Carmack's Reverse In Doom 3 Has Work-Around
Written by Michael Larabel in Gaming on 18 November 2011 at 06:40 AM EST. 15 Comments
Gaming
It looks like the patent issue with the open-source Doom 3 game won't severely delay the push of this code to the public. John Carmack has already worked around the legal issue within the id Tech 4 engine.

It was only three days ago that this patent issue came to light and was delaying the push of this open-source code, but yesterday Carmack announced he had a workaround in place for the legal issue surrounding Carmack's Reverse / the stencil buffer implementation of shadow volumes patented by Creative Labs.

The kicker? The workaround for this patent amounts to four lines of new code and two lines of changed code.

Yesterday Carmack had tweeted, "this demonstrates the idiocy of the patent -- the workaround added four lines of code and changed two."

Hopefully this workaround won't severely hamper the performance or reduce the image quality even more than what it's at now in the Mesa/Gallium3D drivers. See yesterday's benchmarks of Doom 3 on Mesa/Gallium3D to see how the game is performing and looking when using the open-source Intel, AMD/ATI, and NVIDIA Linux graphics drivers.

Should there not be any further issues with the Doom 3 / id Tech 4 code, hopefully it will be pushed soon.
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Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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