1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
local current_scene = nil
local comp_inits = {}
local comp_deinits = {}
function TAGCOMP(_) end
function new_scene()
local newscene = {
compmask = {},
entities = {},
entities_size = 0,
free_entids = {},
free_entids_size = 0,
killset = {},
killq = {},
killq_size = 0,
-- Events
on_draw = new_event(),
on_update = new_event(),
comp_removeq = {},
comp_entq = {},
comp_removeq_size = 0,
}
for comp, _ in pairs(comp_inits) do
newscene.compmask[comp] = {
sparse = {},
dense = {},
size = 0,
}
end
return newscene
end
function set_scene(newscene)
current_scene = newscene
end
function get_current_scene()
return current_scene
end
function register_comp(name, init, deinit)
assert(comp_inits[name] == nil, "Component '"..name.."' is already registered.")
comp_inits[name] = init
comp_deinits[name] = deinit
end
function add_comp(ent, comp, ...)
assert(current_scene, "No scene up.")
assert(comp_inits[comp], "Unknown component '"..tostring(comp).."'")
assert(current_scene.entities[ent.id], "Entity "..tostring(ent.id).." doesn't exist.")
local mask = current_scene.compmask[comp]
assert(not mask.sparse[ent.id], "Entity "..tostring(ent.id).." already has component of type '"..comp.."'.")
mask.size = mask.size + 1
mask.sparse[ent.id] = mask.size
mask.dense[mask.size] = ent.id
comp_inits[comp](current_scene.entities[ent.id], ...)
end
local function remove_comp(ent, comp)
assert(current_scene, "No scene up.")
assert(comp_inits[comp], "Unknown component '"..tostring(comp).."'")
assert(current_scene.entities[ent.id], "Entity "..tostring(ent.id).." doesn't exist.")
local deinit = comp_deinits[comp]
if deinit then
deinit(ent)
end
local mask = current_scene.compmask[comp]
assert(mask.sparse[ent.id], "Entity "..tostring(ent.id).." does not have component of type '"..comp.."'.")
local index = mask.sparse[ent.id]
local lastid = mask.dense[mask.size]
mask.sparse[ent.id] = nil
mask.sparse[lastid] = index
mask.dense[index] = mask.dense[mask.size]
mask.dense[mask.size] = nil
mask.size = mask.size - 1
end
function run_system(comp, func, ...)
assert(current_scene, "No scene up.")
assert(comp_inits[comp], "Unknown component '"..tostring(comp).."'")
for _, entid in ipairs(current_scene.compmask[comp].dense) do
func(current_scene.entities[entid], ...)
end
end
function queue_entity_kill(ent)
assert(current_scene, "No scene up.")
assert(current_scene.entities[ent.id], "Entity "..tostring(ent.id).." doesn't exist.")
if current_scene.killset[ent.id] then
return
end
current_scene.killset[ent.id] = true
current_scene.killq_size = current_scene.killq_size + 1
current_scene.killq[current_scene.killq_size] = ent.id
end
function has_comp(ent, comp)
assert(current_scene, "No scene up.")
assert(comp_inits[comp], "Unknown component '"..tostring(comp).."'")
assert(current_scene.entities[ent.id], "Entity "..tostring(ent.id).." doesn't exist.")
return current_scene.compmask[comp].sparse[ent.id] ~= nil
end
function queue_remove_comp(ent, comp)
assert(current_scene, "No scene up.")
assert(comp_inits[comp], "Unknown component '"..tostring(comp).."'")
if not has_comp(ent, comp) then return end
current_scene.comp_removeq_size = current_scene.comp_removeq_size + 1
current_scene.comp_removeq[current_scene.comp_removeq_size] = comp
current_scene.comp_entq[current_scene.comp_removeq_size] = ent
end
function flush_scene()
assert(current_scene, "No scene up.")
for i=1, current_scene.comp_removeq_size do
remove_comp(current_scene.comp_entq[i], current_scene.comp_removeq[i])
end
current_scene.comp_removeq_size = 0
for i=current_scene.killq_size, 1, -1 do
local ent = current_scene.entities[current_scene.killq[i]]
for comp, _ in pairs(current_scene.compmask) do
if has_comp(ent, comp) then
remove_comp(ent, comp)
end
end
current_scene.killset[ent.id] = nil
current_scene.free_entids_size = current_scene.free_entids_size + 1
current_scene.free_entids[current_scene.free_entids_size] = ent.id
end
current_scene.killq_size = 0
end
function new_entity()
assert(current_scene, "No scene up.")
if current_scene.free_entids_size > 0 then
local entid = current_scene.free_entids[current_scene.free_entids_size]
current_scene.free_entids_size = current_scene.free_entids_size - 1
local ent = current_scene.entities[entid]
for key in pairs(ent) do
ent[key] = nil
end
ent.id = entid
return ent
end
local newid = current_scene.entities_size + 1
current_scene.entities[newid] = {id = newid}
current_scene.entities_size = newid
return current_scene.entities[newid]
end
|
