GS: Improve vsync mode selection

[stenzek]

Description of Changes

All games use mailbox/triple buffering. Except when you enable sync to host refresh, in which case FIFO/double buffering is used.

This means vsync enabled will ever tear, but at the same time, never drop to 30fps on a missed frame due to frame rate differences. Unless you're using OpenGL, because that doesn't support triple buffering, in which case, too bad.

To have the "best of both worlds", you should enable vsync and sync to host refresh. Previously, this resulted in additional input lag, since the host vsync would drive the EE frame timing. Now, this behaviour is disabled by default, unless you enable "Use Host VSync Timing".

Rationale behind Changes

Trying to make both stutter-wanters and tear-wanters happy.

Suggested Testing Steps

Hammer vsync options.

[ichee]

Tested all the vsync options.

Vsync alone stutters.

Vsync and sync to host runs fine and without running at unlimited framerate, same as vsync alone on previous builds.

Vsync, sync to host, and use host timing works fine as well, albeit with higher input lag as noted.

So all in working order.

Just in case it was missed before, setting the nvidia control panel option Vulkan/OpenGL present method to
Prefer layered on DXGI Swapchain allows vsync only to work just fine without stutter, tearing, or added input lag in fullscreen.

Thanks.

[stenzek]

Added manual presentation throttling, i.e. you can toggle the frame limiter on/off without recreating the swap chain.
AMD will fall back to FIFO since mailbox isn't supported.

[MrPillze]

i have always found on a non vrr screen turning vsync off in everything and only using the vsync option in the nvidia control panal has yielded the best results for me, would there be a preferred way to use vsync and other options in the emulator now or? sorry if this is not the place to ask :)

[stenzek]

Please use the discord server or forums for support, this is not the place.