glGetString — return a string describing the current GL connection
Specifies a symbolic constant, one of
glGetString returns a pointer to a static string
describing some aspect of the current GL connection.
name can be one of the following:
Returns the company responsible for this GL implementation. This name does not change from release to release.
Returns the name of the renderer. This name is typically specific to a particular configuration of a hardware platform. It does not change from release to release.
Returns a version or release number of the form
OpenGL<space>ES<space><version number><space><vendor-specific information>.
Returns a version or release number for the shading language of the form
OpenGL<space>ES<space>GLSL<space>ES<space><version number><space><vendor-specific information>.
Returns a space-separated list of supported extensions to GL.
Because the GL does not include queries for the performance
characteristics of an implementation, some applications are written to
recognize known platforms and modify their GL usage based on known
performance characteristics of these platforms.
GL_RENDERER together uniquely specify
a platform. They do not change from release to release and should be used
by platform-recognition algorithms.
Some applications want to make use of features that
are not part of the standard GL. These features
may be implemented as extensions to the standard GL.
GL_EXTENSIONS string is a space-separated
list of supported GL extensions.
(Extension names never contain a space character.)
All strings are null-terminated.
If an error is generated,
glGetString returns 0.
The client and server may support different versions or extensions.
glGetString always returns a compatible version number or list of extensions.
The release number always describes the server.
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