RPi 4 Support

[ofTheo]

Making a comment to track getting RPi 4 working in the core.

This thread on the forum has been really helpful: https://forum.openframeworks.cc/t/rpi-4-raspbian-buster-openframeworks/32856

And there is a PR here which I haven't tried out yet.
#6325

Notes from @arturoc on allowing for switching between EGL and GL.
#6412 (comment)

This thread suggests legacy EGL support is not possible via the old approach:
https://www.raspberrypi.org/forums/viewtopic.php?p=1486714&sid=dc1c24dee4649d114b7cf089347f1833#p1486714

Current Status:
I have RPi 4 building the core and running headless ( using the nightly builds ) with these changes ( https://forum.openframeworks.cc/t/rpi-4-raspbian-buster-openframeworks/32856/21 )

• 1
  Switch this line in install_dependencies.sh to:

apt-get install freeglut3-dev libasound2-dev libxmu-dev libxxf86vm-dev g++ libgl1-mesa-dev libglu1-mesa-dev libraw1394-dev libudev-dev libdrm-dev libglew-dev libopenal-dev libsndfile-dev libfreeimage-dev libcairo2-dev libfreetype6-dev libssl-dev libpulse-dev libusb-1.0-0-dev libgtk${GTK_VERSION}-dev libopencv-dev libegl1-mesa-dev libglvnd-dev libassimp-dev librtaudio-dev libboost-filesystem-dev libglfw3-dev  liburiparser-dev libcurl4-openssl-dev libpugixml-dev

• 2
  And add PROJECT_LDFLAGS += -latomic to this file.

Once I have a monitor/keyboard will start looking into the GL / EGL changes needed to get windowed apps running.

[sourya-sen]

This post for relating to making changes to the Rpi3/Stretch to run using the GL driver/windowed apps from @bakercp might be useful here.

https://forum.openframeworks.cc/t/compiling-of-in-raspbian-stretch/27562/15

[arturoc]

If you got it to work with the legacy driver, i think that could be enough for now. that's what most people would want to use i think, not a full x windows session

would be good to test it on the old rpi but i think if it compiles on the ci servers then it should be ok

[ofTheo]

Thanks @sourya-sen

So far I can build and run with the legacy approach with those small changes and the ones @bakercp details, but no window appears on Rpi 4.

The app gets mouse events and there isn't anything unusual in the debug so I think its something with buster configuration or the libs it's using.

Would be ideal to get legacy working on both, before looking at the GL / GLFW method.

[ofTheo]

Nothing I have tried works so far.

• Both using GLFW and the legacy approach.
• Rpi4 #6325 doesn't work for me.

Next I am going to try this:
nondescriptpointer@36fd56f

Which uses X11 combined with the ofAppEGLWindow.
🤞

[ofTheo]

Okay got it working with @ThomasColliers 's commit.
I have a version which I'll push that has a single define for going between his changes and the current setup.

@ThomasColliers did you ever get it working with GLFW or just ofAppEGLWindow + X11?
If you didn't get the GLFW window working I'll leave out those changes - I haven't had any luck there so far.

[nondescriptpointer]

@ThomasColliers did you ever get it working with GLFW or just ofAppEGLWindow + X11?
If you didn't get the GLFW window working I'll leave out those changes - I haven't had any luck there so far.

Ah.. I actually thought I was running GLFW but that doesn't seem to be the case:
https://pasteboard.co/IwAuGMN.png
So no, I did not get GLFW working either.

[ofTheo]

@ThomasColliers I did get GLFW working with some tweaks to your changes ( mainly just not changing ofConstants.h )

See this PR: #6438
Uncomment this line for GLFW
https://github.com/openframeworks/openFrameworks/pull/6438/files#diff-011c6dc421d3f054ec0e4dd9d10683d5R56

Thanks again for your help with this!

[eshkrab]

Yay!! Sorry, I've been on another project and didn't respond to your question. thank you so much for getting it to work!