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flutter/flutter#193388 and #193389: reproductions

• coord.frag encodes FlutterFragCoord() in red and green (one period per 8 px), so every pixel's expected value is known.
• repro_193388.dart is the reproduction from #193388, verbatim.
• sweep.dart sweeps the fractional part of the rect's origin and prints the mean offset, in px, between the coordinate the shader saw and the pixel centre. It covers pixels at least 2 px inside a 40×16 rect. The SDF arm is the default isAntiAlias = true. The direct arm is isAntiAlias = false with the #193388 primer. The last column counts pixels where the two arms differ.

Setup: flutter create --platforms=macos --empty repro, put coord.frag in shaders/, and add to pubspec.yaml:

flutter:

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Dart vs TypeScript для WebGPU-игры на three.js

Сравнение TypeScript (Bun), Dart→JS (dart2js) и Dart→WASM (dart2wasm) как host-языков, гоняющих настоящий three.js WebGPURenderer. Все реализации крутят один и тот же движок; three.js — идентичное tree-shaken подмножество, так что разница в размере = код приложения + рантайм языка, а разница в CPU-времени = host-язык (GPU-путь общий).

Dart-сторона использует extension type + dart:js_interop поверх globalThis.THREE (ручные биндинги). TS импортирует three/webgpu напрямую.

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#!/usr/bin/env bash
# Clean build/cache directories for Dart, TS, Rust and other common tooling.
# Usage:
#   ./clean-builds.sh            # dry-run: shows what would be deleted and total size
#   ./clean-builds.sh --apply    # actually delete
#   ./clean-builds.sh --apply -y # delete without confirmation

set -euo pipefail

ROOT="${ROOT:-$(pwd)}"

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ChatScrollView vs ListView.builder — Benchmark Report

Environment

• Flutter 3.32.2, Dart 3.8.2, macOS ARM64
• Viewport: 400x800 logical pixels
• Test runner: flutter test (headless, no GPU compositing)
• Date: 2026-04-08
• 42 tests, all passing

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/*
 * Sunflower V2 — 100K animated dots on a single layer with spring physics.
 * https://gist.github.com/PlugFox/0a0ee8ba7dc3679b86f2d8b4aab01569
 * https://dartpad.dev?id=0a0ee8ba7dc3679b86f2d8b4aab01569
 * Mike Matiunin <plugfox@gmail.com>, 26 March 2026
 */

//ignore_for_file: curly_braces_in_flow_control_structures

import 'dart:async';

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import 'dart:typed_data';

/// Пул объектов с целочисленными идентификаторами и переиспользованием ID.
///
/// Внутреннее устройство (sparse-set + recycle-stack):
///
///  ┌─────────┐        ┌─────────┐
///  │ sparse  │ id ──▶ │  dense  │  dense idx ──▶ data[idx]
///  │Uint32List│        │Uint32List│
///  └─────────┘        └─────────┘

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/*
 * Form State Management
 * https://gist.github.com/PlugFox/eed8aaa9fe83a032f17139e8b1814986
 * https://dartpad.dev/?id=eed8aaa9fe83a032f17139e8b1814986
 */

import 'package:flutter/material.dart';

void main() {
  runApp(const App());

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/*
 * Password validation
 * https://gist.github.com/PlugFox/b6aa1d256e6900424c74aa75136c9aef
 * https://dartpad.dev?id=b6aa1d256e6900424c74aa75136c9aef
 * Mike Matiunin <plugfox@gmail.com>, 17 March 2026
 */

// ignore_for_file: curly_braces_in_flow_control_structures

void main() {

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/*
 * SliverLayout
 * https://gist.github.com/PlugFox/53636071587beeff1527f1ff48e5a969
 * https://dartpad.dev?id=53636071587beeff1527f1ff48e5a969
 * Mike Matiunin <plugfox@gmail.com>, 13 March 2026
 */

// ignore_for_file: library_private_types_in_public_api

import 'dart:math' as math;

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import 'dart:convert';
import 'dart:io' as io;

import 'package:http/http.dart' as http;

final $log = io.stdout.writeln; // Log to stdout
final $err = io.stderr.writeln; // Log to stderr

void main() => Future<void>(() async {
  const appId = "6743122346"; // Doctorina app ID on the App Store, without the 'id' prefix