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';
@@ -11,8 +6,34 @@ import 'package:native_toolchain_c/native_toolchain_c.dart';
 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;
 
@@ -26,6 +47,36 @@ void main(List<String> args) async {
       "${config.packageRoot.toFilePath()}/native/include/material/image.c",
     ]);
 
+    final libs = [
+      "-lfilament",
+      "-lbackend",
+      "-lfilameshio",
+      "-lviewer",
+      "-lfilamat",
+      "-lgeometry",
+      "-lutils",
+      "-lfilabridge",
+      "-lgltfio_core",
+      "-lfilament-iblprefilter",
+      "-limage",
+      "-limageio",
+      "-ltinyexr",
+      "-lgltfio_core",
+      "-lfilaflat",
+      "-ldracodec",
+      "-libl",
+      "-lktxreader",
+      "-lpng",
+      "-lz",
+      "-lstb",
+      "-luberzlib",
+      "-lsmol-v",
+      "-luberarchive",
+      "-lzstd",
+      "-lstdc++",
+      "-lbasis_transcoder"
+    ];
+
     var frameworks = [];
 
     if (platform == "ios") {
@@ -45,6 +96,9 @@ void main(List<String> args) async {
         'Cocoa',
         "Metal",
       ]);
+      libs.addAll(["-lbluegl", "-lbluevk"]);
+    } else if (platform == "android") {
+      libs.addAll(["-lGLESv3", "-lEGL", "-lbluevk", "-ldl", "-landroid"]);
     }
 
     frameworks = frameworks.expand((f) => ["-framework", f]).toList();
@@ -56,50 +110,15 @@ void main(List<String> args) async {
       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,
-        '-std=c++17',
-        "-lfilament",
-        "-lbackend",
-        "-lfilameshio",
-        "-lviewer",
-        "-lfilamat",
-        "-lgeometry",
-        "-lutils",
-        "-lfilabridge",
-        "-lgltfio_core",
-        "-lfilament-iblprefilter",
-        "-limage",
-        "-limageio",
-        "-ltinyexr",
-        "-lgltfio_core",
-        "-lfilaflat",
-        "-ldracodec",
-        "-libl",
-        "-lktxreader",
-        "-lpng",
-        "-lz",
-        "-lstb",
-        "-luberzlib",
-        "-lsmol-v",
-        "-luberarchive",
-        "-lzstd",
-        "-lstdc++",
-        if (platform == "macos") "-lbluegl",
-        if (platform == "macos") "-lbluevk",
-        "-lbasis_transcoder",
+        ...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));
+    }
   });
 }