Initial commit

What works?
- Reading files (AssetManager::loadFile)
- Rendering colored & textured rects (Renderer::addRect)
- Getting input (TouchInputEvent)

TODO
Port this to windows

.gitignore

@@ -0,0 +1,15 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

.idea/.gitignore

@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml

.idea/.name

@@ -0,0 +1 @@
+Krimi Dinner Engine

.idea/compiler.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="11" />
+  </component>
+</project>

.idea/gradle.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="testRunner" value="GRADLE" />
+        <option name="distributionType" value="DEFAULT_WRAPPED" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+            <option value="$PROJECT_DIR$/app" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

.idea/misc.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="Android Studio default JDK" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+</project>

app/.gitignore

@@ -0,0 +1 @@
+/build

app/build.gradle

@@ -0,0 +1,69 @@
+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdk 32
+
+    defaultConfig {
+        applicationId "tech.recreational.kde"
+        minSdk 26
+        targetSdk 32
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        externalNativeBuild {
+            cmake {
+                arguments "-DANDROID_STL=c++_static"
+                cppFlags ''
+            }
+        }
+
+        ndk {
+            // Skip deprecated ABIs. Only required when using NDK 16 or earlier.
+            abiFilters 'armeabi-v7a', 'arm64-v8a', 'x86', 'x86_64'
+        }
+    }
+
+    buildFeatures {
+        prefab true
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+            externalNativeBuild {
+                cmake {
+                    arguments "-DANDROID_STL=c++_shared"
+                }
+            }
+        }
+        debug {
+            externalNativeBuild {
+                minifyEnabled = false
+                proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+                cmake {
+                    arguments "-DANDROID_STL=c++_shared"
+                }
+            }
+        }
+    }
+    externalNativeBuild {
+        cmake {
+            path file('src/main/cpp/CMakeLists.txt')
+            version '3.18.1'
+        }
+    }
+}
+
+dependencies {
+    implementation 'androidx.games:games-activity:1.2.1'
+    implementation 'androidx.games:games-frame-pacing:1.10.1'
+    implementation 'androidx.appcompat:appcompat:1.3.0'
+    implementation 'com.google.android.material:material:1.4.0'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+}

app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# 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

app/src/androidTest/java/tech/recreational/kde/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package tech.recreational.kde;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("tech.recreational.kde", appContext.getPackageName());
+    }
+}

app/src/main/AndroidManifest.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="tech.recreational.kde">
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Application.Fullscreen"
+        tools:targetApi="31">
+        <meta-data
+            android:name="android.app.lib_name"
+            android:value="kde" />
+
+
+        <activity android:name=".KDEActivity" android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/cpp/AssetManager.cpp

@@ -0,0 +1,68 @@
+#include "AssetManager.h"
+#include "Log.h"
+
+#include <game-activity/native_app_glue/android_native_app_glue.h>
+
+#define STBI_NO_STDIO
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+
+AssetManager* AssetManager::ptr = nullptr;
+
+AssetManager::AssetManager() : m_asset_mgr(nullptr) {};
+AssetManager::~AssetManager() {}
+
+void AssetManager::create(AAssetManager *android_asset_manager)
+{
+    AssetManager::ptr = new AssetManager;
+    AssetManager::ptr->m_asset_mgr = android_asset_manager;
+}
+
+bool AssetManager::loadFile(const char* path, FileBuffer* p_file_buffer)
+{
+    AAsset* asset = AAssetManager_open(m_asset_mgr, path, AASSET_MODE_BUFFER);
+    if (!asset) {
+        ALOGE("Failed to open asset %s", path);
+        return false;
+    }
+    const void* buffer = AAsset_getBuffer(asset);
+    if (!buffer) {
+        ALOGE("Failed to retrieve contents of asset %s", path);
+        return false;
+    }
+    auto length = static_cast<size_t>(AAsset_getLength64(asset));
+    p_file_buffer->data = buffer,
+    p_file_buffer->size = length;
+    p_file_buffer->internal = asset;
+    return true;
+}
+
+bool AssetManager::loadTexture(const char* path, Texture* p_texture)
+{
+    FileBuffer texture_data = {};
+    if (!loadFile(path, &texture_data))
+        return false;
+
+    int width, height, channels;
+    const auto* raw_data = reinterpret_cast<const stbi_uc*>(texture_data.data);
+    stbi_uc* data = stbi_load_from_memory(raw_data,
+                          static_cast<int>(texture_data.size),
+                          &width, &height, &channels,
+                          4);
+    if (!data) {
+        ALOGE("Failed to parse texture file %s", path);
+        releaseFileBuffer(texture_data);
+        return false;
+    }
+    *p_texture = Texture(width, height, data);
+
+    return true;
+}
+
+void AssetManager::releaseFileBuffer(FileBuffer &fb)
+{
+    AAsset_close(reinterpret_cast<AAsset*>(fb.internal));
+    fb.internal = nullptr;
+    fb.data = nullptr;
+    fb.size = 0;
+}

app/src/main/cpp/AssetManager.h

@@ -0,0 +1,40 @@
+#ifndef KRIMI_DINNER_ENGINE_ASSETMANAGER_H
+#define KRIMI_DINNER_ENGINE_ASSETMANAGER_H
+
+#include "Texture.h"
+#include "Renderer.h"
+
+struct AAssetManager;
+
+struct FileBuffer
+{
+    const void* data;
+    size_t size;
+
+    void* internal;
+};
+
+class AssetManager {
+public:
+    static AssetManager* ptr;
+
+    static void create(AAssetManager* android_asset_manager);
+
+    bool loadFile(const char* path, FileBuffer* p_file_buffer);
+
+    bool loadTexture(const char* path, Texture* p_texture);
+
+    void releaseFileBuffer(FileBuffer& fb);
+
+private:
+    AssetManager();
+    ~AssetManager();
+
+    AssetManager(const AssetManager&) = delete;
+    AssetManager& operator=(const AssetManager&) = delete;
+
+    AAssetManager* m_asset_mgr;
+};
+
+
+#endif

app/src/main/cpp/CMakeLists.txt

@@ -0,0 +1,27 @@
+cmake_minimum_required(VERSION 3.18.1)
+project("kde")
+
+find_library(log-lib log )
+find_package(game-activity REQUIRED CONFIG)
+find_package(games-frame-pacing REQUIRED CONFIG)
+
+add_library(kde SHARED
+        kde.cpp
+        NativeEngine.cpp
+        NativeEngine.h
+        Renderer.cpp
+        Renderer.h
+        Texture.cpp
+        Texture.h
+        AssetManager.cpp
+        AssetManager.h
+        StringRepository.h
+        StringRepository.cpp
+        Hash.h
+        Hash.cpp)
+target_link_libraries(kde ${log-lib}
+        EGL
+        GLESv3
+        android
+        game-activity::game-activity
+        games-frame-pacing::swappy_static)

app/src/main/cpp/Hash.cpp

@@ -0,0 +1,152 @@
+#include "Hash.h"
+#include <stdlib.h>
+#include <string.h>
+
+Hash::Hash()
+    : m_bucket_count(0),
+      m_used_buckets(0),
+      m_keys(nullptr),
+      m_values(nullptr)
+{
+}
+
+Hash::Hash(uint32_t bucket_count)
+    : m_bucket_count(0),
+      m_used_buckets(0),
+      m_keys(nullptr),
+      m_values(nullptr)
+{
+    auto* mem = reinterpret_cast<uint64_t*>(malloc(sizeof(uint64_t) * 2 * bucket_count));
+    if (!mem)
+        return;
+    m_bucket_count = bucket_count;
+    m_keys = mem;
+    m_values = mem + bucket_count;
+    memset(mem, 0, sizeof(uint64_t) * 2 * bucket_count);
+}
+
+Hash::Hash(const Hash& copy)
+    : m_bucket_count(copy.m_bucket_count),
+      m_used_buckets(copy.m_used_buckets),
+      m_keys(nullptr),
+      m_values(nullptr)
+{
+    auto* mem = reinterpret_cast<uint64_t*>(malloc(sizeof(uint64_t) * 2 * m_bucket_count));
+    if (!mem)
+        return;
+    m_keys = mem;
+    m_values = mem + m_bucket_count;
+    memcpy(m_keys, copy.m_keys, sizeof(uint64_t) * 2 * m_bucket_count);
+}
+
+Hash& Hash::operator=(const Hash& rhs)
+{
+    if (m_keys)
+        free(m_keys);
+    m_bucket_count = rhs.m_bucket_count;
+    m_used_buckets = rhs.m_used_buckets;
+    auto* mem = reinterpret_cast<uint64_t*>(malloc(sizeof(uint64_t) * 2 * m_bucket_count));
+    if (!mem) {
+        m_bucket_count = 0;
+        m_keys = nullptr;
+        m_values = nullptr;
+        return *this;
+    }
+    m_keys = mem;
+    m_values = mem + m_bucket_count;
+    memcpy(m_keys, rhs.m_keys, sizeof(uint64_t) * 2 * m_bucket_count);
+    return *this;
+}
+
+Hash::~Hash()
+{
+    free(m_keys);
+    m_used_buckets = 0;
+    m_bucket_count = 0;
+    m_keys = nullptr;
+    m_values = nullptr;
+}
+
+uint64_t Hash::lookup(uint64_t key, uint64_t default_value)
+{
+    if (m_bucket_count == 0)
+        return default_value;
+    uint64_t i = key % m_bucket_count;
+    do {
+        if (m_keys[i] == key)
+            return m_values[i];
+        else if (m_keys[i] == HASH_EMPTY_KEY)
+            return default_value;
+        i = (i + 1) % m_bucket_count;
+    } while (i != key % m_bucket_count);
+    return default_value;
+}
+
+bool Hash::insert(uint64_t key, uint64_t value)
+{
+    if (key == HASH_EMPTY_KEY || key == HASH_TOMBSTONE_KEY) {
+        return false;
+    }
+
+    // Resize if necessary
+    float usage = static_cast<float>(m_used_buckets) / static_cast<float>(m_bucket_count);
+    if (m_bucket_count == 0 || usage > .5f) {
+        uint32_t new_cap = (m_bucket_count > 0) ? m_bucket_count * 2 : 128;
+        auto* new_mem = reinterpret_cast<uint64_t*>(malloc(sizeof(uint64_t) * new_cap * 2));
+        if (!new_mem)
+            return false;
+        uint64_t* new_keys = new_mem;
+        uint64_t* new_values = new_keys + new_cap;
+        memset(new_keys, HASH_EMPTY_KEY, sizeof(uint64_t) * new_cap);
+
+        // Re-insert all values
+        for (uint32_t i = 0; i < m_bucket_count; ++i) {
+            if (m_keys[i] != HASH_EMPTY_KEY) {
+                uint64_t idx = m_keys[i] % new_cap;
+                while (true) {
+                    if (new_keys[idx] == HASH_EMPTY_KEY) {
+                        new_keys[idx] = m_keys[i];
+                        new_values[idx] = m_values[i];
+                        break;
+                    }
+                    idx = (idx + 1) % new_cap;
+                }
+            }
+        }
+        free(m_keys);
+        m_keys = new_keys;
+        m_values = new_values;
+        m_bucket_count = new_cap;
+    }
+
+    uint64_t i = key % m_bucket_count;
+    do {
+        if (m_keys[i] == HASH_EMPTY_KEY || m_keys[i] == HASH_TOMBSTONE_KEY) {
+            m_keys[i] = key;
+            m_values[i] = value;
+            ++m_used_buckets;
+            return true;
+        }
+        else if (m_keys[i] == key) {
+            m_values[i] = value;
+            return true;
+        }
+        i = (i + 1) % m_bucket_count;
+    } while (i != (key % m_bucket_count));
+    return false;
+}
+
+void Hash::remove(uint64_t key)
+{
+    if (m_bucket_count == 0)
+        return;
+    uint64_t i = key % m_bucket_count;
+    do {
+        if (m_keys[i] == key) {
+            m_keys[i] = HASH_TOMBSTONE_KEY;
+        }
+        else if (m_keys[i] == HASH_EMPTY_KEY) {
+            break;
+        }
+    } while (i != key % m_bucket_count);
+}

app/src/main/cpp/Hash.h

@@ -0,0 +1,33 @@
+#ifndef KRIMI_DINNER_ENGINE_HASH_H
+#define KRIMI_DINNER_ENGINE_HASH_H
+
+#include <stdint.h>
+
+static constexpr uint64_t HASH_EMPTY_KEY = 0;
+static constexpr uint64_t HASH_TOMBSTONE_KEY = 1;
+
+class Hash
+{
+public:
+    Hash();
+    Hash(uint32_t bucket_count);
+    Hash(const Hash& copy);
+    Hash& operator=(const Hash& rhs);
+    ~Hash();
+
+    uint64_t lookup(uint64_t key, uint64_t default_value);
+
+    bool insert(uint64_t key, uint64_t value);
+
+    void remove(uint64_t key);
+
+private:
+    uint32_t m_bucket_count;
+    uint32_t m_used_buckets;
+    uint64_t* m_keys;
+    uint64_t* m_values;
+};
+
+using nt_hash = Hash;
+
+#endif

app/src/main/cpp/Log.h

@@ -0,0 +1,17 @@
+#ifndef KRIMI_DINNER_ENGINE_LOG_H
+#define KRIMI_DINNER_ENGINE_LOG_H
+
+#include <android/log.h>
+
+#define LOG_TAG "KrimiDinnerEngine"
+
+#define ALOGE(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__);
+#define ALOGW(...) __android_log_print(ANDROID_LOG_WARN, LOG_TAG, __VA_ARGS__);
+#define ALOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__);
+#ifdef NDEBUG
+#define ALOGV(...)
+#else
+#define ALOGV(...) __android_log_print(ANDROID_LOG_VERBOSE, LOG_TAG, __VA_ARGS__);
+#endif
+
+#endif //KRIMI_DINNER_ENGINE_LOG_H

app/src/main/cpp/NativeEngine.cpp

@@ -0,0 +1,410 @@
+//
+// Created by kevin on 02.10.2022.
+//
+
+#include "NativeEngine.h"
+#include "Log.h"
+#include "AssetManager.h"
+#include "Renderer.h"
+#include "TouchInput.h"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <swappy/swappyGL.h>
+#include <GLES3/gl3.h>
+
+static NativeEngineState g_app_state = { false };
+
+static void _handle_cmd_proxy(struct android_app* app, int32_t cmd)
+{
+    auto* engine = reinterpret_cast<NativeEngine*>(app->userData);
+    engine->handleAppCmd(cmd);
+}
+
+NativeEngine::NativeEngine(struct android_app *app)
+        : m_app(app),
+        m_egl_display(EGL_NO_DISPLAY),
+        m_egl_surface(EGL_NO_SURFACE),
+        m_egl_context(EGL_NO_CONTEXT),
+        m_jni_env(nullptr),
+        m_has_focus(false),
+        m_has_window(false),
+        m_is_visible(false),
+        m_in_motion(false)
+{
+    SwappyGL_init(getJniEnv(), m_app->activity->javaGameActivity);
+    SwappyGL_setSwapIntervalNS(SWAPPY_SWAP_20FPS);
+
+    android_app_set_key_event_filter(m_app, NULL);
+    android_app_set_motion_event_filter(m_app, NULL);
+
+    AssetManager::create(m_app->activity->assetManager);
+
+    m_smiley = StringRepository::global->internString("smiley_PNG42.png");
+    m_smiley_pos = { 100, 100 };
+}
+
+NativeEngine::~NativeEngine()
+{
+    ALOGI("NativeEngine: destructor");
+    SwappyGL_destroy();
+    killContext();
+    if (m_jni_env) {
+        m_app->activity->vm->DetachCurrentThread();
+    }
+}
+
+void NativeEngine::gameLoop()
+{
+    m_app->userData = this;
+    m_app->onAppCmd = _handle_cmd_proxy;
+    m_app->textInputState = 0;
+
+    while (true) {
+        int events;
+        struct android_poll_source* source;
+
+        // Poll commands
+        while ((ALooper_pollAll(isAnimating() ? 0 : -1, nullptr,
+                                &events, reinterpret_cast<void**>(&source))) >= 0) {
+            if (source)
+                source->process(source->app, source);
+            if (m_app->destroyRequested)
+                return;
+        }
+
+        constexpr int MAX_INPUT_EVENTS = 16;
+        TouchInputEvent input_events[MAX_INPUT_EVENTS];
+        int input_event_count = 0;
+
+        // Handle input
+        android_input_buffer* input_buffer = android_app_swap_input_buffers(m_app);
+        if (input_buffer) {
+            if (input_buffer->keyEventsCount > 0) {
+                android_app_clear_key_events(input_buffer);
+            }
+            if (input_buffer->motionEventsCount > 0) {
+                for (unsigned int i = 0; i < input_buffer->motionEventsCount; ++i) {
+                    GameActivityMotionEvent motion_event = input_buffer->motionEvents[i];
+                    if (motion_event.action == AMOTION_EVENT_ACTION_DOWN) {
+                        if (motion_event.pointerCount > 0) {
+                            GameActivityPointerAxes pointer = motion_event.pointers[0];
+                            float x = GameActivityPointerAxes_getX(&pointer);
+                            float y = GameActivityPointerAxes_getY(&pointer);
+
+                            // Record this motion
+                            m_in_motion = true;
+                            m_last_down.x = x;
+                            m_last_down.y = y;
+                        }
+                    }
+                    else if (motion_event.action == AMOTION_EVENT_ACTION_UP) {
+                        if (!m_in_motion) {
+                            ALOGW("Got an UP motion without a corresponding DOWN motion");
+                            continue;
+                        }
+
+                        if (motion_event.pointerCount > 0) {
+                            GameActivityPointerAxes pointer = motion_event.pointers[0];
+                            float x = GameActivityPointerAxes_getX(&pointer);
+                            float y = GameActivityPointerAxes_getY(&pointer);
+
+                            float dist = sqrtf((x - m_last_down.x) * (x - m_last_down.x) +
+                                    (y - m_last_down.y) * (y - m_last_down.y));
+
+                            if (dist < 5.f) {
+                                // TAP
+                                ALOGI("TAP at %f %f", x, y);
+                                input_events[input_event_count].kind = TouchInputEventKind::Tap;
+                                input_events[input_event_count].start = { x, y };
+                                input_events[input_event_count].end = { x, y };
+                                ++input_event_count;
+                            }
+                            else {
+                                // Swipe
+                                ALOGI("Swipe from %f %f to %f %f",
+                                      m_last_down.x, m_last_down.y,
+                                      x, y);
+                                input_events[input_event_count].kind = TouchInputEventKind::Tap;
+                                input_events[input_event_count].start = { m_last_down.x, m_last_down.y };
+                                input_events[input_event_count].end = { x, y };
+                                ++input_event_count;
+                            }
+                            m_in_motion = false;
+                            if (input_event_count == MAX_INPUT_EVENTS)
+                                break;
+                        }
+                    }
+                    else if (motion_event.action == AMOTION_EVENT_ACTION_CANCEL) {
+                        m_in_motion = false;
+                    }
+                }
+                android_app_clear_motion_events(input_buffer);
+            }
+        }
+
+        if (isAnimating() && Renderer::ptr) {
+            static float x = 1.f;
+            static float d = -0.01f;
+            x += d;
+            if ( x <= 0.f)
+                d *= -1.f;
+            else if (x >= 1.f)
+                d *= -1.f;
+
+
+            if (input_event_count > 0) {
+                m_smiley_pos = input_events[input_event_count - 1].end;
+                m_smiley_pos.x -= 250;
+                m_smiley_pos.y -= 250;
+            }
+
+            Renderer::ptr->addRect(100, 100, 500, 500, 0.3f, 0.3f, 0.3f, 1.f);
+            Renderer::ptr->addRect(m_smiley_pos.x, m_smiley_pos.y, 500, 500, 0.f, x*x, 1.f - x*x, 1.f, m_smiley);
+        }
+
+        if (isAnimating()) {
+            renderFrame();
+        }
+    }
+}
+
+bool NativeEngine::isAnimating() const
+{
+    return m_has_window && m_has_focus && m_is_visible;
+}
+
+
+void NativeEngine::handleAppCmd(int32_t cmd)
+{
+    ALOGV("NativeEngine: Handling command %d.", cmd);
+    switch (cmd) {
+        case APP_CMD_SAVE_STATE:
+            break;
+        case APP_CMD_INIT_WINDOW:
+            ALOGV("NativeEngine:: APP_CMD_INIT_WINDOW");
+            if (m_app->window) {
+                m_has_window = true;
+                SwappyGL_setWindow(m_app->window);
+                if (m_app->savedStateSize == sizeof(m_state) && m_app->savedState) {
+                    m_state = *reinterpret_cast<NativeEngineState*>(m_app->savedState);
+                    m_has_focus = m_state.has_focus;
+                }
+                else {
+                    // Workaround APP_CMD_GAINED_FOCUS issue where the focus state is not passed
+                    // down from GameActivity when restarting Activity
+                    m_has_focus = g_app_state.has_focus;
+                }
+            }
+            ALOGV("HandleCommand(%d): hasWindow = %d, hasFocus = %d", cmd,
+                  m_has_window ? 1 : 0, m_has_focus ? 1 : 0);
+            break;
+        case APP_CMD_TERM_WINDOW:
+            ALOGV("NativeEngine: APP_CMD_TERM_WINDOW");
+            killSurface();
+            m_has_window = false;
+            break;
+        case APP_CMD_GAINED_FOCUS:
+            ALOGV("NativeEngine: APP_CMD_GAINED_FOCUS");
+            m_has_focus = true;
+            m_state.has_focus = g_app_state.has_focus = m_has_focus;
+            break;
+        case APP_CMD_LOST_FOCUS:
+            ALOGV("NativeEngine: APP_CMD_LOST_FOCUS");
+            m_has_focus = false;
+            m_state.has_focus = g_app_state.has_focus = m_has_focus;
+            break;
+        case APP_CMD_START:
+            ALOGV("NativeEngine: APP_CMD_START");
+            m_is_visible = true;
+            break;
+        case APP_CMD_STOP:
+            ALOGV("NativeEngine: APP_CMD_STOP");
+            m_is_visible = false;
+            break;
+        default:
+            ALOGW("Unhandled command.");
+            break;
+    }
+    ALOGV("NativeEngine STATUS: F%d, V%d, W%d, EGL: D %p, S %p, CTX %p, CFG %p",
+          m_has_focus, m_is_visible, m_has_window, m_egl_display, m_egl_surface, m_egl_context,
+          m_egl_config);
+}
+
+JNIEnv* NativeEngine::getJniEnv()
+{
+    if (!m_jni_env) {
+        if (m_app->activity->vm->AttachCurrentThread(&m_jni_env, nullptr) != 0) {
+            ALOGE("*** FATAL ERROR: failed to attach thread to JNI.");
+            exit(1);
+        }
+        ALOGI("Attached current thread to JNI, %p", m_jni_env);
+    }
+    return m_jni_env;
+}
+
+bool NativeEngine::prepareToRender()
+{
+    if (m_egl_display == EGL_NO_DISPLAY || m_egl_surface == EGL_NO_SURFACE || m_egl_context == EGL_NO_CONTEXT) {
+        if (!initDisplay()) {
+            ALOGE("NativeEngine: failed to create display");
+            return false;
+        }
+
+        if (!initSurface()) {
+            ALOGE("NativeEngine: failed to create surface.");
+            return false;
+        }
+
+        if (!initContext()) {
+            ALOGE("NativeEngine: failed to create context.");
+            return false;
+        }
+
+        ALOGI("NativeEngine: binding surface and context (display %p, surface %p, context %p)",
+              m_egl_display, m_egl_surface, m_egl_context);
+
+        if (eglMakeCurrent(m_egl_display, m_egl_surface, m_egl_surface, m_egl_context) == EGL_FALSE) {
+            ALOGE("NativeEngine: eglMakeCurrent failed, EGL error: %d", eglGetError());
+            return false;
+        }
+
+        initGLObjects();
+    }
+    return true;
+}
+
+bool NativeEngine::initDisplay()
+{
+    if (m_egl_display != EGL_NO_DISPLAY) {
+        return true;
+    }
+
+    ALOGI("NativeEngine: Initializing display");
+    m_egl_display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+    if (eglInitialize(m_egl_display, 0, 0) == EGL_FALSE) {
+        ALOGE("NativeEngine: Failed to init display, error %d", eglGetError());
+        return false;
+    }
+    return true;
+}
+
+void NativeEngine::killDisplay()
+{
+    ALOGI("NativeEngine: Killing display");
+    killContext();
+    killSurface();
+
+    if (m_egl_display != EGL_NO_DISPLAY) {
+        eglTerminate(m_egl_display);
+        m_egl_display = EGL_NO_DISPLAY;
+    }
+}
+
+bool NativeEngine::initSurface()
+{
+    assert(m_egl_display != EGL_NO_DISPLAY);
+    if (m_egl_surface != EGL_NO_SURFACE) {
+        return true;
+    }
+
+    ALOGI("NativeEngine: initializing surface");
+
+    EGLint num_configs;
+    const EGLint attribs[] = {
+            EGL_RENDERABLE_TYPE, EGL_OPENGL_ES3_BIT,
+            EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
+            EGL_BLUE_SIZE, 8,
+            EGL_GREEN_SIZE, 8,
+            EGL_RED_SIZE, 8,
+            EGL_DEPTH_SIZE, 16,
+            EGL_NONE,
+    };
+    eglChooseConfig(m_egl_display, attribs, &m_egl_config, 1, &num_configs);
+
+    m_egl_surface = eglCreateWindowSurface(m_egl_display, m_egl_config, m_app->window, nullptr);
+    if (m_egl_surface == EGL_NO_SURFACE) {
+        ALOGE("Failed to create EGL surface. EGL error: %d", eglGetError());
+        return false;
+    }
+    return true;
+}
+
+void NativeEngine::killSurface()
+{
+    ALOGI("NativeEngine: Killing surface.");
+    eglMakeCurrent(m_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+    if (m_egl_surface != EGL_NO_SURFACE) {
+        eglDestroySurface(m_egl_display, m_egl_surface);
+        m_egl_surface = EGL_NO_SURFACE;
+    }
+}
+
+bool NativeEngine::initContext()
+{
+    ALOGI("NativeEngine: initializing context");
+    assert(m_egl_display != EGL_NO_DISPLAY);
+
+    EGLint attrib_list[] = {
+            EGL_CONTEXT_CLIENT_VERSION, 3,
+            EGL_NONE
+    };
+
+    if (m_egl_context != EGL_NO_CONTEXT)
+        return true;
+
+    m_egl_context = eglCreateContext(m_egl_display, m_egl_config, nullptr, attrib_list);
+    if (m_egl_context == EGL_NO_CONTEXT) {
+        ALOGE("Failed to create EGL context, egl error: %d", eglGetError());
+        return false;
+    }
+    return true;
+}
+
+void NativeEngine::killContext()
+{
+    ALOGI("NativeEngine: Killing context");
+
+    killGLObjects();
+
+    eglMakeCurrent(m_egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+    if (m_egl_context != EGL_NO_CONTEXT) {
+        eglDestroyContext(m_egl_display, m_egl_context);
+        m_egl_context = EGL_NO_CONTEXT;
+    }
+}
+
+bool NativeEngine::initGLObjects()
+{
+    if (Renderer::ptr) {
+        return true;
+    }
+    Renderer::create();
+
+    return true;
+}
+
+void NativeEngine::killGLObjects()
+{
+    if (Renderer::ptr) {
+        Renderer::destroy();
+    }
+}
+
+void NativeEngine::renderFrame()
+{
+    if (!prepareToRender()) {
+        ALOGE("NativeEngine: preparation to render failed");
+        return;
+    }
+
+    int width, height;
+    eglQuerySurface(m_egl_display, m_egl_surface, EGL_WIDTH, &width);
+    eglQuerySurface(m_egl_display, m_egl_surface, EGL_HEIGHT, &height);
+
+    Renderer::ptr->renderFrame(static_cast<float>(width), static_cast<float>(height));
+
+    if (!SwappyGL_swap(m_egl_display, m_egl_surface)) {
+        ALOGW("NativeEngine: SwappyGL_swap failed, EGL error %d", eglGetError());
+    }
+}

app/src/main/cpp/NativeEngine.h

@@ -0,0 +1,65 @@
+#ifndef KRIMI_DINNER_ENGINE_NATIVEENGINE_H
+#define KRIMI_DINNER_ENGINE_NATIVEENGINE_H
+
+#include "Position.h"
+#include "StringRepository.h"
+
+#include <game-activity/native_app_glue/android_native_app_glue.h>
+#include <EGL/egl.h>
+
+struct NativeEngineState
+{
+    bool has_focus;
+};
+
+class NativeEngine {
+public:
+    NativeEngine(struct android_app* app);
+    ~NativeEngine();
+
+    void gameLoop();
+
+    void handleAppCmd(int32_t event);
+
+private:
+    bool isAnimating() const;
+
+    JNIEnv* getJniEnv();
+
+    bool prepareToRender();
+    void renderFrame();
+
+    bool initDisplay();
+    void killDisplay();
+    bool initSurface();
+    void killSurface();
+    bool initContext();
+    void killContext();
+
+    bool initGLObjects();
+    void killGLObjects();
+
+    struct android_app* m_app;
+
+    bool m_has_window;
+    bool m_has_focus;
+    bool m_is_visible;
+
+    NativeEngineState m_state;
+
+    EGLDisplay m_egl_display;
+    EGLSurface m_egl_surface;
+    EGLContext m_egl_context;
+    EGLConfig m_egl_config;
+
+    StringHandle m_smiley;
+    Position m_smiley_pos;
+
+    Position m_last_down;
+    bool m_in_motion;
+
+    JNIEnv* m_jni_env;
+};
+
+
+#endif

app/src/main/cpp/Position.h

@@ -0,0 +1,10 @@
+#ifndef KRIMI_DINNER_ENGINE_POSITION_H
+#define KRIMI_DINNER_ENGINE_POSITION_H
+
+struct Position
+{
+    float x;
+    float y;
+};
+
+#endif //KRIMI_DINNER_ENGINE_POSITION_H

app/src/main/cpp/Renderer.cpp

@@ -0,0 +1,258 @@
+#include "Renderer.h"
+#include "Log.h"
+#include "AssetManager.h"
+
+Renderer* Renderer::ptr = nullptr;
+
+static const char* g_vert_src =
+"#version 300 es                                                                   \n"
+"precision mediump float;                                                          \n"
+"uniform vec2 res; // resolution                                                   \n"
+"layout (location = 0) in vec2 v_p0;   // top left corner on screen                \n"
+"layout (location = 1) in vec2 v_p1;   // top right corner on screen               \n"
+"layout (location = 2) in vec2 v_src_p0;                                           \n"
+"layout (location = 3) in vec2 v_src_p1;                                           \n"
+"layout (location = 4) in vec4 v_color;    // color                                \n"
+"out vec4 f_color;                                                                 \n"
+"out vec2 f_uv;                                                                    \n"
+"const vec2 vertices[6] = vec2[6](                                                 \n"
+"        vec2(-1,-1),                                                              \n"
+"        vec2(+1, -1),                                                             \n"
+"        vec2(-1, +1),                                                             \n"
+"        vec2(+1, -1),                                                             \n"
+"        vec2(+1, +1),                                                             \n"
+"        vec2(-1, +1)                                                              \n"
+");                                                                                \n"
+"void main()                                                                       \n"
+"{                                                                                 \n"
+"    vec2 v = vertices[gl_VertexID];                                               \n"
+"    // destination on screen                                                      \n"
+"    //vec2 dst_half_size = (v_p1 - v_p0) / 2.0;                                   \n"
+"    //vec2 dst_center = (v_p1 + v_p0) / 2.0;                                      \n"
+"    vec2 dst_pos = v * ((v_p1 - v_p0) / 2.0) + ((v_p1 + v_p0) / 2.0);             \n"
+"    dst_pos.y = res.y - dst_pos.y;                                                \n"
+"    vec2 src = v * ((v_src_p1 - v_src_p0) / 2.0) + ((v_src_p1 + v_src_p0) / 2.0); \n"
+"    gl_Position = vec4(2.0 * dst_pos.x / res.x - 1.0,                             \n"
+"                       2.0 * dst_pos.y / res.y - 1.0,                             \n"
+"                       0.0,                                                       \n"
+"                       1.0);                                                      \n"
+"    f_color = v_color;                                                            \n"
+"    f_uv = src;                                                                   \n"
+"}                                                                                 \n";
+
+static const char* g_frag_src =
+"#version 300 es                                      \n"
+"precision mediump float;                             \n"
+"in vec2 f_uv;                                        \n"
+"in vec4 f_color;                                     \n"
+"layout (location = 0) out vec4 frag_color;           \n"
+"uniform sampler2D s_texture;                         \n"
+"void main()                                          \n"
+"{                                                    \n"
+"    vec4 tex_color = texture(s_texture, f_uv);       \n"
+"    frag_color = tex_color * f_color;                \n"
+"}                                                    \n";
+
+void Renderer::create()
+{
+    Renderer::ptr = new Renderer;
+}
+
+void Renderer::destroy()
+{
+    delete Renderer::ptr;
+    Renderer::ptr = nullptr;
+}
+
+Renderer::Renderer()
+{
+    GLuint vertex = 0, fragment = 0;
+    vertex = glCreateShader(GL_VERTEX_SHADER);
+    glShaderSource(vertex, 1, &g_vert_src, nullptr);
+    glCompileShader(vertex);
+    int status = 0;
+    glGetShaderiv(vertex, GL_COMPILE_STATUS, &status);
+    if (status != GL_TRUE) {
+        char info[512];
+        glGetShaderInfoLog(vertex, 512, nullptr, info);
+        ALOGE("Failed to compile ui vertex shader: %s", info);
+    }
+
+
+    fragment = glCreateShader(GL_FRAGMENT_SHADER);
+    glShaderSource(fragment, 1, &g_frag_src, nullptr);
+    glCompileShader(fragment);
+    glGetShaderiv(fragment, GL_COMPILE_STATUS, &status);
+    if (status != GL_TRUE) {
+        char info[512];
+        glGetShaderInfoLog(fragment, 512, nullptr, info);
+        ALOGE("Failed to compile ui fragment shader: %s", info);
+    }
+
+    m_shader = glCreateProgram();
+    glAttachShader(m_shader, vertex);
+    glAttachShader(m_shader, fragment);
+    glLinkProgram(m_shader);
+    glGetProgramiv(m_shader, GL_LINK_STATUS, &status);
+    if (status != GL_TRUE) {
+        char info[512];
+        glGetProgramInfoLog(m_shader, 512, nullptr, info);
+        ALOGE("Failed to link ui shader: %s", info);
+    }
+
+    glDeleteShader(vertex);
+    glDeleteShader(fragment);
+
+    glGenBuffers(1, &m_vbo);
+    glGenVertexArrays(1, &m_vao);
+    glBindVertexArray(m_vao);
+    glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
+
+    glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(Rect), (GLvoid*)0);
+    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(Rect), (GLvoid*)(2 * sizeof(float)));
+    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Rect), (GLvoid*)(4 * sizeof(float)));
+    glVertexAttribPointer(3, 2, GL_FLOAT, GL_FALSE, sizeof(Rect), (GLvoid*)(6 * sizeof(float)));
+    glVertexAttribPointer(4, 4, GL_FLOAT, GL_FALSE, sizeof(Rect), (GLvoid*)(8 * sizeof(float)));
+    glEnableVertexAttribArray(0);
+    glEnableVertexAttribArray(1);
+    glEnableVertexAttribArray(2);
+    glEnableVertexAttribArray(3);
+    glEnableVertexAttribArray(4);
+    glVertexAttribDivisor(0, 1);
+    glVertexAttribDivisor(1, 1);
+    glVertexAttribDivisor(2, 1);
+    glVertexAttribDivisor(3, 1);
+    glVertexAttribDivisor(4, 1);
+    glBindVertexArray(0);
+
+    // Dummy texture (1x1px white)
+    unsigned char tex[] = { 255, 255, 255, 255 };
+    Texture dummy_texture(1, 1, tex);
+    m_textures.insert(std::make_pair(0, dummy_texture));
+    m_dummy_texture = 0;
+}
+
+Renderer::~Renderer() {
+    for (auto texture : m_textures)
+        texture.second.destroy();
+    glDeleteProgram(m_shader);
+    glDeleteVertexArrays(1, &m_vao);
+    glDeleteBuffers(1, &m_vbo);
+}
+
+void Renderer::addRect(float x, float y, float w, float h)
+{
+    addRect(x, y, w, h, 1.f, 1.f, 1.f, 1.f, m_dummy_texture, 0.f, 0.f, 1.f, 1.f);
+}
+
+void Renderer::addRect(float x, float y, float w, float h, StringHandle texture)
+{
+    addRect(x, y, w, h, 1.f, 1.f, 1.f, 1.f, texture, 0.f, 0.f, 1.f, 1.f);
+}
+
+void Renderer::addRect(float x, float y, float w, float h, float r, float g, float b, float a)
+{
+    addRect(x, y, w, h, r, g, b, a, m_dummy_texture, 0.f, 0.f, 1.f, 1.f);
+}
+
+void Renderer::addRect(float x, float y, float w, float h, float r, float g, float b, float a, StringHandle texture)
+{
+    addRect(x, y, w, h, r, g, b, a, texture, 0.f, 0.f, 1.f, 1.f);
+}
+
+void Renderer::addRect(float x, float y, float w, float h, StringHandle texture, float src_x, float src_y, float src_w, float src_h)
+{
+    addRect(x, y, w, h, 1.f, 1.f, 1.f, 1.f, texture, src_x, src_y, src_w, src_h);
+}
+
+void Renderer::addRect(float x, float y, float w, float h, float r, float g, float b, float a, StringHandle texture, float src_x, float src_y, float src_w, float src_h)
+{
+    if (m_textures.find(texture) == m_textures.end()) {
+        Texture tex;
+        if (!AssetManager::ptr->loadTexture(StringRepository::global->getString(texture),
+                                            &tex)) {
+            ALOGE("Failed to load texture");
+            return;
+        }
+        m_textures.insert(std::make_pair(texture, tex));
+    }
+
+    Rect rect = {};
+    rect.dst_p0_x = x;
+    rect.dst_p0_y = y;
+    rect.dst_p1_x = x + w;
+    rect.dst_p1_y = y + h;
+    rect.src_p0_x = src_x;
+    rect.src_p0_y = src_y;
+    rect.src_p1_x = src_w;
+    rect.src_p1_y = src_y + src_h;
+    rect.r = r;
+    rect.g = g;
+    rect.b = b;
+    rect.a = a;
+    m_rects.push_back(rect);
+    m_draw_textures.push_back(texture);
+}
+
+void Renderer::renderFrame(float width, float height)
+{
+    assert(m_rects.size() == m_draw_textures.size());
+
+    const auto rect_count = static_cast<GLsizei>(m_rects.size());
+    if (rect_count == 0)
+        return;
+
+    glViewport(0, 0, static_cast<int>(width), static_cast<int>(height));
+    glClearColor(0.8f, 0.3f, 0.3f, 1.f);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glDisable(GL_DEPTH_TEST);
+    glDisable(GL_CULL_FACE);
+    glEnable(GL_BLEND);
+    glBlendEquation(GL_FUNC_ADD);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+    glBindVertexArray(m_vao);
+    glUseProgram(m_shader);
+    glUniform2f(glGetUniformLocation(m_shader, "res"), width, height);
+    glUniform1i(glGetUniformLocation(m_shader, "s_texture"), 0);
+    glBindBuffer(GL_ARRAY_BUFFER, m_vbo);
+
+    size_t start = 0;
+    StringHandle current_texture = m_draw_textures[0];
+    while (start < rect_count) {
+        glActiveTexture(GL_TEXTURE0);
+        m_textures[current_texture].bind();
+        for (size_t i = start; i < rect_count; ++i) {
+            StringHandle texture = m_draw_textures[i];
+            if ((texture != current_texture)) {
+                // Draw everything in [start, i - 1]
+                const size_t count = i - start;
+                glBufferData(GL_ARRAY_BUFFER,
+                             static_cast<GLsizeiptr>(sizeof(Rect) * count), &m_rects[start],
+                             GL_STREAM_DRAW);
+                glDrawArraysInstanced(GL_TRIANGLES, 0, 6, static_cast<GLsizei>(count));
+
+                start = i;
+                current_texture = texture;
+                break;
+            }
+
+            if (i == rect_count - 1) {
+                // just draw it
+                const size_t count = rect_count - start;
+                glBufferData(GL_ARRAY_BUFFER,
+                             static_cast<GLsizeiptr>(sizeof(Rect) * count), &m_rects[start],
+                             GL_STREAM_DRAW);
+                glDrawArraysInstanced(GL_TRIANGLES, 0, 6, static_cast<GLsizei>(count));
+
+                start = rect_count;
+                current_texture = texture;
+            }
+        }
+
+
+    }
+    m_rects.clear();
+    m_draw_textures.clear();
+}

app/src/main/cpp/Renderer.h

@@ -0,0 +1,62 @@
+#ifndef KRIMI_DINNER_ENGINE_RENDERER_H
+#define KRIMI_DINNER_ENGINE_RENDERER_H
+
+#include <GLES3/gl3.h>
+#include <unordered_map>
+#include <vector>
+
+#include "Texture.h"
+#include "StringRepository.h"
+
+class Renderer
+{
+public:
+    static Renderer* ptr;
+
+    static void create();
+
+    static void destroy();
+
+    void addRect(float x, float y, float w, float h);
+
+    void addRect(float x, float y, float w, float h, StringHandle texture);
+
+    void addRect(float x, float y, float w, float h, float r, float g, float b, float a);
+
+    void addRect(float x, float y, float w, float h, float r, float g, float b, float a, StringHandle texture);
+
+    void addRect(float x, float y, float w, float h, StringHandle texture, float src_x, float src_y, float src_w, float src_h);
+
+    void addRect(float x, float y, float w, float h, float r, float g, float b, float a, StringHandle texture, float src_x, float src_y, float src_w, float src_h);
+
+    void renderFrame(float width, float height);
+
+private:
+    Renderer();
+    ~Renderer();
+
+    Renderer(const Renderer&) = delete;
+    Renderer& operator=(const Renderer&) = delete;
+
+    struct Rect {
+        float dst_p0_x, dst_p0_y;
+        float dst_p1_x, dst_p1_y;
+        float src_p0_x, src_p0_y;
+        float src_p1_x, src_p1_y;
+        float r, g, b, a;
+    };
+
+    GLuint m_shader;
+    GLuint m_vao;
+    GLuint m_vbo;
+
+    StringHandle m_dummy_texture;
+
+    std::vector<Rect> m_rects;
+    std::vector<StringHandle> m_draw_textures;
+
+    std::unordered_map<StringHandle, Texture> m_textures;
+};
+
+
+#endif

app/src/main/cpp/StringRepository.cpp

@@ -0,0 +1,84 @@
+#include "StringRepository.h"
+#include <string.h>
+#include <stdlib.h>
+
+static StringRepository g_global_repository;
+StringRepository* StringRepository::global = &g_global_repository;
+
+static uint64_t hashString(const char* string, unsigned int length)
+{
+    uint64_t hash = 0xcbf29ce484222325;
+    for (unsigned int i = 0; i < length; ++i) {
+        hash = hash ^ string[i];
+        hash = hash * 0x00000100000001B3;
+    }
+    if (hash == HASH_EMPTY_KEY || hash == HASH_TOMBSTONE_KEY)
+        hash = ~hash;
+    return hash;
+}
+
+StringRepository::StringRepository(const StringRepository& copy)
+{
+    if (m_buffer)
+        free(m_buffer);
+    m_one_past_last_char = copy.m_one_past_last_char;
+    m_buffer_size = copy.m_buffer_size;
+    m_hash = copy.m_hash;
+    m_buffer = reinterpret_cast<char*>(malloc(m_buffer_size));
+    memcpy(m_buffer, copy.m_buffer, m_buffer_size);
+}
+
+StringRepository::~StringRepository()
+{
+    m_one_past_last_char = 0;
+    m_buffer_size = 0;
+    free(m_buffer);
+}
+
+StringHandle StringRepository::internStringLength(const char* string, unsigned int length)
+{
+    uint64_t hash = hashString(string, length);
+    uint32_t offset = static_cast<uint32_t>(m_hash.lookup(hash, UINT32_MAX));
+    if (offset == UINT32_MAX) {
+        offset = m_one_past_last_char;
+        if ((offset + length + 1) >= m_buffer_size) {
+            uint32_t new_size = (m_buffer_size > 0) ? 2 * m_buffer_size : 1024;
+            void* tmp = realloc(m_buffer, new_size);
+            if (!tmp)
+                return 0;
+            m_buffer = reinterpret_cast<char*>(tmp);
+            m_buffer_size = new_size;
+        }
+        char* dest = m_buffer + offset;
+        memcpy(dest, string, length);
+        dest[length] = '\0';
+        m_one_past_last_char += length + 1;
+        if (!m_hash.insert(hash, offset))
+            return 0;
+    }
+    return static_cast<StringHandle>(offset + 1);
+}
+
+StringHandle StringRepository::internString(const char* string)
+{
+    return internStringLength(string, strlen(string));
+}
+
+const char* StringRepository::getString(StringHandle handle)
+{
+    if (handle == 0 || handle >= m_one_past_last_char)
+        return nullptr;
+    uint32_t offset = handle - 1;
+    return &m_buffer[offset];
+}
+
+void StringRepository::releaseString(StringHandle)
+{
+    // do nothing
+}
+
+void StringRepository::freeAll()
+{
+    m_one_past_last_char = 0;
+    m_hash = Hash();
+}

app/src/main/cpp/StringRepository.h

@@ -0,0 +1,39 @@
+#ifndef KRIMI_DINNER_ENGINE_STRINGREPOSITORY_H
+#define KRIMI_DINNER_ENGINE_STRINGREPOSITORY_H
+
+#include <stdint.h>
+#include "Hash.h"
+
+using StringHandle = uint32_t;
+
+// Alias for compatibility
+using nt_string_handle = StringHandle;
+
+class StringRepository
+{
+public:
+    // The default string repository
+    static StringRepository* global;
+
+    StringRepository() = default;
+    StringRepository(const StringRepository& copy);
+    ~StringRepository();
+
+    StringHandle internStringLength(const char* string, unsigned int length);
+
+    StringHandle internString(const char* string);
+
+    const char* getString(StringHandle handle);
+
+    void releaseString(StringHandle handle);
+
+    void freeAll();
+
+private:
+    uint32_t m_buffer_size;
+    uint32_t m_one_past_last_char;
+    char* m_buffer;
+    Hash m_hash;
+};
+
+#endif

app/src/main/cpp/Texture.cpp

@@ -0,0 +1,34 @@
+#include "Texture.h"
+
+Texture::Texture(unsigned int width, unsigned int height, const void *data)
+    : m_texture(0)
+{
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+    glGenTextures(1, &m_texture);
+    glBindTexture(GL_TEXTURE_2D, m_texture);
+    glTexImage2D(GL_TEXTURE_2D,
+                 0,
+                 GL_RGBA,
+                 static_cast<GLsizei>(width),
+                 static_cast<GLsizei>(height),
+                 0,
+                 GL_RGBA,
+                 GL_UNSIGNED_BYTE,
+                 data);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glGenerateMipmap(GL_TEXTURE_2D);
+    glBindTexture(GL_TEXTURE_2D, 0);
+}
+
+void Texture::destroy()
+{
+    glDeleteTextures(1, &m_texture);
+}
+
+void Texture::bind() const
+{
+    glBindTexture(GL_TEXTURE_2D, m_texture);
+}

app/src/main/cpp/Texture.h

@@ -0,0 +1,25 @@
+#ifndef KRIMI_DINNER_ENGINE_TEXTURE_H
+#define KRIMI_DINNER_ENGINE_TEXTURE_H
+
+#include <GLES3/gl3.h>
+
+class Renderer;
+
+class Texture
+{
+public:
+    Texture() : m_texture(0) {}
+    Texture(unsigned int width, unsigned int height, const void* data);
+    Texture(const Texture&) = default;
+    Texture(Texture&&) = default;
+    Texture& operator=(const Texture&) = default;
+
+    void destroy();
+
+    void bind() const;
+
+private:
+    GLuint m_texture;
+};
+
+#endif

app/src/main/cpp/TouchInput.h

@@ -0,0 +1,19 @@
+#ifndef KRIMI_DINNER_ENGINE_TOUCHINPUT_H
+#define KRIMI_DINNER_ENGINE_TOUCHINPUT_H
+
+#include "Position.h"
+
+enum class TouchInputEventKind
+{
+    Tap,
+    Swipe
+};
+
+struct TouchInputEvent
+{
+    TouchInputEventKind kind;
+    Position start;
+    Position end;
+};
+
+#endif

app/src/main/cpp/kde.cpp

@@ -0,0 +1,15 @@
+#include <game-activity/GameActivity.cpp>
+#include <game-text-input/gametextinput.cpp>
+extern "C" {
+#include <game-activity/native_app_glue/android_native_app_glue.c>
+}
+
+extern "C" { void android_main(struct android_app* app); }
+
+#include "NativeEngine.h"
+
+void android_main(struct android_app* app) {
+    auto* engine = new NativeEngine(app);
+    engine->gameLoop();
+    delete engine;
+}

app/src/main/java/tech/recreational/kde/KDEActivity.java

@@ -0,0 +1,26 @@
+package tech.recreational.kde;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowInsetsControllerCompat;
+import androidx.core.view.WindowInsetsCompat;
+
+import com.google.androidgamesdk.GameActivity;
+
+public class KDEActivity extends GameActivity {
+    static {
+        System.loadLibrary("kde");
+    }
+
+    protected void onResume() {
+        super.onResume();
+        hideSystemBars();
+    }
+
+    private void hideSystemBars() {
+        WindowInsetsControllerCompat windowInsetsController = ViewCompat.getWindowInsetsController(
+                getWindow().getDecorView());
+        if (windowInsetsController == null)
+            return;
+        windowInsetsController.setSystemBarsBehavior(WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE);
+        windowInsetsController.hide(WindowInsetsCompat.Type.systemBars());
+    }
+}

app/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,30 @@
+<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:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                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="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>

app/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="#3DDC84"
+        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>

app/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>

app/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>

app/src/main/res/values-night/themes.xml

@@ -0,0 +1,16 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.KrimiDinnerENgine" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/purple_200</item>
+        <item name="colorPrimaryVariant">@color/purple_700</item>
+        <item name="colorOnPrimary">@color/black</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/teal_200</item>
+        <item name="colorSecondaryVariant">@color/teal_200</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+    </style>
+</resources>

app/src/main/res/values/colors.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="purple_200">#FFBB86FC</color>
+    <color name="purple_500">#FF6200EE</color>
+    <color name="purple_700">#FF3700B3</color>
+    <color name="teal_200">#FF03DAC5</color>
+    <color name="teal_700">#FF018786</color>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+</resources>

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

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">Krimi Dinner Engine</string>
+</resources>

app/src/main/res/values/themes.xml

@@ -0,0 +1,7 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Application.Fullscreen" parent="Theme.AppCompat.Light.NoActionBar">
+        <item name="android:windowFullscreen">true</item>
+        <item name="android:windowContentOverlay">@null</item>
+    </style>
+</resources>

app/src/main/res/xml/backup_rules.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample backup rules file; uncomment and customize as necessary.
+   See https://developer.android.com/guide/topics/data/autobackup
+   for details.
+   Note: This file is ignored for devices older that API 31
+   See https://developer.android.com/about/versions/12/backup-restore
+-->
+<full-backup-content>
+    <!--
+   <include domain="sharedpref" path="."/>
+   <exclude domain="sharedpref" path="device.xml"/>
+-->
+</full-backup-content>

app/src/main/res/xml/data_extraction_rules.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample data extraction rules file; uncomment and customize as necessary.
+   See https://developer.android.com/about/versions/12/backup-restore#xml-changes
+   for details.
+-->
+<data-extraction-rules>
+    <cloud-backup>
+        <!-- TODO: Use <include> and <exclude> to control what is backed up.
+        <include .../>
+        <exclude .../>
+        -->
+    </cloud-backup>
+    <!--
+    <device-transfer>
+        <include .../>
+        <exclude .../>
+    </device-transfer>
+    -->
+</data-extraction-rules>

app/src/test/java/tech/recreational/kde/ExampleUnitTest.java

@@ -0,0 +1,17 @@
+package tech.recreational.kde;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() {
+        assertEquals(4, 2 + 2);
+    }
+}

build.gradle

@@ -0,0 +1,9 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+plugins {
+    id 'com.android.application' version '7.2.2' apply false
+    id 'com.android.library' version '7.2.2' apply false
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}

gradle.properties

@@ -0,0 +1,21 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app"s APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Enables namespacing of each library's R class so that its R class includes only the
+# resources declared in the library itself and none from the library's dependencies,
+# thereby reducing the size of the R class for that library
+android.nonTransitiveRClass=true

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Sun Oct 02 14:06:47 CEST 2022
+distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip
+distributionPath=wrapper/dists
+zipStorePath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME

gradlew

@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# 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
+#
+#      https://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.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1,16 @@
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        google()
+        mavenCentral()
+    }
+}
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+rootProject.name = "Krimi Dinner Engine"
+include ':app'