glGetString — return a string describing the current GL connection
const GLubyte* glGetString( | GLenum name); |
name Specifies a symbolic constant, one of GL_VENDOR, GL_RENDERER, GL_VERSION, GL_SHADING_LANGUAGE_VERSION, or GL_EXTENSIONS.
glGetString returns a pointer to a static string describing some aspect of the current GL connection. name can be one of the following:
GL_VENDORReturns the company responsible for this GL implementation. This name does not change from release to release.
GL_RENDERERReturns 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.
GL_VERSION Returns a version or release number of the form OpenGL.
GL_SHADING_LANGUAGE_VERSION Returns a version or release number for the shading language of the form OpenGL.
GL_EXTENSIONSReturns 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. 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 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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