Jumpy

Jumpy is a cross-platform game engine and game project targeting both constrained hardware (Game Boy Advance, PSP) and modern PCs.

The core design goal is platform-agnostic game logic with platform-specific backends for rendering, audio, input, and threading. The same game code runs on PC and embedded targets, with differences handled behind feature-gated implementations.

PC is the primary development platform. Embedded targets are treated as first-class, but with stricter memory and API constraints.

supported platforms

• PC (Windows / Linux / macOS)
  • SDL2-based rendering, input, and audio
  • wav + ogg audio
  • threaded or single-threaded game loop
• Game Boy Advance
  • OAM / VRAM rendering
  • no standard library
  • strict memory limits
• PlayStation Portable (PSP)
  • rust-psp backend
  • feature-gated platform support

features

• Platform-agnostic game logic
• Feature-gated platform backends
  • pc
  • gba
  • psp
• Custom ECS
  • Lightweight and data-oriented
• Physics systems
  • Gravity and collision handling
• Deterministic math
  • Custom vector math
  • Optional PC-only integrations
• Audio system
  • Unified trait
  • Platform-specific implementations
• Asset pipeline
  • Shared logical assets
  • Platform-specific formats where required

project structure

High-level layout (simplified):

src/
├── main.rs
├── game/              # game logic (platform-agnostic)
│   ├── level/
│   ├── triggers/
│   ├── ecs/
│   └── render/        # renderer abstractions
├── physics/
├── platform/          # platform backends
│   ├── render/
│   │   ├── pc.rs
│   │   ├── gba.rs
│   │   └── psp.rs
│   ├── audio/
│   └── input/
├── assets/
└── common/