hi
I am currently implementing support for XInput(2) devices in GNU Xnee,
starting out with recording events.
Xnee gets copies of events from the X Server (using the RECORD
extension). It seems to be a problem in the RECORD extension regarding
XI (or XI(2)), but I am not sure and it would be great to get feedback.
I'll try to describe the problem as good as I can.
---
When reading the XInput spec and the corresponding source code I
understand it as one XI2 event is packed into two "normal" events. I
started by implementing support for MotionEvents. This worked out rather
well. Xnee receives four "normal" events and packs them into two XI2
events (one from the master and one from the slave) and prints them out.
When moving a pointer one pixel Xnee gets (event, detail):
83 detail=0
78 detail=9
83 detail=0
78 detail=13
The event base for XI is 78, so it looks ok to me. The detail is set
to the deviceid of the input device (when not 0).
But when adding support for ButtonPress and ButtonRelease I don't get
the 4 events for every press (or release). And the detail is always set
to the number of the button pressed.
When pressing a button Xnee gets (event, detail):
81 detail=1
81 detail=1
82 detail=2
82 detail=2
When reading the source code of XInputWireToEvent
(libXi/src/XExtInt.c) it looks as if the client side of XI does pack two
events together to one.
Since RECORD doesn't give Xnee normal client side events (as normal
apps get from client libs) but rather "limited" copies directly from the
server, it seems to be something odd in the RECORD extension (or with my
code).
Most of my tests are done using swinput (Linux module) with support
for 8 input devices, but I've tested with real devices as well.
Any input is welcome.
regards, Henrik Sandklef
GNU Xnee version:
============================================
Latest on Branch: xinput2-support
with some minor local modifications
My system:
============================================
name of display: :2.0
version number: 11.0
vendor string: The X.Org Foundation
vendor release number: 10706000
X.Org version: 1.7.6
maximum request size: 16777212 bytes
motion buffer size: 256
bitmap unit, bit order, padding: 32, LSBFirst, 32
image byte order: LSBFirst
number of supported pixmap formats: 7
supported pixmap formats:
depth 1, bits_per_pixel 1, scanline_pad 32
depth 4, bits_per_pixel 8, scanline_pad 32
depth 8, bits_per_pixel 8, scanline_pad 32
depth 15, bits_per_pixel 16, scanline_pad 32
depth 16, bits_per_pixel 16, scanline_pad 32
depth 24, bits_per_pixel 32, scanline_pad 32
depth 32, bits_per_pixel 32, scanline_pad 32
keycode range: minimum 8, maximum 255
focus: window 0x3200004, revert to Parent
number of extensions: 27
BIG-REQUESTS
Composite
DAMAGE
DOUBLE-BUFFER
DPMS
DRI2
GLX
Generic Event Extension
MIT-SCREEN-SAVER
MIT-SHM
RANDR
RECORD
RENDER
SECURITY
SGI-GLX
SHAPE
SYNC
X-Resource
XC-MISC
XFIXES
XFree86-DGA
XFree86-VidModeExtension
XINERAMA
XInputExtension
XKEYBOARD
XTEST
XVideo
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