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December 2003 3Digest: Research Full Screen AntiAliasing (FSAA)



usehokpahh Antialiasing -- texhoo pbahha yyt quality bbomoo opaeh. Haha c oktpckoo bycka 2002 oa m pe heckoko pacpt ahh pae okaat he toko ckopocthe xapaktepctk, ho kaectbehhe, b tom bycke m pooaem ha cceobah, kotope ouseheh hobm kaptam.
Antialiasing, kak Anisotropy, baet pah :-). oee too, pahe pm pobote eat eo o pahomy. M he yem opoho pacckabat b tom paee o tohkoctx peaa pahx bob Antialiasinga, ho pbeem kak kpatkoe peme o kaomy bob.

to takoe, coctbehho, Antialiasing c em eo et? to otbett ha tot bopoc, hao opattc k ke k hbctke. C hbctko bc pocto. "Aht" ohaaet "potbo", "ach" hat "hehoct". useyaetc, to ahthehoct. Ho to useobha pab. Btopy useobhy pab m useym, oce opaeh k ke. Be opaehe ha mohtope coctot opeeehhoo koectba kcee o beptka opeeehhoo koectba kcee o opohta. Takm opaom, ctpoo beptkaha h ctpoo opohtaha h yet bet becma pobho, tak kak kce yyt pameatc ctpoo py o pyom b cyae beptkaho h ctpoo pom py c pyom b cyae opohtaho h. Ec e h yet pcobatc o kakm-o yom, to oha he yet bet pobho, a yet "pbaho", b cy too, to kce pacuseaatc b bymepho matpe, pamep kotopo cootbetctbyt papeeh kpaha. useyaetc tak habaema "ecehka". Kaaoc , ebxohoe useoehe! Be hebomoho meht ky mohtopob pobomx pahee poboxc ceac. Ho, kak obapba bcempho becth apoh, ebxohx useoeh he baet. Ha camom ee, ky meht he, ho moho omahyt aa cohahe useobate. mehho tm ahmaetc texhoo Antialiasinga. B ee aay bxot cabahe kpbx. A coco moyt t becma pah p ohom aoptme.
ockoky aaa octabeha octatoho etko aoptm ph paot tako. ockoky ky omeht he, ha omo pxot byah omah. Tak kak bet ohoo kce moet kopobatc 8- tam mhmym 32-m tam, kak makcmym (moho ha camom ee oe, ho ha ohom mohtope b bp cmoete bctabt, haExample , 64-x th bet, a y ybet eo aam pat toho he cmoete b cy k eobeeckoo aa), moho cobept omehy beta. och ha poctom Example e. Ect ba beta, haExample , e eph. Oa beta octatoho potbouseoh py pyy, to p haoeh h ohoo hx ha pyo a bha etka paha. To ect, ec ha eom ohe b hae matpe pobect ephy h, oha he yet acotho pobho, toko ec oha he opohtaha beptkaha. Oha useytc kak "pbaho". too, to oha bea mehee "pbaho" hao mecta papbob , o-pyomy, mecta cmeeh "amaat". "amabahe" cyt ect cmeehe betob. B haem cyae to cmeehe eoo ephoo. B peytate too cmeeh y hac useytc hob bet -- cep. Oh pobtc c byx ctopoh ot mecta cmeeh. B ohctbe cyaeb, cxoh bet h coxpahtc, ho b acthx cyax useyehh bet moet usehoct amectt cxoh bet h. Becma hemaobaeh ec tak e pamep cxoho matp. HaExample , ec matpa meet pamep oyphoo papeeh 800 ha 600, ho h yet octatoho cho "omaha", ohako, ec matpa ybetc b pamepe b ba paa, to ect ctahet 1600 ha 1200, to "om" bhehe yyt ye he tak ameth b cy mhma mect cmeeh a cet ybeeh pamepa matp, tak kak oha ta e kapthka oha omeatc b matpe 800 ha 600 1600 ha 1200. To ect, p oem pamepe matp ybebaetc ee paphoct cootbetctbehho pamep kce ymehaetc. B phe, cuseobat Antialiasing b papeeh 1600 ha 1200 to ckopee pxot, em heoxomoct b ot ot papeeh 800 ha 600. to ec obopt b eom o texhoo, ho to pocta act. Ha camom ee bc heckoko cohee.

to ee oe aytat tate ;-) m pbeem bepk ctate, btx c cata Mp HBA heckoko ousehehhx ham.
Cabahe ochobbaetc ha tom, to ka kce pabaetc ha heckoko cykcee. bet kaoo kce opeeetc ycpehehem o kakomy-o akohy betob bcex cykcee, kotope haxotc bhytp kce. p tom, xot eck papeehe octaetc pehm, ektbhoe papeehe hateho obaetc.
ba haoee acto pmehemx oxoa - to "Cyprocmh" "Mytcmh". Oa oh ochobah ha tom, to bet kaoo kce bcetc ytem cmebah betob cykcee (cmob). Ho cm b tx metoax eheppytc o-pahomy.
Cyprocmh - to cam pocto pmoheh meto cabah. Oh akaetc b tom, to opaehe pacctbaetc b bptyahom papeeh, b heckoko pa pebocxoem peahoe kpahhoe. oce eo oho mactapyetc tpyetc o tooboo papeeh. p tom bet kaoo kce peahoo papeeh bcetc ha ochobe heckokx cykcee bptyahoo. to oboet hateho obct quality opaeh, ho p tom hapyka ha yckopte bopactaet b heckoko pa ckopoct p tom, cootbetctbehho, aaet. Bbaho to tem, to bmecto ohoo beta kce, pxotc pacctbat b heckoko pa oe, haExample , p opmye Antialiasinga 2x2 b papeeh 800x600 yckopte petc octat papeehe 800x2 x 600x2, to ect 1600x1200.
Mytcmh - opao oee xtp hteektyah meto cabah. pabhee to habat ae he meto, a ckopee hctpymeht. e, o cyt, oeh pocta: aem pocto tak tyo bct N cykcee kaoo kce? Be, ye pacctahhe cykce, bo mhox cyax, moho cuseobat heckoko pa, opmpobah he ohoo, a heckokx peytpyx kcee. C pyo ctopoh, b hekotopx yactkax opaeh, cabahe he tpeyetc bobce, tak aem pacctbat x o heckokm cykcem? octatoho ohoo. , haoopot, b pyx yactkax hyho oeh xopoee quality cabah tam moho pacctat oeh mhoo cykcee. tot hctpymeht oboet he toko hateho ckohomt pecypc yckopte, ho useyt yee quality cabah! tot hctpymeht moet cuseobatc kak yoho , quality cabah ckopoct abct ot kohkpetho peaa, kotopy bpa papaotk yckopte Games.

Tepro m ohakomm bac c kohkpethm peaam Antialiasinga ot pobotee. Hahem c camoo heohoo camoo ophahoo o cboe cyt peeh ot komah Matrox.
Texhoo usehokpahhoo cabah, peaobahha b Parhelia-512 ha ceohh eh ahaoob he meet. ocemy, oha t oxbaeha, hecomhehho moet ctatc octatoho ko k eay. o cboe cyt, to cyprocmh, o 16 otcetob ha ohy toky kpaha. Ho, busehetc oh TOKO (!) toek phaeax kpam useohob (bceo 3..5% tho ceh). Ochobhoe pemyectbo oebho: b ote ot mytcmha tohe ahhe he xpahtc b amt he proecatc o he! Cymmaph pamep yepa kapa bopactaet hehateho, he oee em bboe, ae p makcmaho 16x yctahobke. opeeeh pahhx kcee cuseyetc ceah ctp poxo pehepha, koa yckopte b otehom yepe omeaet toko pahhe kce useohob, he bc haeh tekctyp he akpaba pomeytohx toek. Kpome too, t.k. opaatbatc toko kpa useohob, he bohkaet cboctbehho FSAA hekotopm phm MSAA texhkam otep etkoct tekctyp. Ohako, cto hteektyah meto AA cocoeh bbat apteakt b hekotopx cyax. Kpome too, oh he moet koppektho opaatbat cabahe pah proemeahx c useypopahm useoham (haExample oaka, tymah, cteka, ooh b pax).

po Antialiasing ot NVIDIA becma oxobo hacaho b ctatx ha cate MP HBA. M he bm cmca b tom, to pocto tyo proeeatat , t moet, ouseht t ctat, otomy, m pocto pbeem hk ha t ctat. aoba ctat haxotc ec. oee hoba ctat pacckaet bam o hobx octehx b texhoox Antialiasinga ot NVIDIA.

to e kacaetc Antialiasinga ot ATI to becma octyho hacaho ec. Tam e b ousehte cbo aa hah b oact Antialiasinga o pym kaptam toe.

Ha tom teoptecky act m akohm proeem k koectbehhm okaatem.

Tests m pobo ha haem tekyem ctehe (Pentium4 o ypabehem Windows XP). hctpymehtapem bctya Unreal 2: The Awakening Serious Sam: The Second Encounter.

Kpachm betom ha apammax beeh peytat paot kapt c bkehhm Antialiasingom.

Ho m oh hat a to m atm ckopoct paot. Kak bte, aeh b ckopoct octatoho bek m oh hat, ctot pa cbe. too abate ocmotpm ha ckphot, useyehhe ham b tx poehx ocmotpm peahoe quality, kotopoe m useyaem p aktba too hoo ba Antialiasinga.



Andrey Vorobiev (Anvakams@ixbt.com)
Kirill Budankov (budankov@ixbt.com)

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