[graphite] Add vertex/instance attribute definition to RenderStep
Moves Attribute into its own header. I did not move AttributeSet/Iter
out of GraphicsPipelineDesc because RenderStep should be able to just
rely on SkSpan<Attribute>. Since they are fixed definitions, there
shouldn't be a need to support skipping over uninitialized attrs. Once
GraphicsPipelineDesc just points to a RenderStep, AttributeSet/Iter can
be deleted.
Bug: skia:12466
Change-Id: I3b01b6283669fc02dc9cd0521bb236a9d0daa5eb
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/474136
Auto-Submit: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
6 files changed