I am working on the Raspberry Pi 4 Mesa V3D driver

The Raspberry Pi 4 sports a Video Core VI GPU that is capable of OpenGL ES 3.2, so it is a big update from the Raspberry Pi 3, which could only ... Skiptocontent Yeah…thisblogpostiswelloverdue,butbetterlatethannever!Soyes,IamcurrentlyworkingonprogressingtheRaspberryPi4Mesadriverstack,togetherwithmyIgaliancolleaguesPiñeiroandChema,continuingthefantasticworkstartedbyEricAnholtontheMesaV3Ddriver. TheRaspberryPi4sportsaVideoCoreVIGPUthatiscapableofOpenGLES3.2,soitisabigupdatefromtheRaspberryPi3,whichcouldonlydoOpenGLES2.0.AnotherbigchangewiththeRaspberryPi4isthattheMesav3ddriveristhedriverusedbydefaultwithRaspbian.BecausebothGPUsarequitedifferent,ErichadtowriteanallnewdriverfortheRaspberryPi4,andthatiswhytherearetwodriversinMesa:theVC4driverisfortheRaspberryPi3,whiletheV3DdrivertargetstheRaspberryPi4. Asforwhatwehavebeenworkingonexactly,IwrotealongpostontheRaspberryPiblogsomemonthsagowithalotofthedetails,butforthoselookingforthequicksummary: Shadercompileroptimizations. SignificantTransformFeedbackfixesandimprovements. ImplementedOpenGLLogicOperations. AbunchofbugfixesforPiglittestfailures. SetupaContinuousIntegrationsystemtoidentifyregressions. RebasedandmergeEric’sworkonComputeShaders. ManybugfixestargetingtheKhronosOpenGLESConformanceTestSuite(CTS). Sothat’sitforthelatenews.Ihopetodoabetterjobkeepingthisblogupdatedwiththenewsthisyear,andtostartwiththatIwillbewritingacoupleofadditionalpoststohighlightafewsignificantdevelopmentmilestonesweachievedrecently,sostaytunedformore! 7thoughtson“IamworkingontheRaspberryPi4MesaV3Ddriver” CanyougiveusaETA?Maybethisquarterorsecondofthisyear?Thanksfortheupdateonstatus! AllofthatworkisalreadyupstreaminMesa’s19.3release.UnfortunatelyIcan’tgiveyouanETAforwhenthatwouldarrivetoRaspberryPi4usersifthatiswhatyou’reaskingfor,thatdependsontheRaspberryPiFoundationpackagingandreleaseprocess,whichishandledbyadifferentgroupofpeople. HiIago, thanksforyourworkonthis!IamreallyexcitedforthefutureofthePi4🙂 DoIunderstandcorrectlythatforthebestperformanceonewouldwanttousecurrentmesamaster(or19.3.y)withv3d(notablyon_armv7l_)?Isthevc4kernelmoduleevenneededanymoreonthePi4ordoesitsolelydependonthenewv3d? Isthereanythingspecificthatdistromaintainersneedtokeepinmind? Bestregards, Tim HiTim, yes,19.3containssomeperformancework,butalsorelevantbugfixesandOpenGLES3.1whichbringsComputeShaders.Mastershouldbefinetoo,Ithinkmasterhasacoupleofrelevantperformanceimprovements(mostlyreplacingfnv1awithxxhashforourhashingwhichseemstosignificantlyimproveperformanceinsomecases)andalsobringsanewfeature:GeometryShaders. Thevc4kernelmodeisstillneeded,weneedbothvc4andv3d. Asforotherthingsthatmightberelevanttodistromaintainers,inordertogetGLES3.1withMesa19.3youalsoneedthiskernelpatch(whichisalreadymergedinthedownstreamrpi-4.19.ybranch): https://github.com/raspberrypi/linux/pull/3203 Aversionofthesamepatchwasalsopushedupstream(throughdrm-misc-next)quitesometimeago. HeyIago, thanksforyouranswer🙂 Ok!ThatclearssometroublesIhadunterstanding🙂 Currentlyiamusingthecurrentrpi-4.19.ybranchwithbothvc4andv3d(basicallydefconfig)andjustdoublechecked:it’sindeedworking,altoughonlyforasessionspawnedbyroot.Mynormaluserworksandshowstherightdriver(glxinfo-B:http://dpaste.com/3WRVYQK) buttheperformanceishorrible,withtextmorphingveryslowlyintoeachotherontheterminaletc🙂 Couldyouelaboratewhichdevicesin/devshouldneedtheirpermissionschanged?Itriedwith/dev/vchiqand/dev/dri/*withoutanyluck.Thanksalot! Yourusershouldatleastbeinthe‘video’group,Iamnotquitesureaboutwhatotherpermissionsitmayneed.IfbeinginthevideogroupisnotsufficientI’dsuggesttoaskthatsamequestionontheraspberrypiforums. https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=263587 Thanks,Ihavepostedthequestionthere.Hopefully,somebodycanshedsomelightonit.Haveagreatweekend! Commentsareclosed. 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