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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:

A half-hour to learn Zig

This is inspired by https://fasterthanli.me/blog/2020/a-half-hour-to-learn-rust/

Basics

the command zig run my_code.zig will compile and immediately run your Zig program. Each of these cells contains a zig program that you can try to run (some of them contain compile-time errors that you can comment out to play with)

	import * as React from "react"
	import { useState, useEffect } from "react"

	// Hook
	let cachedScripts = []

	export function useScript(src) {
	// Keeping track of script loaded and error state
	const [state, setState] = useState({
	loaded: false,

	1. Put app.ico in directory.

	2. Create app.rc in same directory with one line:
	IDI_ICON1 ICON DISCARDABLE "app.ico"

	3. Run command (Warning: it's app.o, not app.res, how it is mentioned in other manuals!)
	windres app.rc -o app.o

	4. add_executable(app
	...

	// Windows
	// g++ *.cpp -o vulkan -lSDL2main -lSDL2 -lvulkan-1
	// Linux
	// g++ *.cpp -o vulkan -lSDL2main -lSDL2 -lvulkan
	// https://vulkan-tutorial.com/

	#include <iostream>
	using namespace std;

	#include <SDL2/SDL.h>

	import useFetch from "useFetch";

	const { response, isLoading } = useFetch({
	api: identityApi,
	url: AUTH_MEMBER_TRANSACTIONS(requestOptions),
	config: JSON.stringify({ requireAuthentication: true }),
	});


	<html>
	<head>
	<meta charset="utf-8">
	<title>Collision JS 3D Physics</title>
	<style>
	body { margin: 0; }
	</style>
	</head>
	<body>

	<!DOCTYPE html>
	<html>
	<head>
	<style>
	.editor { font-family: 'Roboto Mono', monospace; font-size: 12px; outline: none; overflow-y: auto; padding-left: 48px; counter-reset: line; }
	.editor div { display: block; position: relative; white-space: pre-wrap; }
	.editor div::before { content: counter(line); counter-increment: line; position: absolute; right: calc(100% + 16px); opacity: 0.5; }
	</style>
	</head>

	#
	# CMake build system for Dear ImGui
	# =================================
	#
	# Build instructions:
	# 1. Install latest CMake
	# * Windows: https://cmake.org/download/ (Tick checkbox to place cmake in system PATH)
	# * Linux: from your favorite package manager
	# * MacOS: brew install cmake
	# 2. Open command prompt in directory containing "imgui" and "imgui_dev" folders

	const ram = require('random-access-memory')
	const hypercore = require('hypercore')
	const HyperBee = require('hyperbee')
	const HyperBeeDown = require('hyperbeedown')
	const PouchDB = require('pouchdb')

	start()

	async function start () {
	const core = hypercore(ram)