Origin Engine

A Source Engine-inspired game engine written in pure C with Vulkan rendering.

Features

• Vulkan renderer with textured brushes, wireframe overlay, transparency, and face lighting
• Arbitrary convex brush geometry with per-face textures, UV scale/offset
• Source-style entity system with classname/targetname, Think/Touch/Use callbacks
• Entity I/O system (output→input connections with delays)
• Brush entities: func_door, trigger_once, trigger_multiple, trigger_hurt
• Player movement: WASD + mouse, gravity, crouching, slope walking, fall damage
• ODE physics integration for rigid body props
• Binary map format (.oem) with brush, entity, I/O, and brush entity segments
• Game .so loading (dlopen) — engine and game are separate
• Dev console with command history
• Source-style menu system (title/pause)
• Sound system (miniaudio + stb_vorbis, WAV/OGG)
• Mesh system (.oemesh binary format) with prop rendering
• Equirectangular panorama skybox
• Bitmap font rendering with per-vertex color
• HUD (health, crosshair, death screen)
• Hammer-style 4-view map editor (GTK3 + Cairo)

Building

Requires: GCC, Vulkan SDK, GLFW3, ODE, GTK3

make engine    # builds origin_engine
make game      # builds game/bin/client.so
make editor    # builds origin_editor (GTK3)
make shaders   # compiles GLSL → SPIR-V

Running

./origin_engine --game game
./origin_editor --game game

Project Structure

engine/         Engine source (renderer, physics, entities, brushes, etc.)
game/           Demo game (client.so, maps, textures, sounds, meshes)
realGame/       Real game i'm working on
tools/          Map compiler, mesh generator, texture generator
editor.c        Hammer-style map editor
main.c          Engine entry point

Map Format (.oem)

Binary format with segments: MapData (0x00), Brush (0x01), Entity (0x02), I/O (0x03), BrushEntBrush (0x04). See map-example.txt for the full spec.

License [kinda]

Do whatever you want with it, as long as you credit Origin Engine. (This applies to the code in here and making games with it)