DOOM 3 Source Patent Issue

The Doomworld Forums have an interesting follow-up to the fact that DOOM 3 made use of a "zfail" method of rendering shadows that is patented by Creative Labs (thanks Ant). Recalling this, they asked id's John Carmack how this might impact plans to release the DOOM 3 source code under the GPL at a future date. Sure enough, this situation could potentially result in patent infringement:
When we release the code (no date set), anyone that uses it would potentially be infringing. There are workarounds at a modest performance cost.
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Re: DOOM 3 Source Patent Issue
Apr 8, 2009, 11:56
Exe
25.
Re: DOOM 3 Source Patent Issue Apr 8, 2009, 11:56
Apr 8, 2009, 11:56
Exe
 
At the time Creative registered this patent, they were in the graphics card business.
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