MWRender slowdown

[Zini]

A while back someone reported that the MWRender refactoring resulted in a significant FPS drop in exteriors. I am semi-convinced now that such a slowdown exists. I would like more input from other other developers. Do you see such a slowdown too? And if yes, anyone any idea what is causing it?

I have two branches in my repository (mwrender and nomwrender) that should offer a convenient way to compare performance. Don't use the master branch, because it contains other rendering stuff that will affect FPS:

[swick]

70-420 in interiors
20-250 in exteriors
in both branshes
If i look at all objects in the cell the fps goes down to about 20fps. When I look at a wall directly in front of me and all other objects are behind the wall the frames are still low. If I look into the sky the fps gets around 250fps. I dont know... but should'nt it ignore whatever is behind the wall?

[lgromanowski]

Hi,
I don't see any major difference in fps between mwrender branch and nomwrender branch on integrated Intel video card (fps is between 29 and 60 frames).

[Zini]

Okay then lets chalk up the FPS variations I saw to measurement errors for now.

[corristo]

I experienced such slowdown. I profiled app and looks like that there is problem with bullet (strange?).

Here is profiling report https://gist.github.com/311bb9c9d6bae6aafbbd

I just can't move in exteriors ~1 fps.

P.S. I'm using bullet 2.79

UPD:
tried nomwrender... no luck, looks like bullet issue. I'll try to fallback to older version.

UPD2:
On bullet 2.77 everything is ok.

[Zini]

That is a known issue. A regression in bullet (newer than 2.77 I think).

[psi29a]

When the release 0.12 is out the door, can we also release a list of libraries to compile against for the package maintainers? I would hate to make a release using the wrong/buggy libraries.

known good libraries:
libbullet = 2.77

[Zini]

I think there is such a list in the wiki. But it probably needs updating.

[Yacoby]

I experienced such slowdown. I profiled app and looks like that there is problem with bullet (strange?).

Here is profiling report https://gist.github.com/311bb9c9d6bae6aafbbd

I just can't move in exteriors ~1 fps.

P.S. I'm using bullet 2.79

UPD:
tried nomwrender... no luck, looks like bullet issue. I'll try to fallback to older version.

UPD2:
On bullet 2.77 everything is ok.

Cheers for posting this. I was having real problems in exteriors.

[sirherrbatka]

swick said that the problem is fixed on the recent svn revision of bullet as well.