OpenGL versions - Raspberry Pi Forums

I have a relatively simple OpenGL application (oscilloscope display) that I'd like to run on the widest range of Pi hardware, with the smallest ... ForumFAQ About Aboutus Contactus Documentation Trademarkrules Login Register Unansweredtopics Activetopics ForumFAQ About Aboutus Contactus Documentation Trademarkrules Boardindex Programming Graphicsprogramming OpenGLES OpenGLversions Locked Printview 7posts •Page1of1 jayben Posts:443 Joined:MonAug19,20199:56pm OpenGLversions WedDec09,202010:49am IhavearelativelysimpleOpenGLapplication(oscilloscopedisplay)thatI'dliketorunonthewidestrangeofPihardware,withthesmallestcomplicationinstallinggraphicsdrivers. I'veinstalledfreeglut3-devandlibglew-devfromthelatestdistro. Pi3worksfine;glGetString(GL_VERSION)returns"3.1Mesa19.3.2".Noproblem;Icanlivewiththelimitationsof3.1,andtheshadercompilersdoaccept'#version140'intheGLSLcode. Pi4returns"2.1Mesa19.3.2",whichisanuisance,astherearesome3.1featuresI'dliketouse:GLSL'#version140'returnsanerror. PrefixingthePi4applicationwith'MESA_GL_VERSION_OVERRIDE=3.3'magicallyfixesthisproblem,asthecodereports"version3.3(CompatibilityProfile)Mesa19.3.2". Myquestionsare: 1.Theoverrideissupposedlyonlyfordebugging;willallthe3.1featuresreallybeavailable?Ifnot,howdoIdiscoverwhatismissing? 2.HowdoIinstalla'real'OpenGL3.1driveronthePi4? 3.ThePizerohasaVideocoreGPU,andOpenGLreturnsthe3.1versionstring,buteverythingrunsincrediblyslowly(maybewithsoftwareemulation?).IstheGPUusableforsimpleprograms? Thanksalot, Jayben Paeryn Posts:3470 Joined:WedNov23,20111:10am Location:Sheffield,England Re:OpenGLversions WedDec09,20207:48pm jaybenwrote:↑WedDec09,202010:49am IhavearelativelysimpleOpenGLapplication(oscilloscopedisplay)thatI'dliketorunonthewidestrangeofPihardware,withthesmallestcomplicationinstallinggraphicsdrivers. I'veinstalledfreeglut3-devandlibglew-devfromthelatestdistro. Pi3worksfine;glGetString(GL_VERSION)returns"3.1Mesa19.3.2".Noproblem;Icanlivewiththelimitationsof3.1,andtheshadercompilersdoaccept'#version140'intheGLSLcode. Pi4returns"2.1Mesa19.3.2",whichisanuisance,astherearesome3.1featuresI'dliketouse:GLSL'#version140'returnsanerror. PrefixingthePi4applicationwith'MESA_GL_VERSION_OVERRIDE=3.3'magicallyfixesthisproblem,asthecodereports"version3.3(CompatibilityProfile)Mesa19.3.2". Myquestionsare: 1.Theoverrideissupposedlyonlyfordebugging;willallthe3.1featuresreallybeavailable?Ifnot,howdoIdiscoverwhatismissing? 2.HowdoIinstalla'real'OpenGL3.1driveronthePi4? 3.ThePizerohasaVideocoreGPU,andOpenGLreturnsthe3.1versionstring,buteverythingrunsincrediblyslowly(maybewithsoftwareemulation?).IstheGPUusableforsimpleprograms? Thanksalot, Jayben AtaguessI'dsaythatontheRPi3youaregettinganOpenGLEScontextbutontheRPi4youaregettinganOpenGLcontext.NeithertheRPi3norRPi4willgiveyouanOpenGL3contextbecauseAFAIKneitherhasfullhardwaresupportforit,themaximumforOpenGLis2.1andforOpenGLESis3.2(thoughMesa19.3.2onlysupportsupto3.1). I'msurprisedtheRPi3advertises3.1,Ididn'tthinktheVC4wascapableofES3,onlyES2.0. Whatdoyoumeanbya'real'OpenGL3.1driver?TheMesadriversaretherealones,thereisanewerversion(20.3)butyou'llhavetocompileityourself,andasabove,theRPi4doesn'tsupportOpenGL3. Shewhotravelslight—forgotsomething. Pleasenotethatmynamedoesn'tstartwiththe@charactersocanpeoplepleasestopwritingitasifitdoes! jayben Posts:443 Joined:MonAug19,20199:56pm Re:OpenGLversions ThuDec10,202011:58am Thanksverymuchforthisreply;itlookslikethebestoptionistouseOpenGLESv3onallPiversions. I'veput"#version300es"atthetopoftheGLSLcode,andwithafewminormods,thecoderunsfineonall3platforms,albeitveryslowlyonthezero(4FPS,asopposedto92FPSonPi3,and124FPSonPi4). However,thePi4stillreports"OpenGLversion2.1Mesa19.3.2";soI'mwonderingiftheGLSL#versionstatementissufficienttoselectESmode,ordoIneedtoaddsomethingtothemainprogram,e.g.glutInitContextVersion? Andisthereanywayofspeedingupthezero? jayben Posts:443 Joined:MonAug19,20199:56pm Re:OpenGLversions WedDec16,202010:59am Incaseanyoneisinterested,IhavepostedtheOpenGLoscilloscopedisplayprojecthere: http://iosoft.blog/oscilloscope-display...pberry-pi/ BrianBeuken Posts:467 Joined:FriJan29,201612:51pm Re:OpenGLversions WedDec16,202011:40am Pi3'scan'tdoOpenGLES3.xitmaxesoutat2.0.Ithinkyoumisreadormistypedthat. Pi4candoOpenGLES3.1thoughnotevery3.1featureworksasadvertised.Butitsprettymuchstableon3.0 IfyouwanttorunonallsystemssticktoOpenGLES2.0. ThePi4and3differquiteabitinmethodstosetupanOpenGLEScontext.thePi3needstobesettolegacydrivers,otherwiseitwillattempttoruntheOpenGLsystemswhichemulatesomeaspectsofOpenGL2.x thePi4isalreadyinOpenGLES3.xmodeandyouneedtochoosetogotoOpenGLmode. ImprettysurprisedyougetaPi3tocompileshaderswith#version300esonit..IsuspectitsignoringitorthrowingwarningsyouarenotseeingasitdefaultsbacktoOpenGLviayourframework. IalwaysfinditeasiertomakesurethehardwareissetuptohandleOpenGLESandthensetupmyowncontextsdependingonthemachine. theZeroissloooow...itsjustafactoflifeI'mafriad,thoughifyoudialupitsOpenGLES2.0systemsanddon'toverloadtheCPUitcandookagainstitsbiggerbrothers,butithasalotoflimits Veryoldcomputergameprogrammer,nowteachingveryyoungcomputergameprogrammers,someverybadhabits. http://www.scratchpadgames.net/ https://www.patreon.com/BrianBeuken jayben Posts:443 Joined:MonAug19,20199:56pm Re:OpenGLversions WedDec16,20202:56pm Sorrytodisagree,but'#version300es'doesseemtoworkreallywellonaPi3modelBv1.2withthelatestBusterversion;over110framespersecondwhenmyapplicationisina640x480window,only25%slowerthanaPi4. Also,ifIforceanerrorbychangingthedefinitionto'#version400es',Igetthefollowingresponse: GLSLES4.00isnotsupported.Supportedversionsare:1.10,1.20,1.30,1.40,1.00ES,and3.00ES Isthereadocumentsomewhere,orsomeAPIcalls,thatcancategoricallystatewhatissupported? BrianBeuken Posts:467 Joined:FriJan29,201612:51pm Re:OpenGLversions ThuDec17,202010:23am Idont'doubtitsworking,buttheRpi3isanOpenGLES2.0system,soitdoesnotnaturuallysupportGLSL3,whichiswhyIamsurpriosed. SoIdothinkyouareusingthesuppliedonboardOpenGLsystemwhichisprettyamazing,butemulatessomeofthemoreadvancedOpenGLstuffthatOpenGLES2.0doesnothave.IfyouweretoruncodeasanativeOpenGLES2.0youwouldcertainlygetwarningsthatGLSL3isnotsupported.itonlysupports1.0. RenderingintheemulatedGL2or3.3isgoingtobeprettymuchokaslongasyou'renotusinganyspecificfeatures,likeinstancing,eventhenyoumightnotnoticeahituntilyoustarttoreallypushyourgraphicthroughput. IfthatOpenGLsystemisdoingallyouneedthenstickwithit.Ifyouneedmoreperformance,dropbacktothelegacydriverson3,andstandarddriverson4andyougetOpenGLES2.0onPi3andOpenGLES3.0/1onPi4 Veryoldcomputergameprogrammer,nowteachingveryyoungcomputergameprogrammers,someverybadhabits. http://www.scratchpadgames.net/ https://www.patreon.com/BrianBeuken Displaypostsfromprevious:Allposts1day7days2weeks1month3months6months1yearSortbyAuthorPosttimeSubjectAscendingDescending Locked Printview 7posts •Page1of1 Returnto“OpenGLES” Jumpto Community   Generaldiscussion   Announcements   Otherlanguages     Deutsch     Español     Français     Italiano     Nederlands     日本語     Polski     Português     Русский     Türkçe   Usergroupsandevents   TheMagPi UsingtheRaspberryPi   Beginners   Troubleshooting   Advancedusers   Assistivetechnologyandaccessibility Education   Picademy   Teachingandlearningresources   Staffroom,classroomandprojects     AstroPi     Mathematica     HighAltitudeBalloon     Weatherstation Programming   C/C++   Java   Python   Scratch   Otherprogramminglanguages     Windows10forIoT     WolframLanguage   Baremetal,Assemblylanguage   Graphicsprogramming     OpenGLES     OpenVG     OpenMAX   Generalprogrammingdiscussion Projects   Networkingandservers   Automation,sensingandrobotics   Graphics,soundandmultimedia   Otherprojects   Gaming     Mediacentres     AIYProjects Hardwareandperipherals   Cameraboard   ComputeModule   OfficialDisplay   HATsandotheradd-ons   DeviceTree   Interfacing(DSI,CSI,I2C,etc.)   RaspberryPi400   RaspberryPiPico     General     SDK     MicroPython     OtherRP2040boards Operatingsystemdistributions   RaspberryPiOS   RaspberryPiDesktopforPCandMac   Other     Android     Debian     FreeBSD     Gentoo     LinuxKernel     NetBSD     openSUSE     Plan9     Puppy     Arch     Pidora/Fedora     RISCOS     Ubuntu YeOldePiShoppe   Forsale   Wanted Offtopic   Offtopicdiscussion Boardindex AlltimesareUTC Deletecookies