Texture filtering trilinear optimization on or off full#

Texture filtering trilinear optimization on or off full#

If it were the case that we were only performing full trilinear with coloured mipmaps then you might have a point, but this is emphatically not what we do. Like the Article in Descripe it as such one.ДЄ: Andy/Raja Absolutely not. Q: Is Ati cheating if Colored MipMaps are enabled and shows True FULL_TRI AF and Only Then. HereвЂ™s a key exchange, with ATI rep answering a participantвЂ™s question:

However, ATI then conducted an online chat to address this issue further. No mention is made of cases other than colored mip mapsВ—other вЂњatypicalвЂќ scenariosВ—where no such optimizations are used. So ATI admits that itвЂ™s using adaptive trilinear optimizations most of the time. Just to be explicit: there is no application detection going on this just illustrates the sophistication of the algorithm. This includes extreme cases such as colored mipmap levels, which is why tests based on color mipmap levels show different results. Atypical situations, where each mipmap could differ significantly from the previous level, receive no optimizations. It only applies this optimization to the typical case вЂ“ specifically, where the mipmaps are generated using box filtering. It works by determining how different one mipmap level is from the next and then applying the appropriate level of filtering. Our algorithm for image analysis-based texture filtering techniques is patent-pending. HereвЂ™s a key excerpt from ATIвЂ™s statement: Next, ATI issued a response explaining the algorithm. Colored mip maps serve little purpose other than to show reviewers and developers where and how filtering is happening, so detection of colored mip maps would seem to be a cheat. First, an article at Computerbase.be alleged ATI was doing less-than-full trilinear filtering, with the exception of cases where color mip maps were used.

Over the past few days, weвЂ™ve learned quite a bit about what ATI is actually doing with trilinear filtering. What weвЂ™ve learned about ATI texture filtering The shock comes because ATI has consistently touted its own texture filtering techniques as superior to the competitionвЂ™s, talking down the so-called вЂњbrilinearвЂќ filtering algorithm used by NVIDIA and encouraging use of tools for IQ analysis that donвЂ™t show the effects of ATIвЂ™s method. Indeed, the essence of graphics is creating an illusion as effectively as possible, and shortcuts are big part of that enterprise.

Such algorithms make sense, done properly, so they donвЂ™t harm image quality. The reason they came as a shock isnвЂ™t because weвЂ™ve now learned that ATI is using an adaptive algorithm to reduce its graphics workload. R ECENT REVELATIONS ABOUT the trilinear filtering techniques ATI has used in its more recent graphics chips, including the X800 series, have been something of a shock.