Flecs is a fast and lightweight Entity Component System that lets you build games and simulations with millions of entities (join the Discord!). Here are some of the framework's highlights:
- Fast and portable zero dependency C99 API
- Modern type-safe C++17 API that doesn't use STL containers
- First open source ECS with full support for Entity Relationships!
- Fast native support for hierarchies and prefabs
- Code base that builds in less than 5 seconds
- Runs in the browser without modifications with emscripten
- Cache friendly archetype/SoA storage that can process millions of entities every frame
- Automatic component registration that works out of the box across shared libraries/DLLs
- Write free functions with queries or run code automatically in systems
- Run games on multiple CPU cores with a fast lockless scheduler
- Verified on all major compilers and platforms with CI running more than 13000 tests
- Integrated reflection framework with JSON serializer and support for runtime components
- Unit annotations for components
- Powerful query language with support for joins and inheritance
- Statistics addon for profiling ECS performance
- A web-based UI for monitoring & controlling your apps:
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ECS is a way of organizing code and data that lets you build games that are larger, more complex and are easier to extend. Something is called an ECS when it:
- Has entities that uniquely identify objects in a game
- Has components which are datatypes that can be added to entities
- Has systems which are functions that run for all entities matching a component query
For more information, check the ECS FAQ!
C99 example:
typedef struct {
float x, y;
} Position, Velocity;
void Move(ecs_iter_t *it) {
Position *p = ecs_field(it, Position, 0);
Velocity *v = ecs_field(it, Velocity, 1);
for (int i = 0; i < it->count; i++) {
p[i].x += v[i].x;
p[i].y += v[i].y;
}
}
int main(int argc, char *argv