Bug 83810

Summary: Blender Weight paint mode doesn't work with enabled VBOs.
Product: Mesa Reporter: sunweb
Component: Drivers/Gallium/r600Assignee: Default DRI bug account <dri-devel>
Status: RESOLVED FIXED QA Contact:
Severity: normal    
Priority: medium    
Version: 10.1   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:

Description sunweb 2014-09-13 06:36:30 UTC 
HD 5770, OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.1.3

Download and unpack Blender from here http://www.blender.org/download/ or install from your distrution repository.

Exact steps to reproduce the error:

1) Open Blender and go to File -> User Preferences -> System OR press Ctrl+Alt+U and enable VBOs
2) Go to Edit mode(press Tab) on a default cube and for clear look for both problems(unable to paint and slowdowns) subdivide it atleast a few times(press W -> F6 -> Number of cuts 50*).
3) Go to Weight Paint mode(press Tab -> Ctrl+Tab) and make a stroke, you won't see anything painting and experience slowdowns.
4) Disable VBOs and repeat 2 and 3 steps and everything works and really fast then switch on VBOs again and your paint will disappear but turning off VBOs again will show the one you draw before.

* depending on your GPU the number might be higher. For example on my GPU 20 cuts on a cube won't show any performance decrease with VBOs on thus i am using 50 for more clear look at performance problem.

As described by many users VBOs should make everything faster not slower. And i've checked proprietary drivers VBOs work there but i have different troubles with them thus i am using the OSS one that has a very few non crucial broken features.
Comment 1 sunweb 2014-09-13 07:07:31 UTC 
Sorry corection for step 4:

4) Disable VBOs(as shown in step 1) and and make a stroke everything works and really fast then switch on VBOs again and your paint will disappear but turning off VBOs again will show the one you draw before.
Comment 2 Glenn Kennard 2014-09-14 13:28:09 UTC 
The weight paint not showing was fixed by https://bugs.freedesktop.org/show_bug.cgi?id=81967 which will be included in the 10.3 mesa release (isn't quite out the door yet though).

Three questions: is it a 512MB or 1GB 5770, and how much system RAM do you have? Do you get any messages in dmesg while running blender?
Comment 3 sunweb 2014-09-15 09:24:16 UTC 
(In reply to comment #2)
> The weight paint not showing was fixed by
> https://bugs.freedesktop.org/show_bug.cgi?id=81967 which will be included in
> the 10.3 mesa release (isn't quite out the door yet though).
> 
> Three questions: is it a 512MB or 1GB 5770, and how much system RAM do you
> have? Do you get any messages in dmesg while running blender?

Well, fix is there and sooner or later i could use it, thank you!

5770 is 1Gb and i have 12Gb of RAM. I'll answer on dmesg question as soon as i'm home.
Comment 4 sunweb 2014-09-15 14:59:45 UTC 
When running Blender i get no messages in dmesg.
Comment 5 sunweb 2014-09-29 19:35:40 UTC 
I just tried new mesa, it is fixed thanks.

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