[Mesa-dev] [Bug 47375] Blender crash on startup after upgrade to mesa 8.0.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=47375

--- Comment #44 from Roland Scheidegger <sroland at vmware.com> 2012-07-27 14:54:22 PDT ---
(In reply to comment #43)
> > Also fog fallback shouldn't apply to depth/stencil buffer drawing neither (but
> > OTOH enabled texturing should cause a fallback for color buffer drawing, even
> > though I'd guess if some app really does a drawpixels with enabled fog or
> > texturing it is probably by mistake not intentionally...).
> 
> Actually, I believe fog would apply to a glDrawPixels(GL_DEPTH) since we
> generate fragments with color + Z in that case and the colors would be
> subjected to fog, just like glDrawPixels(GL_RGB).  But it's a pretty obscure
> case and I'm not going to worry about it for now.
Yes but why would the generated color (modified by fog) matter in this case?
Also there's WAY more obscure cases which look handled wrong (I guess that we
don't see bugs filed about them is a testament that the whole "DrawPixel/Bitmap
is like ordinary rasterization" is a serious misdesign):
- enabled ColorSum (secondary color comes from current raster pos) for color
buffer drawing
- enabled AlphaTest (when drawing to stencil/depth buffer so color comes from
raster pos and not the pixel data)
- enabled texturing
- enabled fragment program / shader
- probably way more (crazy things like depth/stencil drawpixels with
multisampled buffer and alpha_to_coverage?)
At least I don't see how any of these could work with metaops.

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