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Initialize facedir and wallmounted tables only once.

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This makes the functions a bit faster since they don't
have to recreate the tables every invocation, and makes
the code more readable.

Also, document `wallmounted_to_dir`.

The function was implemented but not documented in `lua_api.txt`.
This commit is contained in:
Diego Martinez 2016-02-09 21:46:22 -03:00 committed by paramat
parent 0f03547b03
commit 13dd7959db
2 changed files with 31 additions and 28 deletions
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35
builtin/game/item.lua
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@ -88,25 +88,26 @@ function core.dir_to_facedir(dir, is6d)
end end
end end
function core.facedir_to_dir(facedir) -- Table of possible dirs
--a table of possible dirs local facedir_to_dir = {
return ({{x=0, y=0, z=1}, {x= 0, y=0, z= 1},
{x= 1, y=0, z= 0}, {x= 1, y=0, z= 0},
{x= 0, y=0, z=-1}, {x= 0, y=0, z=-1},
{x=-1, y=0, z= 0}, {x=-1, y=0, z= 0},
{x= 0, y=-1, z= 0}, {x= 0, y=-1, z= 0},
{x=0, y=1, z=0}}) {x= 0, y=1, z= 0},
}
--indexed into by a table of correlating facedirs -- Mapping from facedir value to index in facedir_to_dir.
[({[0]=1, 2, 3, 4, local facedir_to_dir_map = {
[0]=1, 2, 3, 4,
5, 2, 6, 4, 5, 2, 6, 4,
6, 2, 5, 4, 6, 2, 5, 4,
1, 5, 3, 6, 1, 5, 3, 6,
1, 6, 3, 5, 1, 6, 3, 5,
1, 4, 3, 2}) 1, 4, 3, 2,
}
--indexed into by the facedir in question function core.facedir_to_dir(facedir)
[facedir]] return facedir_to_dir[facedir_to_dir_map[facedir]]
end end
function core.dir_to_wallmounted(dir) function core.dir_to_wallmounted(dir)
@ -131,17 +132,17 @@ function core.dir_to_wallmounted(dir)
end end
end end
function core.wallmounted_to_dir(wallmounted)
-- table of dirs in wallmounted order -- table of dirs in wallmounted order
return ({[0] = {x = 0, y = 1, z = 0}, local wallmounted_to_dir = {
[0] = {x = 0, y = 1, z = 0},
{x = 0, y = -1, z = 0}, {x = 0, y = -1, z = 0},
{x = 1, y = 0, z = 0}, {x = 1, y = 0, z = 0},
{x = -1, y = 0, z = 0}, {x = -1, y = 0, z = 0},
{x = 0, y = 0, z = 1}, {x = 0, y = 0, z = 1},
{x = 0, y = 0, z = -1}}) {x = 0, y = 0, z = -1},
}
--indexed into by the wallmounted in question function core.wallmounted_to_dir(wallmounted)
[wallmounted] return wallmounted_to_dir[wallmounted]
end end
function core.get_node_drops(nodename, toolname) function core.get_node_drops(nodename, toolname)

2
doc/lua_api.txt
View File

@ -2153,6 +2153,8 @@ and `minetest.auth_reload` call the authetification handler.
* Convert a facedir back into a vector aimed directly out the "back" of a node * Convert a facedir back into a vector aimed directly out the "back" of a node
* `minetest.dir_to_wallmounted(dir)` * `minetest.dir_to_wallmounted(dir)`
* Convert a vector to a wallmounted value, used for `paramtype2="wallmounted"` * Convert a vector to a wallmounted value, used for `paramtype2="wallmounted"`
* `minetest.wallmounted_to_dir(wallmounted)`
* Convert a wallmounted value back into a vector aimed directly out the "back" of a node
* `minetest.get_node_drops(nodename, toolname)` * `minetest.get_node_drops(nodename, toolname)`
* Returns list of item names. * Returns list of item names.
* **Note**: This will be removed or modified in a future version. * **Note**: This will be removed or modified in a future version.