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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
local ecs = require 'honey.ecs'
local gl = honey.gl
local glfw = honey.glfw
local module = {}
setmetatable(module, {__index=_G})
setfenv(1, module)
-- helper function for retrieving script functions
local function getFunction(script)
local f = require(script.script)
if script.func then
return f[script.func]
else
return f
end
end
--===== dispatch messages to handlers =====--
dispatch = function(entities, msg, data)
local query = entities:queryComponent(msg)
for id, handler in pairs(query) do
local f = getFunction(handler)
f(entities, id, data)
end
end
--===== transform cascading =====--
transform = function(params)
return {
db = params.db,
update = function(self, dt)
local entities = self.db:queryComponent("transform")
-- prepare transforms
for id, transform in pairs(entities) do
transform._visited = false
end
-- helper function
local function recursiveTransform(transform)
if transform._visited then
return transform._matrix
end
if not transform.parent then
transform._matrix = transform.matrix
else
local parentTransform = self.db:getComponent(transform.parent, "transform")
local parentMatrix = recursiveTransform(parentTransform)
transform._matrix = parentMatrix * transform.matrix
end
transform._visited = true
return transform._matrix
end
-- compute transforms
for id, transform in pairs(entities) do
recursiveTransform(transform)
end
end,
priority = 0,
}
end
--===== rendering =====--
function renderCamera(params)
return {
camera = params.camera,
db = params.db,
priority = params.priority or 99,
update = function(self, dt)
local cameraParams = self.db:getComponent(self.camera, "camera")
local cameraTransform = self.db:getComponent(self.camera, "transform")
local view
if cameraTransform then
view = cameraTransform._matrix
else
view = Mat4():identity()
end
local entities = self.db:queryComponent("renderMesh")
for entity, tbl in pairs(entities) do
-- get shader
local shader = honey.shader.loadShader(tbl.shader.vertex, tbl.shader.fragment)
shader:use()
-- bind textures
local texOffset = 0
for name, texTbl in pairs(tbl.textures or {}) do
local texture = honey.image.loadImage(texTbl.filename, texTbl.params)
gl.BindTexture(gl.TEXTURE_2D + texOffset, texture.texture)
shader:setInt(name, texOffset)
texOffset = texOffset + 1
end
-- configure default uniforms
local query = self.db:getComponent(entity, "transform")
local model = (query and query._matrix) or Mat4():identity()
shader:configure{
float={
time=glfw.GetTime(),
},
matrix={
view=view,
projection=cameraParams.projection,
model=model,
},
}
-- draw mesh
local mesh = honey.mesh.loadMesh(tbl.mesh.filename, tbl.mesh.index)
mesh:drawElements()
-- unbind textures
for i=0,texOffset-1 do
gl.BindTexture(gl.TEXTURE_2D + i, 0)
end
end
end,
}
end
--===== script system =====--
script = function(params)
return {
db=params.db,
update=function(self, dt)
local entities = self.db:queryComponent("script")
for id, script in pairs(entities) do
local f = getFunction(script)
f(self.db, id, dt)
end
end
}
end
--===== physics =====--
physics = function(params)
local interval = params.interval or 0.01
local groupSize = params.groupSize or 20
return {
db=params.db,
space=params.space,
world=params.world,
contactGroup=ode.JointGroupCreate(groupSize),
time=interval,
update=function(self, dt)
local query = self.db:queryComponent("physics")
-- TODO: create physics bodies
self.time = self.time + dt
-- only run the update every [interval] seconds
if self.time > interval then
self.time = self.time - interval
-- check for near collisions between geoms
ode.SpaceCollide(self.space, function(a, b)
-- check for actual collisions
local collisions = ode.Collide(a, b, 1)
if #collisions > 0 then
-- set up the joint params
local contact = ode.CreateContact{ surface={
mode = ode.ContactBounce + ode.ContactSoftCFM,
mu = ode.Infinity,
bounce = 0.90,
bounce_vel = 0.1,
soft_cfm = 0.001,
}}
ode.ContactSetGeom(contact, collisions[1])
-- create the joint
local joint = ode.JointCreateContact(
self.world,
self.contactgroup,
contact
)
-- attach the two bodies
local bodyA = ode.GeomGetData(a)
local bodyB = ode.GeomGetData(b)
ode.JointAttach(joint, bodyA, bodyB)
end
end)
-- update the world
ode.WorldQuickStep(self.world, interval)
-- remove all contact joints
ode.JointGroupEmpty(self.contactGroup)
-- update entity transforms
for id, physics in pairs(query) do
local x,y,z = ode.BodyGetPosition(physics._body)
local d,a,b,c = ode.BodyGetQuaternion(physics._body)
entity.transform
:identity()
:translate(Vec3{x,y,z})
:mul(Quaternion{a,b,c,d}:toMat4())
end
end
end,
}
end
return module
|
