Flutter图形渲染插件openworld_gl_macos的使用

Flutter图形渲染插件flutter_gl_macos的使用

flutter_gl_macos 是 macOS 平台上的实现，通过 Dart 的 dart:ffi 跨平台调用 OpenGL API。它在 Flutter 中提供了带有纹理的小部件。

示例代码

以下是一个完整的示例，展示如何在 Flutter 应用程序中使用 flutter_gl_macos 插件来创建一个简单的 OpenGL 渲染器。

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter GL macOS Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter GL macOS Demo'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  late FlutterGlPlugin glView;
  bool isInitialized = false;

  @override
  void initState() {
    super.initState();
    glView = FlutterGlPlugin();
    initPlatformState();
  }

  // 初始化 OpenGL 视图
  Future<void> initPlatformState() async {
    await glView.initialize(
      options: {
        "antialias": true,
        "alpha": true,
        "depth": true,
        "stencil": true,
        "width": 800,
        "height": 600,
        "color": 0xFFFFFFFF,
      },
    );
    setState(() {
      isInitialized = true;
    });
  }

  // 渲染函数
  void render() {
    if (!isInitialized) {
      return;
    }

    glView.render((gl) {
      // 清除颜色缓冲区和深度缓冲区
      gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT);
      // 设置背景颜色为蓝色
      gl.glClearColor(0.0, 0.0, 1.0, 1.0);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: isInitialized
            ? Container(
                width: 800,
                height: 600,
                child: glView,
              )
            : CircularProgressIndicator(),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          render();
        },
        tooltip: 'Render',
        child: Icon(Icons.refresh),
      ),
    );
  }
}

步骤说明

1. 导入必要的库:

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

2. 初始化应用:

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

3. 定义主页面:

   class MyApp extends StatelessWidget {
     @override
     Widget build(BuildContext context) {
       return MaterialApp(
         title: 'Flutter GL macOS Demo',
         theme: ThemeData(
           primarySwatch: Colors.blue,
         ),
         home: MyHomePage(title: 'Flutter GL macOS Demo'),
       );
     }
   }
   

4. 定义状态管理类:

   class MyHomePage extends StatefulWidget {
     MyHomePage({Key? key, required this.title}) : super(key: key);
   
     final String title;
   
     @override
     _MyHomePageState createState() => _MyHomePageState();
   }
   

5. 实现渲染逻辑:

   class _MyHomePageState extends State<MyHomePage> {
     late FlutterGlPlugin glView;
     bool isInitialized = false;
   
     @override
     void initState() {
       super.initState();
       glView = FlutterGlPlugin();
       initPlatformState();
     }
   
     // 初始化 OpenGL 视图
     Future<void> initPlatformState() async {
       await glView.initialize(
         options: {
           "antialias": true,
           "alpha": true,
           "depth": true,
           "stencil": true,
           "width": 800,
           "height": 600,
           "color": 0xFFFFFFFF,
         },
       );
       setState(() {
         isInitialized = true;
       });
     }
   
     // 渲染函数
     void render() {
       if (!isInitialized) {
         return;
       }
   
       glView.render((gl) {
         // 清除颜色缓冲区和深度缓冲区
         gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT);
         // 设置背景颜色为蓝色
         gl.glClearColor(0.0, 0.0, 1.0, 1.0);
       });
     }
   
     @override
     Widget build(BuildContext context) {
       return Scaffold(
         appBar: AppBar(
           title: Text(widget.title),
         ),
         body: Center(
           child: isInitialized
               ? Container(
                   width: 800,
                   height: 600,
                   child: glView,
                 )
               : CircularProgressIndicator(),
         ),
         floatingActionButton: FloatingActionButton(
           onPressed: () {
             render();
           },
           tooltip: 'Render',
           child: Icon(Icons.refresh),
         ),
       );
     }
   }