Shaders: Anime4K presets in-session and in Settings
Vendored Anime4K v4.0.1 GLSL (MIT), extracted to app support once per version. Presets A/B/C/A+A/B+B/C+A in HQ and Fast per Anime4K's mpv templates, plus custom files. Shader button in the video controls (works in fullscreen), Ctrl+1..6 / Ctrl+0, live apply with read-back, failures fall back to Off with a toast. Render mode detected from mpv's GL log; warns when on the software path. Docs include the Jellyfin client section. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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import 'dart:io';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:hive_ce/hive.dart';
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import 'package:watch_together/src/shaders/shader_assets.dart';
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import 'package:watch_together/src/shaders/shader_presets.dart';
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import 'package:watch_together/src/state/settings.dart';
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final _tmp = Platform.environment['WT_TEST_TMP'] ?? Directory.systemTemp.path;
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// Anime4K v4.0.1 md/Template/GLSL_Mac_Linux_{High,Low}-end/input.conf,
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// Ctrl+1..6, with "~~/shaders/" stripped.
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const _high = [
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'Anime4K_Clamp_Highlights.glsl:Anime4K_Restore_CNN_VL.glsl:Anime4K_Upscale_CNN_x2_VL.glsl:Anime4K_AutoDownscalePre_x2.glsl:Anime4K_AutoDownscalePre_x4.glsl:Anime4K_Upscale_CNN_x2_M.glsl',
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'Anime4K_Clamp_Highlights.glsl:Anime4K_Restore_CNN_Soft_VL.glsl:Anime4K_Upscale_CNN_x2_VL.glsl:Anime4K_AutoDownscalePre_x2.glsl:Anime4K_AutoDownscalePre_x4.glsl:Anime4K_Upscale_CNN_x2_M.glsl',
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'Anime4K_Clamp_Highlights.glsl:Anime4K_Upscale_Denoise_CNN_x2_VL.glsl:Anime4K_AutoDownscalePre_x2.glsl:Anime4K_AutoDownscalePre_x4.glsl:Anime4K_Upscale_CNN_x2_M.glsl',
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'Anime4K_Clamp_Highlights.glsl:Anime4K_Restore_CNN_VL.glsl:Anime4K_Upscale_CNN_x2_VL.glsl:Anime4K_Restore_CNN_M.glsl:Anime4K_AutoDownscalePre_x2.glsl:Anime4K_AutoDownscalePre_x4.glsl:Anime4K_Upscale_CNN_x2_M.glsl',
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'Anime4K_Clamp_Highlights.glsl:Anime4K_Restore_CNN_Soft_VL.glsl:Anime4K_Upscale_CNN_x2_VL.glsl:Anime4K_AutoDownscalePre_x2.glsl:Anime4K_AutoDownscalePre_x4.glsl:Anime4K_Restore_CNN_Soft_M.glsl:Anime4K_Upscale_CNN_x2_M.glsl',
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'Anime4K_Clamp_Highlights.glsl:Anime4K_Upscale_Denoise_CNN_x2_VL.glsl:Anime4K_AutoDownscalePre_x2.glsl:Anime4K_AutoDownscalePre_x4.glsl:Anime4K_Restore_CNN_M.glsl:Anime4K_Upscale_CNN_x2_M.glsl',
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];
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const _low = [
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'Anime4K_Clamp_Highlights.glsl:Anime4K_Restore_CNN_M.glsl:Anime4K_Upscale_CNN_x2_M.glsl:Anime4K_AutoDownscalePre_x2.glsl:Anime4K_AutoDownscalePre_x4.glsl:Anime4K_Upscale_CNN_x2_S.glsl',
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'Anime4K_Clamp_Highlights.glsl:Anime4K_Restore_CNN_Soft_M.glsl:Anime4K_Upscale_CNN_x2_M.glsl:Anime4K_AutoDownscalePre_x2.glsl:Anime4K_AutoDownscalePre_x4.glsl:Anime4K_Upscale_CNN_x2_S.glsl',
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'Anime4K_Clamp_Highlights.glsl:Anime4K_Upscale_Denoise_CNN_x2_M.glsl:Anime4K_AutoDownscalePre_x2.glsl:Anime4K_AutoDownscalePre_x4.glsl:Anime4K_Upscale_CNN_x2_S.glsl',
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'Anime4K_Clamp_Highlights.glsl:Anime4K_Restore_CNN_M.glsl:Anime4K_Upscale_CNN_x2_M.glsl:Anime4K_Restore_CNN_S.glsl:Anime4K_AutoDownscalePre_x2.glsl:Anime4K_AutoDownscalePre_x4.glsl:Anime4K_Upscale_CNN_x2_S.glsl',
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'Anime4K_Clamp_Highlights.glsl:Anime4K_Restore_CNN_Soft_M.glsl:Anime4K_Upscale_CNN_x2_M.glsl:Anime4K_AutoDownscalePre_x2.glsl:Anime4K_AutoDownscalePre_x4.glsl:Anime4K_Restore_CNN_Soft_S.glsl:Anime4K_Upscale_CNN_x2_S.glsl',
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'Anime4K_Clamp_Highlights.glsl:Anime4K_Upscale_Denoise_CNN_x2_M.glsl:Anime4K_AutoDownscalePre_x2.glsl:Anime4K_AutoDownscalePre_x4.glsl:Anime4K_Restore_CNN_S.glsl:Anime4K_Upscale_CNN_x2_S.glsl',
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];
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Directory _fresh(String name) {
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final d = Directory('$_tmp/$name');
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if (d.existsSync()) d.deleteSync(recursive: true);
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return d..createSync(recursive: true);
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}
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void main() {
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test('presets match the Anime4K mpv templates file for file', () {
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for (final (i, mode) in ShaderPreset.modes.indexed) {
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expect(anime4kFiles(mode, ShaderQuality.hq).join(':'), _high[i],
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reason: '${mode.label} HQ');
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expect(anime4kFiles(mode, ShaderQuality.fast).join(':'), _low[i],
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reason: '${mode.label} Fast');
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}
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expect(anime4kFiles(ShaderPreset.off, ShaderQuality.hq), isEmpty);
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expect(anime4kFiles(ShaderPreset.custom, ShaderQuality.fast), isEmpty);
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expect(shaderLabel(ShaderPreset.a, ShaderQuality.hq), 'Mode A (HQ)');
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expect(shaderLabel(ShaderPreset.ca, ShaderQuality.fast), 'Mode C+A (Fast)');
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expect(shaderLabel(ShaderPreset.off, ShaderQuality.fast), 'Off');
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});
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test('the asset dir ships exactly the files the presets need', () {
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final shipped = Directory(anime4kAssetDir)
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.listSync()
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.map((e) => e.uri.pathSegments.last)
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.where((n) => n.endsWith('.glsl'))
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.toList()
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..sort();
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expect(shipped, anime4kAllFiles);
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expect(File('$anime4kAssetDir/LICENSE').readAsStringSync(),
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contains('MIT License'));
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});
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test('path list separator per platform', () {
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expect(shaderListSeparator(windows: false), ':');
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expect(shaderListSeparator(windows: true), ';');
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expect(joinShaderPaths(['/a/x.glsl', '/b/y.glsl'], windows: false),
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'/a/x.glsl:/b/y.glsl');
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expect(joinShaderPaths([r'C:\s\x.glsl', r'D:\y.glsl'], windows: true),
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r'C:\s\x.glsl;D:\y.glsl');
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expect(joinShaderPaths([], windows: false), '');
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});
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test('path problems: missing file, separator inside a path', () {
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final d = _fresh('shaders_problem');
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final ok = File('${d.path}/ok.glsl')..writeAsStringSync('//');
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final colon = File('${d.path}/a:b.glsl')..writeAsStringSync('//');
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expect(shaderPathsProblem([ok.path], windows: false), isNull);
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expect(shaderPathsProblem([ok.path, '${d.path}/gone.glsl'], windows: false),
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'"gone.glsl" not found');
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expect(shaderPathsProblem([colon.path], windows: false), contains('":"'));
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expect(shaderPathsProblem([colon.path], windows: true), isNull);
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});
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group('asset extraction', () {
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TestWidgetsFlutterBinding.ensureInitialized();
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test('copies the bundle once per version, redoes a broken copy', () async {
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final support = _fresh('shaders_support');
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final dir = await extractAnime4k(support);
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expect(dir.path, endsWith('shaders/anime4k-$anime4kVersion'));
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for (final f in [...anime4kAllFiles, 'LICENSE']) {
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expect(File('${dir.path}/$f').readAsBytesSync(),
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File('$anime4kAssetDir/$f').readAsBytesSync(),
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reason: f);
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}
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// Second run is a no-op: a marker-tagged copy stays untouched.
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final probe = File('${dir.path}/${anime4kAllFiles.first}')
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..writeAsStringSync('touched');
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await extractAnime4k(support);
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expect(probe.readAsStringSync(), 'touched');
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// A missing file means a broken copy: everything is rewritten.
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File('${dir.path}/${anime4kAllFiles.last}').deleteSync();
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await extractAnime4k(support);
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expect(File('${dir.path}/${anime4kAllFiles.last}').existsSync(), isTrue);
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expect(probe.readAsStringSync(), isNot('touched'));
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shaderSupportDir = () async => support;
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final paths =
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await shaderPathsFor(ShaderPreset.b, ShaderQuality.fast, const []);
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expect(paths.map((p) => p.split('/').last).join(':'), _low[1]);
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expect(shaderPathsProblem(paths), isNull);
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expect(await shaderPathsFor(ShaderPreset.off, ShaderQuality.hq, ['/x']),
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isEmpty);
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expect(await shaderPathsFor(ShaderPreset.custom, ShaderQuality.hq, ['/x']),
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['/x']);
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});
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});
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test('shader settings persist across a reload', () async {
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Hive.init(_fresh('shaders_hive').path);
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final a = AppSettings();
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await a.ensureLoaded();
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expect(a.shaderPreset.value, ShaderPreset.off);
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expect(a.shaderQuality.value, ShaderQuality.hq);
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expect(a.customShaders.value, isEmpty);
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a.setShaderPreset(ShaderPreset.bb);
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a.setShaderQuality(ShaderQuality.fast);
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a.setCustomShaders(['/s/one.glsl', '/s/two.glsl']);
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await Future.delayed(const Duration(milliseconds: 100));
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await Hive.close();
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final b = AppSettings();
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await b.ensureLoaded();
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expect(b.shaderPreset.value, ShaderPreset.bb);
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expect(b.shaderQuality.value, ShaderQuality.fast);
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expect(b.customShaders.value, ['/s/one.glsl', '/s/two.glsl']);
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await Hive.close();
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});
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}
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