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authorGriffin Smith <grfn@gws.fyi>2021-06-12T18·41-0400
committergrfn <grfn@gws.fyi>2021-06-12T18·57+0000
commitc19e3dae5f6087c7e446c6be620c370d9957cf7c (patch)
tree29c3c1206c615478cac96da978c96271b05e4f1b /.git-blame-ignore-revs
parent80d501d553b4aa5c7f687c69cb473ea2ac299354 (diff)
feat(xanthous): Memoize characterVisiblePositions r/2653
Memoize the return value of characterVisiblePositions to a new,
semi-abstracted "memo" field on the GameState, recalcuclated if the
character position ever changes. I'm 90% sure that the perf issues we
were encountering were actually caused by characterVisiblePositions
getting called once for *every tile* on draw, but this slightly larger
change also makes the game perform relatively-usably again.

Since this is only recalculated if the character position changes, if we
ever get non-transparent entities moving around without the characters
influence (maybe something building or knocking down walls?) we'll have
an issue there where the vision won't be updated as a result of those
changes if they happen while the character is taking a non-moving action
- but we can cross that bridge when we come to it.

Change-Id: I3fc745ddf0014d6f164f735ad7e5080da779b92a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3185
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
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