Win32: Add d3dkmt + Scanline Sync#18974
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LibretroAdmin merged 3 commits intolibretro:masterfrom Apr 24, 2026
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I've never seen such low latency using an emulator on a Windows PC!! |
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Description
Getting the current scanline requires adding
d3dkmtheaders to the repo, which are copied from MSVC. Here makefile enables it also when enabling D3D12. Perhaps there is a better place for it, since it should be possible for Vista and up, for good enough for now.Should be simple enough to add more platforms that are able to receive the same scanline data.
Scanline Sync is basically Auto Frame Delay at 99%, but more accurate and stable. Unlike normal rigid vsync which will stutter and drop frames this will try to dynamically keep the eventual tearlines hidden inside vertical blanking. It also tries to sleep as much as possible without drawbacks while waiting for the costly scanline, which keeps CPU temperatures down a lot. And it disables itself for a while if the core frame takes too long to generate or if they have too much deviation.