raysan5

CUSTOM GAME ENGINES: A Small Study

WARNING: Article moved to separate repo to allow users contributions: https://github.com/raysan5/custom_game_engines

A couple of weeks ago I played (and finished) A Plague Tale, a game by Asobo Studio. I was really captivated by the game, not only by the beautiful graphics but also by the story and the locations in the game. I decided to investigate a bit about the game tech and I was surprised to see it was developed with a custom engine by a relatively small studio. I know there are some companies using custom engines but it's very difficult to find a detailed market study with that kind of information curated and updated. So this article.

Nowadays lots of companies choose engines like [Unreal](https:

r-lyeh-archived

#include <map>  // Component-entity system in 16 lines of C++11. 2013 rlyeh, MIT licensed
#include <set>  // Code fragment from kult engine     -    https://github.com/r-lyeh/kult
enum {JOIN,MERGE,EXCLUDE};using set=std::set<unsigned>;template<typename T> set&system(){
static set entities;return entities;}template<typename T,int MODE>set subsystem(const set
&B){set newset;const set&A=system<T>();if(MODE==MERGE){newset=B;for(auto&id:A)newset.ins\
ert(id);}else if(MODE==EXCLUDE){newset=B;for(auto&id:A)newset.erase(id);}else if(A.size()
<B.size()){for(auto&id:A)if(B.find(id)!=B.end())newset.insert(id);}else{for(auto&id:B)if(
A.find(id)!=A.end())newset.insert(id);}return newset;}template<typename T>std::map<unsig\
ned,T>&components(){static std::map<unsigned,T>objects;return objects;}template<typename\
 T>bool has(unsigned id){return components<T>().find(id)!=components<T>().end();}templat\