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Initialize facedir and wallmounted tables only once. 

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 Martínez 2016-02-09 21:46:22 -03:00 committed by Nils Dagsson Moskopp
parent c4db9d23ff
commit 60a5b2ac4d
Signed by: erle
GPG Key ID: A3BC671C35191080
1 changed files with 29 additions and 28 deletions
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57
builtin/game/item.lua
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@ -88,25 +88,26 @@ function core.dir_to_facedir(dir, is6d)
end
end
-- Table of possible dirs
local facedir_to_dir = {
{x= 0, y=0, z= 1},
{x= 1, y=0, z= 0},
{x= 0, y=0, z=-1},
{x=-1, y=0, z= 0},
{x= 0, y=-1, z= 0},
{x= 0, y=1, z= 0},
}
-- Mapping from facedir value to index in facedir_to_dir.
local facedir_to_dir_map = {
[0]=1, 2, 3, 4,
5, 2, 6, 4,
6, 2, 5, 4,
1, 5, 3, 6,
1, 6, 3, 5,
1, 4, 3, 2,
}
function core.facedir_to_dir(facedir)
--a table of possible dirs
return ({{x=0, y=0, z=1},
{x=1, y=0, z=0},
{x=0, y=0, z=-1},
{x=-1, y=0, z=0},
{x=0, y=-1, z=0},
{x=0, y=1, z=0}})
--indexed into by a table of correlating facedirs
[({[0]=1, 2, 3, 4,
5, 2, 6, 4,
6, 2, 5, 4,
1, 5, 3, 6,
1, 6, 3, 5,
1, 4, 3, 2})
--indexed into by the facedir in question
[facedir]]
return facedir_to_dir[facedir_to_dir_map[facedir]]
end
function core.dir_to_wallmounted(dir)
@ -131,17 +132,17 @@ function core.dir_to_wallmounted(dir)
end
end
-- table of dirs in wallmounted order
local wallmounted_to_dir = {
[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 = 0, y = 0, z = 1},
{x = 0, y = 0, z = -1},
}
function core.wallmounted_to_dir(wallmounted)
-- table of dirs in wallmounted order
return ({[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 = 0, y = 0, z = 1},
{x = 0, y = 0, z = -1}})
--indexed into by the wallmounted in question
[wallmounted]
return wallmounted_to_dir[wallmounted]
end
function core.get_node_drops(nodename, toolname)