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# 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:

- Firefox 1.5+: native support is built-in! Firefox 3.0 will offer the best rendering quality of all currently available browsers if you install the STIX fonts. Older versions of Firefox may outright complain about missing fonts without some mild interventions. See this page for tips on maximizing your MathML rendering experience on Firefox.
- Internet Explorer 6: no native support, but you'll be automatically prompted to install the Design Science MathPlayer plugin which renders our equations beautifully.
- Internet Explorer 7+: works out of the box with CSS-based MathML support, but the rendering is sub-optimal. We highly recommend installing the Design Science MathPlayer plugin.
- Opera 9.5+: native support is limping along, but don't rely on it rendering correctly yet.
- Safari and Chrome: no native support and no known add-ons. Sorry!

## Downloading Man Page Sources

The Docbook XML source for the man pages is available for anonymous checkout in Khronos' Subversion server, and you can build a man page distribution of your own using open source tools. See the OpenGL.org technical Wiki pages describing the XML Toolchain and Man Pages for more information.

## Feedback

If you find any inaccuracies or typos in the reference pages, don't hesitate to inform us via the feedback form or using the Khronos Bugzilla (you must first create a Bugzilla account, however).

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