After criticizing rival Nvidia for using optimized trilinear filtering algorithms in its PC graphics card drivers--calling them ''unacceptable tricks'' in a recent presentation to hardware reviewers last month--ATI Technologies has acknowledged using similar optimizations itself after allegations raised by German Web site ComputerBase.de. ComputerBase.de staffers voiced concerns that ATI was possibly using application-specific cheats or optimized filtering algorithms after observing that the company's drivers rendered colored mip maps, such as those used in synthetic image-quality tests, with full trilinear filtering enabled, but the filtering method seemed to change under real game conditions in Unreal Tournament 2003.
In an online chat hosted by ATI to discuss the allegations, the company admitted that its graphics drivers do contain adaptive filtering optimizations but vehemently denied using application-specific cheats. Company representatives stated, ''Our target is also to avoid any need to detect applications, and as such we have to try to be sure that our image quality remains high in all cases. To achieve this we spent a lot of effort developing algorithms to make the best use of our quality tuning options. This isn’t a performance enhancement applied to popular gaming benchmarks.''
When asked about trilinear optimizations in light of ATI's recent disclosure, Nvidia's Brian Burke commented, ''In our view, if an optimization produces the correct image while speeding up performance, then it is beneficial to the end user and is legitimate. If a change in the driver does not produce the correct image, or functions only in the benchmark, it is either a bug and must be fixed, or a cheat.''
While ATI has been cleared of cheating charges in the technical arena, the company still has to overcome the damage caused by its failure to disclose the existence of the optimizations to the editors of major hardware publications. Tech Report's Wasson [L]http://www.techreport.com/etc/2004q2/filtering/index.x?pg=1[/L] has also reported on an ATI-issued Image Quality Guide where the company claims that ''gamers get full trilinear...all of the time'' with its newest Radeon X800 graphics card. While trilinear filtering can be broadly defined as any filtering technique used to eliminate the banding between mip map levels, it's commonly understood that ''full trilinear'' refers to classic, eight-sample trilinear filtering, but ATI has admitted that its graphics drivers only fall back to ''legacy trilinear filtering'' in situations where the texture content isn't applicable for its optimized filtering techniques.
Reviewers have asked for ATI to include the option to disable the feature since filtering optimizations require subjective image-quality tests to gauge overall effectiveness, while classical trilinear testing is still useful as a raw performance benchmark. Nvidia encountered similar demands when it first introduced its trilinear optimizations and responded by adding the option to disable the feature within the driver menu settings. ATI has stated that it is open to the possibility of adding the option to future driver revisions but has not yet confirmed if or when such an option would be implemented.
Röviden annyi, hogy mig a régen kiszivárgott ATi dokumentum ''elfogadhatatlan trükk''-nek nevezte az nVidia által használt szürést, addig az X800 is hasonlót csinál. Jelenleg az nVidia driverben kikapcsolható ez a funkció, addig az ATi driverben nem. Természetesen az nVidia is csak a lebukás után rakta bele :) Állandoan ez az aniso csalás. Az antialias többet elvesz a telejsitményböl. nem?
(A techreport szerint ha jol értelmeztem akkor még mindig jobb az x800 anisoja mint a gf6800 ultráé) :F
pH! szerkesztöinek: láttam még mindig nincs kinn a föoldalon az, hogy az ATi radeon 9800 pro változatból van 128bit-es verzió és ovakodni kell töle. puszta kiváncsiság miért nem kerül ki? :)
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