Bug 300349

Summary:	Make ShaderManager act as a real stack
Product:	[Plasma] kwin	Reporter:	Thomas Lübking <thomas.luebking>
Component:	compositing	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	CONFIRMED ---
Severity:	normal	CC:	woebbeking
Priority:	NOR
Version:	unspecified
Target Milestone:	4.11
Platform:	unspecified
OS:	Linux
Latest Commit:		Version Fixed In:

Description Thomas Lübking 2012-05-20 11:15:30 UTC

See eg. https://git.reviewboard.kde.org/r/104918/

The issue here is that the shadermanager just restores the used shader, but not the uniforms etc. so that if you push a shader, alter some uniforms and pop the shader, that does not mean you end up where you started. Instead you've to 
- store all uniforms you might touch
- push the shader again when done (to ensure you alter the right one and nothing else has currently pushed the other shader) and reset uniforms.

Comment 1 Justin Zobel 2021-03-10 00:12:34 UTC

Thank you for the bug report.

As this report hasn't seen any changes in 5 years or more, we ask if you can please confirm that the issue still persists.

If this bug is no longer persisting or relevant please change the status to resolved.

Comment 2 Thomas Lübking 2021-03-10 07:16:58 UTC

Not a bug bug code deficiency that lead to clumsy client code as illustrated by the patch in the (now 404) review link (was a fix by Martin to the desktop cube effect)