glGetString returns a pointer to a static string describing some aspect of the current GL connection. name can be one of the following: glGetStringi returns a pointer to a static string indexed by index. name can be one of the following: 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. The GL_VERSION and GL_SHADING_LANGUAGE_VERSION strings begin 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 vendor-specific information. All strings are null-terminated.
If an error is generated, glGetString returns 0. The client and server may support different versions. glGetString always returns a compatible version number. The release number always describes the server.
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glGetString: man3/glGetString.xml
glGetString returns a pointer to a static string describing some aspect of the current GL connection. name can be one of the following: glGetStringi returns a pointer to a static string indexed by index. name can be one of the following: 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. The GL_VERSION and GL_SHADING_LANGUAGE_VERSION strings begin 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 vendor-specific information. All strings are null-terminated.
If an error is generated, glGetString returns 0. The client and server may support different versions. glGetString always returns a compatible version number. The release number always describes the server.