Vsync?

[Mark Sibly]

Hi,

Is there any way to control vsync in dawn?

I vaguely remember this being discussed before, but searching for vsync, setswapinterval etc isn't giving any hits.

Bye,

Mark

[Mark Sibly]

OK, using PresentMode::Fifo in the SwapChainDescriptor seems to fix my vsync issues. My render loop is now locked to 60hz (with my graphics card's 'vsync setting' set to 'use application setting').

I had been using PresentMode::Mailbox, probably because the dawn samples must have used this at some point I guess.

But what is the difference anyway? Is this the right thing to do? Is it OK to treat Fifo as vsync=on and Mailbox as vsync=off?

Bye,

Mark

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[Austin Eng]

With FIFO, there is a queue of presentation requests. The display engine takes and presents images out of this queue, so yes the rate at which entries in the queue are removed and a new image becomes available to you for rendering is locked to vsync.

With Mailbox mode, there is a single presentation request. Every presentation replaces it (in a non-tearing way), and you can replace it at a rate that is not synchronized with vsync.

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[Mark Sibly]

Thanks Austin!