[Interest] Input Latency Issues in QtQuick

[Damian Ivanov]

for the record: I can't confirm this, QML input is instantly here free
radeon driver (5series) on openSUSE 13.1 64bit.

2014-03-22 15:46 GMT+01:00 Willem Bennekom <cumulatm at gmail.com>:
> With its current architecture, QtQuick has input latency issues:
> The scene reacts to user input with a slight, but noticeable delay, which
> makes
> QtQuick apps feel clumsy and unpleasant to use.
>
> I guess this is related to vsync handling, where input events don't
> immediately
> trigger a repaint while the render thread waits until the framebuffer is
> swapped.
>
> The only exception are Windows platforms with native OpenGL on ATI cards,
> where the framerate seems to be uncapped:
> The rendering is super responsive, almost like Qt Widgets.
> The drawback is that render thread animators are broken, as they aren't
> synced to 60 Hz.
>
> 1. Is there a way to hack Qt to get this Windows+OpenGL+ATI rendering
> behavior on all platforms?
>    Maybe some tweaks in qsg*renderloop.cpp?
>
> 2. Are there plans to implement a rendering scheme that reduces input
> latency?
>
> Thanks
> Willem
>
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