holo_shiny

holo_shiny is a Flutter package that renders shader-driven holographic shine.

It exposes two widget layers:

• Shiny: apply shine to any widget (no clipping and no rotation)
• ShinyCard: card-oriented convenience widget with shape clipping and tilt rotation

Features

• GLSL shader-driven holographic effects
• Optional motion input via sensors or custom tilt stream
• Position-driven rendering: visuals respond to tilt/input position with no internal time animation
• Generic wrapper API for any widget via Shiny(child: ...)
• Card API with background, foreground, shape, and drag tilt via ShinyCard
• Four specialized material profiles backed by dedicated shader assets
• Global shader opacity control via opacity
• Cross-platform Flutter support (mobile, web, desktop)

Installation

Add the package:

dependencies:
  holo_shiny: ^0.1.0

Then run:

flutter pub get

Quick Start

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

class Demo extends StatelessWidget {
  const Demo({super.key});

  @override
  Widget build(BuildContext context) {
    return const Shiny(
      child: ColoredBox(
        color: Color(0xFF202A3A),
        child: SizedBox(width: 280, height: 80),
      ),
    );
  }
}

Card Usage

ShinyCard(
  controller: controller,
  background: Container(color: const Color(0xFF1B2D4B)),
  foreground: const Center(child: Text('HOLO')),
  profile: ShinyProfile.crackedIce,
  opacity: 1.0,
)

Motion with Controller

final ShinyController controller = ShinyController(useSensor: true);

Shiny(
  controller: controller,
  child: Container(color: const Color(0xFF1B2D4B)),
)

Profiles

Choose a precompiled material profile:

ShinyCard(
  profile: ShinyProfile.holographicSilver,
)

ShinyCard(
  profile: ShinyProfile.superGoldVinyl,
)

You can also provide a custom stream:

final StreamController<Offset> input = StreamController<Offset>.broadcast();
final ShinyController controller = ShinyController(tiltStream: input.stream);

API Summary

• Shiny: generic effect wrapper
• ShinyCard: shape + rotation + composition convenience widget
• ShinyProfile: specialized material presets mapped to dedicated shader assets
• ShinyController: optional source selection for tilt
• SensorTiltController: low-level sensor fusion stream utility

Important defaults:

• profile defaults to ShinyProfile.crackedIce
• opacity defaults to 1.0

Platform Notes

• Shader uses Flutter runtime effects and avoids derivative functions (dFdx, dFdy, fwidth) for web compatibility.
• Shader output is deterministic for a given input state and is driven by tilt/position values instead of a ticking time uniform.
• If a sensor is unavailable, motion input simply emits no events.

Example

See the package example app in example/ for:

• Basic usage
• Any-widget shiny wrapper usage
• Sensor-driven motion
• External stream override
• Custom card shape/background/foreground composition
• Profile switching in the demo UI

Publishing Notes

Replace placeholder package metadata URLs in pubspec.yaml before publishing.