https://github.com/olivierh59500/dma-is-back
This is a tribute to the golden era of the Atari ST demoscene
https://github.com/olivierh59500/dma-is-back
demoscene ebiten go golang
Last synced: 3 months ago
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This is a tribute to the golden era of the Atari ST demoscene
- Host: GitHub
- URL: https://github.com/olivierh59500/dma-is-back
- Owner: olivierh59500
- Created: 2025-06-07T19:59:40.000Z (4 months ago)
- Default Branch: main
- Last Pushed: 2025-06-07T20:31:24.000Z (4 months ago)
- Last Synced: 2025-06-07T21:26:40.451Z (4 months ago)
- Topics: demoscene, ebiten, go, golang
- Language: Go
- Homepage:
- Size: 103 KB
- Stars: 1
- Watchers: 0
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# DMA is Back! - Atari ST Demo Remake
**A modern Go/Ebiten remake of a classic Atari ST demoscene production**
[Live Demo](#live-demo) • [Features](#features) • [Installation](#installation) • [Building](#building) • [Credits](#credits)
---
## 🎮 Overview
This is a tribute to the golden era of the Atari ST demoscene, reimagined using modern technologies. The demo features the iconic "jelly cube" effect combined with parallax distortion scrolling, bringing classic 16-bit demo effects to contemporary platforms.
Originally inspired by demos from The Carebears (TCB), this remake showcases how timeless these visual effects remain, now running smoothly in your web browser or as a native application.
## ✨ Features
### Visual Effects
- **3D Jelly Cube**: A mesmerizing, wobbling 3D cube with dynamic deformation
- **Parallax Distortion Scrolling**: Text that flows with sinusoidal wave distortions
- **CRT Shader Effect**: Authentic retro monitor simulation with:
- Barrel distortion
- Scanlines
- RGB chromatic aberration
- Vignette effect
- **Animated Logo Background**: Smoothly moving tiled patterns
### Audio
- **YM Chiptune Playback**: Authentic Atari ST sound using the YM2149 emulation
- **Looped Music**: Classic demoscene soundtrack that brings back the nostalgia
### Technical Features
- **Cross-platform**: Runs on Windows, macOS, Linux, and Web browsers (via WebAssembly)
- **Optimized Performance**: Pre-allocated buffers and efficient rendering
- **60 FPS**: Smooth animations matching modern display standards
## 🚀 Live Demo
Experience the demo directly in your browser: [Coming Soon]
## 📋 Requirements
- Go 1.21 or higher
- For native builds: OpenGL support
- For web builds: Modern browser with WebAssembly support
## 🔧 Installation
### Quick Start
1. Clone the repository:
```bash
git clone https://github.com/olivierh59500/dma-is-back.git
cd dma-is-back
```
2. Install dependencies:
```bash
go mod download
```
3. Run the demo:
```bash
go run main.go
```
### Building from Source
#### Native Build
```bash
# Windows
GOOS=windows GOARCH=amd64 go build -o dma-demo.exe main.go
# macOS
GOOS=darwin GOARCH=amd64 go build -o dma-demo main.go
# Linux
GOOS=linux GOARCH=amd64 go build -o dma-demo main.go
```
#### WebAssembly Build
```bash
# Copy wasm_exec.js
cp "$(go env GOROOT)/misc/wasm/wasm_exec.js" .
# Build WASM binary
GOOS=js GOARCH=wasm go build -ldflags="-s -w" -o demo.wasm main.go
# Serve locally
python3 -m http.server 8080
# Open http://localhost:8080 in your browser
```
## 📁 Project Structure
```
dma-is-back/
├── main.go # Main application code
├── assets/ # Demo resources
│ ├── font.png # Bitmap font (Atari ST style)
│ ├── small-dma-jelly.png # Logo/background image
│ └── Mindbomb.ym # YM chiptune music
├── index.html # Web deployment HTML
├── wasm_exec.js # Go WASM support file
├── go.mod # Go module file
└── README.md # This file
```
## 🎨 Demo Sections
### 1. Intro Sequence
- Scrolling text with CRT shader effect
- Classic demoscene message: "IF YOU THINK THIS IS ALL, YOU'RE SO WRONG..."
### 2. Main Demo
- **Background**: Animated tiled logo with sinusoidal movement
- **Middle Layer**: Distorted scrolling text with multiple wave effects
- **Foreground**: 3D jelly cube with complex deformation animations
## 🛠️ Technical Details
### Graphics Engine
- **Ebiten v2**: Hardware-accelerated 2D game engine
- **Custom Shaders**: GLSL-style shaders compiled for Ebiten
- **Resolution**: 320x200 (classic Atari ST) upscaled to 768x540
### Audio System
- **YM Player**: Accurate YM2149 sound chip emulation
- **Format**: YM files (compressed Atari ST music format)
### Optimization Techniques
- Pre-allocated vertex and face buffers
- Reusable draw options to minimize GC pressure
- Efficient sorting algorithm for depth ordering
- Cached text rendering for scrolling effects
## 🙏 Credits
### Original Concept
- **The 24H Demo (TCB)**: Original Atari ST demo effects
- **Megadist Demo (ULM)**: Distortion scrolling inspiration
### Remake
- **Code**: [olivierh59500](https://github.com/olivierh59500/dma-is-back)
- **Framework**: [Hajime Hoshi](https://github.com/hajimehoshi) for Ebiten
- **YM Player**: [olivierh59500](https://github.com/olivierh59500/ym-player)
### Music
- YM chiptune from the Atari ST demoscene era (in the "Mindbomb" demo from TLB)
## 📄 License
This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.
## 🤝 Contributing
Contributions are welcome! Feel free to:
- Report bugs
- Suggest new features
- Submit pull requests
- Share your memories of the Atari ST era
## 🌟 Acknowledgments
Special thanks to the entire Atari ST demoscene community for pushing the boundaries of what was possible on 16-bit hardware. This remake is a tribute to your creativity and technical excellence.
---
**Remember: DMA is back!**
Made with ❤️ and lots of nostalgia