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Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first

Raspberry Pi 4 - Forced VSYNC?!

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raspberrypi4sdl2vsync
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  • F
    FranceMSR @mitu
    last edited by 31 Mar 2021, 09:04

    @mitu sorry but you wrote "I remember being a SDL2 issue with its KMS video driver." as kind of sort of SDL-ONLY-RELATED internal driver, not Raspberry Pi one :-)

    As I said before, I'll try SDL 2.0.14 and I'll report the result

    M 1 Reply Last reply 31 Mar 2021, 09:10 Reply Quote 0
    • M
      mitu Global Moderator @FranceMSR
      last edited by 31 Mar 2021, 09:10

      @francemsr Yes, it's the SDL2 driver, not the Linux kernel or Mesa drivers.

      F 1 Reply Last reply 31 Mar 2021, 09:18 Reply Quote 0
      • F
        FranceMSR @mitu
        last edited by 31 Mar 2021, 09:18

        @mitu good, thanks.

        Just for testing purpose: is there a way to use glxgears closing EmulationStation?

        M 1 Reply Last reply 31 Mar 2021, 09:23 Reply Quote 0
        • M
          mitu Global Moderator @FranceMSR
          last edited by 31 Mar 2021, 09:23

          @francemsr You can install the desktop part as a Port and start it from EmulationStation - https://retropie.org.uk/docs/FAQ/#where-did-the-desktop-go

          F 1 Reply Last reply 31 Mar 2021, 09:25 Reply Quote 0
          • F
            FranceMSR @mitu
            last edited by 31 Mar 2021, 09:25

            @mitu ok, I thought there was a different way instead of pass from Desktop Environment.

            Thanks for now

            M 1 Reply Last reply 31 Mar 2021, 09:28 Reply Quote 0
            • M
              mitu Global Moderator @FranceMSR
              last edited by mitu 31 Mar 2021, 09:28

              @francemsr You can instruct the RetroPie launcher (runcommand) to start an emulator/program via xorg by adding XINIT to its command in emulators.cfg - for instance this is how steamlink is started (see here).

              F 1 Reply Last reply 31 Mar 2021, 09:37 Reply Quote 0
              • F
                FranceMSR @mitu
                last edited by 31 Mar 2021, 09:37

                @mitu oh good thing!

                F 1 Reply Last reply 31 Mar 2021, 10:16 Reply Quote 0
                • F
                  FranceMSR @FranceMSR
                  last edited by 31 Mar 2021, 10:16

                  Built SDL2 with --enable-video-kmsdrm parameter, this is the result of pre-build configuration

                  SDL2 Configure Summary:
                  Building Shared Libraries
                  Building Static Libraries
                  Enabled modules : atomic audio video render events joystick haptic sensor power filesystem threads timers file loadso cpuinfo assembly
                  Assembly Math   :
                  Audio drivers   : disk dummy oss alsa(dynamic) sndio(dynamic)
                  Video drivers   : dummy rpi x11(dynamic) kmsdrm(dynamic) opengl opengl_es1 opengl_es2 vulkan
                  X11 libraries   : xcursor xdbe xinerama xinput2 xinput2_multitouch xrandr xscrnsaver xshape xvidmode
                  Input drivers   : linuxev linuxkd
                  Enable virtual joystick APIs : YES
                  Using libsamplerate : YES
                  Using libudev       : YES
                  Using dbus          : YES
                  Using ime           : YES
                  Using ibus          : YES
                  Using fcitx         : YES
                  

                  When Raspberry Pi starts EmulationStation crashes on Creating window... log. Maybe I break something, any idea? This happens both with dtoverlay=vc4-fkms-v3d and dtoverlay=vc4-kms-v3d

                  P.S.: Building without --enable-video-kmsdrm option bring me to console with error related on creation of OpenGL window

                  M 1 Reply Last reply 31 Mar 2021, 10:25 Reply Quote 0
                  • M
                    mitu Global Moderator @FranceMSR
                    last edited by 31 Mar 2021, 10:25

                    Try to disable the rpi video driver when configuring SDL2.

                    F 1 Reply Last reply 31 Mar 2021, 13:10 Reply Quote 0
                    • F
                      FranceMSR @mitu
                      last edited by FranceMSR 31 Mar 2021, 13:10

                      @mitu Built SDL 2.0.14 with

                      --disable-video-rpi --enable-video-kmsdrm
                      

                      The FPS problem still exists with 5.4 kernel, or newer one after full SO upgrade (in this case with fkms or kms), and in this way when emulator is closed EmulationStation is frozen.

                      Anyway I found a solution, if VERTICAL SYNC is enabled also on emulator (I added a command line parameter for this) also Raspberry Pi v4 version is ok.

                      If you don't have any other idea I'll stop the investigation, I don't love VSYNC because if a user has a 50 Hz monitor all games with nominal 60 FPS framerate runs at 50 FPS.

                      Really appreciate your help

                      1 Reply Last reply Reply Quote 0
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