shady 2.2.0

shady: ^2.2.0 copied to clipboard

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:shady/shady.dart';

final shaderToyShaders = [
  Shady(assetName: 'assets/shaders/st3.frag', shaderToy: true),
  Shady(assetName: 'assets/shaders/st0.frag', shaderToy: true),
  Shady(assetName: 'assets/shaders/st2.frag', shaderToy: true),
  Shady(assetName: 'assets/shaders/st4.frag', shaderToy: true),
  Shady(assetName: 'assets/shaders/st6.frag', shaderToy: true),
  Shady(assetName: 'assets/shaders/st7.frag', shaderToy: true),
  Shady(assetName: 'assets/shaders/st8.frag', shaderToy: true),
  Shady(assetName: 'assets/shaders/st9.frag', shaderToy: true),
  Shady(assetName: 'assets/shaders/st5.frag', shaderToy: true),
  Shady(assetName: 'assets/shaders/st1.frag', shaderToy: true),
];

final imageShaders = [
  // Image shaders
  Shady(
    assetName: 'assets/shaders/img0.frag',
    uniforms: [
      UniformFloat(
        key: 'time',
        transformer: UniformFloat.secondsPassed,
      ),
      UniformVec3(
        key: 'resolution',
        transformer: UniformVec3.resolution,
      ),
    ],
    samplers: [
      TextureSampler(
        key: 'cat',
        asset: 'assets/textures/cat.png',
      ),
    ],
  ),
];

final interactiveShaders = [
  Shady(
    assetName: 'assets/shaders/it0.frag',
    uniforms: [
      UniformFloat(key: 'time', transformer: UniformFloat.secondsPassed),
      UniformVec3(key: 'resolution', transformer: UniformVec3.resolution),
      UniformVec2(key: 'inputCoord'),
      UniformFloat(key: 'intensity', initialValue: 0.5)
    ],
  ),
  Shady(
    assetName: 'assets/shaders/it1.frag',
    uniforms: [
      UniformFloat(key: 'time', transformer: UniformFloat.secondsPassed),
      UniformVec3(key: 'resolution', transformer: UniformVec3.resolution),
      UniformVec2(key: 'inputCoord'),
      UniformFloat(key: 'intensity', initialValue: 0.5)
    ],
  ),
];

class GalleryPage extends StatefulWidget {
  final String title;
  final List<Shady> shadys;
  final Widget Function(BuildContext context, Shady shady) shadyBuilder;

  const GalleryPage({
    required this.title,
    required this.shadyBuilder,
    required this.shadys,
    super.key,
  });

  @override
  State<GalleryPage> createState() => _GalleryPageState();
}

class _GalleryPageState extends State<GalleryPage> {
  var _index = 0;
  var _tickerEnabled = true;

  void _nextShader() {
    setState(() => _index = (_index + 1) % widget.shadys.length);
  }

  void toggleTickerMode() {
    setState(() => _tickerEnabled = !_tickerEnabled);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
        centerTitle: true,
        actions: [
          IconButton(
            icon: Icon(_tickerEnabled ? Icons.pause : Icons.play_arrow),
            onPressed: toggleTickerMode,
          ),
        ],
      ),
      body: TickerMode(
        enabled: _tickerEnabled,
        child: Builder(builder: (context) {
          return Stack(
            children: [
              Positioned.fill(
                child: widget.shadyBuilder(
                  context,
                  widget.shadys[_index],
                ),
              ),
              Positioned(
                bottom: 20,
                left: 10,
                right: 10,
                child: Padding(
                  padding: const EdgeInsets.all(8),
                  child: Row(
                    children: [
                      Slider(
                        min: -2,
                        max: 3,
                        value: widget.shadys[_index].timeMod,
                        onChanged: (v) => setState(() => widget.shadys[_index].timeMod = v),
                      ),
                      ElevatedButton(
                        onPressed: _nextShader,
                        child: const Text('Next'),
                      ),
                    ],
                  ),
                ),
              ),
            ],
          );
        }),
      ),
      key: ValueKey(widget.shadys[_index]),
    );
  }
}

class PageButton extends StatelessWidget {
  final String title;
  final Widget Function(BuildContext context, Shady shady) shadyBuilder;
  final List<Shady> shadys;

  const PageButton({
    required this.title,
    required this.shadyBuilder,
    required this.shadys,
    super.key,
  });

  @override
  Widget build(BuildContext context) {
    return ElevatedButton(
      child: Text(title),
      onPressed: () => Navigator.of(context).push(
        MaterialPageRoute(
          builder: (_) => GalleryPage(
            title: title,
            shadyBuilder: shadyBuilder,
            shadys: shadys,
          ),
        ),
      ),
    );
  }
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  int? screen;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Shady example',
      theme: ThemeData.dark(),
      home: ColoredBox(
        color: Colors.black,
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            PageButton(
              title: 'Shadertoy samples',
              shadyBuilder: (context, shady) => ShadyCanvas(shady),
              shadys: shaderToyShaders,
            ),
            PageButton(
              title: 'Image samples',
              shadyBuilder: (context, shady) => ShadyCanvas(shady),
              shadys: imageShaders,
            ),
            PageButton(
              title: 'Interactive samples',
              shadyBuilder: (context, shady) => ShadyInteractive(
                shady,
                uniformVec2Key: 'inputCoord',
              ),
              shadys: interactiveShaders,
            ),
          ],
        ),
      ),
    );
  }
}

void main() {
  runApp(const MyApp());
}