Move dead submodules in-tree

Signed-off-by: swurl <swurl@swurl.xyz>

externals/oboe/samples/MegaDrone/.gitignore

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+/build

externals/oboe/samples/MegaDrone/README.md

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+Mega Drone
+==========
+Ever wondered what 100 square waves sound like when played together? Well now you can find out! 
+
+Mega Drone is an app which creates 100 oscillators, combines their output in a mixer and plays the resulting sound.
+
+This sample demonstrates how to obtain the lowest latency and optimal computational throughput by:
+
+1) Leaving Oboe to choose the best default stream properties for the current device
+2) Setting performance mode to LowLatency
+3) Setting sharing mode to Exclusive
+4) Setting the buffer size to 2 bursts
+5) Using the `-Ofast` compiler optimization flag, even when building the `Debug` variant
+6) Using [`getExclusiveCores`](https://developer.android.com/reference/android/os/Process#getExclusiveCores()) (API 24+) and thread affinity to bind the audio thread to the best available CPU core(s)
+
+This code was presented at [AES Milan](http://www.aes.org/events/144/) and [Droidcon Berlin](https://www.de.droidcon.com/) as part of a talk on Oboe.
+
+The [following article explaining how to debug CPU performance problems](https://medium.com/@donturner/debugging-audio-glitches-on-android-ed10782f9c64) may also be useful when looking at this code.
+
+Implementation details
+---
+The stream properties are left to Oboe as such the app must output audio data in a format which matches that of the stream. 
+
+Four different formats are supported: 
+
+|Channel count|Format|
+|-------------|------|
+|1 - Mono|16-bit int|
+|2 - Stereo|16-bit int|
+|1 - Mono|Float|
+|2 - Stereo|Float|
+
+The signal chain for mono streams is: 
+
+    Oscillators->Mixer
+
+For stereo chains a mono to stereo converter is added to the end of the chain: 
+
+    Oscillators->Mixer->MonoToStereo
+ 
+The compiler optimization flag `-Ofast` can be found in [CMakeLists.txt](CMakeLists.txt). 
+ 
+Screenshots
+-----------
+![megadrone-screenshot](megadrone-screenshot.png)

externals/oboe/samples/MegaDrone/build.gradle

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+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+
+android {
+    defaultConfig {
+        applicationId "com.google.oboe.samples.megadrone"
+        minSdkVersion 21
+        targetSdkVersion 35
+        compileSdkVersion 35
+        versionCode 1
+        versionName "1.0"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        externalNativeBuild {
+            cmake {
+                cppFlags "-std=c++17"
+                abiFilters 'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
+            }
+        }
+    }
+    signingConfigs {
+        release {
+            storeFile new File("${System.properties['user.home']}/.android/debug.keystore")
+            storePassword 'android'
+            storeType "jks"
+            keyAlias 'androiddebugkey'
+            keyPassword 'android'
+        }
+    }
+    buildTypes {
+        release {
+            signingConfig signingConfigs.release
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            debuggable false
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_18
+        targetCompatibility JavaVersion.VERSION_18
+    }
+    externalNativeBuild {
+        cmake {
+            path "src/main/cpp/CMakeLists.txt"
+        }
+    }
+    namespace 'com.google.oboe.samples.megadrone'
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'androidx.appcompat:appcompat:1.7.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.2.1'
+}

externals/oboe/samples/MegaDrone/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

externals/oboe/samples/MegaDrone/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name="com.google.oboe.samples.megadrone.MainActivity"
+            android:screenOrientation="portrait"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

externals/oboe/samples/MegaDrone/src/main/cpp/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.4.1)
+
+
+### INCLUDE OBOE LIBRARY ###
+
+# Set the path to the Oboe library directory
+set (OBOE_DIR ../../../../..)
+
+# Add the Oboe library as a subproject. Since Oboe is an out-of-tree source library we must also
+# specify a binary directory
+add_subdirectory(${OBOE_DIR} ./oboe-bin)
+
+# Include the Oboe headers
+include_directories(${OBOE_DIR}/include ${OBOE_DIR}/samples/shared ${OBOE_DIR}/samples/debug-utils)
+
+
+### END OBOE INCLUDE SECTION ###
+
+add_library( megadrone SHARED
+        native-lib.cpp
+        MegaDroneEngine.cpp
+        )
+
+target_link_libraries(megadrone log oboe )
+target_link_options(megadrone PRIVATE "-Wl,-z,max-page-size=16384")
+
+# Enable optimization flags: if having problems with source level debugging,
+# disable -Ofast ( and debug ), re-enable it after done debugging.
+target_compile_options(megadrone PRIVATE -Wall -Werror -Ofast)

externals/oboe/samples/MegaDrone/src/main/cpp/MegaDroneEngine.cpp

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+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#include <memory>
+#include "MegaDroneEngine.h"
+
+/**
+ * Main audio engine for the MegaDrone sample. It is responsible for:
+ *
+ * - Creating the callback object which will be supplied when constructing the audio stream
+ * - Setting the CPU core IDs to which the callback thread should bind to
+ * - Creating the playback stream, including setting the callback object
+ * - Creating `Synth` which will render the audio inside the callback
+ * - Starting the playback stream
+ * - Restarting the playback stream when `restart()` is called by the callback object
+ *
+ * @param cpuIds
+ */
+MegaDroneEngine::MegaDroneEngine(std::vector<int> cpuIds) {
+    createCallback(cpuIds);
+}
+
+MegaDroneEngine::~MegaDroneEngine() {
+    if (mStream) {
+        LOGE("MegaDroneEngine destructor was called without calling stop()."
+             "Please call stop() to ensure stream resources are not leaked.");
+        stop();
+    }
+}
+
+void MegaDroneEngine::tap(bool isDown) {
+    mAudioSource->tap(isDown);
+}
+
+void MegaDroneEngine::restart() {
+    stop();
+    start();
+}
+// Create the playback stream
+oboe::Result MegaDroneEngine::createPlaybackStream() {
+    oboe::AudioStreamBuilder builder;
+    return builder.setSharingMode(oboe::SharingMode::Exclusive)
+            ->setPerformanceMode(oboe::PerformanceMode::LowLatency)
+            ->setFormat(oboe::AudioFormat::Float)
+            ->setDataCallback(mDataCallback)
+            ->setErrorCallback(mErrorCallback)
+            ->openStream(mStream);
+}
+
+// Create the callback and set its thread affinity to the supplied CPU core IDs
+void MegaDroneEngine::createCallback(std::vector<int> cpuIds){
+
+    mDataCallback = std::make_shared<DefaultDataCallback>();
+
+    // Create the error callback, we supply ourselves as the parent so that we can restart the stream
+    // when it's disconnected
+    mErrorCallback = std::make_shared<DefaultErrorCallback>(*this);
+
+    // Bind the audio callback to specific CPU cores as this can help avoid underruns caused by
+    // core migrations
+    mDataCallback->setCpuIds(cpuIds);
+    mDataCallback->setThreadAffinityEnabled(true);
+}
+
+bool MegaDroneEngine::start() {
+    // It is possible for a stream's device to become disconnected during stream open or between
+    // stream open and stream start.
+    // If the stream fails to start, close the old stream and try again.
+    bool didStart = false;
+    int tryCount = 0;
+    do {
+        if (tryCount > 0) {
+            usleep(20 * 1000); // Sleep between tries to give the system time to settle.
+        }
+        didStart = attemptStart();
+    } while (!didStart && tryCount++ < 3);
+    if (!didStart) {
+        LOGE("Failed at starting the stream");
+    }
+    return didStart;
+}
+
+bool MegaDroneEngine::attemptStart() {
+    auto result = createPlaybackStream();
+
+    if (result == Result::OK) {
+        // Create our synthesizer audio source using the properties of the stream
+        mAudioSource = std::make_shared<Synth>(mStream->getSampleRate(), mStream->getChannelCount());
+        mDataCallback->reset();
+        mDataCallback->setSource(std::dynamic_pointer_cast<IRenderableAudio>(mAudioSource));
+        result = mStream->start();
+        if (result == Result::OK) {
+            return true;
+        } else {
+            LOGW("Failed attempt at starting the playback stream. Error: %s", convertToText(result));
+            return false;
+        }
+    } else {
+        LOGW("Failed attempt at creating the playback stream. Error: %s", convertToText(result));
+        return false;
+    }
+}
+
+bool MegaDroneEngine::stop() {
+    if(mStream && mStream->getState() != oboe::StreamState::Closed) {
+        mStream->stop();
+        mStream->close();
+    }
+    mStream.reset();
+    return true;
+}
+

externals/oboe/samples/MegaDrone/src/main/cpp/MegaDroneEngine.h

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+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MEGADRONE_ENGINE_H
+#define MEGADRONE_ENGINE_H
+
+
+#include <oboe/Oboe.h>
+#include <vector>
+
+#include "Synth.h"
+#include <DefaultDataCallback.h>
+#include <TappableAudioSource.h>
+#include <IRestartable.h>
+#include <DefaultErrorCallback.h>
+
+using namespace oboe;
+
+class MegaDroneEngine : public IRestartable {
+
+public:
+    MegaDroneEngine(std::vector<int> cpuIds);
+
+    virtual ~MegaDroneEngine();
+
+    void tap(bool isDown);
+
+    // from IRestartable
+    virtual void restart() override;
+
+    bool start();
+    bool stop();
+
+private:
+    std::shared_ptr<AudioStream> mStream;
+    std::shared_ptr<TappableAudioSource> mAudioSource;
+    std::shared_ptr<DefaultDataCallback> mDataCallback;
+    std::shared_ptr<DefaultErrorCallback> mErrorCallback;
+
+    bool attemptStart();
+    oboe::Result createPlaybackStream();
+    void createCallback(std::vector<int> cpuIds);
+};
+
+
+#endif //MEGADRONE_ENGINE_H

externals/oboe/samples/MegaDrone/src/main/cpp/Synth.h

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+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MEGADRONE_SYNTH_H
+#define MEGADRONE_SYNTH_H
+
+#include <array>
+#include <TappableAudioSource.h>
+
+#include <Oscillator.h>
+#include <Mixer.h>
+#include <MonoToStereo.h>
+
+constexpr int kNumOscillators = 100;
+constexpr float kOscBaseFrequency = 116.0;
+constexpr float kOscDivisor = 33;
+constexpr float kOscAmplitude = 0.009;
+
+
+class Synth : public TappableAudioSource {
+public:
+
+    Synth(int32_t sampleRate, int32_t channelCount) :
+    TappableAudioSource(sampleRate, channelCount) {
+        for (int i = 0; i < kNumOscillators; ++i) {
+            mOscs[i].setSampleRate(mSampleRate);
+            mOscs[i].setFrequency(kOscBaseFrequency + (static_cast<float>(i) / kOscDivisor));
+            mOscs[i].setAmplitude(kOscAmplitude);
+            mMixer.addTrack(&mOscs[i]);
+        }
+        if (mChannelCount == oboe::ChannelCount::Stereo) {
+            mOutputStage =  &mConverter;
+        } else {
+            mOutputStage = &mMixer;
+        }
+    }
+
+    void tap(bool isOn) override {
+        for (auto &osc : mOscs) osc.setWaveOn(isOn);
+    };
+
+    // From IRenderableAudio
+    void renderAudio(float *audioData, int32_t numFrames) override {
+        mOutputStage->renderAudio(audioData, numFrames);
+    };
+
+    virtual ~Synth() {
+    }
+private:
+    // Rendering objects
+    std::array<Oscillator, kNumOscillators> mOscs;
+    Mixer mMixer;
+    MonoToStereo mConverter = MonoToStereo(&mMixer);
+    IRenderableAudio *mOutputStage; // This will point to either the mixer or converter, so it needs to be raw
+};
+
+
+#endif //MEGADRONE_SYNTH_H

externals/oboe/samples/MegaDrone/src/main/cpp/native-lib.cpp

@@ -0,0 +1,96 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <jni.h>
+#include <string>
+#include <vector>
+
+#include "MegaDroneEngine.h"
+
+
+std::vector<int> convertJavaArrayToVector(JNIEnv *env, jintArray intArray) {
+    std::vector<int> v;
+    jsize length = env->GetArrayLength(intArray);
+    if (length > 0) {
+        jint *elements = env->GetIntArrayElements(intArray, nullptr);
+        v.insert(v.end(), &elements[0], &elements[length]);
+        // Unpin the memory for the array, or free the copy.
+        env->ReleaseIntArrayElements(intArray, elements, 0);
+    }
+    return v;
+}
+
+extern "C" {
+/**
+ * Start the audio engine
+ *
+ * @param env
+ * @param instance
+ * @param jCpuIds - CPU core IDs which the audio process should affine to
+ * @return a pointer to the audio engine. This should be passed to other methods
+ */
+JNIEXPORT jlong JNICALL
+Java_com_google_oboe_samples_megadrone_MainActivity_startEngine(JNIEnv *env, jobject /*unused*/,
+                                                         jintArray jCpuIds) {
+    std::vector<int> cpuIds = convertJavaArrayToVector(env, jCpuIds);
+    LOGD("cpu ids size: %d", static_cast<int>(cpuIds.size()));
+    MegaDroneEngine  *engine = new MegaDroneEngine(std::move(cpuIds));
+
+    if (!engine->start()) {
+        LOGE("Failed to start MegaDrone Engine");
+        delete engine;
+        engine = nullptr;
+    } else  {
+        LOGD("Engine Started");
+    }
+    return reinterpret_cast<jlong>(engine);
+}
+
+JNIEXPORT void JNICALL
+Java_com_google_oboe_samples_megadrone_MainActivity_stopEngine(JNIEnv *env, jobject instance,
+        jlong jEngineHandle) {
+    auto engine = reinterpret_cast<MegaDroneEngine*>(jEngineHandle);
+    if (engine) {
+        engine->stop();
+        delete engine;
+    } else {
+        LOGD("Engine invalid, call startEngine() to create");
+    }
+}
+
+
+JNIEXPORT void JNICALL
+Java_com_google_oboe_samples_megadrone_MainActivity_tap(JNIEnv *env, jobject instance,
+        jlong jEngineHandle, jboolean isDown) {
+
+    auto *engine = reinterpret_cast<MegaDroneEngine*>(jEngineHandle);
+    if (engine) {
+        engine->tap(isDown);
+    } else {
+        LOGE("Engine handle is invalid, call createEngine() to create a new one");
+    }
+}
+
+JNIEXPORT void JNICALL
+Java_com_google_oboe_samples_megadrone_MainActivity_native_1setDefaultStreamValues(JNIEnv *env,
+                                                                            jclass type,
+                                                                            jint sampleRate,
+                                                                            jint framesPerBurst) {
+    oboe::DefaultStreamValues::SampleRate = (int32_t) sampleRate;
+    oboe::DefaultStreamValues::FramesPerBurst = (int32_t) framesPerBurst;
+}
+
+} // extern "C"

externals/oboe/samples/MegaDrone/src/main/java/com/google/oboe/samples/megadrone/MainActivity.java

@@ -0,0 +1,106 @@
+package com.google.oboe.samples.megadrone;
+
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.content.Context;
+import android.media.AudioManager;
+import android.os.Build;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.MotionEvent;
+
+public class MainActivity extends AppCompatActivity {
+
+    private final String TAG = MainActivity.class.toString();
+    private static long mEngineHandle = 0;
+
+    private native long startEngine(int[] cpuIds);
+    private native void stopEngine(long engineHandle);
+    private native void tap(long engineHandle, boolean isDown);
+
+    private static native void native_setDefaultStreamValues(int sampleRate, int framesPerBurst);
+
+    // Used to load the 'native-lib' library on application startup.
+    static {
+        System.loadLibrary("megadrone");
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        setDefaultStreamValues(this);
+    }
+
+    @Override
+    protected void onResume(){
+        super.onResume();
+        mEngineHandle = startEngine(getExclusiveCores());
+    }
+
+    @Override
+    protected void onPause(){
+        stopEngine(mEngineHandle);
+        super.onPause();
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+
+        if (event.getAction() == MotionEvent.ACTION_DOWN){
+            tap(mEngineHandle, true);
+        } else if (event.getAction() == MotionEvent.ACTION_UP){
+            tap(mEngineHandle, false);
+        }
+        return super.onTouchEvent(event);
+    }
+
+    // Obtain CPU cores which are reserved for the foreground app. The audio thread can be
+    // bound to these cores to avoids the risk of it being migrated to slower or more contended
+    // core(s).
+    private int[] getExclusiveCores(){
+        int[] exclusiveCores = {};
+
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
+            Log.w(TAG, "getExclusiveCores() not supported. Only available on API " +
+                    Build.VERSION_CODES.N + "+");
+        } else {
+            try {
+                exclusiveCores = android.os.Process.getExclusiveCores();
+            } catch (RuntimeException e){
+                Log.w(TAG, "getExclusiveCores() is not supported on this device.");
+            }
+        }
+        return exclusiveCores;
+    }
+
+    static void setDefaultStreamValues(Context context) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1){
+            AudioManager myAudioMgr = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
+            String sampleRateStr = myAudioMgr.getProperty(AudioManager.PROPERTY_OUTPUT_SAMPLE_RATE);
+            int defaultSampleRate = Integer.parseInt(sampleRateStr);
+            String framesPerBurstStr = myAudioMgr.getProperty(AudioManager.PROPERTY_OUTPUT_FRAMES_PER_BUFFER);
+            int defaultFramesPerBurst = Integer.parseInt(framesPerBurstStr);
+
+            native_setDefaultStreamValues(defaultSampleRate, defaultFramesPerBurst);
+        }
+    }
+}
+
+

externals/oboe/samples/MegaDrone/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,34 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillType="evenOdd"
+        android:pathData="M32,64C32,64 38.39,52.99 44.13,50.95C51.37,48.37 70.14,49.57 70.14,49.57L108.26,87.69L108,109.01L75.97,107.97L32,64Z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="78.5885"
+                android:endY="90.9159"
+                android:startX="48.7653"
+                android:startY="61.0927"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M66.94,46.02L66.94,46.02C72.44,50.07 76,56.61 76,64L32,64C32,56.61 35.56,50.11 40.98,46.06L36.18,41.19C35.45,40.45 35.45,39.3 36.18,38.56C36.91,37.81 38.05,37.81 38.78,38.56L44.25,44.05C47.18,42.57 50.48,41.71 54,41.71C57.48,41.71 60.78,42.57 63.68,44.05L69.11,38.56C69.84,37.81 70.98,37.81 71.71,38.56C72.44,39.3 72.44,40.45 71.71,41.19L66.94,46.02ZM62.94,56.92C64.08,56.92 65,56.01 65,54.88C65,53.76 64.08,52.85 62.94,52.85C61.8,52.85 60.88,53.76 60.88,54.88C60.88,56.01 61.8,56.92 62.94,56.92ZM45.06,56.92C46.2,56.92 47.13,56.01 47.13,54.88C47.13,53.76 46.2,52.85 45.06,52.85C43.92,52.85 43,53.76 43,54.88C43,56.01 43.92,56.92 45.06,56.92Z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>

externals/oboe/samples/MegaDrone/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#008577"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

externals/oboe/samples/MegaDrone/src/main/res/layout/activity_main.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity">
+
+    <TextView
+        android:id="@+id/sample_text"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Tap anywhere to play"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

externals/oboe/samples/MegaDrone/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

externals/oboe/samples/MegaDrone/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

externals/oboe/samples/MegaDrone/src/main/res/values/colors.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#008577</color>
+    <color name="colorPrimaryDark">#00574B</color>
+    <color name="colorAccent">#D81B60</color>
+</resources>

externals/oboe/samples/MegaDrone/src/main/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">Mega Drone</string>
+</resources>

externals/oboe/samples/MegaDrone/src/main/res/values/styles.xml

@@ -0,0 +1,11 @@
+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
+        <item name="colorAccent">@color/colorAccent</item>
+    </style>
+
+</resources>