New versions of the OpenGL specification are regularly released by the Khronos Group, each of which extends the API to support various new features. This is perhaps the greatest difference between OpenGL and its competitor, DirectX. For the same reason, OpenGL is purely concerned with rendering - it provides no APIs related to input, audio or windowing. The specification says nothing on the subject of obtaining, and managing, an OpenGL context, leaving this as a detail of the underlying windowing system. As such, OpenGL has very many language bindings, some of the most noteworthy being the Javascript binding WebGL the C bindings WGL, GLX and CGL the C binding provided by iOS and the Java and C bindings provided by Android.Īs well as being language-independent, OpenGL is also platform-independent. Although the function definitions are superficially similar to those of the C programming language, they are language-independent. The API is defined as a number of functions which may be called by the client program, alongside a number of named integer constants (for example, the constant GL_TEXTURE_2D, which corresponds to the decimal number 3553). Although it's possible for the API to be implemented entirely in software, it's designed to be implemented mostly or entirely in hardware.
The OpenGL specification describes an abstract API for drawing 2D and 3D graphics. 5.9 Longs Peak and OpenGL 3.0 controversy.
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