snapshot of https://github.com/flutter/samples.git (main, 2026-09-16; blobs > 131072B omitted)

simple_sdf/lib/main.dart

@@ -0,0 +1,65 @@
+// Copyright 2024 The Flutter team. 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:ui' as ui;
+
+import 'package:flutter/material.dart';
+import 'package:flutter_shaders/flutter_shaders.dart';
+
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Simple SDF Demo',
+      theme: ThemeData(colorSchemeSeed: Colors.blue),
+      home: const MyHomePage(),
+    );
+  }
+}
+
+class MyHomePage extends StatelessWidget {
+  const MyHomePage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Simple SDF Demo')),
+      body: ShaderBuilder(
+        assetKey: 'shaders/SDF.frag',
+        (context, shader, child) => CustomPaint(
+          size: MediaQuery.of(context).size,
+          painter: ShaderPainter(shader: shader),
+        ),
+        child: const Center(child: CircularProgressIndicator()),
+      ),
+    );
+  }
+}
+
+class ShaderPainter extends CustomPainter {
+  ShaderPainter({required this.shader})
+    : _resolution = shader.getUniformVec2('resolution');
+
+  final ui.FragmentShader shader;
+  final ui.UniformVec2Slot _resolution;
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    _resolution.set(size.width, size.height);
+
+    final paint = Paint()..shader = shader;
+    canvas.drawRect(Rect.fromLTWH(0, 0, size.width, size.height), paint);
+  }
+
+  @override
+  bool shouldRepaint(covariant CustomPainter oldDelegate) {
+    return false;
+  }
+}