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fix(nvnflinger): exclude overlay layers from frame timing calculation

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Signed-off-by: Zephyron <zephyron@citron-emu.org>
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Zephyron
2026-02-14 12:20:26 +10:00
parent 5ec6c493f2
commit 4af75b7544
1 changed files with 18 additions and 8 deletions
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26
src/core/hle/service/nvnflinger/hardware_composer.cpp
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@@ -93,15 +93,25 @@ u32 HardwareComposer::ComposeLocked(f32* out_speed_scale, Display& display,
// We need to compose again either before this frame is supposed to // We need to compose again either before this frame is supposed to
// be released, or exactly on the vsync period it should be released. // be released, or exactly on the vsync period it should be released.
const s32 item_swap_interval = NormalizeSwapInterval(out_speed_scale, item.swap_interval); //
// Only non-overlay layers should affect frame timing. Overlay layers
// (e.g., system applets like QLaunch's overlay display) may queue buffers
// with swap_interval=0 or 1 for responsive UI updates. Including these in
// the min() calculation would incorrectly lower the game's intended
// swap_interval (e.g., from 2 to 1), causing the Conductor to schedule
// vsync events at 60 Hz instead of 30 Hz and doubling emulation speed.
if (!layer->is_overlay) {
const s32 item_swap_interval =
NormalizeSwapInterval(out_speed_scale, item.swap_interval);
// TODO: handle cases where swap intervals are relatively prime. So far, // TODO: handle cases where swap intervals are relatively prime. So far,
// only swap intervals of 0, 1 and 2 have been observed, but if 3 were // only swap intervals of 0, 1 and 2 have been observed, but if 3 were
// to be introduced, this would cause an issue. // to be introduced, this would cause an issue.
if (swap_interval) { if (swap_interval) {
swap_interval = std::min(*swap_interval, item_swap_interval); swap_interval = std::min(*swap_interval, item_swap_interval);
} else { } else {
swap_interval = item_swap_interval; swap_interval = item_swap_interval;
}
} }
} }