The syntax of GML borrows aspects from other languages such as C, C++ and JavaScript, giving it some syntax features of object-oriented programming but is not fully featured in that custom structures and classes are not possible. It is used to further enhance and control the design of a game through more conventional programming, as opposed to the drag and drop system. Game Maker Language (GML) is the primary scripting language that is interpreted similarly to Java's Just-In-Time compilation used in GameMaker, which is usually significantly slower than compiled languages such as C++ or Delphi. Versions 8.1 and lower had a variety of DLLs and wrappers to existing programming API's and libraries that extended GameMaker with things such as socket support and MySQL connectivity. The latest iteration of the software uses a new extension mechanism which is incompatible with extensions written for older versions of the program, especially those built on top of another single extension known as "GM API". It also supports the ability to create particle effects such as rain, snow and clouds, however not natively in 3D except through use of Dynamic Link Library. The program only supports the built in custom "d3d" mesh format which is not compatible with the DirectX mesh format and a converter is necessary to use more popular or standard 3D formats such as.
The program has no way of choosing which graphics API the runner uses for rendering on a given platform, always using Direct3D since 6.0 on Windows, and OpenGL since 7.0 on non-Windows based platforms. GameMaker primarily runs games that use 2D graphics, allowing the use of limited 3D graphics. It is also possible to create custom "action libraries" using the Library Maker. These icons represent actions that would occur in a game, such as movement, basic drawing, and simple control structures. GameMaker is designed to allow its users to easily develop video games without having to learn a complex programming language such as C++ or Java through its proprietary drag and drop system, in the hopes of users unfamiliar with traditional programming creating games by visually organizing icons on the screen. While Animo had a built-in scripting language, which was not as complex as it is in more recent versions, it and the next few versions of GameMaker did not have DirectX support, a separate runner to run games independently from the IDE, syntax highlighting, or the ability to compile games into executable files. The name was later changed to GameMaker, lacking a space to avoid IP conflicts with the 1991 software Game-Maker. Originally titled Animo the program was first released in 1999, and began as a program for creating 2D animations.
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