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1、52TheDirect3D10Pipeline(ChasBoyd):AtourthroughtheDirect3D10renderingpipelinewithadetailedreviewoftheAPIsrelatedtoeachstage.ComparisonswithexistinggraphicsAPIsarecalledouttohelpbringtheaudienceuptospeedwiththenewdesign.[60minutes]53Onceyouunderstandhowthepipelineworks,imaginethatthereare
2、manyiterationsofeachstagerunninginparallelandyouunderstandwhywe’vesegmentedthewaywehave.Inordertoallowthegraphicstobeatthebestperformanceavailable54NowI’llquicklywalkthroughthepipelinestages55Nowacoupleofnotesabouttheoverallpipeline,[click]Firstalloftheprogrammablestagesusethesamebasevi
3、rtualmachinewiththesamecapabilities,instructionset,andresourcelimitsNext,thememorymodeismuchmoreflexible.[click]Memoryobjectsincludevertexbuffers,indexbuffers,textures,etcandtheycanbewrittentoinonerenderingpassandthenattachedtootherstagesofthepipelineforanotherrenderingpass.Thisisagener
4、alizationofrender-to-texture,render-to-vertexbuffer,etc.Finally[click],wealsosupportanarrayformofthememoryobjects,forexampleahomogeneousarrayof2Dtexturemaps.Whenthesearraysareusedonthepipeline,thearrayindexescanbegeneratedbytheprogrammablestages,forexampleusingtheIDsgeneratedbytheinputa
5、ssembler.56InasimilarveinwealsorestructuredtheAPItoimproveefficiency.OnechangewemadewastogrouprelatedstateintolargerobjectssothatmorerealworkisdoneineachAPIcall.Statethatisrelatedandlikelytochangetogetherisgroupedtogether.Thisgroupingisalsointendedtoguidehardwareimplementationstooptimiz
6、ethesetypesofstateupdates.Thisproducesaslightlymoreobject-basedAPImodel.57Theendresultisthatconfiguringtheentirepipelineuses18APIcallscomparedtomorethan100inDirect3D9.We’vealsopushedasmuchvalidationintothecreationofresources,insteadofatruntime,ordrawtime,tominimizethesoftwareoverheadWhe
7、nconfiguringthepipeline.5859Atthetop,thefixed-functioninputassemblerreadsverticesandconvertsthemtoacanonicalfloatingpointrepresentationItalsogeneratesauniqueidorindexforeachvertex,primitive,andobjectinstancethatcanbeusedinotherpartsofthepipeline60InputElementDescriptordescribes
