OpenGL 2.1 Reference Pages

Use the index at the left to choose any GL, GLU, or GLX reference page for viewing. The reference pages (also known as "man pages") include all of the important usage information for each command. This information includes a description of all parameters, return values, error conditions, and related commands.

Browser Compatibility

Many of the reference pages depend on relatively complex math equations. We've chosen the industry standard, MathML, for rendering our equations. This standard is gaining widespread support, but there are still some growing pains. Here's what you can expect from different browsers:


If you find any inaccuracies or typos in the reference pages, don't hesitate to inform us via the feedback form.