tree d4d3b0de84c06144e56a38d3fbf29690156f344d
parent e8c231eb45293fc501c3d27db6f4fe70d0f77ee4
author danginsburg <dginsburg@upsamplesoftware.com> 1590076850 -0400
committer danginsburg <dginsburg@upsamplesoftware.com> 1590076850 -0400

Add support for VK_GOOGLE_display_timing.  Some notes:
* vkGetRefreshCycleDurationGOOGLE is implemented for iOS using UIScreen maximumFramesPerSecond.  I did not implement it for macOS (just hard-coded to 60).  It looks like doing it will require using CGDisplayModeGetRefreshRate
* vkGetPastPresentationTimingGOOGLE fills in the actualPresentationTime, but Metal does not provide the earlierPresentTime or the presentMargin as far as I can tell so earliestPresentTime is set to actualPresentTime and presentMargin is zero.
* Tested mostly on iOS - confirmed with Metal System Trace that desiredPresentTime works properly aligning the presentation correctly with vsync.