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docs: Document the implicit barriers around blits

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We're going to use resource_copy_region to copy from a resource that has
been written to with imageStore. Make it clear that this is safe.

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19827>
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Nanley Chery
2022-11-23 16:20:43 -08:00
committed by Marge Bot
parent 6043f66dd3
commit 0a5a54b81a
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docs/gallium/context.rst
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@@ -665,8 +665,10 @@ Blitting
These methods emulate classic blitter controls.
These methods operate directly on ``pipe_resource`` objects, and stand
apart from any 3D state in the context. Blitting functionality may be
moved to a separate abstraction at some point in the future.
apart from any 3D state in the context. Each method is assumed to have an
implicit memory barrier around itself. They do not need any explicit
``memory_barrier``. Blitting functionality may be moved to a separate
abstraction at some point in the future.
``resource_copy_region`` blits a region of a resource to a region of another
resource, provided that both resources have the same format, or compatible