glGetString: return a string describing the current GL connection.
C Specification |
glGetString returns a pointer to a static string describing some
aspect of the current GL connection. name can be one of the
- Specifies a symbolic constant, one of GL_VENDOR,
GL_RENDERER, GL_VERSION, or
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. Strings GL_VENDOR and GL_RENDERER
together uniquely specify a platform. They do not change from release to
release and should be used by platform-recognition algorithms.
- 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.
- Returns a space-separated list of supported extensions to GL.
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. The GL_EXTENSIONS string is a space-separated list of
supported GL extensions. (Extension names never contain a space character.)
The GL_VERSION string begins with a version number. The
version number uses one of these forms:
Vendor-specific information may follow the version number. Its format depends
on the implementation, but a space always separates the version number and the
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.
- GL_INVALID_ENUM is generated if name is
not an accepted value.
- GL_INVALID_OPERATION is generated if glGetString is executed between the
execution of glBegin and the
corresponding execution of glEnd.