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Fix line endings
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daimond113
parent
35cb0bca4e
commit
252b07a62a
2 changed files with 104 additions and 104 deletions
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@ -1,60 +1,60 @@
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-- Using world:target is the recommended way to grab the target in a wildcard
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-- query. However the random access can add up in very hot paths. Accessing its
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-- column can drastically improve performance, especially when there are
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-- multiple adjacent pairs.
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local jecs = require("@jecs")
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local pair = jecs.pair
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local __ = jecs.Wildcard
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local world = jecs.world()
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local Likes = world:entity()
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local function name(e, name: string): string
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if name then
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world:set(e, jecs.Name, name)
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return name
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end
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return assert(world:get(e, jecs.Name))
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end
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local e1 = world:entity()
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name(e1, "e1")
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local e2 = world:entity()
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name(e2, "e2")
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local e3 = world:entity()
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name(e3, "e3")
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world:add(e1, pair(Likes, e2))
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world:add(e1, pair(Likes, e3))
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local likes = jecs.component_record(world, pair(Likes, __))
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assert(likes)
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local likes_cr = likes.records
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local likes_counts = likes.counts
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local archetypes = world:query(pair(Likes, __)):archetypes()
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for _, archetype in archetypes do
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local types = archetype.types
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-- Get the starting index which is what the (R, *) alias is at
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local wc = likes_cr[archetype.id]
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local count = likes_counts[archetype.id]
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local entities = archetype.entities
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for i = #entities, 1, -1 do
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-- It is generally a good idea to iterate backwards on arrays if you
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-- need to delete the iterated entity to prevent iterator invalidation
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local entity = entities[i]
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for cr = wc, wc + count - 1 do
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local person = jecs.pair_second(world, types[cr])
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print(`entity ${entity} likes ${person}`)
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end
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end
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end
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-- Output:
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-- entity $273 likes $275
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-- entity $273 likes $274
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-- Using world:target is the recommended way to grab the target in a wildcard
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-- query. However the random access can add up in very hot paths. Accessing its
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-- column can drastically improve performance, especially when there are
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-- multiple adjacent pairs.
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local jecs = require("@jecs")
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local pair = jecs.pair
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local __ = jecs.Wildcard
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local world = jecs.world()
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local Likes = world:entity()
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local function name(e, name: string): string
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if name then
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world:set(e, jecs.Name, name)
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return name
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end
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return assert(world:get(e, jecs.Name))
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end
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local e1 = world:entity()
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name(e1, "e1")
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local e2 = world:entity()
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name(e2, "e2")
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local e3 = world:entity()
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name(e3, "e3")
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world:add(e1, pair(Likes, e2))
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world:add(e1, pair(Likes, e3))
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local likes = jecs.component_record(world, pair(Likes, __))
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assert(likes)
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local likes_cr = likes.records
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local likes_counts = likes.counts
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local archetypes = world:query(pair(Likes, __)):archetypes()
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for _, archetype in archetypes do
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local types = archetype.types
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-- Get the starting index which is what the (R, *) alias is at
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local wc = likes_cr[archetype.id]
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local count = likes_counts[archetype.id]
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local entities = archetype.entities
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for i = #entities, 1, -1 do
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-- It is generally a good idea to iterate backwards on arrays if you
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-- need to delete the iterated entity to prevent iterator invalidation
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local entity = entities[i]
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for cr = wc, wc + count - 1 do
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local person = jecs.pair_second(world, types[cr])
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print(`entity ${entity} likes ${person}`)
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end
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end
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end
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-- Output:
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-- entity $273 likes $275
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-- entity $273 likes $274
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@ -1,44 +1,44 @@
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-- To get the most out of performance, you can lift the inner loop of queries to
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-- the system in which you can do archetype-specific optimizations like finding
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-- the parent once per archetype rather than per entity.
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local jecs = require("@jecs")
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local pair = jecs.pair
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local ChildOf = jecs.ChildOf
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local __ = jecs.Wildcard
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local world = jecs.world()
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local Position = world:component() :: jecs.Id<vector>
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local Visible = world:entity()
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local parent = world:entity()
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world:set(parent, Position, vector.zero)
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world:add(parent, Visible)
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local child = world:entity()
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world:set(child, Position, vector.one)
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world:add(child, pair(ChildOf, parent))
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local parents = jecs.component_record(world, pair(ChildOf, __))
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assert(parents)
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local parent_cr = parents.records
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local archetypes = world:query(Position, pair(ChildOf, __)):archetypes()
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for _, archetype in archetypes do
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local types = archetype.types
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local p = jecs.pair_second(world, types[parent_cr[archetype.id]])
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if world:has(p, Visible) then
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local columns = archetype.columns_map
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local positions = columns[Position]
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for row, entity in archetype.entities do
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local pos = positions[row]
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print(`Child ${entity} of ${p} is visible at {pos}`)
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end
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end
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end
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-- Output:
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-- Child $274 of $273 is visibile at 1,1,1
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-- To get the most out of performance, you can lift the inner loop of queries to
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-- the system in which you can do archetype-specific optimizations like finding
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-- the parent once per archetype rather than per entity.
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local jecs = require("@jecs")
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local pair = jecs.pair
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local ChildOf = jecs.ChildOf
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local __ = jecs.Wildcard
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local world = jecs.world()
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local Position = world:component() :: jecs.Id<vector>
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local Visible = world:entity()
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local parent = world:entity()
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world:set(parent, Position, vector.zero)
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world:add(parent, Visible)
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local child = world:entity()
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world:set(child, Position, vector.one)
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world:add(child, pair(ChildOf, parent))
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local parents = jecs.component_record(world, pair(ChildOf, __))
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assert(parents)
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local parent_cr = parents.records
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local archetypes = world:query(Position, pair(ChildOf, __)):archetypes()
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for _, archetype in archetypes do
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local types = archetype.types
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local p = jecs.pair_second(world, types[parent_cr[archetype.id]])
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if world:has(p, Visible) then
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local columns = archetype.columns_map
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local positions = columns[Position]
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for row, entity in archetype.entities do
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local pos = positions[row]
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print(`Child ${entity} of ${p} is visible at {pos}`)
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end
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end
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end
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-- Output:
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-- Child $274 of $273 is visibile at 1,1,1
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