ref: 8c6c4b3d23f9fe355023419e2d826bc852f4fb95
parent: 546ee154fde02e76583a36fd09bd92de93d8872f
author: Tanguy Fautre <tanguy@fautre.com>
date: Sun Feb 9 18:36:19 EST 2020
Moved from SDL1 to SDL2, use off-screen surface blitting. Re-enabled SDL mixer audio.