There is a PR open with Plan 9 devdraw support to 9fans.net/go/draw:
https://github.com/9fans/go/pull/28
It at least works with the Go acme port Edwood last I tested.

On Sat, Apr 4, 2020 at 4:33 PM Jeremy Jackins <jeremyjackins@gmail.com>
wrote:

> Well, you need a Go draw package in place of the C library. There is a
> draw package in github.com/9fans/go/ but unfortunately I think it only
> supports plan9port devdraw, rather than the native Plan 9 draw device.
> So there is some library work to be done first. Since the Go standard
> library also contains the most important drawing primitives
> implemented by the Plan 9 draw device (with the exception of font
> rendering, but there is golang.org/x/image/font), you may be able to
> ignore a lot of functionality provided by the Plan 9 draw library and
> focus on a few things like loading pixel data directly to the draw
> device.
>
> See: http://man.cat-v.org/plan_9/3/draw
>
> Jeremy
>
> On Sat, 4 Apr 2020 at 06:55, Kim Lassila <kim.lassila@gmail.com> wrote:
> >
> > Has anyone written a graphical application in Go on Plan 9? How would
> the Go equivalent of black.c (thank you fgb) look like?
> >
> > - - - clip - - -
> >
> > #include <u.h>
> > #include <libc.h>
> > #include <draw.h>
> >
> > void
> > main(int, char *argv[])
> > {
> > Rectangle rect;
> > Image *black;
> >
> > fmtinstall('R', Rfmt);
> > if(initdraw(nil, nil, argv[0]) < 0)
> > sysfatal("initdraw: %r");
> > rect = screen->r;
> > black = display->black;
> > draw(screen, rect, black, nil, ZP);
> > flushimage(display, 1);
> > sleep(5 * 1000);
> > closedisplay(display);
> > print("rectangle was %R\n", rect);
> > exits(nil);
> > }
> >
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