a quick and easy way to get a local Plan 9 terminal is to use 9Pi (Plan 9 on Raspberry Pi). with Go 1.6 and later you can cross compile for plan9/arm.

On Sat, May 28, 2016 at 10:24 AM Dave MacFarlane <driusan@gmail.com> wrote:

Either I'm going insane, the default Plan 9 /dev/draw in-memory implementation

doesn't implement draw(3), or possibly both.

When I do the following, it works as expected under both drawterm and a locally mounted instance:

1. Allocate a screen with an 'A' message

2. Allocate an image on the screen of the same size as /dev/wctl  with a 'b' message

3. Draw the image over the window with a 'd' message

4. Flush the buffer with 'v'

When I do the following, it works under drawterm, but not with a local /dev/draw implementation:

Steps 1-2 above

3. Allocate another image of some arbitrary fill colour with 'b' (with or without the repl bit)

4a. (Optional, doesn't seem to make a difference) set the compositing operator with 'O'

4b. Draw the new image over a portion of the window image from step 2 with 'd'

5. Go to step 3-4 from the first variation.

(I don't have a 9front instance to test on.)

On the other hand, replacing a portion of the image from step 2 with 'y' works under either. (I haven't gotten around to using 'Y' when appropriate yet.)

Basically, I can only get any variation of this code: https://github.com/driusan/exp/blob/18a78a1549541d46d26cb6088a904585c386d812/shiny/driver/devdrawdriver/uploadimpl.go#L50

to work under drawterm.

The end result is that under a local Plan 9 instance the basic sample shiny test looks like this:

http://driusan.github.io/plan9/basicmem.png

Instead of this:

http://driusan.github.io/plan9/basicdrawterm.png

Does anyone have any pointers? I don't have much access to a physical Plan 9 machine, so I'm having trouble debugging this since it works under drawterm (or perhaps is buggy under drawterm in a way that makes it seem like it's working..)

It would also potentially be helpful if someone who uses Go under 9front could let me know how x/exp/shiny/examples/basic looks with the shiny driver in that branch, but I'm not sure that it matters since it'll most likely be the same as one of the above..

- Dave