glGetString.3G man page

glGetString — return a string describing the current GL connection

C Specification

const GLubyte* glGetString(GLenum name);

const GLubyte* glGetStringi(GLenum name, GLuint index);



Specifies a symbolic constant, one of GL_VENDOR, GL_RENDERER, GL_VERSION, or GL_SHADING_LANGUAGE_VERSION. Additionally, glGetStringi accepts the GL_EXTENSIONS token.


For glGetStringi, specifies the index of the string to return.


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 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 version or release number for the shading language.

glGetStringi returns a pointer to a static string indexed by index. name can be one of the following:


For glGetStringi only, returns the extension string supported by the implementation at index.

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.


GL_INVALID_ENUM is generated if name is not an accepted value.

GL_INVALID_VALUE is generated by glGetStringi if index is outside the valid range for indexed state name.