Flecs engine

A fast, portable, low footprint, opinionated (but hackable), flecs native game engine.

The project is still WIP and currently only works on MacOS.

Usage

Build & run the engine:

cmake -S . -B build
cmake --build build
./build/flecs_engine

Why should I use this?

You should probably not use this, unless:

• you want to quickly prototype ideas
• you want to build an engine but not start from 0
• you're OK with the limitations of the engine

Features

Geometry

• Primitive shapes:
  • Quad
  • Box
  • Triangle
  • TrianglePrism
  • RightTriangle
  • RightTrianglePrism
• Primitive meshes (parameterized mesh cache):
  • Cone
  • Cylinder
  • Sphere
  • IcoSphere
  • HemiSphere
  • NGon
• Meshes
• Instanced rendering

Assets

• glTF loader
• PNG loader
• DDS loader
• HDR / EXR loader (for HDRI)

Materials

• Metallic
• Roughness
• Cubemap based reflections
• Emissive
• Transmissive (rough/smooth objects)
• PBR textures
• Per-instance materials
• Shared materials

Lighting

• Directional light
• Point lights
• Spot lights
• Clustered light rendering
• Cascading shadow maps
• Image based lighting

Atmosphere

• Dynamic atmosphere
• Dynamic atmosphere IBL

Effects

• Bloom
• SSAO
• Height fog (flat color & from atmosphere)
• Screen space sun shafts
• Tony McMapFace tone mapping

Misc

• Input handling
• Camera controller
• Time of day system
• Movement systems
• Tracy profiling
• Image-based rendering regression testing
• MSAA
• CPU frustum culling
• Render to image

Dependencies

• cglm
• cgltf
• glfw
• stb_image
• tinyexr
• tracy

Assets used

• Kronos sample assets
• Niagra bistro
• Kenney

Screenshots