Bug 39083

Summary:	[regression, bisected, r600g] Wrong rendering of Bubbles3D screensaver
Product:	Mesa	Reporter:	Jure Repinc <jlp.bugs>
Component:	Drivers/Gallium/r600	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium
Version:	git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	bubble3d-good.png bubble3d-bad.png [PATCH] r600g: LIT: clamp negative src.y to 0

Description Jure Repinc 2011-07-08 23:45:41 UTC

Instead of looking smooth and nicely translucent some part of bubbles appear to be opaque. I've bisected and the commit that caused this bad rendering is:

86f8b4117f35c788c8a043c2e241eb19eaacae8c
- r600g: LIT: swap MUL_LIT operands to fix 0^0

This is on AMD Radeon HD 5750 and with XScreenSaver 5.14

Comment 1 Jure Repinc 2011-07-08 23:46:20 UTC

Created attachment 48911 [details]
bubble3d-good.png

Comment 2 Jure Repinc 2011-07-08 23:46:49 UTC

Created attachment 48912 [details]
bubble3d-bad.png

Comment 3 Vadim Girlin 2011-07-09 02:55:17 UTC

Created attachment 48913 [details] [review]
[PATCH] r600g: LIT: clamp negative src.y to 0

Does this patch help?

Comment 4 Jure Repinc 2011-07-09 08:10:44 UTC

Yes, with the patch applied the problem is gone. Thank you very much.

Comment 5 Alex Deucher 2011-07-10 10:33:03 UTC

Pushed:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=f0a7e28e29b5005c20ac02a7eec6511f6d7fd1c4

Thanks!

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