what is really happening in full screen mode?

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cyrfer
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what is really happening in full screen mode?

Post by cyrfer »

Hi,
I've been trying to figure out what is the definition of "full screen mode". Is it simply a window with no border that is the same size as the desktop? Does the graphics card perform better than when you render to a window that is smaller than the desktop? Why would the performance be better? If so, are any special flags required to create such a window, on Windows? If I create the window myself, and give the handle to RenderWindow when creating the RenderWindow, does the RenderSystem need to be informed that the window is a full-screen window?
Thanks!
lilezek
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Re: what is really happening in full screen mode?

Post by lilezek »

What OS are you talking about?

In windows the direct draw driver makes your monitor not to draw anything but that the application is telling to draw, as far as I know.

About the performance, I think is the same. Maybe window mode (if both window and full screen are the same resolution) is a bit worse.

And if it is full screen you don't need to have any window because full screen doesn't need a window.
cyrfer
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Re: what is really happening in full screen mode?

Post by cyrfer »

This response wasn't very helpful. I'm asking for help understanding what is full screen mode.
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jacmoe
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Re: what is really happening in full screen mode?

Post by jacmoe »

It's not windowed.

That's essentially what it is.
No cooperation, no syncing, no nothing.
Which is why it's usually faster.
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Kojack
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Re: what is really happening in full screen mode?

Post by Kojack »

Full screen mode is able to change the resolution, colour mode and refresh rate of the screen, while windowed runs using the current desktop settings. It can take monitors a few seconds to adjust to new screen modes, which is why they tend to go black for a bit when you start or alt-tab a full screen app. Windowed mode apps don't have that delay.

A full screen mode app will lose it's device when it loses focus. If you have a dual monitor setup and you click the mouse on the monitor other than where a full screen app is running, the app will disappear until it has focus again. This got REALLY annoying for me in WOW years ago, until I discovered the setting for borderless maximised windowed mode (looks like full screen, but has the app/focus switching speed of windowed).

There's more full screen details in the directx sdk help files, going into stuff about swap chains, exclusive mode access, multihead issues, etc.
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Beauty
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Re: what is really happening in full screen mode?

Post by Beauty »

Good description(s). :D

I added them to the wiki:
http://www.ogre3d.org/tikiwiki/-Full+Screen+mode
It's no nice lexicon page, but so the information is save and people can find it easily.
Help to add information to the wiki. Also tiny edits will let it grow ... :idea:
Add your country to your profile ... it's interesting to know from where of the world you are.
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Re: what is really happening in full screen mode?

Post by reptor »

Beauty, thank you for your work on the ogre wiki.
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