[Mesa-dev] [PATCH] drisw/gallium/llvmpipe: add MESA_copy_sub_buffer support

[Dave Airlie]

> Instead of I'd prefer that we added an optional rectangle structure pointer to flush_frontbuffer. Less one entrypoint, and both paths can probably share a lot of code in most cases.  Ditto for sw_winsys.h.
>

Yeah I thought someone might suggest that, it was just a lot larger
patch results, have to change all the graw tests etc, I'll do that it
was just harder to see the changes in the noise!

> This should be documented in src/gallium/docs.
>

I'll add that as well.

Dave.