Add simple_shader (#1668)

* Add `simple_shader` * Add NL at EOF * Adopt `analysis_defaults` * Update simple_shader/shaders/simple.frag Co-authored-by: Jonah Williams <jonahwilliams@google.com> * Update simple_shader/shaders/simple.frag Co-authored-by: Jonah Williams <jonahwilliams@google.com> * Update simple_shader/shaders/simple.frag Co-authored-by: Jonah Williams <jonahwilliams@google.com> * Update simple_shader/shaders/simple.frag Co-authored-by: Jonah Williams <jonahwilliams@google.com> * Update simple_shader/shaders/simple.frag Co-authored-by: Jonah Williams <jonahwilliams@google.com> * Update simple_shader/shaders/simple.frag Co-authored-by: Jonah Williams <jonahwilliams@google.com> * Update simple_shader/shaders/simple.frag Co-authored-by: Jonah Williams <jonahwilliams@google.com> * Update simple_shader/shaders/simple.frag Co-authored-by: Jonah Williams <jonahwilliams@google.com> * Apply `clang-format` to `shaders/simple.frag` --------- Co-authored-by: Jonah Williams <jonahwilliams@google.com>
2025-11-09 06:18:49 +00:00 · 2023-02-24 11:01:10 +11:00
parent 5c644ae6dc
commit 0b8be3e43f
120 changed files with 4142 additions and 0 deletions
--- a/simple_shader/lib/main.dart
+++ b/simple_shader/lib/main.dart
@@ -0,0 +1,88 @@
+import 'dart:ui' as ui;
+
+import 'package:flutter/material.dart';
+
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Simple Shader Demo',
+      theme: ThemeData(
+        primarySwatch: Colors.blue,
+        useMaterial3: true,
+      ),
+      home: const MyHomePage(),
+    );
+  }
+}
+
+class MyHomePage extends StatefulWidget {
+  const MyHomePage({super.key});
+
+  @override
+  State<MyHomePage> createState() => _MyHomePageState();
+}
+
+class _MyHomePageState extends State<MyHomePage> {
+  late Future<ui.FragmentProgram> program;
+
+  @override
+  void initState() {
+    super.initState();
+    program = ui.FragmentProgram.fromAsset('shaders/simple.frag');
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Simple Shader'),
+      ),
+      body: FutureBuilder<ui.FragmentProgram>(
+        future: program,
+        builder: (context, snapshot) {
+          if (snapshot.hasData) {
+            return CustomPaint(
+              size: MediaQuery.of(context).size,
+              painter: ShaderPainter(
+                shader: snapshot.data!.fragmentShader(),
+              ),
+            );
+          }
+          if (snapshot.hasError) {
+            return Center(child: Text('${snapshot.error}'));
+          }
+          return const Center(child: CircularProgressIndicator());
+        },
+      ),
+    );
+  }
+}
+
+class ShaderPainter extends CustomPainter {
+  ShaderPainter({required this.shader});
+  ui.FragmentShader shader;
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    shader.setFloat(0, size.width);
+    shader.setFloat(1, 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;
+  }
+}