Hi Chris!
Am Sonntag 15 Juni 2008 14:01:09 schrieb Chris Rankin:
> Since R300 now supports GL_ARB_shadow I thought I'd try running the
> shadowtex program. When I start the program, all I see is a black window.
> However, I can then cycle through the various comparison modes to get the
> following results:
>
> GL_LESS: blank
> GL_GEQUAL: coloured shapes
> GL_GREATER: coloured shapes
> GL_EQUAL: blank
> GL_NOTEQUAL: blank
> GL_ALWAYS: coloured shapes
> GL_NEVER: blank
> GL_LEQUAL: blank
>
> Are these correct, please? I would have thought that the program would at
> least *start* in a mode that generated some output.
This is a known problem, and it's on my todo list.
So far I have only been able to do a preliminary analysis, which points to an
incorrect "distance from light source" calculation (as opposed to a problem
in the ARB_shadow implementation); my evidence for this is:
1. Check out the 'd' mode of shadowtex; the values appear to be smaller than
they should be (by comparing to software rendered Mesa).
2. Change the Z bias ('b'/'B') by an insane amount, and things will start to
become visible.
So it appears that some other part of the pipeline is at fault here (perhaps
it's texgen, but glean/texgen passes), or perhaps some problem with how the
different parts interact.
Once I understand the problem I will isolate it into a Piglit test and then
produce a fix, as soon as my next "go into R300 hacking mode for 24+ hours"
cycle starts.
cu,
Nicolai
> Cycling though "fragment program modes" gives nothing except a blank window
> and the following message:
>
> Using fragment program without "OPTION ARB_fragment_program_shadow"
>
> Cheers,
> Chris
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