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feat: add option to respect present interval 0 as unlocked FPS

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When enabled, this feature allows games using present interval 0 to run with
truly unlocked FPS, matching actual hardware behavior more accurately.

Previously, Citron would cap present interval 0 at 120FPS to conserve battery,
but this prevented proper functionality of dynamic framerate mods like UltraCam
by MaxLastBreath (https://www.nxoptimizer.com/).

The setting is disabled by default to maintain the current behavior for most users.

Signed-off-by: Zephyron <zephyron@citron-emu.org>
This commit is contained in:
Zephyron 2025-04-16 19:28:15 +10:00
parent a1f3414bde
commit bbd3253169
3 changed files with 18 additions and 0 deletions
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10
src/core/hle/service/nvnflinger/hardware_composer.cpp
View file

@ -1,9 +1,11 @@
// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
// SPDX-FileCopyrightText: Copyright 2025 citron Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
#include <boost/container/small_vector.hpp>
#include "common/microprofile.h"
#include "common/settings.h"
#include "core/hle/service/nvdrv/devices/nvdisp_disp0.h"
#include "core/hle/service/nvnflinger/buffer_item.h"
#include "core/hle/service/nvnflinger/buffer_item_consumer.h"
@ -17,6 +19,14 @@ 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);