2) If so, what happens if you set your IFPS to higher frame rate than the value passed for -video_refresh?

3) The FPS counter in the right top corner of the screen - does this have any significance for WidgetSpriteViewport? And say you are displaying more than 1 WidgetSpriteViewport at any point in time what does the FPS counter overlay mean?

4) I found setting call setEnabled(0) on a WidgetSpriteViewport and the FPS value was still being impacted by the disabled WidgetSpriteViewport (as if it was still drawing to screen). Is there any flag/function that you can call on a WidgetSpriteViewport to stop this from happening or should you just destroy the object altogether?

 

 

thanks

 

Craig

[ulf.schroeter]

Quite a lot of questions :) I would guess that at least all FPS setup and indication is related to the total render loop cycle (main + viewports) and physical buffer swap. So if you configure some fixed video refresh limit, viewport fps can never exceed this limit. it its possible to setup a lower viewport rendering frame rate than the main screen but in your use-case this does not seem to be required/wanted.

 

Also there are still some issues with fixed time delta rendering in viewports

 

https://developer.unigine.com/forum/topic/444-widgetspriteviewport-fixed-fps-rendering/page__p__2172__hl__viewport#entry2172

[manguste]

Hi Craig,

 

1) If you are purely using WidgetSpriteViewport for drawing to screen, is there any significance in the value passed for the -video_refresh option? ie can you completely control your frame rate via WidgetSpriteViewport::setIFPS?

2) If so, what happens if you set your IFPS to higher frame rate than the value passed for -video_refresh?

video_refresh option sets the maximum refresh rate for the window in which Unigine is rendered. (BTW, it's available only in Windows.) Hence, IFPS of WidgetSpriteViewport cannot be higher than that - if set higher, it would simply be clamped.

 

3) The FPS counter in the right top corner of the screen - does this have any significance for WidgetSpriteViewport? And say you are displaying more than 1 WidgetSpriteViewport at any point in time what does the FPS counter overlay mean?

Again, this is a framerate at which Unigine window is rendered. If you use 3 WidgetSpriteViewport widgets to render the world, that would basically mean a framerate used to rendrer all of them together.

 

4) I found setting call setEnabled(0) on a WidgetSpriteViewport and the FPS value was still being impacted by the disabled WidgetSpriteViewport (as if it was still drawing to screen). Is there any flag/function that you can call on a WidgetSpriteViewport to stop this from happening or should you just destroy the object altogether?

Disabling a widget is not like disabling node. It means, that its options are unavailable, but you can still see them, so they do affect FPS. For example, here are disabled comboboxes:

 

 

What you need is hiding a widget via Widget::setHidden().