On Tue, May 20, 2014 at 11:26 PM, Elias Vanderstuyft
[off-list ref] wrote:

On Tue, May 20, 2014 at 10:58 PM, Michal Malý
[off-list ref] wrote:

quoted

On Tuesday 20 of May 2014 16:16:12 simon@mungewell.org wrote:

quoted

Regarding the question of emulated vs. real effects, can we extend the API
so that applications can know which effects are really supported, and
enable/disable emulation somehow?

I suppose that a few extra flags (FF_PERIODIC_EMULATED etc.) defined in
"uapi/linux/input.h" should suffice.

@Dmitry:
Now that we're talking about API changes, I would like to propose some
additional things in the Linux FF API:

- Possibility to *get* FF state variables, such as the value of the
current GAIN, and the current AUTOCENTER:
At the moment, only *setting* is possible.
This poses a problem when implementing proper AUTOCENTER state
recovery (upon closing a Windows program) in Wine, because the initial
AUTOCENTER state was unknown.
The same applies for GAIN.

- Introduce multiple types of GAIN, apart from the current global
GAIN, e.g. GAIN_CONSTANT and GAIN_DAMPER:
This is mainly on request of some users, especially Logitech users: on
Windows Logitech additionally supports to set the global Damper and
Spring gain.
Maybe it would be nicer to create a global gain for every supported
Linux FF effect?

And Roland Bosa (from Logitech) also agrees with the following
addition/modification to the Linux FF API:

- Infinite iterations, or in Linux FF terms: playback of an effect
with an event count of infinity.
Right now, an event count of zero stops the effect, while the maximum
count is INT_MAX.
An event count value of '-1' can be used to indicate infinity.
(However note that it is somewhat inconsistent with the infinite
effect "duration" we already support: in that case '0' is used)
Is this feasible? (in terms of backward compatibility)

Thanks,
Elias
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