Michel Dänzer wrote:
> On Fri, 2006-09-08 at 14:23 +0200, Roland Scheidegger wrote:
>> Everyone and their uncle uses just GL_UNSIGNED_BYTE as type, and
>> since we're using _mesa_texformat_rgba8888 (not the _rev type) that
>> will cause a slow path.
> 
> Could AIGLX avoid this by using something other than GL_UNSIGNED_BYTE
>  though? E.g. I've hacked around endianness issues by using 
> GL_UNSIGNED_INT_8_8_8_8_REV instead.
I guess it wouldn't really help if the pixmap data is in another format.

>> In theory it might be possible to configure the chip to do
>> endianness swapping on its own (so we could use the rgba8888_rev
>> format in cases the src format is rgba8888), but it's probably not
>> worth the effort.
> 
> In my experience, the texture byteswapping bits have no effect, but
> the R200 engine actually supports an ABGR format. See 
> https://bugs.freedesktop.org/show_bug.cgi?id=6819 .
Ah that looks nice. Should make it possible to pretty much always hit 
the fast memcopy path (if the source data is in a "common" 8888 format), 
maybe it's worth the effort.

Roland

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