Force depth test against a specific depth value, instead of ...

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Learnmore Forcedepthtestagainstaspecificdepthvalue,insteadoffragment'sactualdepth AskQuestion Asked 2years,6monthsago Modified 2years,6monthsago Viewed 249times 1 IwanttodrawsomeprimitivesbehindeverythingthatwrotetothedepthbufferbyusingglDepthFunc(GL_EQUAL)andwritingtoeverypixelthathasadepthof1.0(thehighestanddefaultvalue) However,forthistoworkIhavetoignorethecalculatedZ-depthonmyprimitives,forcingthemtotestasifitwere1.0forallofthem. Whatwouldbetheeasiestwaytoforceallfragmentsinaspecificdrawtotestashavingaz-depthof1.0regardlessoftheactualz-depthcalculatedinthevertexshader? openglglslopengl-3depth-testing Share Improvethisquestion Follow editedNov6,2019at19:22 Rabbid76 176k2525goldbadges101101silverbadges145145bronzebadges askedNov6,2019at19:10 AnneQuinnAnneQuinn 11.6k77goldbadges5050silverbadges8989bronzebadges Addacomment  |  1Answer 1 Sortedby: Resettodefault Highestscore(default) Datemodified(newestfirst) Datecreated(oldestfirst) 2 Ifyouwantthatallfragmentshaveadepthof1.0,theyou'vetoensure,thatthezcomponentofthenormalizeddevicecoordinateis1.0. Thenormalizeddevicecoordinateiscalculatedbyaperspectivedivideformtheclipcoordinate(thinkaboutthatasgl_Position.xyz/gl_Position.w). Setgl_Position.zequalgl_Position.w,aftertheclipcoordinateisset,thatcausesthatgl_Position.z/gl_Position.wis1.0: gl_Position.z=gl_Position.w; Butnote,thedepthofafragmentcanalsobesetinthefragmentshader,byassigningavaluetogl_FragDepth: (OfcoursethispreventsthattheEarlyFragmentTestcantakeplace) gl_FragDepth=1.0; Share Improvethisanswer Follow answeredNov6,2019at19:19 Rabbid76Rabbid76 176k2525goldbadges101101silverbadges145145bronzebadges Addacomment  |  YourAnswer ThanksforcontributingananswertoStackOverflow!Pleasebesuretoanswerthequestion.Providedetailsandshareyourresearch!Butavoid…Askingforhelp,clarification,orrespondingtootheranswers.Makingstatementsbasedonopinion;backthemupwithreferencesorpersonalexperience.Tolearnmore,seeourtipsonwritinggreatanswers. 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