Is there the possibility to support EXA for legacy S3 chips?

Evgeny M. Zubok evgeny.zubok at
Thu May 28 01:00:26 PDT 2009

Ville Syrjälä <syrjala at> writes:

> Why wouldn't it work if you just allocate everything using the same
> pitch? Or does the allocator make some assumptions about the pitches
> the hardware can handle?

The allocator make the assumption that hardware is able to copy
offscreen pixmaps with any pitch and with any offset (only alignment can
be varied). There is no way to ask EXA always to allocate offscreen
pixmaps with fixed pitch. This option would be possible to implement
(something like pEXA->offscreenPitch = ...) but the modern and not so
modern hardware doesn't need it. Who cared about the ancient S3? :)

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