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fix: correct implementation of present interval 0 for unlocked FPS

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Fixes issues in commit bbd32531697fbfb8ed5b6859d3951bf8380e5999 that could cause
crashes and deadlocks. The feature now works as intended, allowing games using
present interval 0 to run with truly unlocked FPS.

This ensures proper functionality of dynamic framerate mods like UltraCam
by MaxLastBreath (https://www.nxoptimizer.com/) without stability problems.

Signed-off-by: Zephyron <zephyron@citron-emu.org>
This commit is contained in:
Zephyron 2025-04-18 10:11:16 +10:00 committed by Mike Lothian
parent ea8bb22148
commit c8ee0041f2
1 changed files with 6 additions and 13 deletions
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19
src/core/hle/service/nvnflinger/hardware_composer.cpp
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@ -21,31 +21,24 @@ namespace {
s32 NormalizeSwapInterval(f32* out_speed_scale, s32 swap_interval) {
if (swap_interval <= 0) {
// If swap_interval is 0 and setting enabled, respect it as unlocked FPS
if (swap_interval == 0 && Settings::values.respect_present_interval_zero.GetValue()) {
if (out_speed_scale) {
*out_speed_scale = 1.0f;
}
return 0;
}
// As an extension, treat nonpositive swap interval as speed multiplier.
if (out_speed_scale) {
*out_speed_scale = 2.f * static_cast<f32>(1 - swap_interval);
}
swap_interval = 1;
// Only normalize swap_interval to 1 if we're not respecting present interval 0
if (swap_interval == 0 && Settings::values.respect_present_interval_zero.GetValue()) {
// Keep swap_interval as 0 to allow for unlocked FPS
} else {
swap_interval = 1;
}
}
if (swap_interval >= 5) {
// As an extension, treat high swap interval as precise speed control.
if (out_speed_scale) {
*out_speed_scale = static_cast<f32>(swap_interval) / 100.f;
}
swap_interval = 1;
}
return swap_interval;
}