'\" e '\"macro stdmacro .ds Vn Version 1.2 .ds Dt 24 September 1999 .ds Re Release 1.2.1 .ds Dp May 22 14:45 .ds Dm 5 May 22 14: .ds Xs 56397 5 .TH GLGETSTRING 3G .SH NAME .B "glGetString \- return a string describing the current GL connection .SH C SPECIFICATION const GLubyte * \f3glGetString\fP( GLenum \fIname\fP ) .nf .fi .SH PARAMETERS .TP \w'\f2name\fP\ \ 'u \f2name\fP Specifies a symbolic constant, one of \%\f3GL_VENDOR\fP, \%\f3GL_RENDERER\fP, \%\f3GL_VERSION\fP, or \%\f3GL_EXTENSIONS\fP. .SH DESCRIPTION \%\f3glGetString\fP returns a pointer to a static string describing some aspect of the current GL connection. \f2name\fP can be one of the following: .TP 20 \%\f3GL_VENDOR\fP Returns the company responsible for this GL implementation. This name does not change from release to release. .TP \%\f3GL_RENDERER\fP 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. .TP \%\f3GL_VERSION\fP Returns a version or release number. .TP \%\f3GL_EXTENSIONS\fP Returns a space-separated list of supported extensions to GL. .P 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 \%\f3GL_VENDOR\fP and \%\f3GL_RENDERER\fP together uniquely specify a platform. They do not change from release to release and should be used by platform-recognition algorithms. .P 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 \%\f3GL_EXTENSIONS\fP string is a space-separated list of supported GL extensions. (Extension names never contain a space character.) .P The \%\f3GL_VERSION\fP string begins with a version number. The version number uses one of these forms: .P \f2major_number.minor_number\fP .br \f2major_number.minor_number.release_number\fP .P 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. .P All strings are null-terminated. .SH NOTES If an error is generated, \%\f3glGetString\fP returns 0. .P The client and server may support different versions or extensions. \%\f3glGetString\fP always returns a compatible version number or list of extensions. The release number always describes the server. .SH ERRORS \%\f3GL_INVALID_ENUM\fP is generated if \f2name\fP is not an accepted value. .P \%\f3GL_INVALID_OPERATION\fP is generated if \%\f3glGetString\fP is executed between the execution of \%\f3glBegin\fP and the corresponding execution of \%\f3glEnd\fP.