[Mesa-dev] [PATCH v4 5/5] panfrost: Add support for KHR_partial_update()

[Alyssa Rosenzweig]

> There's no need to intersect the partial_update region with the
> scissor, since rendering outside of the partial_update area is
> explicitly undefined.

I think the idea is less about need and more about an extra
optimization. *Because* that outside rendering is explicitly undefined,
it's valid for us to scissor it out and save bandwidth later, even if
the app is too lazy to scissor itself. (Well-behaved apps should *also*
scissor explicitly but you know, undefined means we can do whatever is
fastest).
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