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I'm working on a c++/SFML paint program for my chromebook Acer R11 (running gallium linux) and would like to add multi-touch support. However I am stuck trying to find some way to get the input values into my c++ program.

The touchscreen works, full multi-touch works in chrome, non-touch applications treat it like a mouse.

SFML's sf::Touch methods don't give me anything, it appears they only work on android and ios.

I tried to get tslib to work, but it has zero setup instructions and I can't get the sample programs to compile and run.

I tried the c++ code in this thread How to get Coordinates of Touchscreen Rawdata using Linux but it stops at "You are not root! This may not work...\n", chrome gets touch events and its not root, so that's probably not the right direction.

I haven't had any success finding info about this online. What is the proper way to get touch events on a linux system?

More data: The touchscreen shows up in evtest under /dev/input/event6: Elan Touchscreen When I tell evtest to give me output it dumps realtime output correctly. 

cat /proc/bus/input/devices shows it as 
I: Bus=0018 Vendor=04f3 Product=002a Version=0000
N: Name="Elan Touchscreen"
P: Phys=
s: Sysfs=/devices/platform/80622C1:00/i2c-0/i2c-ELAN0001:00/input/input6
U: Uniq=
H: Handlers=mouse1 event6
B:PROP=2
B: EV=v
B: EKY=400 0 0 0 0 0
B: ABS=661800001000003
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1 Answers1

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Well, when evtest really dumps everything correctly, you won't need tslib. In case you might need it anyways, there is more documentation now and I'd be happy to help you use it, when you create a Github issue there.

It seems more like a problem with correctly reading your system's input in your application though :)

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