[hw_composer]: Add "Respect present interval 0 for unlocked FPS"

Co-authored-by: Zephyron <zephyron@citron-emu.org>

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/model/BooleanSetting.kt

@@ -53,6 +53,7 @@ enum class BooleanSetting(override val key: String) : AbstractBooleanSetting {
 
     SOC_OVERLAY_BACKGROUND("soc_overlay_background"),
     ENABLE_INPUT_OVERLAY_AUTO_HIDE("enable_input_overlay_auto_hide"),
+    RESPECT_PRESENT_INTERVAL_ZERO("respect_present_interval_zero"),
 
     PERF_OVERLAY_BACKGROUND("perf_overlay_background"),
     SHOW_PERFORMANCE_OVERLAY("show_performance_overlay"),

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/model/view/SettingsItem.kt

@@ -237,6 +237,13 @@ abstract class SettingsItem(
                 override fun reset() = BooleanSetting.USE_DOCKED_MODE.reset()
             }
 
+            put(
+                SwitchSetting(
+                    BooleanSetting.RESPECT_PRESENT_INTERVAL_ZERO,
+                    titleId = R.string.respect_present_interval_zero,
+                    descriptionId = R.string.respect_present_interval_zero_description
+                )
+            )
             put(
                 SwitchSetting(
                     dockedModeSetting,

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/ui/SettingsFragmentPresenter.kt

@@ -460,6 +460,7 @@ class SettingsFragmentPresenter(
             add(IntSetting.RENDERER_SAMPLE_SHADING_FRACTION.key)
 
             add(HeaderSetting(R.string.veil_renderer))
+            add(BooleanSetting.RESPECT_PRESENT_INTERVAL_ZERO.key)
             add(BooleanSetting.RENDERER_EARLY_RELEASE_FENCES.key)
             add(IntSetting.DMA_ACCURACY.key)
             add(BooleanSetting.BUFFER_REORDER_DISABLE.key)

src/android/app/src/main/res/values/strings.xml

@@ -105,6 +105,8 @@
     <string name="sample_shading_fraction_description">The intensity of the sample shading pass. Higher values improve quality more but also reduce performance to a greater extent.</string>
 
     <string name="veil_renderer">Renderer</string>
+    <string name="respect_present_interval_zero">Respect present interval 0 for unlocked FPS</string>
+    <string name="respect_present_interval_zero_description">When enabled, present interval 0 will be used for games requesting unlocked FPS. This matches console behavior more closely, but may cause higher battery usage and frame pacing issues. When disabled (default), present interval 0 is capped at 120FPS to conserve battery.</string>
     <string name="renderer_early_release_fences">Release Fences Early</string>
     <string name="renderer_early_release_fences_description">Helps fix 0 FPS in games like DKCR:HD, Subnautica Below Zero and Ori 2, but may break loading or performance in Unreal Engine games.</string>
     <string name="sync_memory_operations">Sync Memory Operations</string>

src/common/settings.h

@@ -342,6 +342,9 @@ struct Values {
                                                                      Category::Renderer};
     SwitchableSetting<bool> use_asynchronous_gpu_emulation{
                                                            linkage, true, "use_asynchronous_gpu_emulation", Category::Renderer};
+    SwitchableSetting<bool> respect_present_interval_zero{
+                                                          linkage, false, "respect_present_interval_zero", Category::Renderer};
+
     SwitchableSetting<AstcDecodeMode, true> accelerate_astc{linkage,
 #ifdef ANDROID
                                                             AstcDecodeMode::Cpu,

src/core/hle/service/nvnflinger/hardware_composer.cpp

@@ -8,6 +8,8 @@
 
 #include <boost/container/small_vector.hpp>
 
+#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"
@@ -21,6 +23,14 @@ 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);

src/qt_common/config/shared_translation.cpp

@@ -213,6 +213,11 @@ std::unique_ptr<TranslationMap> InitializeTranslations(QObject* parent)
         use_asynchronous_gpu_emulation,
         tr("Use asynchronous GPU emulation"),
         tr("Uses an extra CPU thread for rendering.\nThis option should always remain enabled."));
+    INSERT(
+        Settings, respect_present_interval_zero, tr("Respect present interval 0 for unlocked FPS"),
+        tr("When enabled, present interval 0 will be used for games requesting unlocked FPS.\n"
+           "This matches console behavior more closely, but may cause higher battery usage and frame pacing issues.\n"
+           "When disabled (default), present interval 0 is capped at 120FPS to conserve battery."));
     INSERT(Settings,
            nvdec_emulation,
            tr("NVDEC emulation:"),