From 3b433d8d3ecc883cb31fa7038023f2b2b316bc11 Mon Sep 17 00:00:00 2001
From: Connor McLaughlin <stenzek@gmail.com>
Date: Wed, 13 Jan 2021 20:09:30 +1000
Subject: [PATCH] Android: Add sustained performance mode option

---
 .../duckstation/EmulationActivity.java        | 19 +++++++++++++++++++
 android/app/src/main/res/values/strings.xml   |  2 ++
 .../src/main/res/xml/advanced_preferences.xml |  6 ++++++
 3 files changed, 27 insertions(+)

diff --git a/android/app/src/main/java/com/github/stenzek/duckstation/EmulationActivity.java b/android/app/src/main/java/com/github/stenzek/duckstation/EmulationActivity.java
index 53f9169c7..eb5cdf55d 100644
--- a/android/app/src/main/java/com/github/stenzek/duckstation/EmulationActivity.java
+++ b/android/app/src/main/java/com/github/stenzek/duckstation/EmulationActivity.java
@@ -16,6 +16,7 @@ import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.SurfaceHolder;
 import android.view.View;
+import android.view.Window;
 import android.view.WindowManager;
 import android.widget.FrameLayout;
 import android.widget.Toast;
@@ -164,6 +165,7 @@ public class EmulationActivity extends AppCompatActivity implements SurfaceHolde
         AndroidHostInterface.getInstance().applySettings();
         updateRequestedOrientation();
         updateControllers();
+        updateSustainedPerformanceMode();
     }
 
     private void applySettings() {
@@ -255,6 +257,7 @@ public class EmulationActivity extends AppCompatActivity implements SurfaceHolde
         // Sort out rotation.
         updateRequestedOrientation();
         updateOrientation();
+        updateSustainedPerformanceMode();
 
         // Hook up controller input.
         updateControllers();
@@ -674,4 +677,20 @@ public class EmulationActivity extends AppCompatActivity implements SurfaceHolde
                 mVibratorService.cancel();
         });
     }
+
+    private boolean mSustainedPerformanceModeEnabled = false;
+    private void updateSustainedPerformanceMode() {
+        final boolean enabled = getBooleanSetting("Main/SustainedPerformanceMode", false);
+        if (mSustainedPerformanceModeEnabled == enabled)
+            return;
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            getWindow().setSustainedPerformanceMode(enabled);
+            Log.i("EmulationActivity", String.format("%s sustained performance mode.", enabled ? "enabling" : "disabling"));
+        } else {
+            Log.e("EmulationActivity", "Sustained performance mode not supported.");
+        }
+        mSustainedPerformanceModeEnabled = enabled;
+
+    }
 }
diff --git a/android/app/src/main/res/values/strings.xml b/android/app/src/main/res/values/strings.xml
index 4e9aae80a..8f18a66fc 100644
--- a/android/app/src/main/res/values/strings.xml
+++ b/android/app/src/main/res/values/strings.xml
@@ -193,4 +193,6 @@
     <string name="settings_summary_audio_resampling">When running outside of 100% speed, resamples audio from the target speed instead of dropping frames. Produces much nicer fast forward/slowdown audio at a small cost to performance.</string>
     <string name="settings_general_sync_to_host_refresh_rate">Sync To Host Refresh Rate</string>
     <string name="settings_summary_general_sync_to_host_refresh_rate">Adjusts the emulation speed so the console\'s refresh rate matches the host\'s refresh rate, when VSync and Audio Resampling is enabled. This results in the smoothest animations possible, at the cost of potentially increasing the emulation speed by less than 1%.</string>
+    <string name="settings_sustained_performance_mode">Sustained Performance Mode</string>
+    <string name="settings_summary_sustained_performance_mode">Enables Android\'s sustained performance mode. May result in more consistent framerates for long sessions on some devices.</string>
 </resources>
diff --git a/android/app/src/main/res/xml/advanced_preferences.xml b/android/app/src/main/res/xml/advanced_preferences.xml
index c392f9219..83dab7b56 100644
--- a/android/app/src/main/res/xml/advanced_preferences.xml
+++ b/android/app/src/main/res/xml/advanced_preferences.xml
@@ -29,6 +29,12 @@
         app:defaultValue="false"
         app:summary="@string/settings_summary_disable_all_enhancements"
         app:iconSpaceReserved="false" />
+    <SwitchPreferenceCompat
+        app:key="Main/SustainedPerformanceMode"
+        app:title="@string/settings_sustained_performance_mode"
+        app:defaultValue="false"
+        app:summary="@string/settings_summary_sustained_performance_mode"
+        app:iconSpaceReserved="false" />
     <ListPreference
         app:key="CPU/Overclock"
         app:title="@string/settings_cpu_overclocking"