hmm I can confirm the problem with the test case, depending on what application you have this can be from absolutely not important to quite a deal-breaker... I would fill a bug.
2014-03-22 23:09 GMT+02:00 Willem Bennekom <cumul...@gmail.com>: > For me, the lagging is clearly noticeable on all platforms where vsync is > enabled. > (Macbook Pro (Nvidia), Linux/Windows Desktop with Nvidia, Windows Desktop > with AMD + Angle. > It hapopens with all Qt Quick versions.) > > Here's a minimal test scene (rectangle follows mouse): > http://pastie.org/pastes/8959817 > > 2014-03-22 18:37 GMT+01:00 Damian Ivanov <damianator...@gmail.com>: > >> 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 <cumul...@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 >> > >> > _______________________________________________ >> > Interest mailing list >> > Interest@qt-project.org >> > http://lists.qt-project.org/mailman/listinfo/interest >> > > > _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
