Linked by Thom Holwerda on Fri 6th Oct 2006 14:02 UTC, submitted by Michael Larabel
3D News, GL, DirectX "Open-source support has appeared by default in X.Org 7.1 for R300 generation GPUs. While ATI does not officially support these R300 open-source drivers, this alternative have been gaining momentum with users largely due to the lack of GLX_EXT_texture_from_pixmap support in fglrx. This extension is needed for the AIGLX desktop eye-candy. These drivers do lack TV-out support and many other features found within ATI's fglrx drivers, but how does its performance compare?"
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Reverse Engineered
by mikesum32 on Fri 6th Oct 2006 14:33 UTC
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from wikipedia:

While the R100 and R200-series chipset drivers were written using specifications provided by ATI (r200 driver), the R300-R500 hardware acceleration was written through reverse engineering (r300 driver) the methods used by ATI's proprietary driver. The reverse-engineered code is now in X.Org and Mesa, bringing experimental support for some of the current Radeon cards. All r3xx cards and all r4xx excluding the Xpress integrated chips should be supported by the new experimental r300 driver. With the 2.6.17 kernel, some cards from the r300 driver were added to the radeon driver

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