Adds a minimal na-winit-glutin example

This example shows how to draw a triangle with GL[ES via the Glutin crate (the app works on desktop and Android) and on Android it demonstrates how to re-create the applications surface state when it is paused and resumed. The Renderer code and some utilities are from the upstream Glutin example.
2026-07-09 16:27:28 +00:00 · 2022-10-20 20:52:14 +01:00
parent e8ae198653
commit bd8cc86ec7
39 changed files with 2705 additions and 1 deletions
@@ -14,5 +14,6 @@ exclude = [
    "examples/na-winit-wgpu",
    "examples/na-subclass-jni",
    "examples/na-openxr-info",
-    "examples/na-openxr-wgpu"
+    "examples/na-openxr-wgpu",
+    "examples/na-winit-glutin"
 ]
@@ -0,0 +1,21 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties
+*.so
+
+
+# Added by cargo
+
+/target
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="11" />
+  </component>
+</project>
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="testRunner" value="GRADLE" />
+        <option name="distributionType" value="DEFAULT_WRAPPED" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+            <option value="$PROJECT_DIR$/app" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DesignSurface">
+    <option name="filePathToZoomLevelMap">
+      <map>
+        <entry key="..\:/Users/Robert/src/agdk-rust/examples/agdk-winit-wgpu/app/src/main/res/layout/activity_main.xml" value="0.5546875" />
+      </map>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="Android Studio default JDK" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+</project>
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/../.." vcs="Git" />
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
@@ -0,0 +1,70 @@
+[package]
+name = "na-winit-glutin"
+version = "0.1.0"
+edition = "2021"
+
+
+[features]
+default = ["egl", "glx", "x11", "wayland", "wgl"]
+
+desktop = []
+
+egl = ["glutin/egl"]
+glx = ["glutin/glx", "glutin/x11", "winit/x11", "x11"]
+wgl = ["glutin/wgl"]
+x11 = ["glutin/x11", "winit/x11"]
+wayland = ["glutin/wayland", "winit/wayland", "winit/wayland-dlopen", "winit/wayland-csd-adwaita-notitle"]
+
+
+[dependencies]
+log = "0.4"
+winit = { version = "0.27", features = ["android-native-activity"] }
+glutin = { git = "https://github.com/rust-windowing/glutin" }
+raw-window-handle = "0.5.0"
+
+[target.'cfg(not(target_os = "android"))'.dependencies]
+env_logger = "0.9"
+
+[target.'cfg(target_os = "android")'.dependencies]
+android_logger = "0.11.0"
+
+[build-dependencies]
+gl_generator = "0.14"
+cfg_aliases = "0.1.1"
+
+[patch.crates-io]
+
+# This branch of Winit has an updated Android backend based on android-activity
+# Note: The winit branches are current misnamed:
+# - "android-activity" is based on Winit 0.27 (required for Egui compatibility)
+# - "android-activity-0.27" is based on Winit master
+# The -0.27 branch is currently associated with a pull request so we'll just
+# stick with these names for now
+winit = { git = "https://github.com/rib/winit", branch = "android-activity" }
+#winit = { path = "../../../winit" }
+
+# Note:
+# Since android-activity is responsible for invoking the `android_main`
+# entrypoint for a native Rust application there can only be a single
+# implementation of the crate linked with the application.
+#
+# By default the Winit-based examples use released versions of android-activity
+# to help keep the version in sync with the Winit backend.
+#
+# If you'd like to build this example against the local checkout of
+# android-activity you should specify a patch here to make sure you also affect
+# the version that Winit uses.
+#
+# Note: also check that the local android-activity/Cargo.toml version matches
+# the android-activity version that Winit depends on (in case you need to check
+# out a release branch locally to be compatible)
+#android-activity = { path = "../../android-activity" }
+
+[lib]
+#name="main"
+crate_type=["cdylib"]
+
+[[bin]]
+path="src/lib.rs"
+name="test-winit-glutin"
+required-features = [ "desktop" ]
@@ -0,0 +1,29 @@
+This is a minimal example that shows how to draw a triangle using GL[ES] via the
+Glutin crate.
+
+This example demonstrates how to re-create the application's surface state as
+necessary when the application is paused and resumed on Android.
+
+# Gradle Build
+```
+export ANDROID_NDK_HOME="path/to/ndk"
+export ANDROID_HOME="path/to/sdk"
+
+rustup target add aarch64-linux-android
+cargo install cargo-ndk
+
+cargo ndk -t arm64-v8a -o app/src/main/jniLibs/  build
+./gradlew build
+./gradlew installDebug
+```
+
+# Cargo APK Build
+```
+export ANDROID_NDK_HOME="path/to/ndk"
+export ANDROID_SDK_HOME="path/to/sdk"
+
+rustup target add aarch64-linux-android
+cargo install cargo-apk
+
+cargo apk run
+```
@@ -0,0 +1 @@
+/build
@@ -0,0 +1,40 @@
+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdk 31
+
+    defaultConfig {
+        applicationId "co.realfit.nawinitglutin"
+        minSdk 28
+        targetSdk 31
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+        debug {
+            minifyEnabled false
+            //packagingOptions {
+            //    doNotStrip '**/*.so'
+            //}
+            //debuggable true
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+
+}
+
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="co.realfit.agdkwinitglutin">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="AGDK Winit Glutin"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
+        <activity
+            android:name="android.app.NativeActivity"
+            android:configChanges="orientation|screenSize|screenLayout|keyboardHidden"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+
+            <meta-data android:name="android.app.lib_name" android:value="na_winit_glutin" />
+        </activity>
+    </application>
+
+</manifest>
@@ -0,0 +1,30 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>
@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
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+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
@@ -0,0 +1,10 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+plugins {
+    id 'com.android.application' version '7.1.2' apply false
+    id 'com.android.library' version '7.1.2' apply false
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}
+
@@ -0,0 +1,37 @@
+use std::env;
+use std::fs::File;
+use std::path::PathBuf;
+
+use cfg_aliases::cfg_aliases;
+use gl_generator::{Api, Fallbacks, Profile, Registry, StructGenerator};
+
+fn main() {
+    // XXX this is taken from glutin/build.rs.
+
+    // Setup alias to reduce `cfg` boilerplate.
+    cfg_aliases! {
+        // Systems.
+        android: { target_os = "android" },
+        wasm: { target_arch = "wasm32" },
+        macos: { target_os = "macos" },
+        ios: { target_os = "ios" },
+        apple: { any(target_os = "ios", target_os = "macos") },
+        free_unix: { all(unix, not(apple), not(android)) },
+
+        // Native displays.
+        x11_platform: { all(feature = "x11", free_unix, not(wasm)) },
+        wayland_platform: { all(feature = "wayland", free_unix, not(wasm)) },
+
+        // Backends.
+        egl_backend: { all(feature = "egl", any(windows, unix), not(apple), not(wasm)) },
+        glx_backend: { all(feature = "glx", x11_platform, not(wasm)) },
+        wgl_backend: { all(feature = "wgl", windows, not(wasm)) },
+        cgl_backend: { all(macos, not(wasm)) },
+    }
+
+    let dest = PathBuf::from(&env::var("OUT_DIR").unwrap());
+    let mut file = File::create(&dest.join("gl_bindings.rs")).unwrap();
+    Registry::new(Api::Gles2, (3, 0), Profile::Core, Fallbacks::All, [])
+        .write_bindings(StructGenerator, &mut file)
+        .unwrap();
+}
@@ -0,0 +1,21 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app"s APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Enables namespacing of each library's R class so that its R class includes only the
+# resources declared in the library itself and none from the library's dependencies,
+# thereby reducing the size of the R class for that library
+android.nonTransitiveRClass=true
@@ -0,0 +1,6 @@
+#Mon May 02 15:39:12 BST 2022
+distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-bin.zip
+distributionPath=wrapper/dists
+zipStorePath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
@@ -0,0 +1,16 @@
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        google()
+        mavenCentral()
+    }
+}
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+include ':app'
@@ -0,0 +1,444 @@
+use std::ffi::{CStr, CString};
+use std::num::NonZeroU32;
+
+use raw_window_handle::{
+    HasRawDisplayHandle, HasRawWindowHandle, RawDisplayHandle, RawWindowHandle,
+};
+
+use winit::event::{Event, WindowEvent};
+use winit::event_loop::{ControlFlow, EventLoop, EventLoopBuilder, EventLoopWindowTarget};
+#[cfg(target_os = "android")]
+use winit::platform::android::activity::AndroidApp;
+#[cfg(glx_backend)]
+use winit::platform::unix;
+
+use glutin::config::{Config, ConfigSurfaceTypes, ConfigTemplate, ConfigTemplateBuilder};
+use glutin::context::{ContextApi, ContextAttributesBuilder, NotCurrentContext};
+use glutin::display::{Display, DisplayApiPreference};
+use glutin::prelude::*;
+use glutin::surface::{SurfaceAttributesBuilder, WindowSurface};
+
+#[rustfmt::skip]
+static VERTEX_DATA: [f32; 15] = [
+    -0.5, -0.5,  1.0,  0.0,  0.0,
+     0.0,  0.5,  0.0,  1.0,  0.0,
+     0.5, -0.5,  0.0,  0.0,  1.0,
+];
+
+const VERTEX_SHADER_SOURCE: &[u8] = include_bytes!("shader-vert.glsl");
+const FRAGMENT_SHADER_SOURCE: &[u8] = include_bytes!("shader-frag.glsl");
+
+pub mod gl {
+    #![allow(clippy::all)]
+    include!(concat!(env!("OUT_DIR"), "/gl_bindings.rs"));
+
+    pub use Gles2 as Gl;
+}
+
+unsafe fn create_shader(
+    gl: &gl::Gl,
+    shader: gl::types::GLenum,
+    source: &[u8],
+) -> gl::types::GLuint {
+    let shader = gl.CreateShader(shader);
+    let len = source.len() as gl::types::GLint;
+    gl.ShaderSource(shader, 1, [source.as_ptr().cast()].as_ptr(), &len);
+    gl.CompileShader(shader);
+    shader
+}
+
+fn get_gl_string(gl: &gl::Gl, variant: gl::types::GLenum) -> Option<&'static CStr> {
+    unsafe {
+        let s = gl.GetString(variant);
+        (!s.is_null()).then(|| CStr::from_ptr(s.cast()))
+    }
+}
+
+pub struct Renderer {
+    program: gl::types::GLuint,
+    vao: gl::types::GLuint,
+    vbo: gl::types::GLuint,
+    gl: gl::Gl,
+}
+
+impl Renderer {
+    pub fn new(gl_display: &Display) -> Self {
+        unsafe {
+            let gl = gl::Gl::load_with(|symbol| {
+                let symbol = CString::new(symbol).unwrap();
+                gl_display.get_proc_address(symbol.as_c_str()).cast()
+            });
+
+            if let Some(renderer) = get_gl_string(&gl, gl::RENDERER) {
+                println!("Running on {}", renderer.to_string_lossy());
+            }
+            if let Some(version) = get_gl_string(&gl, gl::VERSION) {
+                println!("OpenGL Version {}", version.to_string_lossy());
+            }
+
+            if let Some(shaders_version) = get_gl_string(&gl, gl::SHADING_LANGUAGE_VERSION) {
+                println!("Shaders version on {}", shaders_version.to_string_lossy());
+            }
+
+            let vertex_shader = create_shader(&gl, gl::VERTEX_SHADER, VERTEX_SHADER_SOURCE);
+            let fragment_shader = create_shader(&gl, gl::FRAGMENT_SHADER, FRAGMENT_SHADER_SOURCE);
+
+            let program = gl.CreateProgram();
+
+            gl.AttachShader(program, vertex_shader);
+            gl.AttachShader(program, fragment_shader);
+
+            gl.LinkProgram(program);
+
+            gl.UseProgram(program);
+
+            gl.DeleteShader(vertex_shader);
+            gl.DeleteShader(fragment_shader);
+
+            let mut vao = std::mem::zeroed();
+            gl.GenVertexArrays(1, &mut vao);
+            gl.BindVertexArray(vao);
+
+            let mut vbo = std::mem::zeroed();
+            gl.GenBuffers(1, &mut vbo);
+            gl.BindBuffer(gl::ARRAY_BUFFER, vbo);
+            gl.BufferData(
+                gl::ARRAY_BUFFER,
+                (VERTEX_DATA.len() * std::mem::size_of::<f32>()) as gl::types::GLsizeiptr,
+                VERTEX_DATA.as_ptr() as *const _,
+                gl::STATIC_DRAW,
+            );
+
+            let pos_attrib = gl.GetAttribLocation(program, b"position\0".as_ptr() as *const _);
+            let color_attrib = gl.GetAttribLocation(program, b"color\0".as_ptr() as *const _);
+            gl.VertexAttribPointer(
+                pos_attrib as gl::types::GLuint,
+                2,
+                gl::FLOAT,
+                0,
+                5 * std::mem::size_of::<f32>() as gl::types::GLsizei,
+                std::ptr::null(),
+            );
+            gl.VertexAttribPointer(
+                color_attrib as gl::types::GLuint,
+                3,
+                gl::FLOAT,
+                0,
+                5 * std::mem::size_of::<f32>() as gl::types::GLsizei,
+                (2 * std::mem::size_of::<f32>()) as *const () as *const _,
+            );
+            gl.EnableVertexAttribArray(pos_attrib as gl::types::GLuint);
+            gl.EnableVertexAttribArray(color_attrib as gl::types::GLuint);
+
+            Self {
+                program,
+                vao,
+                vbo,
+                gl,
+            }
+        }
+    }
+
+    pub fn draw(&self) {
+        unsafe {
+            self.gl.UseProgram(self.program);
+
+            self.gl.BindVertexArray(self.vao);
+            self.gl.BindBuffer(gl::ARRAY_BUFFER, self.vbo);
+
+            self.gl.ClearColor(0.1, 0.1, 0.1, 0.9);
+            self.gl.Clear(gl::COLOR_BUFFER_BIT);
+            self.gl.DrawArrays(gl::TRIANGLES, 0, 3);
+        }
+    }
+
+    pub fn resize(&self, width: i32, height: i32) {
+        unsafe {
+            self.gl.Viewport(0, 0, width, height);
+        }
+    }
+}
+
+impl Drop for Renderer {
+    fn drop(&mut self) {
+        unsafe {
+            self.gl.DeleteProgram(self.program);
+            self.gl.DeleteBuffers(1, &self.vbo);
+            self.gl.DeleteVertexArrays(1, &self.vao);
+        }
+    }
+}
+
+struct SurfaceState {
+    window: winit::window::Window,
+    surface: glutin::surface::Surface<glutin::surface::WindowSurface>,
+}
+
+struct App {
+    winsys_display: RawDisplayHandle,
+    glutin_display: Option<Display>,
+    surface_state: Option<SurfaceState>,
+    context: Option<glutin::context::PossiblyCurrentContext>,
+    render_state: Option<Renderer>,
+}
+
+impl App {
+    fn new(winsys_display: RawDisplayHandle) -> Self {
+        Self {
+            winsys_display,
+            glutin_display: None,
+            surface_state: None,
+            context: None,
+            render_state: None,
+        }
+    }
+}
+
+impl App {
+    #[allow(unused_variables)]
+    fn create_display(
+        raw_display: RawDisplayHandle,
+        raw_window_handle: RawWindowHandle,
+    ) -> Display {
+        #[cfg(egl_backend)]
+        let preference = DisplayApiPreference::Egl;
+
+        #[cfg(glx_backend)]
+        let preference = DisplayApiPreference::Glx(Box::new(unix::register_xlib_error_hook));
+
+        #[cfg(cgl_backend)]
+        let preference = DisplayApiPreference::Cgl;
+
+        #[cfg(wgl_backend)]
+        let preference = DisplayApiPreference::Wgl(Some(raw_window_handle));
+
+        #[cfg(all(egl_backend, wgl_backend))]
+        let preference = DisplayApiPreference::WglThenEgl(Some(raw_window_handle));
+
+        #[cfg(all(egl_backend, glx_backend))]
+        let preference = DisplayApiPreference::GlxThenEgl(Box::new(unix::register_xlib_error_hook));
+
+        // Create connection to underlying OpenGL client Api.
+        unsafe { Display::new(raw_display, preference).unwrap() }
+    }
+
+    fn ensure_glutin_display(&mut self, window: &winit::window::Window) {
+        if self.glutin_display.is_none() {
+            let raw_window_handle = window.raw_window_handle();
+            self.glutin_display =
+                Some(Self::create_display(self.winsys_display, raw_window_handle));
+        }
+    }
+
+    fn create_compatible_gl_context(
+        glutin_display: &Display,
+        raw_window_handle: RawWindowHandle,
+        config: &Config,
+    ) -> NotCurrentContext {
+        let context_attributes = ContextAttributesBuilder::new().build(Some(raw_window_handle));
+
+        // Since glutin by default tries to create OpenGL core context, which may not be
+        // present we should try gles.
+        let fallback_context_attributes = ContextAttributesBuilder::new()
+            .with_context_api(ContextApi::Gles(None))
+            .build(Some(raw_window_handle));
+        unsafe {
+            glutin_display
+                .create_context(&config, &context_attributes)
+                .unwrap_or_else(|_| {
+                    glutin_display
+                        .create_context(config, &fallback_context_attributes)
+                        .expect("failed to create context")
+                })
+        }
+    }
+
+    /// Create template to find OpenGL config.
+    pub fn config_template(raw_window_handle: RawWindowHandle) -> ConfigTemplate {
+        let builder = ConfigTemplateBuilder::new()
+            .with_alpha_size(8)
+            .compatible_with_native_window(raw_window_handle)
+            .with_surface_type(ConfigSurfaceTypes::WINDOW);
+
+        #[cfg(cgl_backend)]
+        let builder = builder.with_transparency(true).with_multisampling(8);
+
+        builder.build()
+    }
+
+    fn ensure_surface_and_context<T>(&mut self, event_loop: &EventLoopWindowTarget<T>) {
+        let window = winit::window::Window::new(&event_loop).unwrap();
+        let raw_window_handle = window.raw_window_handle();
+
+        // Lazily initialize, egl, wgl, glx etc
+        self.ensure_glutin_display(&window);
+        let glutin_display = self
+            .glutin_display
+            .as_ref()
+            .expect("Can't ensure surface + context without a Glutin Display connection");
+
+        let template = Self::config_template(raw_window_handle);
+        let config = unsafe {
+            glutin_display
+                .find_configs(template)
+                .unwrap()
+                .reduce(|accum, config| {
+                    // Find the config with the maximum number of samples.
+                    //
+                    // In general if you're not sure what you want in template you can request or
+                    // don't want to require multisampling for example, you can search for a
+                    // specific option you want afterwards.
+                    //
+                    // XXX however on macOS you can request only one config, so you should do
+                    // a search with the help of `find_configs` and adjusting your template.
+                    if config.num_samples() > accum.num_samples() {
+                        config
+                    } else {
+                        accum
+                    }
+                })
+                .unwrap()
+        };
+        println!("Picked a config with {} samples", config.num_samples());
+
+        // XXX: Winit is missing a window.surface_size() API and the inner_size may be the wrong
+        // size to use on some platforms!
+        let (width, height): (u32, u32) = window.inner_size().into();
+        let raw_window_handle = window.raw_window_handle();
+        let attrs = SurfaceAttributesBuilder::<WindowSurface>::new().build(
+            raw_window_handle,
+            NonZeroU32::new(width).unwrap(),
+            NonZeroU32::new(height).unwrap(),
+        );
+        let surface = unsafe {
+            glutin_display
+                .create_window_surface(&config, &attrs)
+                .unwrap()
+        };
+        let surface_state = SurfaceState { window, surface };
+
+        let prev_ctx = self.context.take();
+        match prev_ctx {
+            Some(ctx) => {
+                let not_current_context = ctx
+                    .make_not_current()
+                    .expect("Failed to make GL context not current");
+                self.context = Some(
+                    not_current_context
+                        .make_current(&surface_state.surface)
+                        .expect("Failed to make GL context current"),
+                );
+            }
+            None => {
+                let not_current_context = Self::create_compatible_gl_context(
+                    glutin_display,
+                    raw_window_handle,
+                    &config,
+                );
+                self.context = Some(
+                    not_current_context
+                        .make_current(&surface_state.surface)
+                        .expect("Failed to make GL context current"),
+                );
+            }
+        }
+
+        self.surface_state = Some(surface_state);
+    }
+
+    fn ensure_renderer(&mut self) {
+        let glutin_display = self
+            .glutin_display
+            .as_ref()
+            .expect("Can't ensure renderer without a Glutin Display connection");
+        self.render_state
+            .get_or_insert_with(|| Renderer::new(glutin_display));
+    }
+
+    fn queue_redraw(&self) {
+        if let Some(surface_state) = &self.surface_state {
+            log::trace!("Making Redraw Request");
+            surface_state.window.request_redraw();
+        }
+    }
+
+    fn resume<T>(&mut self, event_loop: &EventLoopWindowTarget<T>) {
+        log::trace!("Resumed, creating render state...");
+        self.ensure_surface_and_context(event_loop);
+        self.ensure_renderer();
+        self.queue_redraw();
+    }
+}
+
+fn run(event_loop: EventLoop<()>) {
+    log::trace!("Running mainloop...");
+
+    let raw_display = event_loop.raw_display_handle();
+    let mut app = App::new(raw_display);
+
+    event_loop.run(move |event, event_loop, control_flow| {
+        log::trace!("Received Winit event: {event:?}");
+
+        *control_flow = ControlFlow::Wait;
+        match event {
+            Event::Resumed => {
+                app.resume(event_loop);
+            }
+            Event::Suspended => {
+                log::trace!("Suspended, dropping surface state...");
+                app.surface_state = None;
+            }
+            Event::WindowEvent {
+                event: WindowEvent::Resized(_size),
+                ..
+            } => {
+                // Winit: doesn't currently implicitly request a redraw
+                // for a resize which may be required on some platforms...
+                app.queue_redraw();
+            }
+            Event::RedrawRequested(_) => {
+                log::trace!("Handling Redraw Request");
+
+                if let Some(ref surface_state) = app.surface_state {
+                    if let Some(ctx) = &app.context {
+                        if let Some(ref renderer) = app.render_state {
+                            renderer.draw();
+                            if let Err(err) = surface_state.surface.swap_buffers(ctx) {
+                                log::error!("Failed to swap buffers after render: {}", err);
+                            }
+                        }
+                        app.queue_redraw();
+                    }
+                }
+            }
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                ..
+            } => *control_flow = ControlFlow::Exit,
+            _ => {}
+        }
+    });
+}
+
+#[cfg(target_os = "android")]
+#[no_mangle]
+fn android_main(app: AndroidApp) {
+    use winit::platform::android::EventLoopBuilderExtAndroid;
+
+    android_logger::init_once(android_logger::Config::default().with_min_level(log::Level::Trace));
+
+    let event_loop = EventLoopBuilder::new().with_android_app(app).build();
+    run(event_loop);
+}
+
+// declared as pub to avoid dead_code warnings from cdylib target build
+#[cfg(not(target_os = "android"))]
+pub fn main() {
+    env_logger::builder()
+        .filter_level(log::LevelFilter::Trace) // Default Log Level
+        .parse_default_env()
+        .init();
+
+    let event_loop = EventLoopBuilder::new().build();
+    run(event_loop);
+}
@@ -0,0 +1,8 @@
+#version 100
+precision mediump float;
+
+varying vec3 v_color;
+
+void main() {
+    gl_FragColor = vec4(v_color, 1.0);
+}
@@ -0,0 +1,12 @@
+#version 100
+precision mediump float;
+
+attribute vec2 position;
+attribute vec3 color;
+
+varying vec3 v_color;
+
+void main() {
+    gl_Position = vec4(position, 0.0, 1.0);
+    v_color = color;
+}