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Re: [fullscreen] Problems with mouse-edge scrolling and games

From: Thibaut Despoulain <thibaut@artillery.com>
Date: Sun, 23 Feb 2014 16:16:47 -0800
Message-ID: <CAASP90VGXTcq95f9EEOY91G8+WvNT6DCAvHjpn4x_RD-iWY=4w@mail.gmail.com>
To: Florian Bösch <pyalot@gmail.com>
Cc: Brandon Jones <bajones@google.com>, Ian Langworth <ian@artillery.com>, Webapps WG <public-webapps@w3.org>
>
> I've written a test for this here:
> http://codeflow.org/issues/software-cursor.html
>
> My observation from testing on linux is that I can't distinguish latency
> for the software cursor from the OS cursor (or not by much anyway) in
> google chrome. In firefox however there's noticable lag. Mileage may vary
> for other platforms.
>

This is true, but sadly your test runs on an empty animation frame. If your
main thread is doing a lot of work already (barely hitting the 60fps mark,
as it is the case for demanding games), the lag will be much more
perceptible as you will most likely drop a frame every now and then.

The reason the cursor is hidden when the pointer is locked is that some
> OSes don't have the ability to report relative mouse movement correctly at
> screen edges. This requires the cursors to constantly be reset to the
> center of the screen, which obviously would look strange if the cursor was
> visible.


Would that prevent vendors from implementing a pointer "edge grabbing"?
(preventing the cursor to exit the window but keeping the OS cursor as-is
while inside of it)



On Sun, Feb 23, 2014 at 7:30 AM, Florian Bösch <pyalot@gmail.com> wrote:

> On Sun, Feb 23, 2014 at 4:18 PM, Brandon Jones <bajones@google.com> wrote:
>
>> - it's possible to theme the OS cursor using custom images with CSS.
>> https://developer.mozilla.org/en-US/docs/Web/CSS/cursor/url
>>
> Although that doesn't absolve vendors from fixing the latency issue even
> if native pointers where to be made available during pointerlock. The
> reason is that cursors come in more flavors than an image. For example they
> could come in some variety of 3D rendered representations useful for the
> game in question.
>
>
>> - The reason the cursor is hidden when the pointer is locked is that some
>> OSes don't have the ability to report relative mouse movement correctly at
>> screen edges. This requires the cursors to constantly be reset to the
>> center of the screen, which obviously would look strange if the cursor was
>> visible.
>>
> Isn't that only a concern if you want to capture the cursor, not when you
> display the OS cursor?
>
>
>> - You already mentioned some issues with synthetic mouse events, but
>> unfortunately it's worse than you suspect. For example: sending a synthetic
>> click event to a checkbox doesn't actually change it's checked state. (Not
>> the last time I tried anyway) select controls also have a hard time with
>> synthetic events, and there's a whole host of other sub rely broken things.
>> :(
>>
> Is there a motivation not to make it work? Clickjacking?
>
Received on Monday, 24 February 2014 11:01:53 UTC

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