Hey, Thanks for the help. I have been doing a bit of digging up through the code as well as the usage docs for XI2.1 and i have sorted out most of my issues.
Issue 1 : All valuators not reported : As u mentioned this is an optimisation which i was not aware of. Thanks for pointing that out. Issue 2 : TouchEnd event not received : Actually the last event that was received in the xinput app was the TouchMotion event with the XITouchPendingFinish flag set. When i looked through the Xserver code, i realised that this was a delibrate change to convey to the app that some client had grabbed the touches. Turns out that xinput application itself is doing a XIGrabTouchBegin for the main window. I removed that and then the TouchEnd events are received as expected. Sorry, my bad. Issue 3 : XServer crashes randomly : This is still an issue. But not something that will be a major roadblock for me. So i ll just wait till it gets fixed. Cheers, On Wed, Feb 2, 2011 at 8:31 PM, Chase Douglas <chase.doug...@canonical.com>wrote: > On 02/02/2011 04:10 AM, Rhishikesh wrote: > > Hi everyone, > > Let me start off by congratulating all the guys who have been working on > > the multitouch stack in the Xserver. amazing work ! > > I recently got my hands on a multitouch capable touchdevice which sends > > out events with the type A MT protocol. I have since begun to try and > > get multitouch working on it with the help of the mtdev->evdev->X stack. > > But i have faced a couple of major issues which i was hoping someone on > > the list could help me out with. > > > > Issue 1 : the event logs from the xinput test app seem a little strange > > EVENT type 21 (TouchMotion) > > device: 2 (6) > > detail: 9 > > flags: > > root: 54.27/57.28 > > event: 54.27/57.28 > > buttons: > > modifiers: locked 0 latched 0 base 0 effective: 0 > > group: locked 0 latched 0 base 0 effective: 0 > > valuators: > > 0: 60.00 > > windows: root 0x43 event 0x200001 child 0x200002 > > EVENT type 21 (TouchMotion) > > device: 2 (6) > > detail: 9 > > flags: > > root: 54.27/58.34 > > event: 54.27/58.34 > > buttons: > > modifiers: locked 0 latched 0 base 0 effective: 0 > > group: locked 0 latched 0 base 0 effective: 0 > > valuators: > > 3: 65.00 > > windows: root 0x43 event 0x200001 child 0x200002 > > EVENT type 21 (TouchMotion) > > device: 2 (6) > > detail: 9 > > flags: > > root: 55.37/59.40 > > event: 55.37/59.40 > > buttons: > > modifiers: locked 0 latched 0 base 0 effective: 0 > > group: locked 0 latched 0 base 0 effective: 0 > > valuators: > > 2: 120.00 > > 3: 66.00 > > windows: root 0x43 event 0x200001 child 0x200002 > > As we can see from the logs, some events have only one valuator while > > others have more than that. The expected number of valuators would be > > the number of valuators sent by the device which is 4. Please correct me > > if i am wrong here. > > This is a new feature as of the xserver 1.10. I added support for > "masked valuators". Essentially, if a valuator's value doesn't change > between two events, then the valuator isn't reported. This will have > event bandwidth savings when we begin using displays with tens or > hundreds (!) of touches simultaneously. > > > Issue 2 : We do not get the TouchEnd event after we lift the finger > > from the screen. > > EVENT type 21 (TouchMotion) > > device: 2 (6) > > detail: 9 > > flags: > > root: 56.47/61.52 > > event: 56.47/61.52 > > buttons: > > modifiers: locked 0 latched 0 base 0 effective: 0 > > group: locked 0 latched 0 base 0 effective: 0 > > valuators: > > 2: 122.00 > > 3: 68.00 > > windows: root 0x43 event 0x200001 child 0x200002 > > This is the log for the last event that xinput gets from the server. > > You should always get a TouchEnd event. This is a bug. However, this > area is still in flux in the protocol and in the implementation. Hold > tight! > > > Issue 3 : XServer crashes randomly on touch input. > > [dix] EventToXI2: Not implemented for 0 > > > > Fatal server error: > > [Xi] Mouse: XI2 conversion failed in DeliverOneTouchEvent (17) > > That's not cool :). > > > I have compiled all the sources for the XI2.1 mentioned on > > the https://wiki.ubuntu.com/Multitouch/XDevelopment page. > > I have used the mtdev1.0.11 version. > > Thanks for testing stuff out! We're getting close to pushing what we > have into Ubuntu, and every tester helps. In the future, I will suggest > filing bugs on launchpad for these issues. However, right now things are > still in enough flux that I would hold off from filing any bugs. Once we > get things into launchpad we'll want all the bug reports we can get :). > > -- Chase > -- Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning Maverick
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