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https://github.com/jerboaburrow/hop

Lightweight, cross-platform, 2D game engine | ECS; Lua Console; Physics; Tile based
https://github.com/jerboaburrow/hop

android cpp entity-component-system linux lua macos opengl physics-2d tile-based windows

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Lightweight, cross-platform, 2D game engine | ECS; Lua Console; Physics; Tile based

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README 

        
# Hop



#### A lightweight 2D game engine, in C++ with embedded Lua



### Features



- Free, MIT open sourced..

- Use as a standalone engine or as a drop in component (e.g. with SFML)..

- Entity component system (ECS) based.

- Physics (Discrete element method):

  - [x] collision primitives (circles, rects).

  - [x] collision meshes built from primitives (rigid and soft).

  - [x] configurable friction, gravity, drag, and restitution.

  - [x] super-sampling.

  - [ ] (good) multithreading.

  - [x] Cell list collision detection.

  - [ ] Quad tree collision detection.

  - [x] Object-object and object-world collisions.

  - [ ] collision islands and other optimisations.

- Rendering (provided by jGL, Vulkan is a WIP):

  - [x] OpenGL.

  - [ ] Vulkan.

  - [x] sprites (atlasing, and animateable atlases).

  - [x] collision primitives (circles/rects).

  - [x] Freetype fonts.

  - [ ] shapes (it is in jGL).

  - [ ] lightmaps and shadows.

  - [x] msaa.

  - [ ] particle effects (it is in jGL).

  - [x] texture management.

  - [ ] (compressed) texture asset packs.

  - [ ] Engine UI (Dear ImGui).

- Window management:

  - [x] Single window creation.

  - [ ] Multi-window.

  - [x] Key and mouse events.

  - [x] Frame limiting.

  - [ ] Snapping and resizing.

  - [x] Screenspace bbs. 

- Worlds:

  - [x] Perlin (marching squares).

  - [x] Tile maps.

  - [x] object-world collisions.

  - [ ] editable.

  - [x] saveable.

  - [ ] tile textures.

- Lua console

  - [x] ECS bindings (object management).

  - [x] Compressed script asset archive support.

  - [ ] Live in game console 

- Cross platform:

  - [x] Linux.

  - [x] Windows.

  - [x] macOS.

  - [x] Android.

  - [ ] IOS (mostly held up by jGL rendering).

- Tooling

 - [x] mesh editor.

 - [x] Lua script packer.

 - [ ] World editor.

 - [ ] Texture packer.



### Documentation



Checkout the docs [here](https://jerboaburrow.github.io/Hop/), and also the jGL docs [here](https://jerboaburrow.github.io/jGL/)



### Setup



- clone, and init the submodules (you can use ```submodules.sh```)

- the ```build.sh``` can be used to build



### OSS Dependencies and Licenses



- Freetype is licensed under the The FreeType Project LICENSE

- GLEW is licensed under aModified BSD License, the Mesa 3-D License (MIT) and the Khronos License (MIT).

- GLFW is licensed under the zlib/libpng

- GLM is licensed under the MIT License (but also, no bunnies have been made unhappy)

- Lua is licensed under the MIT license

- Miniaudio is licensed under the MIT-0 license

- stduuid is licensed under the MIT license

- vorbis and ogg is licensed under a BSD license

- zlib is licensed under the zlib license



Thanks to all the OSS developers: David Turner, Robert Wilhelm, and Werner Lemberg (Freetype), Milan Ikits , Marcelo E. Magallon , and Lev Povalahev Brian Paul, The Khronos Group Inc (GLEW), Marcus Geelnard and Camilla Löwy (GLFW), G-Truc Creation (GLM), Lua.org, PUC-Rio (Lua), David Reid (Miniaudio), Marius Bancila https://github.com/mariusbancila/stduuid#MIT-1-ov-file (stduuid), Xiph.org Foundation (vorbis, ogg), and Jean-loup Gailly and Mark Adler (zlib).