add Android support to build.dart

dart_filament/hook/build.dart

@@ -1,9 +1,4 @@
-// Copyright (c) 2023, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
 import 'dart:io';
-
 import 'package:logging/logging.dart';
 import 'package:native_assets_cli/native_assets_cli.dart';
 import 'package:native_toolchain_c/native_toolchain_c.dart';
@@ -12,7 +7,33 @@ void main(List<String> args) async {
   await build(args, (config, output) async {
     var platform = config.targetOS.toString().toLowerCase();
 
-    var libDir = "${config.packageRoot.toFilePath()}/native/lib/$platform/${config.dryRun ? "debug" : config.buildMode == BuildMode.debug ? "debug" : "release"}";
+    var libDir = "${config.packageRoot.toFilePath()}/native/lib/$platform/";
+
+    if (platform == "macos") {
+      libDir +=
+          "${config.dryRun ? "debug" : config.buildMode == BuildMode.debug ? "debug" : "release"}";
+    } else if (platform == "android") {
+      // we don't recommend using Filament debug builds on Android, since there
+      // are known driver issues, e.g.:
+      // https://github.com/google/filament/issues/7162
+      // (these aren't present in Filament release builds).
+      // However, if for some reason you need to debug a Filament-specific issue,
+      // you can build your own debug libraries, copy to the native/lib/android/debug folder, then change the following to "debug".
+      libDir += "release";
+    }
+
+    if (platform == "android" || platform == "windows") {
+      if (!config.dryRun) {
+        final archExtension = switch (config.targetArchitecture) {
+          Architecture.arm => "armeabi-v7a",
+          Architecture.arm64 => "arm64-v8a",
+          Architecture.x64 => "x86_64",
+          Architecture.ia32 => "x86",
+          _ => throw FormatException('Invalid')
+        };
+        libDir += "/$archExtension";
+      }
+    }
 
     final packageName = config.packageName;
 
@@ -26,40 +47,7 @@ void main(List<String> args) async {
       "${config.packageRoot.toFilePath()}/native/include/material/image.c",
     ]);
 
-    var frameworks = [];
+    final libs = [
-
-    if (platform == "ios") {
-      frameworks.addAll([
-        'Foundation',
-        'CoreGraphics',
-        'QuartzCore',
-        'GLKit',
-        "Metal",
-        'CoreVideo',
-        'OpenGLES'
-      ]);
-    } else if (platform == "macos") {
-      frameworks.addAll([
-        'Foundation',
-        'CoreVideo',
-        'Cocoa',
-        "Metal",
-      ]);
-    }
-
-    frameworks = frameworks.expand((f) => ["-framework", f]).toList();
-
-    final cbuilder = CBuilder.library(
-      name: packageName,
-      language: Language.cpp,
-      assetName: 'dart_filament.dart',
-      sources: sources,
-      includes: ['native/include', 'native/include/filament'],
-      flags: [
-        if (platform == "macos") '-mmacosx-version-min=13.0',
-        if (platform == "ios") '-mios-version-min=13.0',
-        ...frameworks,
-        '-std=c++17',
       "-lfilament",
       "-lbackend",
       "-lfilameshio",
@@ -86,20 +74,51 @@ void main(List<String> args) async {
       "-luberarchive",
       "-lzstd",
       "-lstdc++",
-        if (platform == "macos") "-lbluegl",
+      "-lbasis_transcoder"
-        if (platform == "macos") "-lbluevk",
+    ];
-        "-lbasis_transcoder",
+
+    var frameworks = [];
+
+    if (platform == "ios") {
+      frameworks.addAll([
+        'Foundation',
+        'CoreGraphics',
+        'QuartzCore',
+        'GLKit',
+        "Metal",
+        'CoreVideo',
+        'OpenGLES'
+      ]);
+    } else if (platform == "macos") {
+      frameworks.addAll([
+        'Foundation',
+        'CoreVideo',
+        'Cocoa',
+        "Metal",
+      ]);
+      libs.addAll(["-lbluegl", "-lbluevk"]);
+    } else if (platform == "android") {
+      libs.addAll(["-lGLESv3", "-lEGL", "-lbluevk", "-ldl", "-landroid"]);
+    }
+
+    frameworks = frameworks.expand((f) => ["-framework", f]).toList();
+
+    final cbuilder = CBuilder.library(
+      name: packageName,
+      language: Language.cpp,
+      assetName: 'dart_filament.dart',
+      sources: sources,
+      includes: ['native/include', 'native/include/filament'],
+      flags: [
+        '-std=c++17',
+        if (platform == "macos") '-mmacosx-version-min=13.0',
+        if (platform == "ios") '-mios-version-min=13.0',
+        ...frameworks,
+        ...libs,
         "-L$libDir",
-        "-force_load",
-        "$libDir/libbackend.a",
-        "-force_load",
-        "$libDir/libktxreader.a",
-        "-force_load",
-        "$libDir/libvkshaders.a",
       ],
       dartBuildFiles: ['hook/build.dart'],
     );
-
     await cbuilder.run(
       buildConfig: config,
       buildOutput: output,
@@ -107,5 +126,24 @@ void main(List<String> args) async {
         ..level = Level.ALL
         ..onRecord.listen((record) => print(record.message)),
     );
+    if (!config.dryRun) {
+      final archExtension = switch (config.targetArchitecture) {
+        Architecture.arm => "arm-linux-androideabi",
+        Architecture.arm64 => "aarch64-linux-android",
+        Architecture.x64 => "x86_64-linux-android",
+        Architecture.ia32 => "i686-linux-android",
+        _ => throw FormatException('Invalid')
+      };
+      var ndkRoot = File(config.cCompiler.compiler!.path).parent.parent.path;
+      var stlPath =
+          File("$ndkRoot/sysroot/usr/lib/${archExtension}/libc++_shared.so");
+      output.addAsset(NativeCodeAsset(
+          package: "dart_filament",
+          name: "libc++_shared.so",
+          linkMode: DynamicLoadingBundled(),
+          os: config.targetOS,
+          file: stlPath.uri,
+          architecture: config.targetArchitecture));
+    }
   });
 }