Bug 4860

Summary:	Software rasterizer polygon offset problem
Product:	Mesa	Reporter:	Brian Paul <brian.paul>
Component:	Mesa core	Assignee:	mesa-dev
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	high
Version:	unspecified
Hardware:	x86 (IA32)
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Brian Paul 2005-10-24 07:59:42 UTC

For deep Z buffers (24-bit or more) we may be adding a relatively small polygon
offset factor to a relatively large Z value, thus the offset value can get
"lost"   Should probably do the offset addition with integer Z values during
rasterization.

Relevant code is in swrast_setup/ss_tritemp.h

Reported to Brian by Dan Schikore

Comment 1 Corbin Simpson 2010-03-27 04:29:57 UTC

I think all the software rasterizers pass the relevant piglit tests, don't they? If not, we can re-open and track from here.

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