tree 03d8755d0f883e2f95ac570d6d09c743f57f133c
parent 106e7ff887b77829e1ce1f4f118dba1e855d7547
author John Stiles <johnstiles@google.com> 1632409652 -0400
committer SkCQ <skcq-be@skia-corp.google.com.iam.gserviceaccount.com> 1632427135 +0000

Implement switch in SkVM.

SkVM implements switches as a pseudo-loop; breaks are handled with the
condition mask just like a for loop. Fallthrough is handled via a
scratch Value in a temporary slot. `writeStore` neeeded to be refactored
to support writing into slot(s) without an associated Variable.

At IR generation time, SwitchStatements are now emitted without error
even in strict-ES2 mode. The GLSL code generator currently reports these
as an error in strict-ES2 mode, but this will be fixed in a followup
coming shortly (the switch will be rewritten as ifs inside a one-shot
loop, similar to our IR-rewrite strategy).

Change-Id: I5507257246c42a35d2f46b4b9a89492a5ffeff9b
Bug: skia:12450
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/451421
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>