What EXACTLY Is An API? - GameCreators Forum

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Dark Java Dude 64

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Posted: 4th Aug 2011 02:16 Edited at: 4th Aug 2011 02:17

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So i know this probably sounds like a stupid question, but API's are defined so incredibly broadly that it's rather hard to figure out exactly what they do. For example, i know Direct 3D is an API. If i were to make a 3D object in a program, would D3D tell the program how to communicate with the program that communicates with the graphics card, or would it be an interface directly to the card? Im guessing the first, and im also guessing that that program would be the device management part of the OS? Answers appreciated! Thanks!

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BlackFox

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Posted: 4th Aug 2011 02:32

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Definition:

"API stands for "Application Program Interface," though it is sometimes referred to as an "Application Programming Interface."

An API is a set of commands, functions, and protocols which programmers can use when building software for a specific operating system. The API allows programmers to use predefined functions to interact with the operating system, instead of writing them from scratch."

All computer operating systems, such as Windows, Unix, and the Mac OS, provide an application program interface for programmers. APIs are also used by video game consoles and other hardware devices that can run software programs. While the API makes the programmer's job easier, it also benefits the end user, since it ensures all programs using the same API will have a similar user interface.

- BlackFox

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Neuro Fuzzy

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Posted: 4th Aug 2011 02:34

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I consider an API to be any set of include files and library files (or just source files). More broadly... it's any group of functions that interface with your program.

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Dark Java Dude 64

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Posted: 4th Aug 2011 02:40

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I see... But when i make a 3D object, is my program communicating with another program or the graphics card directly? But yes, those are good ways to think of API's! Thanks!

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Kevin Picone

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Posted: 4th Aug 2011 02:53

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Everything sits behind abstractions layers.. So your program communicates with the device through a common interface, be it D3D/ GL whatever floats your boat.

So Program -> Interface (D3D/Gl) -> Driver -> Hardware