Bug 37075

Summary:	objview demo has messed up geometry with r300g
Product:	Mesa	Reporter:	almos <aaalmosss>
Component:	Drivers/Gallium/r300	Assignee:	Default DRI bug account <dri-devel>
Status:	VERIFIED FIXED	QA Contact:
Severity:	normal
Priority:	medium
Version:	git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	bunny.png ut2004.jpg objview debug output.txt

Description almos 2011-05-10 08:45:21 UTC

See the attached screenshot of the poor bunny. The buddha object is also quite wrong, bobcat is OK, and the right half of the biplane is wrong.

r300g of 7.10.2 and 7.11-dev both produce the same error. 

swrast of 7.10.2 shows no rendering errors, but llvmpipe of 7.11-dev doesn't even open a window (it does print ~5fps to the console though).

Comment 1 almos 2011-05-10 08:48:40 UTC

Created attachment 46555 [details]
bunny.png

Comment 2 almos 2011-05-27 08:02:01 UTC

Created attachment 47231 [details]
ut2004.jpg

I now spotted this phenomenon in ut2004 on the ONS-ArcticStronghold level. Normally this is not visible due to the fog (<Tab>show fog<Enter> turns it off).

It is interesting that only the remote objects have incorrect geometry, never the close ones.

Comment 3 Tom Stellard 2011-05-31 02:27:09 UTC

Could you run the program with RADEON_DEBUG=fp,vp and post the output.

Comment 4 almos 2011-05-31 05:04:53 UTC

Created attachment 47359 [details]
objview debug output.txt

The output of
RADEON_DEBUG=fp,vp ./objview
with mesa 7.11-dev.

Comment 5 Marek Olšák 2011-06-07 16:25:27 UTC

I can't reproduce this on r580. The bunny looks alright here.

Comment 6 almos 2011-06-08 13:45:53 UTC

Maybe it's a hw limitation on r3xx? Perhaps large vertex buffers should be broken down into smaller ones.

Comment 7 Marek Olšák 2011-06-08 16:31:35 UTC

Good point. We do split rendering commands with too many vertices into smaller ones, but the splitting was broken.

Fixed by 578d4539ba72a9f52e0cb3f615bb04bf9407b574. Closing.

Comment 8 almos 2011-06-09 01:53:24 UTC

Fix confirmed. Thanks.

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