next version

.gitignore

@@ -31,6 +31,7 @@ build/
 trash
 .github
 .vscode
+.vs
 
 # Files from build
 **/*.o
@@ -43,4 +44,13 @@ src/-lstdc++.res
 # Neural network for the NNUE evaluation
 **/*.nnue
 
-/.vs
+flags.txt
+
+CMakeFiles
+cmake_install.cmake
+CMakeCache.txt
+web/Makefile
+
+web/experiments
+web/flutter_stockfish_plugin*
+web/stockfish_data.bin

CHANGELOG.md

@@ -1,3 +1,23 @@
+## 1.1.0
+Added Web Support, Example, Test
+- Added simple test script.
+- Changed example/example.dart to a flutter project
+- Added web support
+- more small fixes
+- Added sse4.2
+
+## 1.0.4
+Restarting bug fixed.
+- Added the ability to restart stockfish.
+
+## 1.0.3
+Perfomance Flags for Windows and Linux.
+- Activating: sse, sse2, sse3, sse4.1
+
+## 1.0.2
+Fixes for windows. This Version should run on windows.
+- Self implemented \_get\_pgmptr
+
 ## 1.0.1
 No major changes, just some metadata fixes.
 

README.md

@@ -28,6 +28,32 @@ stockfish.dispose();
 
 A complete Example can be found at [stockfish_chess_engine](https://github.com/loloof64/StockfishChessEngineFlutter).
 
+## Web support
+Web support is currently experimental and requires manuly adding assets. It uses a version of stockfish compiled with [emscripten](https://emscripten.org/).
+
+Usage:
+- Install `emscripten` and set the the Environment-Variable `EMSDK`
+- Build the CMakeLists.txt in `web/`
+- Copy the following files to `web/stockfish/` in your project: 
+  - flutter_stockfish_plugin.js
+  - flutter_stockfish_plugin.wasm
+  - flutter_stockfish_plugin.worker.js
+  - js_bindings.js
+  - stockfish_data.bin
+
+If a different path should be used: Change the path const's in `js_bindungs.js` and `stockfish_web_bindings.dart`
+
+In order to make multithreading available, the site must run in a secure environment. 
+The following headers must be set for this:
+
+- `Cross-Origin-Embedder-Policy: require-corp`
+- `Cross-Origin-Opener-Policy: same-origin`
+
+Problems:
+- The current version does not include the `.js`, `.wasm` and neuralnetwork data as assets. 
+This files will not be bundles automaticly on the web.
+
+
 ## Goal of this fork of stockfish_chess_engine
 
 * Avoid limitation. This version does not redirect stdout and stdin of the app for communication with stockfish.
@@ -42,3 +68,5 @@ A complete Example can be found at [stockfish_chess_engine](https://github.com/l
 Directory src/Stockfish contains the latest current release.
 The code is modified to use a different communication interface.
 The original license for [Stockfish](https://stockfishchess.org) can be found in their [GitHub](https://github.com/official-stockfish/Stockfish) repository.
+
+Directory web/ may contains code compiled from [emscripten](https://emscripten.org/). Emscripten is licensed among others under the MIT License. [License Page](https://emscripten.org/docs/introducing_emscripten/emscripten_license.html)

example/.gitignore

@@ -0,0 +1,44 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release

example/README.md

@@ -0,0 +1 @@
+Example reused from [stockfish_chess_engine](https://github.com/loloof64/StockfishChessEngineFlutter).

example/analysis_options.yaml

@@ -0,0 +1,28 @@
+# This file configures the analyzer, which statically analyzes Dart code to
+# check for errors, warnings, and lints.
+#
+# The issues identified by the analyzer are surfaced in the UI of Dart-enabled
+# IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be
+# invoked from the command line by running `flutter analyze`.
+
+# The following line activates a set of recommended lints for Flutter apps,
+# packages, and plugins designed to encourage good coding practices.
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  # The lint rules applied to this project can be customized in the
+  # section below to disable rules from the `package:flutter_lints/flutter.yaml`
+  # included above or to enable additional rules. A list of all available lints
+  # and their documentation is published at https://dart.dev/lints.
+  #
+  # Instead of disabling a lint rule for the entire project in the
+  # section below, it can also be suppressed for a single line of code
+  # or a specific dart file by using the `// ignore: name_of_lint` and
+  # `// ignore_for_file: name_of_lint` syntax on the line or in the file
+  # producing the lint.
+  rules:
+    # avoid_print: false  # Uncomment to disable the `avoid_print` rule
+    # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

example/android/.gitignore

@@ -0,0 +1,13 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
+key.properties
+**/*.keystore
+**/*.jks

example/android/app/build.gradle

@@ -0,0 +1,67 @@
+plugins {
+    id "com.android.application"
+    id "kotlin-android"
+    id "dev.flutter.flutter-gradle-plugin"
+}
+
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+android {
+    namespace "com.example.flutter_stockfish_plugin_example"
+    compileSdkVersion flutter.compileSdkVersion
+    ndkVersion flutter.ndkVersion
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "com.example.flutter_stockfish_plugin_example"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {}

example/android/app/src/debug/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

example/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,33 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application
+        android:label="flutter_stockfish_plugin_example"
+        android:name="${applicationName}"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+</manifest>

example/android/app/src/main/kotlin/com/example/flutter_stockfish_plugin_example/MainActivity.kt

@@ -0,0 +1,6 @@
+package com.example.flutter_stockfish_plugin_example
+
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity: FlutterActivity() {
+}

example/android/app/src/main/res/drawable-v21/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

example/android/app/src/main/res/drawable/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

example/android/app/src/main/res/values-night/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

example/android/app/src/main/res/values/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

example/android/app/src/profile/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

example/android/build.gradle

@@ -0,0 +1,31 @@
+buildscript {
+    ext.kotlin_version = '1.7.10'
+    repositories {
+        google()
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath 'com.android.tools.build:gradle:7.3.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+    project.evaluationDependsOn(':app')
+}
+
+tasks.register("clean", Delete) {
+    delete rootProject.buildDir
+}

example/android/gradle.properties

@@ -0,0 +1,3 @@
+org.gradle.jvmargs=-Xmx1536M
+android.useAndroidX=true
+android.enableJetifier=true

example/android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-all.zip

example/android/settings.gradle

@@ -0,0 +1,29 @@
+pluginManagement {
+    def flutterSdkPath = {
+        def properties = new Properties()
+        file("local.properties").withInputStream { properties.load(it) }
+        def flutterSdkPath = properties.getProperty("flutter.sdk")
+        assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+        return flutterSdkPath
+    }
+    settings.ext.flutterSdkPath = flutterSdkPath()
+
+    includeBuild("${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle")
+
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+
+    plugins {
+        id "dev.flutter.flutter-gradle-plugin" version "1.0.0" apply false
+    }
+}
+
+plugins {
+    id "dev.flutter.flutter-plugin-loader" version "1.0.0"
+    id "com.android.application" version "7.3.0" apply false
+}
+
+include ":app"

example/lib/main.dart

@@ -1,6 +1,3 @@
-Example reused from [stockfish_chess_engine](https://github.com/loloof64/StockfishChessEngineFlutter).
-
-```dart
 import 'dart:async';
 
 import 'package:clipboard/clipboard.dart';
@@ -43,7 +40,7 @@ class MyAppState extends State<MyApp> with WindowListener {
   }
 
   Future<void> _overrideDefaultCloseHandler() async {
-    await windowManager.setPreventClose(true);
+    //await windowManager.setPreventClose(true);
     setState(() {});
   }
 
@@ -234,4 +231,3 @@ class MyAppState extends State<MyApp> with WindowListener {
     );
   }
 }
-```

example/linux/.gitignore

@@ -0,0 +1 @@
+flutter/ephemeral

example/linux/CMakeLists.txt

@@ -0,0 +1,145 @@
+# Project-level configuration.
+cmake_minimum_required(VERSION 3.10)
+project(runner LANGUAGES CXX)
+
+# The name of the executable created for the application. Change this to change
+# the on-disk name of your application.
+set(BINARY_NAME "flutter_stockfish_plugin_example")
+# The unique GTK application identifier for this application. See:
+# https://wiki.gnome.org/HowDoI/ChooseApplicationID
+set(APPLICATION_ID "com.example.flutter_stockfish_plugin_example")
+
+# Explicitly opt in to modern CMake behaviors to avoid warnings with recent
+# versions of CMake.
+cmake_policy(SET CMP0063 NEW)
+
+# Load bundled libraries from the lib/ directory relative to the binary.
+set(CMAKE_INSTALL_RPATH "$ORIGIN/lib")
+
+# Root filesystem for cross-building.
+if(FLUTTER_TARGET_PLATFORM_SYSROOT)
+  set(CMAKE_SYSROOT ${FLUTTER_TARGET_PLATFORM_SYSROOT})
+  set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
+  set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+  set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+  set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+  set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+
+# Define build configuration options.
+if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+  set(CMAKE_BUILD_TYPE "Debug" CACHE
+    STRING "Flutter build mode" FORCE)
+  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
+    "Debug" "Profile" "Release")
+endif()
+
+# Compilation settings that should be applied to most targets.
+#
+# Be cautious about adding new options here, as plugins use this function by
+# default. In most cases, you should add new options to specific targets instead
+# of modifying this function.
+function(APPLY_STANDARD_SETTINGS TARGET)
+  target_compile_features(${TARGET} PUBLIC cxx_std_14)
+  target_compile_options(${TARGET} PRIVATE -Wall -Werror)
+  target_compile_options(${TARGET} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:-O3>")
+  target_compile_definitions(${TARGET} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:NDEBUG>")
+endfunction()
+
+# Flutter library and tool build rules.
+set(FLUTTER_MANAGED_DIR "${CMAKE_CURRENT_SOURCE_DIR}/flutter")
+add_subdirectory(${FLUTTER_MANAGED_DIR})
+
+# System-level dependencies.
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
+
+add_definitions(-DAPPLICATION_ID="${APPLICATION_ID}")
+
+# Define the application target. To change its name, change BINARY_NAME above,
+# not the value here, or `flutter run` will no longer work.
+#
+# Any new source files that you add to the application should be added here.
+add_executable(${BINARY_NAME}
+  "main.cc"
+  "my_application.cc"
+  "${FLUTTER_MANAGED_DIR}/generated_plugin_registrant.cc"
+)
+
+# Apply the standard set of build settings. This can be removed for applications
+# that need different build settings.
+apply_standard_settings(${BINARY_NAME})
+
+# Add dependency libraries. Add any application-specific dependencies here.
+target_link_libraries(${BINARY_NAME} PRIVATE flutter)
+target_link_libraries(${BINARY_NAME} PRIVATE PkgConfig::GTK)
+
+# Run the Flutter tool portions of the build. This must not be removed.
+add_dependencies(${BINARY_NAME} flutter_assemble)
+
+# Only the install-generated bundle's copy of the executable will launch
+# correctly, since the resources must in the right relative locations. To avoid
+# people trying to run the unbundled copy, put it in a subdirectory instead of
+# the default top-level location.
+set_target_properties(${BINARY_NAME}
+  PROPERTIES
+  RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/intermediates_do_not_run"
+)
+
+
+# Generated plugin build rules, which manage building the plugins and adding
+# them to the application.
+include(flutter/generated_plugins.cmake)
+
+
+# === Installation ===
+# By default, "installing" just makes a relocatable bundle in the build
+# directory.
+set(BUILD_BUNDLE_DIR "${PROJECT_BINARY_DIR}/bundle")
+if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+  set(CMAKE_INSTALL_PREFIX "${BUILD_BUNDLE_DIR}" CACHE PATH "..." FORCE)
+endif()
+
+# Start with a clean build bundle directory every time.
+install(CODE "
+  file(REMOVE_RECURSE \"${BUILD_BUNDLE_DIR}/\")
+  " COMPONENT Runtime)
+
+set(INSTALL_BUNDLE_DATA_DIR "${CMAKE_INSTALL_PREFIX}/data")
+set(INSTALL_BUNDLE_LIB_DIR "${CMAKE_INSTALL_PREFIX}/lib")
+
+install(TARGETS ${BINARY_NAME} RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_ICU_DATA_FILE}" DESTINATION "${INSTALL_BUNDLE_DATA_DIR}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+  COMPONENT Runtime)
+
+foreach(bundled_library ${PLUGIN_BUNDLED_LIBRARIES})
+  install(FILES "${bundled_library}"
+    DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+endforeach(bundled_library)
+
+# Copy the native assets provided by the build.dart from all packages.
+set(NATIVE_ASSETS_DIR "${PROJECT_BUILD_DIR}native_assets/linux/")
+install(DIRECTORY "${NATIVE_ASSETS_DIR}"
+   DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+   COMPONENT Runtime)
+
+# Fully re-copy the assets directory on each build to avoid having stale files
+# from a previous install.
+set(FLUTTER_ASSET_DIR_NAME "flutter_assets")
+install(CODE "
+  file(REMOVE_RECURSE \"${INSTALL_BUNDLE_DATA_DIR}/${FLUTTER_ASSET_DIR_NAME}\")
+  " COMPONENT Runtime)
+install(DIRECTORY "${PROJECT_BUILD_DIR}/${FLUTTER_ASSET_DIR_NAME}"
+  DESTINATION "${INSTALL_BUNDLE_DATA_DIR}" COMPONENT Runtime)
+
+# Install the AOT library on non-Debug builds only.
+if(NOT CMAKE_BUILD_TYPE MATCHES "Debug")
+  install(FILES "${AOT_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+endif()

example/linux/flutter/CMakeLists.txt

@@ -0,0 +1,88 @@
+# This file controls Flutter-level build steps. It should not be edited.
+cmake_minimum_required(VERSION 3.10)
+
+set(EPHEMERAL_DIR "${CMAKE_CURRENT_SOURCE_DIR}/ephemeral")
+
+# Configuration provided via flutter tool.
+include(${EPHEMERAL_DIR}/generated_config.cmake)
+
+# TODO: Move the rest of this into files in ephemeral. See
+# https://github.com/flutter/flutter/issues/57146.
+
+# Serves the same purpose as list(TRANSFORM ... PREPEND ...),
+# which isn't available in 3.10.
+function(list_prepend LIST_NAME PREFIX)
+    set(NEW_LIST "")
+    foreach(element ${${LIST_NAME}})
+        list(APPEND NEW_LIST "${PREFIX}${element}")
+    endforeach(element)
+    set(${LIST_NAME} "${NEW_LIST}" PARENT_SCOPE)
+endfunction()
+
+# === Flutter Library ===
+# System-level dependencies.
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
+pkg_check_modules(GLIB REQUIRED IMPORTED_TARGET glib-2.0)
+pkg_check_modules(GIO REQUIRED IMPORTED_TARGET gio-2.0)
+
+set(FLUTTER_LIBRARY "${EPHEMERAL_DIR}/libflutter_linux_gtk.so")
+
+# Published to parent scope for install step.
+set(FLUTTER_LIBRARY ${FLUTTER_LIBRARY} PARENT_SCOPE)
+set(FLUTTER_ICU_DATA_FILE "${EPHEMERAL_DIR}/icudtl.dat" PARENT_SCOPE)
+set(PROJECT_BUILD_DIR "${PROJECT_DIR}/build/" PARENT_SCOPE)
+set(AOT_LIBRARY "${PROJECT_DIR}/build/lib/libapp.so" PARENT_SCOPE)
+
+list(APPEND FLUTTER_LIBRARY_HEADERS
+  "fl_basic_message_channel.h"
+  "fl_binary_codec.h"
+  "fl_binary_messenger.h"
+  "fl_dart_project.h"
+  "fl_engine.h"
+  "fl_json_message_codec.h"
+  "fl_json_method_codec.h"
+  "fl_message_codec.h"
+  "fl_method_call.h"
+  "fl_method_channel.h"
+  "fl_method_codec.h"
+  "fl_method_response.h"
+  "fl_plugin_registrar.h"
+  "fl_plugin_registry.h"
+  "fl_standard_message_codec.h"
+  "fl_standard_method_codec.h"
+  "fl_string_codec.h"
+  "fl_value.h"
+  "fl_view.h"
+  "flutter_linux.h"
+)
+list_prepend(FLUTTER_LIBRARY_HEADERS "${EPHEMERAL_DIR}/flutter_linux/")
+add_library(flutter INTERFACE)
+target_include_directories(flutter INTERFACE
+  "${EPHEMERAL_DIR}"
+)
+target_link_libraries(flutter INTERFACE "${FLUTTER_LIBRARY}")
+target_link_libraries(flutter INTERFACE
+  PkgConfig::GTK
+  PkgConfig::GLIB
+  PkgConfig::GIO
+)
+add_dependencies(flutter flutter_assemble)
+
+# === Flutter tool backend ===
+# _phony_ is a non-existent file to force this command to run every time,
+# since currently there's no way to get a full input/output list from the
+# flutter tool.
+add_custom_command(
+  OUTPUT ${FLUTTER_LIBRARY} ${FLUTTER_LIBRARY_HEADERS}
+    ${CMAKE_CURRENT_BINARY_DIR}/_phony_
+  COMMAND ${CMAKE_COMMAND} -E env
+    ${FLUTTER_TOOL_ENVIRONMENT}
+    "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.sh"
+      ${FLUTTER_TARGET_PLATFORM} ${CMAKE_BUILD_TYPE}
+  VERBATIM
+)
+add_custom_target(flutter_assemble DEPENDS
+  "${FLUTTER_LIBRARY}"
+  ${FLUTTER_LIBRARY_HEADERS}
+)

example/linux/flutter/generated_plugin_registrant.cc

@@ -0,0 +1,19 @@
+//
+//  Generated file. Do not edit.
+//
+
+// clang-format off
+
+#include "generated_plugin_registrant.h"
+
+#include <screen_retriever/screen_retriever_plugin.h>
+#include <window_manager/window_manager_plugin.h>
+
+void fl_register_plugins(FlPluginRegistry* registry) {
+  g_autoptr(FlPluginRegistrar) screen_retriever_registrar =
+      fl_plugin_registry_get_registrar_for_plugin(registry, "ScreenRetrieverPlugin");
+  screen_retriever_plugin_register_with_registrar(screen_retriever_registrar);
+  g_autoptr(FlPluginRegistrar) window_manager_registrar =
+      fl_plugin_registry_get_registrar_for_plugin(registry, "WindowManagerPlugin");
+  window_manager_plugin_register_with_registrar(window_manager_registrar);
+}

example/linux/flutter/generated_plugin_registrant.h

@@ -0,0 +1,15 @@
+//
+//  Generated file. Do not edit.
+//
+
+// clang-format off
+
+#ifndef GENERATED_PLUGIN_REGISTRANT_
+#define GENERATED_PLUGIN_REGISTRANT_
+
+#include <flutter_linux/flutter_linux.h>
+
+// Registers Flutter plugins.
+void fl_register_plugins(FlPluginRegistry* registry);
+
+#endif  // GENERATED_PLUGIN_REGISTRANT_

example/linux/flutter/generated_plugins.cmake

@@ -0,0 +1,26 @@
+#
+# Generated file, do not edit.
+#
+
+list(APPEND FLUTTER_PLUGIN_LIST
+  screen_retriever
+  window_manager
+)
+
+list(APPEND FLUTTER_FFI_PLUGIN_LIST
+  flutter_stockfish_plugin
+)
+
+set(PLUGIN_BUNDLED_LIBRARIES)
+
+foreach(plugin ${FLUTTER_PLUGIN_LIST})
+  add_subdirectory(flutter/ephemeral/.plugin_symlinks/${plugin}/linux plugins/${plugin})
+  target_link_libraries(${BINARY_NAME} PRIVATE ${plugin}_plugin)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES $<TARGET_FILE:${plugin}_plugin>)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES ${${plugin}_bundled_libraries})
+endforeach(plugin)
+
+foreach(ffi_plugin ${FLUTTER_FFI_PLUGIN_LIST})
+  add_subdirectory(flutter/ephemeral/.plugin_symlinks/${ffi_plugin}/linux plugins/${ffi_plugin})
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES ${${ffi_plugin}_bundled_libraries})
+endforeach(ffi_plugin)

example/linux/main.cc

@@ -0,0 +1,6 @@
+#include "my_application.h"
+
+int main(int argc, char** argv) {
+  g_autoptr(MyApplication) app = my_application_new();
+  return g_application_run(G_APPLICATION(app), argc, argv);
+}

example/linux/my_application.cc

@@ -0,0 +1,104 @@
+#include "my_application.h"
+
+#include <flutter_linux/flutter_linux.h>
+#ifdef GDK_WINDOWING_X11
+#include <gdk/gdkx.h>
+#endif
+
+#include "flutter/generated_plugin_registrant.h"
+
+struct _MyApplication {
+  GtkApplication parent_instance;
+  char** dart_entrypoint_arguments;
+};
+
+G_DEFINE_TYPE(MyApplication, my_application, GTK_TYPE_APPLICATION)
+
+// Implements GApplication::activate.
+static void my_application_activate(GApplication* application) {
+  MyApplication* self = MY_APPLICATION(application);
+  GtkWindow* window =
+      GTK_WINDOW(gtk_application_window_new(GTK_APPLICATION(application)));
+
+  // Use a header bar when running in GNOME as this is the common style used
+  // by applications and is the setup most users will be using (e.g. Ubuntu
+  // desktop).
+  // If running on X and not using GNOME then just use a traditional title bar
+  // in case the window manager does more exotic layout, e.g. tiling.
+  // If running on Wayland assume the header bar will work (may need changing
+  // if future cases occur).
+  gboolean use_header_bar = TRUE;
+#ifdef GDK_WINDOWING_X11
+  GdkScreen* screen = gtk_window_get_screen(window);
+  if (GDK_IS_X11_SCREEN(screen)) {
+    const gchar* wm_name = gdk_x11_screen_get_window_manager_name(screen);
+    if (g_strcmp0(wm_name, "GNOME Shell") != 0) {
+      use_header_bar = FALSE;
+    }
+  }
+#endif
+  if (use_header_bar) {
+    GtkHeaderBar* header_bar = GTK_HEADER_BAR(gtk_header_bar_new());
+    gtk_widget_show(GTK_WIDGET(header_bar));
+    gtk_header_bar_set_title(header_bar, "flutter_stockfish_plugin_example");
+    gtk_header_bar_set_show_close_button(header_bar, TRUE);
+    gtk_window_set_titlebar(window, GTK_WIDGET(header_bar));
+  } else {
+    gtk_window_set_title(window, "flutter_stockfish_plugin_example");
+  }
+
+  gtk_window_set_default_size(window, 1280, 720);
+  gtk_widget_show(GTK_WIDGET(window));
+
+  g_autoptr(FlDartProject) project = fl_dart_project_new();
+  fl_dart_project_set_dart_entrypoint_arguments(project, self->dart_entrypoint_arguments);
+
+  FlView* view = fl_view_new(project);
+  gtk_widget_show(GTK_WIDGET(view));
+  gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(view));
+
+  fl_register_plugins(FL_PLUGIN_REGISTRY(view));
+
+  gtk_widget_grab_focus(GTK_WIDGET(view));
+}
+
+// Implements GApplication::local_command_line.
+static gboolean my_application_local_command_line(GApplication* application, gchar*** arguments, int* exit_status) {
+  MyApplication* self = MY_APPLICATION(application);
+  // Strip out the first argument as it is the binary name.
+  self->dart_entrypoint_arguments = g_strdupv(*arguments + 1);
+
+  g_autoptr(GError) error = nullptr;
+  if (!g_application_register(application, nullptr, &error)) {
+     g_warning("Failed to register: %s", error->message);
+     *exit_status = 1;
+     return TRUE;
+  }
+
+  g_application_activate(application);
+  *exit_status = 0;
+
+  return TRUE;
+}
+
+// Implements GObject::dispose.
+static void my_application_dispose(GObject* object) {
+  MyApplication* self = MY_APPLICATION(object);
+  g_clear_pointer(&self->dart_entrypoint_arguments, g_strfreev);
+  G_OBJECT_CLASS(my_application_parent_class)->dispose(object);
+}
+
+static void my_application_class_init(MyApplicationClass* klass) {
+  G_APPLICATION_CLASS(klass)->activate = my_application_activate;
+  G_APPLICATION_CLASS(klass)->local_command_line = my_application_local_command_line;
+  G_OBJECT_CLASS(klass)->dispose = my_application_dispose;
+}
+
+static void my_application_init(MyApplication* self) {}
+
+MyApplication* my_application_new() {
+  return MY_APPLICATION(g_object_new(my_application_get_type(),
+                                     "application-id", APPLICATION_ID,
+                                     "flags", G_APPLICATION_NON_UNIQUE,
+                                     nullptr));
+}

example/linux/my_application.h

@@ -0,0 +1,18 @@
+#ifndef FLUTTER_MY_APPLICATION_H_
+#define FLUTTER_MY_APPLICATION_H_
+
+#include <gtk/gtk.h>
+
+G_DECLARE_FINAL_TYPE(MyApplication, my_application, MY, APPLICATION,
+                     GtkApplication)
+
+/**
+ * my_application_new:
+ *
+ * Creates a new Flutter-based application.
+ *
+ * Returns: a new #MyApplication.
+ */
+MyApplication* my_application_new();
+
+#endif  // FLUTTER_MY_APPLICATION_H_

example/pubspec.lock

@@ -0,0 +1,276 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  async:
+    dependency: transitive
+    description:
+      name: async
+      sha256: "947bfcf187f74dbc5e146c9eb9c0f10c9f8b30743e341481c1e2ed3ecc18c20c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.11.0"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      sha256: "6cfb5af12253eaf2b368f07bacc5a80d1301a071c73360d746b7f2e32d762c66"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.1"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      sha256: "04a925763edad70e8443c99234dc3328f442e811f1d8fd1a72f1c8ad0f69a605"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.0"
+  chess:
+    dependency: "direct main"
+    description:
+      name: chess
+      sha256: "6e5a8222931bfb5cd14a4bb9b030c24e257e23957ec3c533fb0ff74a48984ddb"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.8.1"
+  clipboard:
+    dependency: "direct main"
+    description:
+      name: clipboard
+      sha256: "2ec38f0e59878008ceca0ab122e4bfde98847f88ef0f83331362ba4521f565a9"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.3"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      sha256: cb6d7f03e1de671e34607e909a7213e31d7752be4fb66a86d29fe1eb14bfb5cf
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      sha256: ee67cb0715911d28db6bf4af1026078bd6f0128b07a5f66fb2ed94ec6783c09a
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.18.0"
+  cupertino_icons:
+    dependency: "direct main"
+    description:
+      name: cupertino_icons
+      sha256: d57953e10f9f8327ce64a508a355f0b1ec902193f66288e8cb5070e7c47eeb2d
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.0.6"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      sha256: "511392330127add0b769b75a987850d136345d9227c6b94c96a04cf4a391bf78"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.1"
+  ffi:
+    dependency: transitive
+    description:
+      name: ffi
+      sha256: "493f37e7df1804778ff3a53bd691d8692ddf69702cf4c1c1096a2e41b4779e21"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_lints:
+    dependency: "direct dev"
+    description:
+      name: flutter_lints
+      sha256: e2a421b7e59244faef694ba7b30562e489c2b489866e505074eb005cd7060db7
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.1"
+  flutter_stockfish_plugin:
+    dependency: "direct main"
+    description:
+      path: ".."
+      relative: true
+    source: path
+    version: "1.1.0"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  leak_tracker:
+    dependency: transitive
+    description:
+      name: leak_tracker
+      sha256: "78eb209deea09858f5269f5a5b02be4049535f568c07b275096836f01ea323fa"
+      url: "https://pub.dev"
+    source: hosted
+    version: "10.0.0"
+  leak_tracker_flutter_testing:
+    dependency: transitive
+    description:
+      name: leak_tracker_flutter_testing
+      sha256: b46c5e37c19120a8a01918cfaf293547f47269f7cb4b0058f21531c2465d6ef0
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.1"
+  leak_tracker_testing:
+    dependency: transitive
+    description:
+      name: leak_tracker_testing
+      sha256: a597f72a664dbd293f3bfc51f9ba69816f84dcd403cdac7066cb3f6003f3ab47
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.0.1"
+  lints:
+    dependency: transitive
+    description:
+      name: lints
+      sha256: cbf8d4b858bb0134ef3ef87841abdf8d63bfc255c266b7bf6b39daa1085c4290
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.0"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      sha256: d2323aa2060500f906aa31a895b4030b6da3ebdcc5619d14ce1aada65cd161cb
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.12.16+1"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      sha256: "0e0a020085b65b6083975e499759762399b4475f766c21668c4ecca34ea74e5a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.8.0"
+  material_design_icons_flutter:
+    dependency: "direct main"
+    description:
+      name: material_design_icons_flutter
+      sha256: "6f986b7a51f3ad4c00e33c5c84e8de1bdd140489bbcdc8b66fc1283dad4dea5a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "7.0.7296"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      sha256: d584fa6707a52763a52446f02cc621b077888fb63b93bbcb1143a7be5a0c0c04
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.11.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      sha256: "087ce49c3f0dc39180befefc60fdb4acd8f8620e5682fe2476afd0b3688bb4af"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.9.0"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      sha256: "4820fbfdb9478b1ebae27888254d445073732dae3d6ea81f0b7e06d5dedc3f02"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.8"
+  screen_retriever:
+    dependency: transitive
+    description:
+      name: screen_retriever
+      sha256: "6ee02c8a1158e6dae7ca430da79436e3b1c9563c8cf02f524af997c201ac2b90"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.9"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.99"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      sha256: "53e943d4206a5e30df338fd4c6e7a077e02254531b138a15aec3bd143c1a8b3c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.10.0"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      sha256: "73713990125a6d93122541237550ee3352a2d84baad52d375a4cad2eb9b7ce0b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.11.1"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      sha256: ba2aa5d8cc609d96bbb2899c28934f9e1af5cddbd60a827822ea467161eb54e7
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.0"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.1"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      sha256: "5c2f730018264d276c20e4f1503fd1308dfbbae39ec8ee63c5236311ac06954b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.6.1"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.4"
+  vm_service:
+    dependency: transitive
+    description:
+      name: vm_service
+      sha256: b3d56ff4341b8f182b96aceb2fa20e3dcb336b9f867bc0eafc0de10f1048e957
+      url: "https://pub.dev"
+    source: hosted
+    version: "13.0.0"
+  window_manager:
+    dependency: "direct main"
+    description:
+      name: window_manager
+      sha256: b3c895bdf936c77b83c5254bec2e6b3f066710c1f89c38b20b8acc382b525494
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.3.8"
+sdks:
+  dart: ">=3.3.0-279.1.beta <4.0.0"
+  flutter: ">=3.3.0"

example/pubspec.yaml

@@ -0,0 +1,100 @@
+name: flutter_stockfish_plugin_example
+description: Demonstrates how to use the flutter_stockfish_plugin plugin.
+# The following line prevents the package from being accidentally published to
+# pub.dev using `flutter pub publish`. This is preferred for private packages.
+publish_to: "none" # Remove this line if you wish to publish to pub.dev
+
+# The following defines the version and build number for your application.
+# A version number is three numbers separated by dots, like 1.2.43
+# followed by an optional build number separated by a +.
+# Both the version and the builder number may be overridden in flutter
+# build by specifying --build-name and --build-number, respectively.
+# In Android, build-name is used as versionName while build-number used as versionCode.
+# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
+# In iOS, build-name is used as CFBundleShortVersionString while build-number is used as CFBundleVersion.
+# Read more about iOS versioning at
+# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
+# In Windows, build-name is used as the major, minor, and patch parts
+# of the product and file versions while build-number is used as the build suffix.
+version: 1.0.0+1
+
+environment:
+  sdk: ">=3.1.3 <4.0.0"
+
+# Dependencies specify other packages that your package needs in order to work.
+# To automatically upgrade your package dependencies to the latest versions
+# consider running `flutter pub upgrade --major-versions`. Alternatively,
+# dependencies can be manually updated by changing the version numbers below to
+# the latest version available on pub.dev. To see which dependencies have newer
+# versions available, run `flutter pub outdated`.
+dependencies:
+  flutter:
+    sdk: flutter
+
+  flutter_stockfish_plugin:
+    # When depending on this package from a real application you should use:
+    #   flutter_stockfish_plugin2: ^x.y.z
+    # See https://dart.dev/tools/pub/dependencies#version-constraints
+    # The example app is bundled with the plugin so we use a path dependency on
+    # the parent directory to use the current plugin's version.
+    path: ../
+
+  # The following adds the Cupertino Icons font to your application.
+  # Use with the CupertinoIcons class for iOS style icons.
+  cupertino_icons: ^1.0.2
+  clipboard: ^0.1.3
+  chess: ^0.8.1
+  material_design_icons_flutter: ^7.0.7296
+  window_manager: ^0.3.7
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+
+  # The "flutter_lints" package below contains a set of recommended lints to
+  # encourage good coding practices. The lint set provided by the package is
+  # activated in the `analysis_options.yaml` file located at the root of your
+  # package. See that file for information about deactivating specific lint
+  # rules and activating additional ones.
+  flutter_lints: ^3.0.1
+
+# For information on the generic Dart part of this file, see the
+# following page: https://dart.dev/tools/pub/pubspec
+
+# The following section is specific to Flutter packages.
+flutter:
+  # The following line ensures that the Material Icons font is
+  # included with your application, so that you can use the icons in
+  # the material Icons class.
+  uses-material-design: true
+
+  # To add assets to your application, add an assets section, like this:
+  # assets:
+  #   - images/a_dot_burr.jpeg
+  #   - images/a_dot_ham.jpeg
+
+  # An image asset can refer to one or more resolution-specific "variants", see
+  # https://flutter.dev/assets-and-images/#resolution-aware
+
+  # For details regarding adding assets from package dependencies, see
+  # https://flutter.dev/assets-and-images/#from-packages
+
+  # To add custom fonts to your application, add a fonts section here,
+  # in this "flutter" section. Each entry in this list should have a
+  # "family" key with the font family name, and a "fonts" key with a
+  # list giving the asset and other descriptors for the font. For
+  # example:
+  # fonts:
+  #   - family: Schyler
+  #     fonts:
+  #       - asset: fonts/Schyler-Regular.ttf
+  #       - asset: fonts/Schyler-Italic.ttf
+  #         style: italic
+  #   - family: Trajan Pro
+  #     fonts:
+  #       - asset: fonts/TrajanPro.ttf
+  #       - asset: fonts/TrajanPro_Bold.ttf
+  #         weight: 700
+  #
+  # For details regarding fonts from package dependencies,
+  # see https://flutter.dev/custom-fonts/#from-packages

example/web/index.html

@@ -0,0 +1,59 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <!--
+    If you are serving your web app in a path other than the root, change the
+    href value below to reflect the base path you are serving from.
+
+    The path provided below has to start and end with a slash "/" in order for
+    it to work correctly.
+
+    For more details:
+    * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
+
+    This is a placeholder for base href that will be replaced by the value of
+    the `--base-href` argument provided to `flutter build`.
+  -->
+  <base href="$FLUTTER_BASE_HREF">
+
+  <meta charset="UTF-8">
+  <meta content="IE=Edge" http-equiv="X-UA-Compatible">
+  <meta name="description" content="A new Flutter project.">
+
+  <!-- iOS meta tags & icons -->
+  <meta name="apple-mobile-web-app-capable" content="yes">
+  <meta name="apple-mobile-web-app-status-bar-style" content="black">
+  <meta name="apple-mobile-web-app-title" content="chess_analyser">
+  <link rel="apple-touch-icon" href="icons/Icon-192.png">
+
+  <!-- Favicon -->
+  <link rel="icon" type="image/png" href="favicon.png"/>
+
+  <title>chess_analyser</title>
+  <link rel="manifest" href="manifest.json">
+
+  <script>
+    // The value below is injected by flutter build, do not touch.
+    const serviceWorkerVersion = null;
+  </script>
+  <!-- This script adds the flutter initialization JS code -->
+  <script src="flutter.js" defer></script>
+</head>
+<body>
+  <script>
+    window.addEventListener('load', function(ev) {
+      // Download main.dart.js
+      _flutter.loader.loadEntrypoint({
+        serviceWorker: {
+          serviceWorkerVersion: serviceWorkerVersion,
+        },
+        onEntrypointLoaded: function(engineInitializer) {
+          engineInitializer.initializeEngine().then(function(appRunner) {
+            appRunner.runApp();
+          });
+        }
+      });
+    });
+  </script>
+</body>
+</html>

example/web/manifest.json

@@ -0,0 +1,35 @@
+{
+    "name": "chess_analyser",
+    "short_name": "chess_analyser",
+    "start_url": ".",
+    "display": "standalone",
+    "background_color": "#0175C2",
+    "theme_color": "#0175C2",
+    "description": "A new Flutter project.",
+    "orientation": "portrait-primary",
+    "prefer_related_applications": false,
+    "icons": [
+        {
+            "src": "icons/Icon-192.png",
+            "sizes": "192x192",
+            "type": "image/png"
+        },
+        {
+            "src": "icons/Icon-512.png",
+            "sizes": "512x512",
+            "type": "image/png"
+        },
+        {
+            "src": "icons/Icon-maskable-192.png",
+            "sizes": "192x192",
+            "type": "image/png",
+            "purpose": "maskable"
+        },
+        {
+            "src": "icons/Icon-maskable-512.png",
+            "sizes": "512x512",
+            "type": "image/png",
+            "purpose": "maskable"
+        }
+    ]
+}

example/windows/.gitignore

@@ -0,0 +1,17 @@
+flutter/ephemeral/
+
+# Visual Studio user-specific files.
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# Visual Studio build-related files.
+x64/
+x86/
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!*.[Cc]ache/

example/windows/CMakeLists.txt

@@ -0,0 +1,108 @@
+# Project-level configuration.
+cmake_minimum_required(VERSION 3.14)
+project(flutter_stockfish_plugin_example LANGUAGES CXX)
+
+# The name of the executable created for the application. Change this to change
+# the on-disk name of your application.
+set(BINARY_NAME "flutter_stockfish_plugin_example")
+
+# Explicitly opt in to modern CMake behaviors to avoid warnings with recent
+# versions of CMake.
+cmake_policy(VERSION 3.14...3.25)
+
+# Define build configuration option.
+get_property(IS_MULTICONFIG GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
+if(IS_MULTICONFIG)
+  set(CMAKE_CONFIGURATION_TYPES "Debug;Profile;Release"
+    CACHE STRING "" FORCE)
+else()
+  if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+    set(CMAKE_BUILD_TYPE "Debug" CACHE
+      STRING "Flutter build mode" FORCE)
+    set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
+      "Debug" "Profile" "Release")
+  endif()
+endif()
+# Define settings for the Profile build mode.
+set(CMAKE_EXE_LINKER_FLAGS_PROFILE "${CMAKE_EXE_LINKER_FLAGS_RELEASE}")
+set(CMAKE_SHARED_LINKER_FLAGS_PROFILE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE}")
+set(CMAKE_C_FLAGS_PROFILE "${CMAKE_C_FLAGS_RELEASE}")
+set(CMAKE_CXX_FLAGS_PROFILE "${CMAKE_CXX_FLAGS_RELEASE}")
+
+# Use Unicode for all projects.
+add_definitions(-DUNICODE -D_UNICODE)
+
+# Compilation settings that should be applied to most targets.
+#
+# Be cautious about adding new options here, as plugins use this function by
+# default. In most cases, you should add new options to specific targets instead
+# of modifying this function.
+function(APPLY_STANDARD_SETTINGS TARGET)
+  target_compile_features(${TARGET} PUBLIC cxx_std_17)
+  target_compile_options(${TARGET} PRIVATE /W4 /WX /wd"4100")
+  target_compile_options(${TARGET} PRIVATE /EHsc)
+  target_compile_definitions(${TARGET} PRIVATE "_HAS_EXCEPTIONS=0")
+  target_compile_definitions(${TARGET} PRIVATE "$<$<CONFIG:Debug>:_DEBUG>")
+endfunction()
+
+# Flutter library and tool build rules.
+set(FLUTTER_MANAGED_DIR "${CMAKE_CURRENT_SOURCE_DIR}/flutter")
+add_subdirectory(${FLUTTER_MANAGED_DIR})
+
+# Application build; see runner/CMakeLists.txt.
+add_subdirectory("runner")
+
+
+# Generated plugin build rules, which manage building the plugins and adding
+# them to the application.
+include(flutter/generated_plugins.cmake)
+
+
+# === Installation ===
+# Support files are copied into place next to the executable, so that it can
+# run in place. This is done instead of making a separate bundle (as on Linux)
+# so that building and running from within Visual Studio will work.
+set(BUILD_BUNDLE_DIR "$<TARGET_FILE_DIR:${BINARY_NAME}>")
+# Make the "install" step default, as it's required to run.
+set(CMAKE_VS_INCLUDE_INSTALL_TO_DEFAULT_BUILD 1)
+if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+  set(CMAKE_INSTALL_PREFIX "${BUILD_BUNDLE_DIR}" CACHE PATH "..." FORCE)
+endif()
+
+set(INSTALL_BUNDLE_DATA_DIR "${CMAKE_INSTALL_PREFIX}/data")
+set(INSTALL_BUNDLE_LIB_DIR "${CMAKE_INSTALL_PREFIX}")
+
+install(TARGETS ${BINARY_NAME} RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_ICU_DATA_FILE}" DESTINATION "${INSTALL_BUNDLE_DATA_DIR}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+  COMPONENT Runtime)
+
+if(PLUGIN_BUNDLED_LIBRARIES)
+  install(FILES "${PLUGIN_BUNDLED_LIBRARIES}"
+    DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+endif()
+
+# Copy the native assets provided by the build.dart from all packages.
+set(NATIVE_ASSETS_DIR "${PROJECT_BUILD_DIR}native_assets/windows/")
+install(DIRECTORY "${NATIVE_ASSETS_DIR}"
+   DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+   COMPONENT Runtime)
+
+# Fully re-copy the assets directory on each build to avoid having stale files
+# from a previous install.
+set(FLUTTER_ASSET_DIR_NAME "flutter_assets")
+install(CODE "
+  file(REMOVE_RECURSE \"${INSTALL_BUNDLE_DATA_DIR}/${FLUTTER_ASSET_DIR_NAME}\")
+  " COMPONENT Runtime)
+install(DIRECTORY "${PROJECT_BUILD_DIR}/${FLUTTER_ASSET_DIR_NAME}"
+  DESTINATION "${INSTALL_BUNDLE_DATA_DIR}" COMPONENT Runtime)
+
+# Install the AOT library on non-Debug builds only.
+install(FILES "${AOT_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_DATA_DIR}"
+  CONFIGURATIONS Profile;Release
+  COMPONENT Runtime)

example/windows/flutter/CMakeLists.txt

@@ -0,0 +1,109 @@
+# This file controls Flutter-level build steps. It should not be edited.
+cmake_minimum_required(VERSION 3.14)
+
+set(EPHEMERAL_DIR "${CMAKE_CURRENT_SOURCE_DIR}/ephemeral")
+
+# Configuration provided via flutter tool.
+include(${EPHEMERAL_DIR}/generated_config.cmake)
+
+# TODO: Move the rest of this into files in ephemeral. See
+# https://github.com/flutter/flutter/issues/57146.
+set(WRAPPER_ROOT "${EPHEMERAL_DIR}/cpp_client_wrapper")
+
+# Set fallback configurations for older versions of the flutter tool.
+if (NOT DEFINED FLUTTER_TARGET_PLATFORM)
+  set(FLUTTER_TARGET_PLATFORM "windows-x64")
+endif()
+
+# === Flutter Library ===
+set(FLUTTER_LIBRARY "${EPHEMERAL_DIR}/flutter_windows.dll")
+
+# Published to parent scope for install step.
+set(FLUTTER_LIBRARY ${FLUTTER_LIBRARY} PARENT_SCOPE)
+set(FLUTTER_ICU_DATA_FILE "${EPHEMERAL_DIR}/icudtl.dat" PARENT_SCOPE)
+set(PROJECT_BUILD_DIR "${PROJECT_DIR}/build/" PARENT_SCOPE)
+set(AOT_LIBRARY "${PROJECT_DIR}/build/windows/app.so" PARENT_SCOPE)
+
+list(APPEND FLUTTER_LIBRARY_HEADERS
+  "flutter_export.h"
+  "flutter_windows.h"
+  "flutter_messenger.h"
+  "flutter_plugin_registrar.h"
+  "flutter_texture_registrar.h"
+)
+list(TRANSFORM FLUTTER_LIBRARY_HEADERS PREPEND "${EPHEMERAL_DIR}/")
+add_library(flutter INTERFACE)
+target_include_directories(flutter INTERFACE
+  "${EPHEMERAL_DIR}"
+)
+target_link_libraries(flutter INTERFACE "${FLUTTER_LIBRARY}.lib")
+add_dependencies(flutter flutter_assemble)
+
+# === Wrapper ===
+list(APPEND CPP_WRAPPER_SOURCES_CORE
+  "core_implementations.cc"
+  "standard_codec.cc"
+)
+list(TRANSFORM CPP_WRAPPER_SOURCES_CORE PREPEND "${WRAPPER_ROOT}/")
+list(APPEND CPP_WRAPPER_SOURCES_PLUGIN
+  "plugin_registrar.cc"
+)
+list(TRANSFORM CPP_WRAPPER_SOURCES_PLUGIN PREPEND "${WRAPPER_ROOT}/")
+list(APPEND CPP_WRAPPER_SOURCES_APP
+  "flutter_engine.cc"
+  "flutter_view_controller.cc"
+)
+list(TRANSFORM CPP_WRAPPER_SOURCES_APP PREPEND "${WRAPPER_ROOT}/")
+
+# Wrapper sources needed for a plugin.
+add_library(flutter_wrapper_plugin STATIC
+  ${CPP_WRAPPER_SOURCES_CORE}
+  ${CPP_WRAPPER_SOURCES_PLUGIN}
+)
+apply_standard_settings(flutter_wrapper_plugin)
+set_target_properties(flutter_wrapper_plugin PROPERTIES
+  POSITION_INDEPENDENT_CODE ON)
+set_target_properties(flutter_wrapper_plugin PROPERTIES
+  CXX_VISIBILITY_PRESET hidden)
+target_link_libraries(flutter_wrapper_plugin PUBLIC flutter)
+target_include_directories(flutter_wrapper_plugin PUBLIC
+  "${WRAPPER_ROOT}/include"
+)
+add_dependencies(flutter_wrapper_plugin flutter_assemble)
+
+# Wrapper sources needed for the runner.
+add_library(flutter_wrapper_app STATIC
+  ${CPP_WRAPPER_SOURCES_CORE}
+  ${CPP_WRAPPER_SOURCES_APP}
+)
+apply_standard_settings(flutter_wrapper_app)
+target_link_libraries(flutter_wrapper_app PUBLIC flutter)
+target_include_directories(flutter_wrapper_app PUBLIC
+  "${WRAPPER_ROOT}/include"
+)
+add_dependencies(flutter_wrapper_app flutter_assemble)
+
+# === Flutter tool backend ===
+# _phony_ is a non-existent file to force this command to run every time,
+# since currently there's no way to get a full input/output list from the
+# flutter tool.
+set(PHONY_OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/_phony_")
+set_source_files_properties("${PHONY_OUTPUT}" PROPERTIES SYMBOLIC TRUE)
+add_custom_command(
+  OUTPUT ${FLUTTER_LIBRARY} ${FLUTTER_LIBRARY_HEADERS}
+    ${CPP_WRAPPER_SOURCES_CORE} ${CPP_WRAPPER_SOURCES_PLUGIN}
+    ${CPP_WRAPPER_SOURCES_APP}
+    ${PHONY_OUTPUT}
+  COMMAND ${CMAKE_COMMAND} -E env
+    ${FLUTTER_TOOL_ENVIRONMENT}
+    "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.bat"
+      ${FLUTTER_TARGET_PLATFORM} $<CONFIG>
+  VERBATIM
+)
+add_custom_target(flutter_assemble DEPENDS
+  "${FLUTTER_LIBRARY}"
+  ${FLUTTER_LIBRARY_HEADERS}
+  ${CPP_WRAPPER_SOURCES_CORE}
+  ${CPP_WRAPPER_SOURCES_PLUGIN}
+  ${CPP_WRAPPER_SOURCES_APP}
+)

example/windows/flutter/generated_plugin_registrant.cc

@@ -0,0 +1,17 @@
+//
+//  Generated file. Do not edit.
+//
+
+// clang-format off
+
+#include "generated_plugin_registrant.h"
+
+#include <screen_retriever/screen_retriever_plugin.h>
+#include <window_manager/window_manager_plugin.h>
+
+void RegisterPlugins(flutter::PluginRegistry* registry) {
+  ScreenRetrieverPluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("ScreenRetrieverPlugin"));
+  WindowManagerPluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("WindowManagerPlugin"));
+}

example/windows/flutter/generated_plugin_registrant.h

@@ -0,0 +1,15 @@
+//
+//  Generated file. Do not edit.
+//
+
+// clang-format off
+
+#ifndef GENERATED_PLUGIN_REGISTRANT_
+#define GENERATED_PLUGIN_REGISTRANT_
+
+#include <flutter/plugin_registry.h>
+
+// Registers Flutter plugins.
+void RegisterPlugins(flutter::PluginRegistry* registry);
+
+#endif  // GENERATED_PLUGIN_REGISTRANT_

example/windows/flutter/generated_plugins.cmake

@@ -0,0 +1,26 @@
+#
+# Generated file, do not edit.
+#
+
+list(APPEND FLUTTER_PLUGIN_LIST
+  screen_retriever
+  window_manager
+)
+
+list(APPEND FLUTTER_FFI_PLUGIN_LIST
+  flutter_stockfish_plugin
+)
+
+set(PLUGIN_BUNDLED_LIBRARIES)
+
+foreach(plugin ${FLUTTER_PLUGIN_LIST})
+  add_subdirectory(flutter/ephemeral/.plugin_symlinks/${plugin}/windows plugins/${plugin})
+  target_link_libraries(${BINARY_NAME} PRIVATE ${plugin}_plugin)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES $<TARGET_FILE:${plugin}_plugin>)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES ${${plugin}_bundled_libraries})
+endforeach(plugin)
+
+foreach(ffi_plugin ${FLUTTER_FFI_PLUGIN_LIST})
+  add_subdirectory(flutter/ephemeral/.plugin_symlinks/${ffi_plugin}/windows plugins/${ffi_plugin})
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES ${${ffi_plugin}_bundled_libraries})
+endforeach(ffi_plugin)

example/windows/runner/CMakeLists.txt

@@ -0,0 +1,40 @@
+cmake_minimum_required(VERSION 3.14)
+project(runner LANGUAGES CXX)
+
+# Define the application target. To change its name, change BINARY_NAME in the
+# top-level CMakeLists.txt, not the value here, or `flutter run` will no longer
+# work.
+#
+# Any new source files that you add to the application should be added here.
+add_executable(${BINARY_NAME} WIN32
+  "flutter_window.cpp"
+  "main.cpp"
+  "utils.cpp"
+  "win32_window.cpp"
+  "${FLUTTER_MANAGED_DIR}/generated_plugin_registrant.cc"
+  "Runner.rc"
+  "runner.exe.manifest"
+)
+
+# Apply the standard set of build settings. This can be removed for applications
+# that need different build settings.
+apply_standard_settings(${BINARY_NAME})
+
+# Add preprocessor definitions for the build version.
+target_compile_definitions(${BINARY_NAME} PRIVATE "FLUTTER_VERSION=\"${FLUTTER_VERSION}\"")
+target_compile_definitions(${BINARY_NAME} PRIVATE "FLUTTER_VERSION_MAJOR=${FLUTTER_VERSION_MAJOR}")
+target_compile_definitions(${BINARY_NAME} PRIVATE "FLUTTER_VERSION_MINOR=${FLUTTER_VERSION_MINOR}")
+target_compile_definitions(${BINARY_NAME} PRIVATE "FLUTTER_VERSION_PATCH=${FLUTTER_VERSION_PATCH}")
+target_compile_definitions(${BINARY_NAME} PRIVATE "FLUTTER_VERSION_BUILD=${FLUTTER_VERSION_BUILD}")
+
+# Disable Windows macros that collide with C++ standard library functions.
+target_compile_definitions(${BINARY_NAME} PRIVATE "NOMINMAX")
+
+# Add dependency libraries and include directories. Add any application-specific
+# dependencies here.
+target_link_libraries(${BINARY_NAME} PRIVATE flutter flutter_wrapper_app)
+target_link_libraries(${BINARY_NAME} PRIVATE "dwmapi.lib")
+target_include_directories(${BINARY_NAME} PRIVATE "${CMAKE_SOURCE_DIR}")
+
+# Run the Flutter tool portions of the build. This must not be removed.
+add_dependencies(${BINARY_NAME} flutter_assemble)

example/windows/runner/Runner.rc

@@ -0,0 +1,121 @@
+// Microsoft Visual C++ generated resource script.
+//
+#pragma code_page(65001)
+#include "resource.h"
+
+#define APSTUDIO_READONLY_SYMBOLS
+/////////////////////////////////////////////////////////////////////////////
+//
+// Generated from the TEXTINCLUDE 2 resource.
+//
+#include "winres.h"
+
+/////////////////////////////////////////////////////////////////////////////
+#undef APSTUDIO_READONLY_SYMBOLS
+
+/////////////////////////////////////////////////////////////////////////////
+// English (United States) resources
+
+#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
+
+#ifdef APSTUDIO_INVOKED
+/////////////////////////////////////////////////////////////////////////////
+//
+// TEXTINCLUDE
+//
+
+1 TEXTINCLUDE
+BEGIN
+    "resource.h\0"
+END
+
+2 TEXTINCLUDE
+BEGIN
+    "#include ""winres.h""\r\n"
+    "\0"
+END
+
+3 TEXTINCLUDE
+BEGIN
+    "\r\n"
+    "\0"
+END
+
+#endif    // APSTUDIO_INVOKED
+
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Icon
+//
+
+// Icon with lowest ID value placed first to ensure application icon
+// remains consistent on all systems.
+IDI_APP_ICON            ICON                    "resources\\app_icon.ico"
+
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Version
+//
+
+#if defined(FLUTTER_VERSION_MAJOR) && defined(FLUTTER_VERSION_MINOR) && defined(FLUTTER_VERSION_PATCH) && defined(FLUTTER_VERSION_BUILD)
+#define VERSION_AS_NUMBER FLUTTER_VERSION_MAJOR,FLUTTER_VERSION_MINOR,FLUTTER_VERSION_PATCH,FLUTTER_VERSION_BUILD
+#else
+#define VERSION_AS_NUMBER 1,0,0,0
+#endif
+
+#if defined(FLUTTER_VERSION)
+#define VERSION_AS_STRING FLUTTER_VERSION
+#else
+#define VERSION_AS_STRING "1.0.0"
+#endif
+
+VS_VERSION_INFO VERSIONINFO
+ FILEVERSION VERSION_AS_NUMBER
+ PRODUCTVERSION VERSION_AS_NUMBER
+ FILEFLAGSMASK VS_FFI_FILEFLAGSMASK
+#ifdef _DEBUG
+ FILEFLAGS VS_FF_DEBUG
+#else
+ FILEFLAGS 0x0L
+#endif
+ FILEOS VOS__WINDOWS32
+ FILETYPE VFT_APP
+ FILESUBTYPE 0x0L
+BEGIN
+    BLOCK "StringFileInfo"
+    BEGIN
+        BLOCK "040904e4"
+        BEGIN
+            VALUE "CompanyName", "com.example" "\0"
+            VALUE "FileDescription", "flutter_stockfish_plugin_example" "\0"
+            VALUE "FileVersion", VERSION_AS_STRING "\0"
+            VALUE "InternalName", "flutter_stockfish_plugin_example" "\0"
+            VALUE "LegalCopyright", "Copyright (C) 2023 com.example. All rights reserved." "\0"
+            VALUE "OriginalFilename", "flutter_stockfish_plugin_example.exe" "\0"
+            VALUE "ProductName", "flutter_stockfish_plugin_example" "\0"
+            VALUE "ProductVersion", VERSION_AS_STRING "\0"
+        END
+    END
+    BLOCK "VarFileInfo"
+    BEGIN
+        VALUE "Translation", 0x409, 1252
+    END
+END
+
+#endif    // English (United States) resources
+/////////////////////////////////////////////////////////////////////////////
+
+
+
+#ifndef APSTUDIO_INVOKED
+/////////////////////////////////////////////////////////////////////////////
+//
+// Generated from the TEXTINCLUDE 3 resource.
+//
+
+
+/////////////////////////////////////////////////////////////////////////////
+#endif    // not APSTUDIO_INVOKED

example/windows/runner/flutter_window.cpp

@@ -0,0 +1,71 @@
+#include "flutter_window.h"
+
+#include <optional>
+
+#include "flutter/generated_plugin_registrant.h"
+
+FlutterWindow::FlutterWindow(const flutter::DartProject& project)
+    : project_(project) {}
+
+FlutterWindow::~FlutterWindow() {}
+
+bool FlutterWindow::OnCreate() {
+  if (!Win32Window::OnCreate()) {
+    return false;
+  }
+
+  RECT frame = GetClientArea();
+
+  // The size here must match the window dimensions to avoid unnecessary surface
+  // creation / destruction in the startup path.
+  flutter_controller_ = std::make_unique<flutter::FlutterViewController>(
+      frame.right - frame.left, frame.bottom - frame.top, project_);
+  // Ensure that basic setup of the controller was successful.
+  if (!flutter_controller_->engine() || !flutter_controller_->view()) {
+    return false;
+  }
+  RegisterPlugins(flutter_controller_->engine());
+  SetChildContent(flutter_controller_->view()->GetNativeWindow());
+
+  flutter_controller_->engine()->SetNextFrameCallback([&]() {
+    this->Show();
+  });
+
+  // Flutter can complete the first frame before the "show window" callback is
+  // registered. The following call ensures a frame is pending to ensure the
+  // window is shown. It is a no-op if the first frame hasn't completed yet.
+  flutter_controller_->ForceRedraw();
+
+  return true;
+}
+
+void FlutterWindow::OnDestroy() {
+  if (flutter_controller_) {
+    flutter_controller_ = nullptr;
+  }
+
+  Win32Window::OnDestroy();
+}
+
+LRESULT
+FlutterWindow::MessageHandler(HWND hwnd, UINT const message,
+                              WPARAM const wparam,
+                              LPARAM const lparam) noexcept {
+  // Give Flutter, including plugins, an opportunity to handle window messages.
+  if (flutter_controller_) {
+    std::optional<LRESULT> result =
+        flutter_controller_->HandleTopLevelWindowProc(hwnd, message, wparam,
+                                                      lparam);
+    if (result) {
+      return *result;
+    }
+  }
+
+  switch (message) {
+    case WM_FONTCHANGE:
+      flutter_controller_->engine()->ReloadSystemFonts();
+      break;
+  }
+
+  return Win32Window::MessageHandler(hwnd, message, wparam, lparam);
+}

example/windows/runner/flutter_window.h

@@ -0,0 +1,33 @@
+#ifndef RUNNER_FLUTTER_WINDOW_H_
+#define RUNNER_FLUTTER_WINDOW_H_
+
+#include <flutter/dart_project.h>
+#include <flutter/flutter_view_controller.h>
+
+#include <memory>
+
+#include "win32_window.h"
+
+// A window that does nothing but host a Flutter view.
+class FlutterWindow : public Win32Window {
+ public:
+  // Creates a new FlutterWindow hosting a Flutter view running |project|.
+  explicit FlutterWindow(const flutter::DartProject& project);
+  virtual ~FlutterWindow();
+
+ protected:
+  // Win32Window:
+  bool OnCreate() override;
+  void OnDestroy() override;
+  LRESULT MessageHandler(HWND window, UINT const message, WPARAM const wparam,
+                         LPARAM const lparam) noexcept override;
+
+ private:
+  // The project to run.
+  flutter::DartProject project_;
+
+  // The Flutter instance hosted by this window.
+  std::unique_ptr<flutter::FlutterViewController> flutter_controller_;
+};
+
+#endif  // RUNNER_FLUTTER_WINDOW_H_

example/windows/runner/main.cpp

@@ -0,0 +1,43 @@
+#include <flutter/dart_project.h>
+#include <flutter/flutter_view_controller.h>
+#include <windows.h>
+
+#include "flutter_window.h"
+#include "utils.h"
+
+int APIENTRY wWinMain(_In_ HINSTANCE instance, _In_opt_ HINSTANCE prev,
+                      _In_ wchar_t *command_line, _In_ int show_command) {
+  // Attach to console when present (e.g., 'flutter run') or create a
+  // new console when running with a debugger.
+  if (!::AttachConsole(ATTACH_PARENT_PROCESS) && ::IsDebuggerPresent()) {
+    CreateAndAttachConsole();
+  }
+
+  // Initialize COM, so that it is available for use in the library and/or
+  // plugins.
+  ::CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED);
+
+  flutter::DartProject project(L"data");
+
+  std::vector<std::string> command_line_arguments =
+      GetCommandLineArguments();
+
+  project.set_dart_entrypoint_arguments(std::move(command_line_arguments));
+
+  FlutterWindow window(project);
+  Win32Window::Point origin(10, 10);
+  Win32Window::Size size(1280, 720);
+  if (!window.Create(L"flutter_stockfish_plugin_example", origin, size)) {
+    return EXIT_FAILURE;
+  }
+  window.SetQuitOnClose(true);
+
+  ::MSG msg;
+  while (::GetMessage(&msg, nullptr, 0, 0)) {
+    ::TranslateMessage(&msg);
+    ::DispatchMessage(&msg);
+  }
+
+  ::CoUninitialize();
+  return EXIT_SUCCESS;
+}

example/windows/runner/resource.h

@@ -0,0 +1,16 @@
+//{{NO_DEPENDENCIES}}
+// Microsoft Visual C++ generated include file.
+// Used by Runner.rc
+//
+#define IDI_APP_ICON                    101
+
+// Next default values for new objects
+//
+#ifdef APSTUDIO_INVOKED
+#ifndef APSTUDIO_READONLY_SYMBOLS
+#define _APS_NEXT_RESOURCE_VALUE        102
+#define _APS_NEXT_COMMAND_VALUE         40001
+#define _APS_NEXT_CONTROL_VALUE         1001
+#define _APS_NEXT_SYMED_VALUE           101
+#endif
+#endif

example/windows/runner/runner.exe.manifest

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+  <application xmlns="urn:schemas-microsoft-com:asm.v3">
+    <windowsSettings>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>
+    </windowsSettings>
+  </application>
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- Windows 10 and Windows 11 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
+      <!-- Windows 8.1 -->
+      <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
+      <!-- Windows 8 -->
+      <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
+      <!-- Windows 7 -->
+      <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>
+    </application>
+  </compatibility>
+</assembly>

example/windows/runner/utils.cpp

@@ -0,0 +1,65 @@
+#include "utils.h"
+
+#include <flutter_windows.h>
+#include <io.h>
+#include <stdio.h>
+#include <windows.h>
+
+#include <iostream>
+
+void CreateAndAttachConsole() {
+  if (::AllocConsole()) {
+    FILE *unused;
+    if (freopen_s(&unused, "CONOUT$", "w", stdout)) {
+      _dup2(_fileno(stdout), 1);
+    }
+    if (freopen_s(&unused, "CONOUT$", "w", stderr)) {
+      _dup2(_fileno(stdout), 2);
+    }
+    std::ios::sync_with_stdio();
+    FlutterDesktopResyncOutputStreams();
+  }
+}
+
+std::vector<std::string> GetCommandLineArguments() {
+  // Convert the UTF-16 command line arguments to UTF-8 for the Engine to use.
+  int argc;
+  wchar_t** argv = ::CommandLineToArgvW(::GetCommandLineW(), &argc);
+  if (argv == nullptr) {
+    return std::vector<std::string>();
+  }
+
+  std::vector<std::string> command_line_arguments;
+
+  // Skip the first argument as it's the binary name.
+  for (int i = 1; i < argc; i++) {
+    command_line_arguments.push_back(Utf8FromUtf16(argv[i]));
+  }
+
+  ::LocalFree(argv);
+
+  return command_line_arguments;
+}
+
+std::string Utf8FromUtf16(const wchar_t* utf16_string) {
+  if (utf16_string == nullptr) {
+    return std::string();
+  }
+  int target_length = ::WideCharToMultiByte(
+      CP_UTF8, WC_ERR_INVALID_CHARS, utf16_string,
+      -1, nullptr, 0, nullptr, nullptr)
+    -1; // remove the trailing null character
+  int input_length = (int)wcslen(utf16_string);
+  std::string utf8_string;
+  if (target_length <= 0 || target_length > utf8_string.max_size()) {
+    return utf8_string;
+  }
+  utf8_string.resize(target_length);
+  int converted_length = ::WideCharToMultiByte(
+      CP_UTF8, WC_ERR_INVALID_CHARS, utf16_string,
+      input_length, utf8_string.data(), target_length, nullptr, nullptr);
+  if (converted_length == 0) {
+    return std::string();
+  }
+  return utf8_string;
+}

example/windows/runner/utils.h

@@ -0,0 +1,19 @@
+#ifndef RUNNER_UTILS_H_
+#define RUNNER_UTILS_H_
+
+#include <string>
+#include <vector>
+
+// Creates a console for the process, and redirects stdout and stderr to
+// it for both the runner and the Flutter library.
+void CreateAndAttachConsole();
+
+// Takes a null-terminated wchar_t* encoded in UTF-16 and returns a std::string
+// encoded in UTF-8. Returns an empty std::string on failure.
+std::string Utf8FromUtf16(const wchar_t* utf16_string);
+
+// Gets the command line arguments passed in as a std::vector<std::string>,
+// encoded in UTF-8. Returns an empty std::vector<std::string> on failure.
+std::vector<std::string> GetCommandLineArguments();
+
+#endif  // RUNNER_UTILS_H_

example/windows/runner/win32_window.cpp

@@ -0,0 +1,288 @@
+#include "win32_window.h"
+
+#include <dwmapi.h>
+#include <flutter_windows.h>
+
+#include "resource.h"
+
+namespace {
+
+/// Window attribute that enables dark mode window decorations.
+///
+/// Redefined in case the developer's machine has a Windows SDK older than
+/// version 10.0.22000.0.
+/// See: https://docs.microsoft.com/windows/win32/api/dwmapi/ne-dwmapi-dwmwindowattribute
+#ifndef DWMWA_USE_IMMERSIVE_DARK_MODE
+#define DWMWA_USE_IMMERSIVE_DARK_MODE 20
+#endif
+
+constexpr const wchar_t kWindowClassName[] = L"FLUTTER_RUNNER_WIN32_WINDOW";
+
+/// Registry key for app theme preference.
+///
+/// A value of 0 indicates apps should use dark mode. A non-zero or missing
+/// value indicates apps should use light mode.
+constexpr const wchar_t kGetPreferredBrightnessRegKey[] =
+  L"Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize";
+constexpr const wchar_t kGetPreferredBrightnessRegValue[] = L"AppsUseLightTheme";
+
+// The number of Win32Window objects that currently exist.
+static int g_active_window_count = 0;
+
+using EnableNonClientDpiScaling = BOOL __stdcall(HWND hwnd);
+
+// Scale helper to convert logical scaler values to physical using passed in
+// scale factor
+int Scale(int source, double scale_factor) {
+  return static_cast<int>(source * scale_factor);
+}
+
+// Dynamically loads the |EnableNonClientDpiScaling| from the User32 module.
+// This API is only needed for PerMonitor V1 awareness mode.
+void EnableFullDpiSupportIfAvailable(HWND hwnd) {
+  HMODULE user32_module = LoadLibraryA("User32.dll");
+  if (!user32_module) {
+    return;
+  }
+  auto enable_non_client_dpi_scaling =
+      reinterpret_cast<EnableNonClientDpiScaling*>(
+          GetProcAddress(user32_module, "EnableNonClientDpiScaling"));
+  if (enable_non_client_dpi_scaling != nullptr) {
+    enable_non_client_dpi_scaling(hwnd);
+  }
+  FreeLibrary(user32_module);
+}
+
+}  // namespace
+
+// Manages the Win32Window's window class registration.
+class WindowClassRegistrar {
+ public:
+  ~WindowClassRegistrar() = default;
+
+  // Returns the singleton registrar instance.
+  static WindowClassRegistrar* GetInstance() {
+    if (!instance_) {
+      instance_ = new WindowClassRegistrar();
+    }
+    return instance_;
+  }
+
+  // Returns the name of the window class, registering the class if it hasn't
+  // previously been registered.
+  const wchar_t* GetWindowClass();
+
+  // Unregisters the window class. Should only be called if there are no
+  // instances of the window.
+  void UnregisterWindowClass();
+
+ private:
+  WindowClassRegistrar() = default;
+
+  static WindowClassRegistrar* instance_;
+
+  bool class_registered_ = false;
+};
+
+WindowClassRegistrar* WindowClassRegistrar::instance_ = nullptr;
+
+const wchar_t* WindowClassRegistrar::GetWindowClass() {
+  if (!class_registered_) {
+    WNDCLASS window_class{};
+    window_class.hCursor = LoadCursor(nullptr, IDC_ARROW);
+    window_class.lpszClassName = kWindowClassName;
+    window_class.style = CS_HREDRAW | CS_VREDRAW;
+    window_class.cbClsExtra = 0;
+    window_class.cbWndExtra = 0;
+    window_class.hInstance = GetModuleHandle(nullptr);
+    window_class.hIcon =
+        LoadIcon(window_class.hInstance, MAKEINTRESOURCE(IDI_APP_ICON));
+    window_class.hbrBackground = 0;
+    window_class.lpszMenuName = nullptr;
+    window_class.lpfnWndProc = Win32Window::WndProc;
+    RegisterClass(&window_class);
+    class_registered_ = true;
+  }
+  return kWindowClassName;
+}
+
+void WindowClassRegistrar::UnregisterWindowClass() {
+  UnregisterClass(kWindowClassName, nullptr);
+  class_registered_ = false;
+}
+
+Win32Window::Win32Window() {
+  ++g_active_window_count;
+}
+
+Win32Window::~Win32Window() {
+  --g_active_window_count;
+  Destroy();
+}
+
+bool Win32Window::Create(const std::wstring& title,
+                         const Point& origin,
+                         const Size& size) {
+  Destroy();
+
+  const wchar_t* window_class =
+      WindowClassRegistrar::GetInstance()->GetWindowClass();
+
+  const POINT target_point = {static_cast<LONG>(origin.x),
+                              static_cast<LONG>(origin.y)};
+  HMONITOR monitor = MonitorFromPoint(target_point, MONITOR_DEFAULTTONEAREST);
+  UINT dpi = FlutterDesktopGetDpiForMonitor(monitor);
+  double scale_factor = dpi / 96.0;
+
+  HWND window = CreateWindow(
+      window_class, title.c_str(), WS_OVERLAPPEDWINDOW,
+      Scale(origin.x, scale_factor), Scale(origin.y, scale_factor),
+      Scale(size.width, scale_factor), Scale(size.height, scale_factor),
+      nullptr, nullptr, GetModuleHandle(nullptr), this);
+
+  if (!window) {
+    return false;
+  }
+
+  UpdateTheme(window);
+
+  return OnCreate();
+}
+
+bool Win32Window::Show() {
+  return ShowWindow(window_handle_, SW_SHOWNORMAL);
+}
+
+// static
+LRESULT CALLBACK Win32Window::WndProc(HWND const window,
+                                      UINT const message,
+                                      WPARAM const wparam,
+                                      LPARAM const lparam) noexcept {
+  if (message == WM_NCCREATE) {
+    auto window_struct = reinterpret_cast<CREATESTRUCT*>(lparam);
+    SetWindowLongPtr(window, GWLP_USERDATA,
+                     reinterpret_cast<LONG_PTR>(window_struct->lpCreateParams));
+
+    auto that = static_cast<Win32Window*>(window_struct->lpCreateParams);
+    EnableFullDpiSupportIfAvailable(window);
+    that->window_handle_ = window;
+  } else if (Win32Window* that = GetThisFromHandle(window)) {
+    return that->MessageHandler(window, message, wparam, lparam);
+  }
+
+  return DefWindowProc(window, message, wparam, lparam);
+}
+
+LRESULT
+Win32Window::MessageHandler(HWND hwnd,
+                            UINT const message,
+                            WPARAM const wparam,
+                            LPARAM const lparam) noexcept {
+  switch (message) {
+    case WM_DESTROY:
+      window_handle_ = nullptr;
+      Destroy();
+      if (quit_on_close_) {
+        PostQuitMessage(0);
+      }
+      return 0;
+
+    case WM_DPICHANGED: {
+      auto newRectSize = reinterpret_cast<RECT*>(lparam);
+      LONG newWidth = newRectSize->right - newRectSize->left;
+      LONG newHeight = newRectSize->bottom - newRectSize->top;
+
+      SetWindowPos(hwnd, nullptr, newRectSize->left, newRectSize->top, newWidth,
+                   newHeight, SWP_NOZORDER | SWP_NOACTIVATE);
+
+      return 0;
+    }
+    case WM_SIZE: {
+      RECT rect = GetClientArea();
+      if (child_content_ != nullptr) {
+        // Size and position the child window.
+        MoveWindow(child_content_, rect.left, rect.top, rect.right - rect.left,
+                   rect.bottom - rect.top, TRUE);
+      }
+      return 0;
+    }
+
+    case WM_ACTIVATE:
+      if (child_content_ != nullptr) {
+        SetFocus(child_content_);
+      }
+      return 0;
+
+    case WM_DWMCOLORIZATIONCOLORCHANGED:
+      UpdateTheme(hwnd);
+      return 0;
+  }
+
+  return DefWindowProc(window_handle_, message, wparam, lparam);
+}
+
+void Win32Window::Destroy() {
+  OnDestroy();
+
+  if (window_handle_) {
+    DestroyWindow(window_handle_);
+    window_handle_ = nullptr;
+  }
+  if (g_active_window_count == 0) {
+    WindowClassRegistrar::GetInstance()->UnregisterWindowClass();
+  }
+}
+
+Win32Window* Win32Window::GetThisFromHandle(HWND const window) noexcept {
+  return reinterpret_cast<Win32Window*>(
+      GetWindowLongPtr(window, GWLP_USERDATA));
+}
+
+void Win32Window::SetChildContent(HWND content) {
+  child_content_ = content;
+  SetParent(content, window_handle_);
+  RECT frame = GetClientArea();
+
+  MoveWindow(content, frame.left, frame.top, frame.right - frame.left,
+             frame.bottom - frame.top, true);
+
+  SetFocus(child_content_);
+}
+
+RECT Win32Window::GetClientArea() {
+  RECT frame;
+  GetClientRect(window_handle_, &frame);
+  return frame;
+}
+
+HWND Win32Window::GetHandle() {
+  return window_handle_;
+}
+
+void Win32Window::SetQuitOnClose(bool quit_on_close) {
+  quit_on_close_ = quit_on_close;
+}
+
+bool Win32Window::OnCreate() {
+  // No-op; provided for subclasses.
+  return true;
+}
+
+void Win32Window::OnDestroy() {
+  // No-op; provided for subclasses.
+}
+
+void Win32Window::UpdateTheme(HWND const window) {
+  DWORD light_mode;
+  DWORD light_mode_size = sizeof(light_mode);
+  LSTATUS result = RegGetValue(HKEY_CURRENT_USER, kGetPreferredBrightnessRegKey,
+                               kGetPreferredBrightnessRegValue,
+                               RRF_RT_REG_DWORD, nullptr, &light_mode,
+                               &light_mode_size);
+
+  if (result == ERROR_SUCCESS) {
+    BOOL enable_dark_mode = light_mode == 0;
+    DwmSetWindowAttribute(window, DWMWA_USE_IMMERSIVE_DARK_MODE,
+                          &enable_dark_mode, sizeof(enable_dark_mode));
+  }
+}

example/windows/runner/win32_window.h

@@ -0,0 +1,102 @@
+#ifndef RUNNER_WIN32_WINDOW_H_
+#define RUNNER_WIN32_WINDOW_H_
+
+#include <windows.h>
+
+#include <functional>
+#include <memory>
+#include <string>
+
+// A class abstraction for a high DPI-aware Win32 Window. Intended to be
+// inherited from by classes that wish to specialize with custom
+// rendering and input handling
+class Win32Window {
+ public:
+  struct Point {
+    unsigned int x;
+    unsigned int y;
+    Point(unsigned int x, unsigned int y) : x(x), y(y) {}
+  };
+
+  struct Size {
+    unsigned int width;
+    unsigned int height;
+    Size(unsigned int width, unsigned int height)
+        : width(width), height(height) {}
+  };
+
+  Win32Window();
+  virtual ~Win32Window();
+
+  // Creates a win32 window with |title| that is positioned and sized using
+  // |origin| and |size|. New windows are created on the default monitor. Window
+  // sizes are specified to the OS in physical pixels, hence to ensure a
+  // consistent size this function will scale the inputted width and height as
+  // as appropriate for the default monitor. The window is invisible until
+  // |Show| is called. Returns true if the window was created successfully.
+  bool Create(const std::wstring& title, const Point& origin, const Size& size);
+
+  // Show the current window. Returns true if the window was successfully shown.
+  bool Show();
+
+  // Release OS resources associated with window.
+  void Destroy();
+
+  // Inserts |content| into the window tree.
+  void SetChildContent(HWND content);
+
+  // Returns the backing Window handle to enable clients to set icon and other
+  // window properties. Returns nullptr if the window has been destroyed.
+  HWND GetHandle();
+
+  // If true, closing this window will quit the application.
+  void SetQuitOnClose(bool quit_on_close);
+
+  // Return a RECT representing the bounds of the current client area.
+  RECT GetClientArea();
+
+ protected:
+  // Processes and route salient window messages for mouse handling,
+  // size change and DPI. Delegates handling of these to member overloads that
+  // inheriting classes can handle.
+  virtual LRESULT MessageHandler(HWND window,
+                                 UINT const message,
+                                 WPARAM const wparam,
+                                 LPARAM const lparam) noexcept;
+
+  // Called when CreateAndShow is called, allowing subclass window-related
+  // setup. Subclasses should return false if setup fails.
+  virtual bool OnCreate();
+
+  // Called when Destroy is called.
+  virtual void OnDestroy();
+
+ private:
+  friend class WindowClassRegistrar;
+
+  // OS callback called by message pump. Handles the WM_NCCREATE message which
+  // is passed when the non-client area is being created and enables automatic
+  // non-client DPI scaling so that the non-client area automatically
+  // responds to changes in DPI. All other messages are handled by
+  // MessageHandler.
+  static LRESULT CALLBACK WndProc(HWND const window,
+                                  UINT const message,
+                                  WPARAM const wparam,
+                                  LPARAM const lparam) noexcept;
+
+  // Retrieves a class instance pointer for |window|
+  static Win32Window* GetThisFromHandle(HWND const window) noexcept;
+
+  // Update the window frame's theme to match the system theme.
+  static void UpdateTheme(HWND const window);
+
+  bool quit_on_close_ = false;
+
+  // window handle for top level window.
+  HWND window_handle_ = nullptr;
+
+  // window handle for hosted content.
+  HWND child_content_ = nullptr;
+};
+
+#endif  // RUNNER_WIN32_WINDOW_H_

ffigen.yaml

@@ -1,15 +1,15 @@
 # Run with `flutter pub run ffigen --config ffigen_linux.yaml`.
-name: StockfishChessEngineBindings
+name: StockfishChessEngineCBindings
 description: |
   Bindings for `src/stockfish.h`.
 
   Regenerate bindings with `dart run ffigen --config ffigen.yaml`.
-output: 'lib/stockfish_bindings_generated.dart'
+output: "lib/stockfish_c_bindings_generated.dart"
 headers:
   entry-points:
-    - 'src/stockfish.h'
+    - "src/stockfish.h"
   include-directives:
-    - 'src/stockfish.h'
+    - "src/stockfish.h"
 preamble: |
   // ignore_for_file: always_specify_types
   // ignore_for_file: camel_case_types
@@ -17,5 +17,5 @@ preamble: |
 comments:
   style: any
   length: full
-llvm-path:
+#llvm-path:
-  - /usr/lib/llvm-14
+#  - /usr/lib/llvm-14

lib/stockfish.dart

@@ -1,89 +1,35 @@
-// Using code from https://github.com/ArjanAswal/Stockfish/blob/master/lib/src/stockfish.dart
-
 import 'dart:async';
-import 'dart:ffi';
-import 'dart:io';
-import 'dart:convert';
-import 'dart:isolate';
-import 'dart:developer' as developer;
 
 import 'package:flutter/foundation.dart';
-import 'package:ffi/ffi.dart';
+import 'package:flutter_stockfish_plugin/stockfish_bindings.dart';
+import 'package:flutter_stockfish_plugin/stockfish_native_bindings.dart'
+    if (dart.library.html) 'package:flutter_stockfish_plugin/stockfish_web_bindings.dart';
+import 'package:flutter_stockfish_plugin/stockfish_state.dart';
 
-import 'stockfish_bindings_generated.dart';
-import 'stockfish_state.dart';
-
-const String _libName = 'flutter_stockfish_plugin';
-//const String _releaseType = kDebugMode ? 'Debug' : 'Release';
-
-/// The dynamic library in which the symbols for [StockfishChessEngineBindings] can be found.
-final DynamicLibrary _dylib = () {
-  if (Platform.isMacOS || Platform.isIOS) {
-    return DynamicLibrary.open('$_libName.framework/$_libName');
-  }
-  if (Platform.isAndroid || Platform.isLinux) {
-    return DynamicLibrary.open('lib$_libName.so');
-  }
-  if (Platform.isWindows) {
-    return DynamicLibrary.open('$_libName.dll');
-  }
-  /*if (Platform.isLinux) {
-    return DynamicLibrary.open(
-        '${File(Platform.resolvedExecutable).parent.parent.path}/plugins/flutter_stockfish_plugin/shared/lib$_libName.so');
-  }
-  if (Platform.isWindows) {
-    return DynamicLibrary.open(
-        '${File(Platform.resolvedExecutable).parent.parent.parent.path}/plugins/flutter_stockfish_plugin/shared/$_releaseType/$_libName.dll');
-  }*/
-  throw UnsupportedError('Unknown platform: ${Platform.operatingSystem}');
-}();
-
-/// The bindings to the native functions in [_dylib].
-final StockfishChessEngineBindings _bindings =
-    StockfishChessEngineBindings(_dylib);
-
-/// A wrapper for C++ engine.
 class Stockfish {
-  final Completer<Stockfish>? completer;
+  final _state = StockfishStateClass();
+  final StockfishChessEngineAbstractBindings _bindings =
+      StockfishChessEngineBindings();
 
-  final _state = _StockfishState();
+  Stockfish._({Completer<Stockfish>? completer}) {
-  final _stdoutController = StreamController<String>.broadcast();
+    _state.setValue(StockfishState.starting);
-  final _mainPort = ReceivePort();
+    _bindings.stockfishMain(() {
-  final _stdoutPort = ReceivePort();
+      _state.setValue(StockfishState.ready);
-
-  late StreamSubscription _mainSubscription;
-  late StreamSubscription _stdoutSubscription;
-
-  Stockfish._({this.completer}) {
-    _mainSubscription =
-        _mainPort.listen((message) => _cleanUp(message is int ? message : 1));
-    _stdoutSubscription = _stdoutPort.listen((message) {
-      if (message is String) {
-        _stdoutController.sink.add(message);
-      } else {
-        developer.log('The stdout isolate sent $message', name: 'Stockfish');
-      }
-    });
-    compute(_spawnIsolates, [_mainPort.sendPort, _stdoutPort.sendPort]).then(
-      (success) {
-        final state = success ? StockfishState.ready : StockfishState.error;
-        _state._setValue(state);
-        if (state == StockfishState.ready) {
       completer?.complete(this);
-        }
+    }).then((exitCode) {
-      },
+      _state.setValue(
-      onError: (error) {
+          exitCode == 0 ? StockfishState.disposed : StockfishState.error);
-        print('The init isolate encountered an error $error');
+      _instance = null;
-        developer.log('The init isolate encountered an error $error',
+    }, onError: (error) {
-            name: 'Stockfish');
+      _state.setValue(StockfishState.error);
-        _cleanUp(1);
+      _instance = null;
-      },
+      completer?.completeError(error);
-    );
+    });
   }
 
   static Stockfish? _instance;
 
-  /// Creates a C++ engine.
+  /// Creates the stockfish engine.
   ///
   /// This may throws a [StateError] if an active instance is being used.
   /// Owner must [dispose] it before a new instance can be created.
@@ -91,54 +37,35 @@ class Stockfish {
     if (_instance != null) {
       throw StateError('Multiple instances are not supported, yet.');
     }
-
     _instance = Stockfish._();
     return _instance!;
   }
 
-  /// The current state of the underlying C++ engine.
+  /// The current state of the underlying stockfish engine.
   ValueListenable<StockfishState> get state => _state;
 
   /// The standard output stream.
-  Stream<String> get stdout => _stdoutController.stream;
+  Stream<String> get stdout => _bindings.read;
 
   /// The standard input sink.
   set stdin(String line) {
-    final stateValue = _state.value;
+    final stateValue = state.value;
     if (stateValue != StockfishState.ready) {
       throw StateError('Stockfish is not ready ($stateValue)');
     }
-
+    _bindings.write(line);
-    print("sending: " + line);
-
-    final unicodePointer = '$line\n'.toNativeUtf8();
-    final pointer = unicodePointer.cast<Char>();
-    _bindings.stockfish_stdin_write(pointer);
-    calloc.free(unicodePointer);
   }
 
-  /// Stops the C++ engine.
+  /// Stops the stockfish engine.
   void dispose() {
-    final stateValue = _state.value;
+    final stateValue = state.value;
     if (stateValue == StockfishState.ready) {
       stdin = 'quit';
     }
   }
-
-  void _cleanUp(int exitCode) {
-    _stdoutController.close();
-
-    _mainSubscription.cancel();
-    _stdoutSubscription.cancel();
-
-    _state._setValue(
-        exitCode == 0 ? StockfishState.disposed : StockfishState.error);
-
-    _instance = null;
-  }
 }
 
-/// Creates a C++ engine asynchronously.
+/// Creates the stockfish engine asynchronously.
 ///
 /// This method is different from the factory method [Stockfish] that
 /// it will wait for the engine to be ready before returning the instance.
@@ -151,80 +78,3 @@ Future<Stockfish> stockfishAsync() {
   Stockfish._instance = Stockfish._(completer: completer);
   return completer.future;
 }
-
-class _StockfishState extends ChangeNotifier
-    implements ValueListenable<StockfishState> {
-  StockfishState _value = StockfishState.starting;
-
-  @override
-  StockfishState get value => _value;
-
-  _setValue(StockfishState v) {
-    if (v == _value) return;
-    _value = v;
-    notifyListeners();
-  }
-}
-
-void _isolateMain(SendPort mainPort) {
-  final exitCode = _bindings.stockfish_main();
-  mainPort.send(exitCode);
-
-  developer.log('nativeMain returns $exitCode', name: 'Stockfish');
-}
-
-void _isolateStdout(SendPort stdoutPort) {
-  String previous = '';
-
-  while (true) {
-    final pointer = _bindings.stockfish_stdout_read();
-
-    if (pointer.address == 0) {
-      developer.log('nativeStdoutRead returns NULL', name: 'Stockfish');
-      return;
-    }
-
-    Uint8List newContentCharList;
-
-    final newContentLength = pointer.cast<Utf8>().length;
-    newContentCharList = Uint8List.view(
-        pointer.cast<Uint8>().asTypedList(newContentLength).buffer,
-        0,
-        newContentLength);
-
-    final newContent = utf8.decode(newContentCharList);
-
-    final data = previous + newContent;
-    final lines = data.split('\n');
-    previous = lines.removeLast();
-    for (final line in lines) {
-      stdoutPort.send(line);
-    }
-  }
-}
-
-Future<bool> _spawnIsolates(List<SendPort> mainAndStdout) async {
-  final initResult = _bindings.stockfish_init();
-  if (initResult != 0) {
-    developer.log('initResult=$initResult', name: 'Stockfish');
-    return false;
-  }
-
-  try {
-    await Isolate.spawn(_isolateStdout, mainAndStdout[1]);
-  } catch (error) {
-    print('Failed to spawn stdout isolate: $error');
-    developer.log('Failed to spawn stdout isolate: $error', name: 'Stockfish');
-    return false;
-  }
-
-  try {
-    await Isolate.spawn(_isolateMain, mainAndStdout[0]);
-  } catch (error) {
-    print('Failed to spawn stdout isolate: $error');
-    developer.log('Failed to spawn main isolate: $error', name: 'Stockfish');
-    return false;
-  }
-
-  return true;
-}

lib/stockfish_bindings.dart

@@ -0,0 +1,9 @@
+import 'dart:async';
+
+abstract class StockfishChessEngineAbstractBindings {
+  final stdoutController = StreamController<String>.broadcast();
+  Future<int> stockfishMain(Function active);
+  void cleanUp(int exitCode);
+  void write(String line);
+  Stream<String> get read => stdoutController.stream;
+}

lib/stockfish_c_bindings_generated.dart

@@ -5,23 +5,24 @@
 // AUTO GENERATED FILE, DO NOT EDIT.
 //
 // Generated by `package:ffigen`.
+// ignore_for_file: type=lint
 import 'dart:ffi' as ffi;
 
 /// Bindings for `src/stockfish.h`.
 ///
 /// Regenerate bindings with `dart run ffigen --config ffigen.yaml`.
 ///
-class StockfishChessEngineBindings {
+class StockfishChessEngineCBindings {
   /// Holds the symbol lookup function.
   final ffi.Pointer<T> Function<T extends ffi.NativeType>(String symbolName)
       _lookup;
 
   /// The symbols are looked up in [dynamicLibrary].
-  StockfishChessEngineBindings(ffi.DynamicLibrary dynamicLibrary)
+  StockfishChessEngineCBindings(ffi.DynamicLibrary dynamicLibrary)
       : _lookup = dynamicLibrary.lookup;
 
   /// The symbols are looked up with [lookup].
-  StockfishChessEngineBindings.fromLookup(
+  StockfishChessEngineCBindings.fromLookup(
       ffi.Pointer<T> Function<T extends ffi.NativeType>(String symbolName)
           lookup)
       : _lookup = lookup;
@@ -42,6 +43,25 @@ class StockfishChessEngineBindings {
       _lookup<ffi.NativeFunction<ffi.Int Function()>>('stockfish_main');
   late final _stockfish_main = _stockfish_mainPtr.asFunction<int Function()>();
 
+  void stockfish_start_main() {
+    return _stockfish_start_main();
+  }
+
+  late final _stockfish_start_mainPtr =
+      _lookup<ffi.NativeFunction<ffi.Void Function()>>('stockfish_start_main');
+  late final _stockfish_start_main =
+      _stockfish_start_mainPtr.asFunction<void Function()>();
+
+  int stockfish_last_main_state() {
+    return _stockfish_last_main_state();
+  }
+
+  late final _stockfish_last_main_statePtr =
+      _lookup<ffi.NativeFunction<ffi.Int Function()>>(
+          'stockfish_last_main_state');
+  late final _stockfish_last_main_state =
+      _stockfish_last_main_statePtr.asFunction<int Function()>();
+
   int stockfish_stdin_write(
     ffi.Pointer<ffi.Char> data,
   ) {
@@ -56,16 +76,21 @@ class StockfishChessEngineBindings {
   late final _stockfish_stdin_write = _stockfish_stdin_writePtr
       .asFunction<int Function(ffi.Pointer<ffi.Char>)>();
 
-  ffi.Pointer<ffi.Char> stockfish_stdout_read() {
+  ffi.Pointer<ffi.Char> stockfish_stdout_read(
-    return _stockfish_stdout_read();
+    int trygetline,
+  ) {
+    return _stockfish_stdout_read(
+      trygetline,
+    );
   }
 
   late final _stockfish_stdout_readPtr =
-      _lookup<ffi.NativeFunction<ffi.Pointer<ffi.Char> Function()>>(
+      _lookup<ffi.NativeFunction<ffi.Pointer<ffi.Char> Function(ffi.Int)>>(
           'stockfish_stdout_read');
-  late final _stockfish_stdout_read =
+  late final _stockfish_stdout_read = _stockfish_stdout_readPtr
-      _stockfish_stdout_readPtr.asFunction<ffi.Pointer<ffi.Char> Function()>();
+      .asFunction<ffi.Pointer<ffi.Char> Function(int)>();
 }
 
 typedef ssize_t = __ssize_t;
 typedef __ssize_t = ffi.Long;
+typedef Dart__ssize_t = int;

lib/stockfish_native_bindings.dart

@@ -0,0 +1,149 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:ffi';
+import 'dart:io';
+import 'dart:isolate';
+import 'dart:developer' as developer;
+
+import 'package:ffi/ffi.dart';
+import 'package:flutter/foundation.dart';
+
+import 'package:flutter_stockfish_plugin/stockfish_bindings.dart';
+import 'package:flutter_stockfish_plugin/stockfish_c_bindings_generated.dart';
+
+const String _libName = 'flutter_stockfish_plugin';
+
+/// The dynamic library in which the symbols for [StockfishChessEngineCBindings] can be found.
+final DynamicLibrary _dylib = () {
+  if (Platform.isMacOS || Platform.isIOS) {
+    return DynamicLibrary.open('$_libName.framework/$_libName');
+  }
+  if (Platform.isAndroid || Platform.isLinux) {
+    return DynamicLibrary.open('lib$_libName.so');
+  }
+  if (Platform.isWindows) {
+    return DynamicLibrary.open('$_libName.dll');
+  }
+  throw UnsupportedError('Unknown platform: ${Platform.operatingSystem}');
+}();
+
+/// The bindings to the native functions in [_dylib].
+final StockfishChessEngineCBindings _bindings =
+    StockfishChessEngineCBindings(_dylib);
+
+class StockfishChessEngineBindings
+    extends StockfishChessEngineAbstractBindings {
+  final _mainPort = ReceivePort();
+  final _stdoutPort = ReceivePort();
+  late StreamSubscription _mainSubscription;
+  late StreamSubscription _stdoutSubscription;
+
+  @override
+  Future<int> stockfishMain(Function active) {
+    final completer = Completer<int>();
+    _mainSubscription = _mainPort.listen((message) {
+      cleanUp(message is int ? message : 1);
+      completer.complete(message is int ? message : 1);
+    });
+    _stdoutSubscription = _stdoutPort.listen((message) {
+      if (message is String) {
+        stdoutController.sink.add(message);
+      } else {
+        developer.log('The stdout isolate sent $message', name: 'Stockfish');
+      }
+    });
+    compute(_spawnIsolates, [_mainPort.sendPort, _stdoutPort.sendPort]).then(
+      (success) {
+        if (success) {
+          active();
+        } else {
+          completer.completeError('Unable to create Isolates');
+          cleanUp(1);
+        }
+      },
+      onError: (error) {
+        developer.log('The init isolate encountered an error $error',
+            name: 'Stockfish');
+        completer.completeError(error);
+        cleanUp(1);
+      },
+    );
+    return completer.future;
+  }
+
+  @override
+  void write(String line) {
+    final unicodePointer = '$line\n'.toNativeUtf8();
+    final pointer = unicodePointer.cast<Char>();
+    _bindings.stockfish_stdin_write(pointer);
+    calloc.free(unicodePointer);
+  }
+
+  @override
+  void cleanUp(int exitCode) {
+    stdoutController.close();
+    _mainSubscription.cancel();
+    _stdoutSubscription.cancel();
+  }
+}
+
+void _isolateMain(SendPort mainPort) {
+  final exitCode = _bindings.stockfish_main();
+  mainPort.send(exitCode);
+
+  developer.log('nativeMain returns $exitCode', name: 'Stockfish');
+}
+
+void _isolateStdout(SendPort stdoutPort) {
+  String previous = '';
+
+  while (true) {
+    final pointer = _bindings.stockfish_stdout_read(0);
+
+    if (pointer.address == 0) {
+      developer.log('nativeStdoutRead returns NULL', name: 'Stockfish');
+      return;
+    }
+
+    Uint8List newContentCharList;
+
+    final newContentLength = pointer.cast<Utf8>().length;
+    newContentCharList = Uint8List.view(
+        pointer.cast<Uint8>().asTypedList(newContentLength).buffer,
+        0,
+        newContentLength);
+
+    final newContent = utf8.decode(newContentCharList);
+
+    final data = previous + newContent;
+    final lines = data.split('\n');
+    previous = lines.removeLast();
+    for (final line in lines) {
+      stdoutPort.send(line);
+    }
+  }
+}
+
+Future<bool> _spawnIsolates(List<SendPort> mainAndStdout) async {
+  final initResult = _bindings.stockfish_init();
+  if (initResult != 0) {
+    developer.log('initResult=$initResult', name: 'Stockfish');
+    return false;
+  }
+
+  try {
+    await Isolate.spawn(_isolateStdout, mainAndStdout[1]);
+  } catch (error) {
+    developer.log('Failed to spawn stdout isolate: $error', name: 'Stockfish');
+    return false;
+  }
+
+  try {
+    await Isolate.spawn(_isolateMain, mainAndStdout[0]);
+  } catch (error) {
+    developer.log('Failed to spawn main isolate: $error', name: 'Stockfish');
+    return false;
+  }
+
+  return true;
+}

lib/stockfish_state.dart

@@ -1,4 +1,20 @@
-// Taken from https://github.com/ArjanAswal/Stockfish/blob/master/lib/src/stockfish_state.dart
+import 'package:flutter/foundation.dart';
+
+class StockfishStateClass extends ChangeNotifier
+    implements ValueListenable<StockfishState> {
+  StockfishState _value = StockfishState.starting;
+
+  @override
+  StockfishState get value => _value;
+
+  setValue(StockfishState v) {
+    if (v == _value) return;
+    _value = v;
+    notifyListeners();
+  }
+}
+
+// The following is taken from https://github.com/ArjanAswal/Stockfish/blob/master/lib/src/stockfish_state.dart
 
 /// C++ engine state.
 enum StockfishState {

lib/stockfish_web_bindings.dart

@@ -0,0 +1,76 @@
+// ignore_for_file: avoid_web_libraries_in_flutter
+
+import 'dart:async';
+import 'dart:js' as js;
+import 'dart:html' as html;
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter_stockfish_plugin/stockfish_bindings.dart';
+
+const jsPath = "stockfish/";
+
+class StockfishChessEngineBindings
+    extends StockfishChessEngineAbstractBindings {
+  Future<void>? loadJs;
+  StockfishChessEngineBindings() {
+    loadJs = loadJsFileIfNeeded();
+  }
+
+  @override
+  void cleanUp(int exitCode) {
+    stdoutController.close();
+    js.context.callMethod("stop_listening", []);
+  }
+
+  @override
+  Future<int> stockfishMain(Function active) async {
+    if (loadJs != null) {
+      await loadJs;
+      loadJs = null;
+    }
+    final completer = Completer<int>();
+    js.context.callMethod("start_listening", [
+      (line) => stdoutController.sink.add(line),
+      (state) {
+        cleanUp(state is int ? state : 1);
+        completer.complete(state is int ? state : 1);
+      }
+    ]);
+    active();
+    return completer.future;
+  }
+
+  @override
+  void write(String line) {
+    js.context.callMethod("write", [line]);
+  }
+}
+
+bool _jsloaded = false;
+
+Future<void> loadJsFileIfNeeded() async {
+  if (kIsWeb && !_jsloaded) {
+    final stockfishScript = html.document.createElement("script");
+    stockfishScript.setAttribute("src", "${jsPath}flutter_stockfish_plugin.js");
+    html.document.head?.append(stockfishScript);
+
+    await stockfishScript.onLoad.first;
+
+    final jsBindingsScript = html.document.createElement("script");
+    jsBindingsScript.setAttribute("src", "${jsPath}js_bindings.js");
+    html.document.head?.append(jsBindingsScript);
+
+    await jsBindingsScript.onLoad.first;
+
+    _jsloaded = true;
+  }
+  await _stockfishWaitReady();
+}
+
+Future<dynamic> _stockfishWaitReady() {
+  final completer = Completer<dynamic>();
+  js.context.callMethod('wait_ready', [
+    completer.complete,
+  ]);
+  return completer.future;
+}

linux/CMakeLists.txt

@@ -9,7 +9,6 @@ project(${PROJECT_NAME} LANGUAGES CXX)
 
 # Invoke the build for native code shared with the other target platforms.
 # This can be changed to accomodate different builds.
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -march=native")
 
 add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/../src" "${CMAKE_CURRENT_BINARY_DIR}/shared")
 

pubspec.yaml

@@ -1,11 +1,11 @@
 name: flutter_stockfish_plugin
 description: "A Stockfish Plugin for Flutter. Use Stockfish 16 directly in your flutter app."
-version: 1.0.1
+version: 1.1.0
 homepage: https://github.com/jusax23/flutter_stockfish_plugin
 
 environment:
-  sdk: '>=2.17.1 <4.0.0'
+  sdk: ">=3.1.3 <4.0.0"
-  flutter: '>=3.3.0'
+  flutter: ">=3.3.0"
 
 dependencies:
   ffi: ^2.1.0
@@ -16,8 +16,9 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  flutter_lints: ^2.0.0
+  flutter_lints: ^3.0.1
-  ffigen: ^9.0.1
+  ffigen: ^11.0.0
+  test: ^1.24.9
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec
@@ -42,8 +43,14 @@ flutter:
         ffiPlugin: true
       windows:
         ffiPlugin: true
+      web:
     # -------------------
-
+  #assets:
+  #  - web/js_bindings.js
+  #  - web/stockfish_data.bin
+  #  - web/flutter_stockfish_plugin.js
+  #  - web/flutter_stockfish_plugin.wasm
+  #  - web/flutter_stockfish_plugin.worker.js
   # To add assets to your plugin package, add an assets section, like this:
   # assets:
   #   - images/a_dot_burr.jpeg

src/CMakeLists.txt

@@ -6,12 +6,58 @@ cmake_minimum_required(VERSION 3.18)
 project(flutter_stockfish_plugin VERSION 0.0.1 LANGUAGES CXX)
 file(GLOB_RECURSE cppPaths "Stockfish/src/*.cpp")
 set(CMAKE_CXX_STANDARD 17)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 -O3 -flto") #-DNDEBUG -fno-exceptions -funroll-loops
+
+if(MSVC)
+  set(COMMON_FLAGS "/std:c++17 /LTCG")
+
+  set(SIMD_FLAGS "/arch:AVX2 /DUSE_POPCNT /arch:SSE /DUSE_SSE2 /DUSE_SSSE3 /DUSE_SSE41")
+
+  if (CMAKE_SIZEOF_VOID_P EQUAL 8)
+    message(STATUS "Adding x86_64 specific flags")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${COMMON_FLAGS} ${SIMD_FLAGS}")
+  elseif(CMAKE_SIZEOF_VOID_P EQUAL 4)
+    message(STATUS "Adding x86 specific flags")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${COMMON_FLAGS} ${SIMD_FLAGS}")
+  endif()
+
+    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /Od /Zi")
+
+    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Ox /DNDEBUG")
+
+else()
+  set(COMMON_FLAGS "-Wall -Wcast-qual -Wno-main -fno-exceptions -std=c++17 -pedantic -Wextra -Wshadow -Wmissing-declarations -flto -DUSE_PTHREADS") 
+
+  set(SIMD_FLAGS "-mpopcnt -DUSE_POPCNT -mavx -msse -DUSE_SSE2 -msse2 -msse3 -DUSE_SSSE3 -mssse3 -DUSE_SSE41 -msse4.1 -DUSE_SSE42 -msse4.2")
+
+  if (CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64")
+    message(STATUS "Adding x86_64 specific flags")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${COMMON_FLAGS} ${SIMD_FLAGS} -m64 -DIS_64BIT -DUSE_PTHREADS")
+  elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "x86")
+    message(STATUS "Adding x86 specific flags")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${COMMON_FLAGS} ${SIMD_FLAGS}")
+  elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "armv8")
+    message(STATUS "Adding armv8 specific flags")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${COMMON_FLAGS} -DIS_64BIT -DUSE_POPCNT -DUSE_NEON=8")
+  elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "armv7")
+    message(STATUS "Adding armv7 specific flags")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${COMMON_FLAGS}")
+  elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64")
+    message(STATUS "Adding aarch64 specific flags")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${COMMON_FLAGS} -DIS_64BIT -DNO_PREFETCH")
+  endif()
+
+  set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O0 -g")
+
+  set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3 -DNDEBUG")
+endif()
+
+
 set(NNUE_NAME nn-5af11540bbfe.nnue)
 
 add_library(flutter_stockfish_plugin SHARED
   "stockfish.cpp"
   "stream_fix.cpp"
+  "small_fixes.cpp"
   ${cppPaths}
 )
 
@@ -21,9 +67,9 @@ set_target_properties(flutter_stockfish_plugin PROPERTIES
 )
 
 if(MSVC)
-    add_definitions(/FI"stream_fix.h")
+    add_definitions(/FI"fixes.h")
 else()
-    add_definitions(-include stream_fix.h)
+    add_definitions(-include fixes.h)
 endif()
 
 target_compile_definitions(flutter_stockfish_plugin PUBLIC DART_SHARED_LIB)

src/Stockfish/src/misc.cpp

@@ -75,8 +75,8 @@ namespace {
 /// Version number or dev.
 constexpr string_view version = "16";
 
-/// Our fancy logging facility. The trick here is to replace cin.rdbuf() and
+/// Our fancy logging facility. The trick here is to replace fakein.rdbuf() and
-/// cout.rdbuf() with two Tie objects that tie cin and cout to a file stream. We
+/// fakeout.rdbuf() with two Tie objects that tie cin and cout to a file stream. We
 /// can toggle the logging of fakeout and std:cin at runtime whilst preserving
 /// usual I/O functionality, all without changing a single line of code!
 /// Idea from http://groups.google.com/group/comp.lang.c++/msg/1d941c0f26ea0d81
@@ -751,16 +751,12 @@ void init([[maybe_unused]] int argc, char* argv[]) {
 #ifdef _WIN32
     pathSeparator = "\\";
   #ifdef _MSC_VER
-    // Under windows argv[0] may not have the extension. Also _get_pgmptr() had
+    // Under windows argv[0] may not have the extension. Also fake_get_pgmptr() had
     // issues in some windows 10 versions, so check returned values carefully.
-    wchar_t buffer[MAX_PATH];
+    char* pgmptr = nullptr;
-    if (GetModuleFileNameW(nullptr, buffer, MAX_PATH) != 0)
+    if (!fake_get_pgmptr(&pgmptr) && pgmptr != nullptr && *pgmptr)
-    {
+        argv0 = pgmptr;
-      char narrowBuffer[MAX_PATH];
+  #endif
-      WideCharToMultiByte(CP_UTF8, 0, buffer, -1, narrowBuffer, MAX_PATH, NULL, NULL);
-      argv0 = narrowBuffer;
-    }
-#endif
 #else
     pathSeparator = "/";
 #endif

src/Stockfish/src/misc.h

@@ -70,6 +70,7 @@ std::ostream& operator<<(std::ostream&, SyncCout);
 #define sync_cout fakeout << IO_LOCK
 #define sync_endl fakeendl << IO_UNLOCK
 
+
 // align_ptr_up() : get the first aligned element of an array.
 // ptr must point to an array of size at least `sizeof(T) * N + alignment` bytes,
 // where N is the number of elements in the array.

src/create_stockfish.sh

@@ -12,6 +12,9 @@ find ./Stockfish/ -type f -exec sed -i \
     -e 's/std::cin/fakein/g' \
     -e 's/std::endl/fakeendl/g' \
     -e 's/getline(cin, cmd)/getline(fakein, cmd)/g' \
+    -e 's/cin.rdbuf/fakein.rdbuf/g' \
+    -e 's/cout.rdbuf/fakeout.rdbuf/g' \
+    -e 's/_get_pgmptr/fake_get_pgmptr/g' \
     {} +
 
 nnue_name=$(grep EvalFileDefaultName Stockfish/src/evaluate.h \

src/fixes.h

@@ -0,0 +1,2 @@
+#include "stream_fix.h"
+#include "small_fixes.h"

src/small_fixes.cpp

@@ -0,0 +1,27 @@
+#include "small_fixes.h"
+
+#include <cstring>
+#include <iostream>
+#include <string>
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#ifdef _WIN32
+#ifdef _MSC_VER
+
+
+bool fake_get_pgmptr(char** ptr) {
+    wchar_t buffer[MAX_PATH];
+    if (GetModuleFileNameW(nullptr, buffer, MAX_PATH) != 0) {
+        char* narrowBuffer = new char[MAX_PATH];
+        WideCharToMultiByte(CP_UTF8, 0, buffer, -1, narrowBuffer, MAX_PATH,
+                            NULL, NULL);
+        *ptr = narrowBuffer;
+        return false;
+    }
+    return true;
+}
+#endif
+#endif

src/small_fixes.h

@@ -0,0 +1,14 @@
+#ifndef _SMALL_FIXES_H_
+#define _SMALL_FIXES_H_
+
+#ifdef _WIN32
+#ifdef _MSC_VER
+
+// Expects a pointer to a char pointer.
+// Overwrites *ptr with a new allocated memory. 
+// Memory managment is left to the user of this function.
+bool fake_get_pgmptr(char** ptr);
+#endif
+#endif
+
+#endif

src/stockfish.cpp

@@ -3,9 +3,6 @@
 #ifdef _WIN32
 #include <fcntl.h>
 #include <io.h>
-#define STDIN_FILENO 0
-#define STDOUT_FILENO 1
-#define STDERR_FILENO 2
 #ifdef _WIN64
 #define ssize_t __int64
 #else
@@ -15,25 +12,34 @@
 #include <unistd.h>
 #endif
 
-#define BUFFER_SIZE 1024
+#include "fixes.h"
-
 #include "stockfish.h"
+#include <thread>
 
-const char *QUITOK = "quitok\n";
+const char* QUITOK = "quitok\n";
 
-int main(int, char **);
+void runMain() {}
+
+int main(int, char**);
 
 int stockfish_init() {
-    //std::cout << "Init Stockfish: Nothing todo!";
+    fakein.open();
+    fakeout.open();
     return 0;
 }
 
-int stockfish_main() {
+int _last_main_state = -2;
-    int argc = 1;
-    char *argv[] = {(char *)""};
-    int exitCode = main(argc, argv);
 
-    fakeout << exitCode << "\n";
+int stockfish_main() {
+    _last_main_state = -1;
+    int argc = 1;
+    char* empty = (char*)malloc(0);
+    *empty = 0;
+    char* argv[] = {empty};
+    int exitCode = main(argc, argv);
+    free(empty);
+
+    fakeout << QUITOK << "\n";
 
 #if _WIN32
     Sleep(100);
@@ -44,28 +50,36 @@ int stockfish_main() {
     fakeout.close();
     fakein.close();
 
+    _last_main_state = exitCode;
     return exitCode;
 }
 
-ssize_t stockfish_stdin_write(char *data) {
+void stockfish_start_main(){
+    std::thread t(stockfish_main);
+    t.detach();
+}
+
+int stockfish_last_main_state(){
+    return _last_main_state;
+}
+
+ssize_t stockfish_stdin_write(char* data) {
     std::string val(data);
-    fakeout << val << fakeendl;
     fakein << val << fakeendl;
     return val.length();
 }
 
 std::string data;
-char buffer[BUFFER_SIZE + 1];
 
-char* stockfish_stdout_read() {
+const char* stockfish_stdout_read(int trygetline) {
-    if (getline(fakeout, data)) {
+    if (trygetline) {
-        size_t len = data.length();
+        if (fakeout.try_get_line(data)) {
-        size_t i;
+            return data.c_str();
-        for (i = 0; i < len && i < BUFFER_SIZE; i++) {
+        }
-            buffer[i] = data[i];
+    } else {
+        if (getline(fakeout, data)) {
+            return data.c_str();
         }
-        buffer[i] = 0;
-        return buffer;
     }
     return nullptr;
 }

src/stockfish.h

@@ -20,29 +20,48 @@
 #ifdef _WIN32
 #define FFI_PLUGIN_EXPORT __declspec(dllexport)
 #else
-#define FFI_PLUGIN_EXPORT __attribute__((visibility("default"))) __attribute__((used))
+#define FFI_PLUGIN_EXPORT \
+    __attribute__((visibility("default"))) __attribute__((used))
 #endif
 
 // Initialisation of Stockfish.
 #ifndef _ffigen
 extern "C"
 #endif
-FFI_PLUGIN_EXPORT int stockfish_init();
+    FFI_PLUGIN_EXPORT int
+    stockfish_init();
 
 // Stockfish main loop.
 #ifndef _ffigen
 extern "C"
 #endif
-FFI_PLUGIN_EXPORT int stockfish_main();
+    FFI_PLUGIN_EXPORT int
+    stockfish_main();
+
+// Stockfish start main loop.
+#ifndef _ffigen
+extern "C"
+#endif
+    FFI_PLUGIN_EXPORT void
+    stockfish_start_main();
+
+// Stockfish last main loop state.
+#ifndef _ffigen
+extern "C"
+#endif
+    FFI_PLUGIN_EXPORT int
+    stockfish_last_main_state();
 
 // Writing to Stockfish STDIN.
 #ifndef _ffigen
 extern "C"
 #endif
-FFI_PLUGIN_EXPORT ssize_t stockfish_stdin_write(char *data);
+    FFI_PLUGIN_EXPORT ssize_t
+    stockfish_stdin_write(char* data);
 
 // Reading Stockfish STDOUT
 #ifndef _ffigen
 extern "C"
 #endif
-FFI_PLUGIN_EXPORT char * stockfish_stdout_read();
+    FFI_PLUGIN_EXPORT const char*
+    stockfish_stdout_read(int trygetline);

src/stream_fix.cpp

@@ -1,43 +1,50 @@
 #include "stream_fix.h"
 
-bool FakeStream::try_get_line(std::string &val)
+bool FakeStream::try_get_line(std::string& val) {
-{
     std::unique_lock<std::mutex> lock(mutex_guard);
-    if (string_queue.empty() || closed) return false;
+    if (string_queue.empty() || closed)
+        return false;
     val = string_queue.front();
     string_queue.pop();
     return true;
 }
 
+void FakeStream::open() {
+    std::lock_guard<std::mutex> lock(mutex_guard);
+    closed = false;
+    mutex_signal.notify_one();
+}
+
 void FakeStream::close() {
     std::lock_guard<std::mutex> lock(mutex_guard);
     closed = true;
-    mutex_signal.notify_one();
+    while (!string_queue.empty()) {
+        string_queue.pop();
+    }
+    mutex_signal.notify_all();
+}
+bool FakeStream::is_closed() {
+    return closed;
 }
-bool FakeStream::is_closed() { return closed; }
 
-std::streambuf* FakeStream::rdbuf() { return nullptr; }
+std::streambuf* FakeStream::rdbuf() {
+    return nullptr;
+}
 
-std::streambuf* FakeStream::rdbuf(std::streambuf* buf) { return nullptr; }
+std::streambuf* FakeStream::rdbuf(std::streambuf* buf) {
+    (void)buf;
+    return nullptr;
+}
 
 bool std::getline(FakeStream& is, std::string& str) {
-    if (is.is_closed()) return false;
+    if (is.is_closed())
+        return false;
     is >> str;
-    if (is.is_closed()) return false;
+    if (is.is_closed())
+        return false;
     return true;
 }
 
-/*FakeStream &operator<<(FakeStream &os, SyncFakeout sc) {
-    static std::mutex m;
-    if (sc == SyncFakeout::IO_LOCK)
-        m.lock();
-
-    if (sc == SyncFakeout::IO_UNLOCK)
-        m.unlock();
-
-    return os;
-}*/
-
 FakeStream fakeout;
 FakeStream fakein;
 std::string fakeendl("\n");

src/stream_fix.h

@@ -6,18 +6,24 @@
 #include <queue>
 #include <sstream>
 
+#ifdef __EMSCRIPTEN__
+#include <emscripten.h>
+#include <emscripten/threading.h>
+#endif
+
 template <typename T>
 inline std::string stringify(const T& input) {
-    std::ostringstream output;
+    std::ostringstream output;  // from   www  .ja va  2s  . com
     output << input;
-    return output.str();
+    return std::string(output.str());
 }
 
 class FakeStream {
    public:
     template <typename T>
     FakeStream& operator<<(const T& val) {
-        if (closed) return *this;
+        if (closed)
+            return *this;
         std::lock_guard<std::mutex> lock(mutex_guard);
         string_queue.push(stringify(val));
         mutex_signal.notify_one();
@@ -25,28 +31,46 @@ class FakeStream {
     };
     template <typename T>
     FakeStream& operator>>(T& val) {
-        if (closed) return *this;
+        if (closed)
+            return *this;
         std::unique_lock<std::mutex> lock(mutex_guard);
+#ifdef __EMSCRIPTEN__
+        if (emscripten_is_main_runtime_thread()) {
+            lock.unlock();
+            while (true) {
+                lock = std::unique_lock<std::mutex>(mutex_guard);
+                if (!string_queue.empty() || closed)
+                    break;
+                lock.unlock();
+                emscripten_sleep(10);
+            }
+        } else {
+            mutex_signal.wait(
+                lock, [this] { return !string_queue.empty() || closed; });
+        }
+#else
         mutex_signal.wait(lock,
                           [this] { return !string_queue.empty() || closed; });
-        if (closed) return *this;
+#endif
+        if (closed)
+            return *this;
         val = string_queue.front();
         string_queue.pop();
         return *this;
     };
 
-    bool try_get_line(std::string& val);
+    bool try_get_line(std::string&);
 
+    void open();
     void close();
     bool is_closed();
 
     std::streambuf* rdbuf();
-    std::streambuf* rdbuf(std::streambuf* __sb);
+    std::streambuf* rdbuf(std::streambuf*);
 
    private:
     bool closed = false;
     std::queue<std::string> string_queue;
-    //std::string line;
     std::mutex mutex_guard;
     std::condition_variable mutex_signal;
 };
@@ -55,13 +79,6 @@ namespace std {
 bool getline(FakeStream& is, std::string& str);
 }  // namespace std
 
-//enum SyncFakeout { IO_LOCK, IO_UNLOCK };
-//FakeStream &operator<<(FakeStream &os, SyncFakeout sc);
-
-// #define endl fakeendl
-// #define cout fakeout
-// #define cin fakein
-
 extern FakeStream fakeout;
 extern FakeStream fakein;
 extern std::string fakeendl;

test/stockfish_test.dart

@@ -0,0 +1,46 @@
+// Import the test package and Counter class
+import 'dart:async';
+
+import 'package:flutter_stockfish_plugin/stockfish.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+///  To run the test, you have to
+///    1. run the example (example/lib/main.dart) on desktop (linux/windows),
+///       so everything gets build
+///    2. copy flutter_stockfish_plugin.dll to root-directory
+///       (directly to flutter_stockfish_plugin) manually
+void main() {
+  test('Start Stockfish and uci init', () async {
+    final fish1 = Stockfish();
+
+    List<String> received = [];
+    Completer readyCompleter = Completer();
+    Completer uciOkCompleter = Completer();
+
+    fish1.stdout.listen((event) {
+      print(event);
+      received.add(event);
+      if (event == "uciok") {
+        uciOkCompleter.complete();
+      }
+    });
+    fish1.state.addListener(() {
+      if (fish1.state.value.name == "ready") {
+        readyCompleter.complete();
+      } else if (fish1.state.value.name == "error") {
+        readyCompleter.completeError("ERROR: CANNOT INIT STOCKFISH");
+      }
+    });
+
+    // wait for stockfish startup
+    await readyCompleter.future;
+
+    // then init uci
+    fish1.stdin = "uci";
+
+    // then wait for uciok
+    await uciOkCompleter.future;
+
+    expect(received.last, "uciok");
+  });
+}

web/CMakeLists.txt

@@ -0,0 +1,52 @@
+# The Flutter tooling requires that developers have CMake 3.18 or later
+# installed. You should not increase this version, as doing so will cause
+# the plugin to fail to compile for some customers of the plugin.
+cmake_minimum_required(VERSION 3.18)
+
+project(flutter_stockfish_plugin)
+file(GLOB_RECURSE cppPaths "../src/Stockfish/src/*.cpp")
+set(CMAKE_CXX_STANDARD 17)
+
+set(NNUE_NAME nn-5af11540bbfe.nnue)
+
+add_definitions(-DNNUE_EMBEDDING_OFF) # embeding nnue network is currently not supported.
+
+set(EMSCRIPTEN_PATH "$ENV{EMSDK}/upstream/emscripten" CACHE STRING "Path to Emscripten")
+set(CMAKE_TOOLCHAIN_FILE "${EMSCRIPTEN_PATH}/cmake/Modules/Platform/Emscripten.cmake" CACHE STRING "Emscripten toolchain file")
+set(CMAKE_CXX_COMPILER "${EMSCRIPTEN_PATH}/em++")
+
+set(COMMON_FLAGS "-Wall -Wcast-qual -Wno-main -fno-exceptions -std=c++17 -pedantic -Wextra -Wshadow -Wmissing-declarations -flto") 
+set(SIMD_FLAGS "${CMAKE_CXX_FLAGS} -msimd128 -mavx -msse -DUSE_SSE2 -msse2 -msse3 -DUSE_SSSE3 -mssse3 -DUSE_SSE41 -msse4.1 -DUSE_SSE42 -msse4.2")
+
+set(EM_FLAGS "${EM_FLAGS} -s WASM=1 -sASYNCIFY")
+set(EM_FLAGS "${EM_FLAGS} -s EXPORTED_RUNTIME_METHODS=ccall,cwrap")
+set(EM_FLAGS "${EM_FLAGS} -s TOTAL_STACK=8MB -s INITIAL_MEMORY=512MB -s ALLOW_MEMORY_GROWTH")
+set(EM_FLAGS "${EM_FLAGS} -s PTHREAD_POOL_SIZE=32")
+
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${COMMON_FLAGS} ${SIMD_FLAGS} -O3 -DNDEBUG -s USE_PTHREADS=1 -Dmain=runMain")
+
+
+add_executable(${PROJECT_NAME} 
+  "../src/stockfish.cpp"
+  "../src/stream_fix.cpp"
+  "../src/small_fixes.cpp"
+  ${cppPaths}
+)
+
+set_target_properties(${PROJECT_NAME} PROPERTIES LINK_FLAGS "${EM_FLAGS}")
+
+set_target_properties(${PROJECT_NAME} PROPERTIES OUTPUT_NAME "${PROJECT_NAME}.js")
+
+add_definitions(-include ../src/fixes.h)
+
+target_include_directories(${PROJECT_NAME} 
+  PUBLIC
+  "./"
+)
+
+
+file(DOWNLOAD https://tests.stockfishchess.org/api/nn/${NNUE_NAME} ${CMAKE_BINARY_DIR}/stockfish_data.bin)
+
+
+

web/js_bindings.js

@@ -0,0 +1,94 @@
+const nnue_name = "nn-5af11540bbfe.nnue";
+const path = "stockfish/";
+
+let s_read, s_write, s_main, s_init, s_state;
+
+let ready = false;
+let ready_cb = null;
+
+Module.onRuntimeInitialized = async function () {
+    let data = await fetch(path + "stockfish_data.bin");
+    let b = new Uint8Array(await data.arrayBuffer());
+    FS.createDataFile("/", nnue_name, b, true, false, true);
+    s_read = Module.cwrap("stockfish_stdout_read", "char*", ["bool"], { async: false });
+    s_write = Module.cwrap("stockfish_stdin_write", "ssize_t", ["char*"], { async: false });
+    s_main = Module.cwrap("stockfish_start_main", "void", [], { async: false });
+    s_init = Module.cwrap("stockfish_init", "int", [], { async: false });
+    s_state = Module.cwrap("stockfish_last_main_state", "int", [], { async: false });
+    ready = true;
+    if (ready_cb) ready_cb();
+
+}
+
+function wait_ready(res) {
+    if (ready) return void res();
+    ready_cb = res;
+}
+
+let _listener_id = -1;
+let _listener_line_cb = (_) => { };
+let _listener_state_cb = (_) => { };
+let _last_state = -2;
+function _stockfish_listener() {
+    let state = s_state();
+    if (state >= 0 && _last_state != state) {
+        _listener_state_cb(state);
+    }
+    _last_state = state;
+    let out = readline();
+    while (out.length != 0) {
+        _listener_line_cb(out);
+        out = readline();
+    }
+    _listener_id = setTimeout(_stockfish_listener, 10);
+}
+
+function start_listening(line_cb = (_) => { }, state_cb = (_) => { }) {
+    requestAnimationFrame(_stockfish_listener);
+    _listener_line_cb = line_cb;
+    _listener_state_cb = state_cb;
+    s_init();
+    s_main();
+}
+
+function stop_listening() {
+    if (_listener_id != -1) clearTimeout(_listener_id);
+    _listener_id = -1;
+}
+
+function _read() {
+    let ptr = s_read(true);
+    if (ptr == 0) {
+        return -1;
+    }
+    return UTF8ToString(ptr);
+}
+var read_buffer = "";
+function readline() {
+    if (!read_buffer.includes("\n"))
+        while (true) {
+            let next = _read();
+            if (next === -1) break;
+            read_buffer += next;
+            if (next.includes("\n")) break;
+        }
+
+    let index = read_buffer.indexOf("\n");
+    let out = "";
+    if (index == -1) {
+        out = read_buffer;
+        read_buffer = "";
+    } else {
+        out = read_buffer.substring(0, index);
+        read_buffer = read_buffer.substring(index + 1);
+    }
+    return out;
+}
+
+function write(string) {
+    let buffer = _malloc(string.length + 1);
+    stringToUTF8(string, buffer, string.length + 1);
+    let out = s_write(buffer);
+    _free(buffer);
+    return out;
+}