What is SDL and SDL2?

SDL is the abbreviation of Simple DirectMedia Layer.

Originally when refering to SDL, SDL 1.2 was meant. It is the predecessor of modern SDL 2.0 (sometimes SDL2). Nowadays, when refering to SDL, it depends on context if you really mean the old SDL 1.2 or the modern SDL 2.0.

The  obsolete SDL 1.2 and the modern SDL 2.0 are a set of units which provide a free, easy and platform-independent access to features needed for developing high performance games and applications. This includes easy access to graphic, sound and input handling (keyboard, mouse, joystick) for Free Pascal and other Pascal dialects.

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