Test with Gokrazy

[hajimehoshi]

https://gokrazy.org/

I'm not sure how graphics driver should be implemented.

[hajimehoshi]

http://seenaburns.com/2018/04/04/writing-to-the-framebuffer/

/dev/fb0 is the way to go?

[db47h]

IIRC, The Pi has OpenGL ES 2.0 and can be used without even having to run under X Windows. The GL context is setup using straight EGL . See https://stackoverflow.com/questions/16080639/create-opengl-context-in-linux-consoleraspbian. The VideoCore sdk mentioned is installed by default in raspbian.

Also it seems to be working with GLFW (don't know about console mode though): https://github.com/libretro/ludo

[hajimehoshi]

Thank you for the information!

[db47h]

You're welcome ! After a bit of digging, looks like GLFW uses Xlib for input regardless of the context creation API. So supporting the Pi without running X11 will require an EGL wrapper + custom input handling 😢

[hajimehoshi]

For Pi, I thought we could use DispmanX (#760). I'm not sure this supports inputs though.

[db47h]

The examples have custom keyboard handling code. Short version: change terminal attributes and read stdin.

But... There's always the good old SDL2 which works on Pi without X. Added bonus: you can test the SDL2 driver on desktop!

[beoran]

Input handling from /dev/input/* devices is easy enough, I do it for joysticks already.