Re: RFC for a render API to support adaptive sync and VRR

Michel Dänzer michel@daenzer.net writes:

Time-based presentation seems to be the right approach for preventing micro-stutter in games as well, Croteam developers have been researching this.

Both the Vulkan GOOGLE_display_timing extension and X11 Present extension offer the ability to specify the desired display time in seconds.

Similarly, I'd suggest that the min/max display refresh rate values be advertised as time between frames rather than frames per second.

I'd also encourage using a single unit for all of these values, preferably nanoseconds. Absolute times should all be referenced to CLOCK_MONOTONIC.