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steamcompmgr: throttle frame callbacks to output refresh rate with VRR #2115

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steamcompmgr: throttle frame callbacks to output refresh rate with VRR #2115

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18 changes: 18 additions & 0 deletions src/steamcompmgr.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5682,6 +5682,24 @@ static bool steamcompmgr_should_vblank_window( bool bShouldLimitFPS, uint64_t vb

static bool steamcompmgr_should_vblank_window( steamcompmgr_win_t *w, uint64_t vblank_idx, uint64_t now )
{
// Overlays skip the FPS-limit throttle, so cap them to the output refresh under VRR.
if ( w && w->IsAnyOverlay() &&
GetBackend()->GetCurrentConnector() && GetBackend()->GetCurrentConnector()->IsVRRActive() )
{
uint64_t schedule = w->last_commit_first_latch_time + g_SteamCompMgrAppRefreshCycle;

static constexpr uint64_t k_ulVRRScheduleFudge = 200'000; // 0.2ms
if ( now + k_ulVRRScheduleFudge < schedule )
{
if ( !s_oLowestFPSLimitScheduleVRR )
s_oLowestFPSLimitScheduleVRR = schedule;
else
s_oLowestFPSLimitScheduleVRR = std::min( *s_oLowestFPSLimitScheduleVRR, schedule );

return false;
}
}

return steamcompmgr_should_vblank_window( steamcompmgr_window_should_limit_fps( w ), vblank_idx, w, now );
}

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