When Impeller is enabled for flutter tester choose correct shader target. (#141391)

When compiling shaders for flutter tester, include Vulkan shaders when targeting Impeller.

packages/flutter_tools/lib/src/build_system/targets/shader_compiler.dart

@@ -24,6 +24,7 @@ import '../build_system.dart';
 enum ShaderTarget {
   impellerAndroid(<String>['--runtime-stage-gles', '--runtime-stage-vulkan']),
   impelleriOS(<String>['--runtime-stage-metal']),
+  impellerSwiftShader(<String>['--runtime-stage-vulkan']),
   sksl(<String>['--sksl']);
 
   const ShaderTarget(this.stages);
@@ -71,8 +72,9 @@ class DevelopmentShaderCompiler {
       case TargetPlatform.fuchsia_arm64:
       case TargetPlatform.fuchsia_x64:
       case TargetPlatform.tester:
-        assert(impellerStatus != ImpellerStatus.enabled);
-        _shaderTarget = ShaderTarget.sksl;
+        _shaderTarget =  impellerStatus == ImpellerStatus.enabled
+          ? ShaderTarget.impellerSwiftShader
+          : ShaderTarget.sksl;
       case TargetPlatform.web_javascript:
         assert(impellerStatus != ImpellerStatus.enabled);
         _shaderTarget = ShaderTarget.sksl;

packages/flutter_tools/lib/src/bundle_builder.dart

@@ -18,6 +18,7 @@ import 'build_system/targets/shader_compiler.dart';
 import 'bundle.dart';
 import 'cache.dart';
 import 'devfs.dart';
+import 'device.dart';
 import 'globals.dart' as globals;
 import 'project.dart';
 
@@ -140,6 +141,7 @@ Future<void> writeBundle(
   Map<String, AssetKind> entryKinds, {
   Logger? loggerOverride,
   required TargetPlatform targetPlatform,
+  required ImpellerStatus impellerStatus,
 }) async {
   loggerOverride ??= globals.logger;
   if (bundleDir.existsSync()) {
@@ -168,6 +170,11 @@ Future<void> writeBundle(
     artifacts: globals.artifacts!,
   );
 
+  ShaderTarget shaderTarget = ShaderTarget.sksl;
+  if (targetPlatform == TargetPlatform.tester && impellerStatus == ImpellerStatus.enabled) {
+    shaderTarget = ShaderTarget.impellerSwiftShader;
+  }
+
   // Limit number of open files to avoid running out of file descriptors.
   final Pool pool = Pool(64);
   await Future.wait<void>(
@@ -195,7 +202,7 @@ Future<void> writeBundle(
               doCopy = !await shaderCompiler.compileShader(
                 input: input,
                 outputPath: file.path,
-                target: ShaderTarget.sksl, // TODO(zanderso): configure impeller target when enabled.
+                target: shaderTarget,
                 json: targetPlatform == TargetPlatform.web_javascript,
               );
             case AssetKind.model:

packages/flutter_tools/lib/src/commands/test.dart

@@ -345,13 +345,6 @@ class TestCommand extends FlutterCommand with DeviceBasedDevelopmentArtifacts {
       );
     }
 
-    String? testAssetDirectory;
-    if (buildTestAssets) {
-      await _buildTestAsset(flavor: buildInfo.flavor);
-      testAssetDirectory = globals.fs.path.
-        join(flutterProject.directory.path, 'build', 'unit_test_assets');
-    }
-
     final bool startPaused = boolArg('start-paused');
     if (startPaused && _testFileUris.length != 1) {
       throwToolExit(
@@ -360,6 +353,26 @@ class TestCommand extends FlutterCommand with DeviceBasedDevelopmentArtifacts {
       );
     }
 
+    final DebuggingOptions debuggingOptions = DebuggingOptions.enabled(
+      buildInfo,
+      startPaused: startPaused,
+      disableServiceAuthCodes: boolArg('disable-service-auth-codes'),
+      serveObservatory: boolArg('serve-observatory'),
+      // On iOS >=14, keeping this enabled will leave a prompt on the screen.
+      disablePortPublication: true,
+      enableDds: enableDds,
+      nullAssertions: boolArg(FlutterOptions.kNullAssertions),
+      usingCISystem: usingCISystem,
+      enableImpeller: ImpellerStatus.fromBool(argResults!['enable-impeller'] as bool?),
+    );
+
+    String? testAssetDirectory;
+    if (buildTestAssets) {
+      await _buildTestAsset(flavor: buildInfo.flavor, impellerStatus: debuggingOptions.enableImpeller);
+      testAssetDirectory = globals.fs.path.
+        join(flutterProject.directory.path, 'build', 'unit_test_assets');
+    }
+
     final String? concurrencyString = stringArg('concurrency');
     int? jobs = concurrencyString == null ? null : int.tryParse(concurrencyString);
     if (jobs != null && (jobs <= 0 || !jobs.isFinite)) {
@@ -427,19 +440,6 @@ class TestCommand extends FlutterCommand with DeviceBasedDevelopmentArtifacts {
       watcher = collector;
     }
 
-    final DebuggingOptions debuggingOptions = DebuggingOptions.enabled(
-      buildInfo,
-      startPaused: startPaused,
-      disableServiceAuthCodes: boolArg('disable-service-auth-codes'),
-      serveObservatory: boolArg('serve-observatory'),
-      // On iOS >=14, keeping this enabled will leave a prompt on the screen.
-      disablePortPublication: true,
-      enableDds: enableDds,
-      nullAssertions: boolArg(FlutterOptions.kNullAssertions),
-      usingCISystem: usingCISystem,
-      enableImpeller: ImpellerStatus.fromBool(argResults!['enable-impeller'] as bool?),
-    );
-
     Device? integrationTestDevice;
     if (_isIntegrationTest) {
       integrationTestDevice = await findTargetDevice();
@@ -569,6 +569,7 @@ class TestCommand extends FlutterCommand with DeviceBasedDevelopmentArtifacts {
 
   Future<void> _buildTestAsset({
     required String? flavor,
+    required ImpellerStatus impellerStatus,
   }) async {
     final AssetBundle assetBundle = AssetBundleFactory.instance.createBundle();
     final int build = await assetBundle.build(
@@ -584,6 +585,7 @@ class TestCommand extends FlutterCommand with DeviceBasedDevelopmentArtifacts {
         assetBundle.entries,
         assetBundle.entryKinds,
         targetPlatform: TargetPlatform.tester,
+        impellerStatus: impellerStatus,
       );
     }
   }

packages/flutter_tools/lib/src/isolated/devfs_web.dart

@@ -32,6 +32,7 @@ import '../compile.dart';
 import '../convert.dart';
 import '../dart/package_map.dart';
 import '../devfs.dart';
+import '../device.dart';
 import '../globals.dart' as globals;
 import '../html_utils.dart';
 import '../project.dart';
@@ -885,6 +886,7 @@ class WebDevFS implements DevFS {
           bundle.entries,
           bundle.entryKinds,
           targetPlatform: TargetPlatform.web_javascript,
+          impellerStatus: ImpellerStatus.disabled,
         );
       }
     }

packages/flutter_tools/test/general.shard/asset_bundle_test.dart

@@ -16,6 +16,7 @@ import 'package:flutter_tools/src/build_info.dart';
 import 'package:flutter_tools/src/bundle_builder.dart';
 import 'package:flutter_tools/src/cache.dart';
 import 'package:flutter_tools/src/devfs.dart';
+import 'package:flutter_tools/src/device.dart';
 import 'package:flutter_tools/src/globals.dart' as globals;
 import 'package:flutter_tools/src/project.dart';
 import 'package:standard_message_codec/standard_message_codec.dart';
@@ -622,6 +623,7 @@ flutter:
       <String, AssetKind>{},
       loggerOverride: testLogger,
       targetPlatform: TargetPlatform.android,
+      impellerStatus: ImpellerStatus.disabled,
     );
 
     expect(testLogger.warningText, contains('Expected Error Text'));
@@ -744,6 +746,7 @@ flutter:
         bundle.entryKinds,
         loggerOverride: testLogger,
         targetPlatform: TargetPlatform.android,
+        impellerStatus: ImpellerStatus.disabled,
       );
 
     }, overrides: <Type, Generator>{
@@ -790,6 +793,7 @@ flutter:
         bundle.entryKinds,
         loggerOverride: testLogger,
         targetPlatform: TargetPlatform.web_javascript,
+        impellerStatus: ImpellerStatus.disabled,
       );
 
     }, overrides: <Type, Generator>{
@@ -873,6 +877,7 @@ flutter:
         bundle.entryKinds,
         loggerOverride: testLogger,
         targetPlatform: TargetPlatform.web_javascript,
+        impellerStatus: ImpellerStatus.disabled,
       );
       expect((globals.processManager as FakeProcessManager).hasRemainingExpectations, false);
     }, overrides: <Type, Generator>{

packages/flutter_tools/test/general.shard/build_system/targets/shader_compiler_test.dart

@@ -287,6 +287,53 @@ void main() {
     expect(fileSystem.file('/.tmp_rand0/0.8255140718871702.temp'), isNot(exists));
   });
 
+  testWithoutContext('DevelopmentShaderCompiler can compile for Flutter Tester with Impeller and Vulkan', () async {
+    final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
+      FakeCommand(
+        command: <String>[
+          impellerc,
+          '--runtime-stage-vulkan',
+          '--iplr',
+          '--sl=/.tmp_rand0/0.8255140718871702.temp',
+          '--spirv=/.tmp_rand0/0.8255140718871702.temp.spirv',
+          '--input=$fragPath',
+          '--input-type=frag',
+          '--include=$fragDir',
+          '--include=$shaderLibDir',
+        ],
+        onRun: () {
+          fileSystem.file('/.tmp_rand0/0.8255140718871702.temp.spirv').createSync();
+          fileSystem.file('/.tmp_rand0/0.8255140718871702.temp')
+            ..createSync()
+            ..writeAsBytesSync(<int>[1, 2, 3, 4]);
+        }
+      ),
+    ]);
+    fileSystem.file(fragPath).writeAsBytesSync(<int>[1, 2, 3, 4]);
+    final ShaderCompiler shaderCompiler = ShaderCompiler(
+      processManager: processManager,
+      logger: logger,
+      fileSystem: fileSystem,
+      artifacts: artifacts,
+    );
+    final DevelopmentShaderCompiler developmentShaderCompiler = DevelopmentShaderCompiler(
+      shaderCompiler: shaderCompiler,
+      fileSystem: fileSystem,
+      random: math.Random(0),
+    );
+
+    developmentShaderCompiler.configureCompiler(
+      TargetPlatform.tester,
+      impellerStatus: ImpellerStatus.enabled,
+    );
+
+    final DevFSContent? content = await developmentShaderCompiler
+      .recompileShader(DevFSFileContent(fileSystem.file(fragPath)));
+
+    expect(await content!.contentsAsBytes(), <int>[1, 2, 3, 4]);
+    expect(processManager.hasRemainingExpectations, false);
+  });
+
   testWithoutContext('DevelopmentShaderCompiler can compile for android with impeller', () async {
     final FakeProcessManager processManager = FakeProcessManager.list(<FakeCommand>[
       FakeCommand(