Quake Engine source review

Interesting thought: the three most popular games on Steam[1] (Team Fortress 2, Counter-Strike, and Counter-Strike Source) <i>and</i> the two most popular games on Xbox Live[2] (Modern Warfare 2 and Black Ops) are all based on Quake's engine to some extent.<p>[1] <a href="http://store.steampowered.com/stats/" rel="nofollow">http://store.steampowered.com/stats/</a> [2] <a href="http://majornelson.com/2011/08/10/live-activity-for-week-of-august-1st/" rel="nofollow">http://majornelson.com/2011/08/10/live-activity-for-week-of-...</a>

Is it usual in games to perform prediction in single-player?<p>Also interesting note regarding readability of bitwise operations at the end of the Networking section.<p>Edit: Found more about this exact substitution on Wikipedia, of all places. :)<p><a href="http://en.wikipedia.org/wiki/Modulo_operation#Performance_issues" rel="nofollow">http://en.wikipedia.org/wiki/Modulo_operation#Performance_is...</a>

Very cool. More code reading posts, please! :)