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
|
require 'honey.std'
local glfw = honey.glfw
local gl = honey.gl
local Vec3 = honey.Vec3
local Mat4 = honey.Mat4
local ecs = honey.ecs
-- camera matrices
local camera = {
view=Mat4.Identity(),
projection=Mat4(),
}
camera.view:translate(Vec3{0, 0, -60})
camera.projection:perspective(math.rad(45), 640/480, 0.1, 100)
function recursiveComputeTransform(entity)
if entity._transformComputed then
return entity._transform
end
if entity.parent == false then
entity._transformComputed = true
entity._transform = entity.transform
return entity.transform
end
entity._transformComputed = true
local parentTransform = recursiveComputeTransform(entity.parent)
entity._transform = parentTransform * entity.transform
return entity._transform
end
local world = ecs.World()
-- update transforms
world:addSystem{
filter=ecs.Filter.AND{"transform", "parent"},
update=function(entity, dt)
recursiveComputeTransform(entity)
end,
priority=1,
}
world:addSystem{
filter=ecs.Filter.AND{"transform", "parent"},
update=function(entity, dt)
entity._transform = nil
entity._transformComputed = false
end,
priority=0,
}
-- render objects
world:addSystem{
filter=ecs.Filter.AND{"mesh", "shader", "transform"},
update=function(entity, dt)
entity.shader:use()
entity.shader:configure{
matrix={
model=entity._transform,
view=camera.view,
projection=camera.projection,
},
}
entity.mesh:drawElements()
end,
priority=99,
}
local window = honey.init()
gl.Enable(gl.DEPTH_TEST)
local vertexShaderSource = [[
#version 410 core
layout (location = 0) in vec3 in_position;
layout (location = 1) in vec3 in_normal;
layout (location = 2) in vec2 in_tex;
uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;
out vec3 position;
out vec3 normal;
out vec2 tex;
void main()
{
gl_Position = projection * view * model * vec4(in_position, 1.0);
position = in_position;
//normal = vec3(model * vec4(in_normal, 1.0f));
normal = in_normal;
tex = in_tex;
}
]]
local fragmentShaderSource = [[
#version 410 core
out vec4 FragColor;
in vec3 position;
in vec3 normal;
in vec2 tex;
uniform sampler2D ourTexture;
void main()
{
FragColor = vec4(normal, 1.0f);
//FragColor = vec4(tex, 1.0f, 1.0f);
//FragColor = texture(ourTexture, TexCoord);
}
]]
local shader = honey.Shader{
vertex = vertexShaderSource,
fragment = fragmentShaderSource,
}
local tetra = honey.mesh.loadFile("assets/tetrahedron.obj")[1]
local cube = honey.mesh.loadFile("assets/cube.obj")[1]
local octa = honey.mesh.loadFile("assets/octahedron.obj")[1]
local dodeca = honey.mesh.loadFile("assets/dodecahedron.obj")[1]
local icosa = honey.mesh.loadFile("assets/icosahedron.obj")[1]
function growLine(prev, depth)
if depth == 0 then return prev end
local entity = {
transform=Mat4.Identity(),
mesh=octa,
shader=shader,
}
entity.transform:translate(Vec3{2, 0, 0})
prev.parent = entity
world:addEntity(prev)
return growLine(entity, depth-1)
end
local leaf = {
transform=Mat4.Identity(),
mesh=tetra,
shader=shader,
}
local root = growLine(leaf, 24)
root.parent = false
world:addEntity(root)
function updateTransforms(dt)
local entity = leaf
while entity ~= false do
entity.transform:rotateY(0.3 * math.pi * dt)
entity.transform:rotateX(0.1 * math.pi * dt)
entity = entity.parent
end
end
window:setKeyCallback(function(_, key)
if key == glfw.KEY_ESCAPE then
window:setShouldClose(true)
end
end)
local prevTime = 0
while not window:shouldClose() do
local time = glfw.GetTime()
local dt = time - prevTime
prevTime = time
updateTransforms(dt)
gl.ClearColor(0.2, 0.4, 1.0, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT + gl.DEPTH_BUFFER_BIT)
world:update(dt)
window:swapBuffers()
glfw.PollEvents()
end
honey.terminate()
|
