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https://bugs.freedesktop.org/show_bug.cgi?id=8489
------- Additional Comments From [EMAIL PROTECTED] 2006-10-10 04:38 -------
(In reply to comment #20)
> This seems to be caused by an rgba vs argb problem. Bugzilla might destroy the
> formatting here, but you should still get the idea. If I have
> _dri_texformat_rgba8888 everything works fine (no blue patches) but if I have
> _dri_texformat_argb8888 then I get blue patches...
>
> I'm sure there is some higher-level reason why this doesn't work, but I'm not
> sure what that is...
>
> diff --git a/src/mesa/drivers/dri/r300/r300_tex.c
> b/src/mesa/drivers/dri/r300/r300_tex.c index 6348ba1..06edbe7 100644
> --- a/src/mesa/drivers/dri/r300/r300_tex.c
> +++ b/src/mesa/drivers/dri/r300/r300_tex.c
> @@ -385,7 +385,7 @@ #endif
> case GL_UNSIGNED_SHORT_5_6_5_REV:
> return _dri_texformat_rgb565;
> default:
> - return do32bpt ? _dri_texformat_argb8888 :
> + return do32bpt ? _dri_texformat_rgba8888 :
> _dri_texformat_rgb565;
> }
So, if you change the r300Choose8888TexFormat function it doesn't make a
difference at all, only if you change that GL_RGB case? This is really weird, it
would seem to indicate that the internal conversion from rgb, unsigned byte to
argb8888 (which is indeed more optimized than to rgba8888) would not work
correctly, but in this case you should get an error with glean's pixelFormats
test, so that can't really be.
That all doesn't make sense to me. Someone more familiar with that driver needs
to look into it.
As for the all-incorrect alpha values in glean with frag progs, I think the
reason for that could be a bug in the r300 frag prog parser, as color and alpha
sources are fully independant some special handling is needed there increasing
complexity and the likelyhood of bugs...
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