glGetString man page on DigitalUNIX

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glGetString(3G)						       glGetString(3G)

       glGetString - return a string describing the current GL connection

       const GLubyte * glGetString(
	       GLenum name );

       Specifies  a  symbolic constant, one of GL_VENDOR, GL_RENDERER, GL_VER‐

       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 ren‐
       derer. 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.

       Because	the GL does not include queries for the performance character‐
       istics 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.

       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 sup‐
       ported  GL  extensions.	(Extension names never contain a space charac‐

       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  depends
       on the implementation, but a space always separates the version	number
       and the vendor-specific information.

       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().


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