🎵 gd-empd Interactive Examples

Run Pure Data patches directly in your web browser!

This is the interactive demo collection for gd-empd - a GDExtension that embeds Pure Data (Pd) into Godot Engine with full WebAssembly support.

✨ What You'll Experience

🤖 Auto-Generated UI Synth ⭐ Modern, responsive synthesizer with UI automatically generated from Pure Data metadata. Touch-optimized for mobile, adaptive for desktop. Zero manual UI coding - the patch defines its own interface!

🎹 MIDI Echo Test Bidirectional MIDI communication demonstrating hardware MIDI integration and real-time message routing.

🎛️ Simple Synth Basic parameter control with keyboard input showing fundamental Pd ↔ Godot communication patterns.

📁 Array & Wavetable Example Dynamic wavetable synthesis using Pure Data arrays, demonstrating memory-mapped DSP data structures.

🔊 Audio Sampler Full audio file loading and playback using Pure Data's [readsf~] object, enabled by SharedArrayBuffer in threaded WASM builds.

🚀 How It Works

This demo runs real Pure Data patches compiled to WebAssembly:

• ✅ Full Pd Vanilla DSP compatibility
• ✅ Sample-accurate audio processing
• ✅ Bidirectional control messaging
• ✅ MIDI event support
• ✅ Array/table operations
• ✅ Audio file I/O (threaded builds)

Press ESC in any example to return to the main menu.

🛠️ For Developers

Want to integrate Pure Data into your Godot project?

Features

• 🎯 PdNode - Auto-managing lifecycle (3-5 lines instead of 30+)
• 🎨 Auto-UI System - Patches define their own interface via metadata
• 📱 Mobile-First - Touch-optimized, responsive controls
• 🔧 Inspector Integration - Edit parameters in Godot editor
• 🌐 Universal - Identical behavior on desktop, mobile, and web
• 🔄 Hot Reload - File watching for rapid iteration (native builds)

Supported Platforms

• Desktop: macOS, Linux, Windows
• Mobile: iOS, Android
• Web: Chrome, Firefox, Safari (with SharedArrayBuffer)

Resources

• Documentation: Full guides and API reference
• Source Code: Codeberg 

• License: MIT

🎓 About Pure Data

Pure Data (Pd) is a visual programming language for real-time audio/DSP created by Miller Puckette. It's used worldwide for:

• Interactive audio applications
• Live performance systems
• Experimental music composition
• Audio research and education

gd-empd brings this powerful DSP environment into Godot, enabling game audio that's as flexible as your imagination.

Made with ❤️ using Godot Engine + Pure Data

This description:

• Highlights the demo's interactive nature
• Shows specific examples users can try
• Explains the technology (WebAssembly, threaded builds)
• Includes code snippets for developers
• Lists platform support
• Provides clear links to documentation
• Uses emojis for visual appeal (standard on itch.io)
• Emphasizes the "try it now" aspect while also appealing to developers who might want to use the tool