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gluPerspective Question

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I am writing an OpenGL wrapper, and am trying to not use the helper libraries such as GLU. I am wondering what the math behind this function call is, so I can code a custom version of it to eliminate the use of GLU. Thanks in advance.

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These three pages describe perspective projection in detail. The first two are a build up to the last one, which covers the creation of a perspective projection matrix.
Note that those pages don''t cover OpenGL so don''t expect to find the source code to gluPerspective there. It will help you to create it yourself though.

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Do look out though, these pages have the positive Z-axis pointing out of the screen while the OpenGL Z-axis points into the screen. Also, the matrices used in the pages would have to be loaded into OpenGL like this:

0 1 2 3
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