Bug 384052

Summary:	angular jagged lines when OPEN GL is turned on
Product:	[Applications] krita	Reporter:	jdreske
Component:	OpenGL Canvas	Assignee:	Krita Bugs <krita-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	halla
Priority:	NOR
Version First Reported In:	3.2.0
Target Milestone:	---
Platform:	Other
OS:	macOS
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	krita screenshot A3 600dpi 8,8% Zoom with OpenGl on an off

Description jdreske 2017-08-26 13:50:18 UTC

Created attachment 107533 [details]
krita screenshot A3 600dpi 8,8% Zoom with OpenGl on an off

Hi,
when I draw fast circular lines (Wacom Intuos pro PTH-651, Macbook pro 2016) the resulting lines are angular or jagged. Most noticeable on a big canvas, small zoom like A3 600dpi zoom 8,8%. (see attachment) I guess this bug is known (Bug 373676). 
But if I turn off OpenGL the lines are way better. (Unfortunately the display quality does not look as good.) 
Changing the "Scaling Mode", toggling "use texture buffer" or "instant preview mode", increasing Memory Limit to 12GB does not make any difference.

Comment 1 Halla Rempt 2017-08-26 14:48:36 UTC

Hi,

Yes, this does happen -- though weirdly enough not on my macbook pro. I really wonder what's up there, but it looks like on OSX, we're not getting tablet/mouse events if the gpu is redrawing. It's pretty well-known that opengl on OSX is Apple's red-headed stepchild :-(

*** This bug has been marked as a duplicate of bug 373676 ***