forked from g3n/engine
/
material_pbr.go
135 lines (117 loc) · 2.8 KB
/
material_pbr.go
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
package gltf
import (
"fmt"
"github.com/g3n/engine/material"
"github.com/g3n/engine/math32"
)
func (g *GLTF) loadMaterialPBR(m *Material) (material.IMaterial, error) {
// Get pbr information
pbr := m.PbrMetallicRoughness
if pbr == nil {
return nil, fmt.Errorf("PbrMetallicRoughness not supplied")
}
// Create new physically based material
pm := material.NewPhysical()
// Double sided
if m.DoubleSided {
pm.SetSide(material.SideDouble)
} else {
pm.SetSide(material.SideFront)
}
var alphaMode string
if len(m.AlphaMode) > 0{
alphaMode = m.AlphaMode
} else {
alphaMode = "OPAQUE"
}
if alphaMode == "BLEND" {
pm.SetTransparent(true)
} else {
pm.SetTransparent(false)
if alphaMode == "MASK" {
// TODO m.AlphaCutoff
// pm.SetAlphaCutoff
}
}
// BaseColorFactor
var baseColorFactor math32.Color4
if pbr.BaseColorFactor != nil {
baseColorFactor = math32.Color4{pbr.BaseColorFactor[0], pbr.BaseColorFactor[1], pbr.BaseColorFactor[2], pbr.BaseColorFactor[3]}
} else {
baseColorFactor = math32.Color4{1,1,1,1}
}
pm.SetBaseColorFactor(&baseColorFactor)
// MetallicFactor
var metallicFactor float32
if pbr.MetallicFactor != nil {
metallicFactor = *pbr.MetallicFactor
} else {
if pbr.MetallicRoughnessTexture != nil {
metallicFactor = 1
} else {
metallicFactor = 0
}
}
pm.SetMetallicFactor(metallicFactor)
// RoughnessFactor
var roughnessFactor float32
if pbr.RoughnessFactor != nil {
roughnessFactor = *pbr.RoughnessFactor
} else {
roughnessFactor = 1
}
pm.SetRoughnessFactor(roughnessFactor)
// EmissiveFactor
var emissiveFactor math32.Color
if m.EmissiveFactor != nil {
emissiveFactor = math32.Color{m.EmissiveFactor[0], m.EmissiveFactor[1], m.EmissiveFactor[2]}
} else {
if m.EmissiveTexture != nil {
emissiveFactor = math32.Color{1, 1, 1}
} else {
emissiveFactor = math32.Color{0,0,0}
}
}
pm.SetEmissiveFactor(&emissiveFactor)
// BaseColorTexture
if pbr.BaseColorTexture != nil {
tex, err := g.LoadTexture(pbr.BaseColorTexture.Index)
if err != nil {
return nil, err
}
pm.SetBaseColorMap(tex)
}
// MetallicRoughnessTexture
if pbr.MetallicRoughnessTexture != nil {
tex, err := g.LoadTexture(pbr.MetallicRoughnessTexture.Index)
if err != nil {
return nil, err
}
pm.SetMetallicRoughnessMap(tex)
}
// NormalTexture
if m.NormalTexture != nil {
tex, err := g.LoadTexture(m.NormalTexture.Index)
if err != nil {
return nil, err
}
pm.SetNormalMap(tex)
}
// OcclusionTexture
if m.OcclusionTexture != nil {
tex, err := g.LoadTexture(m.OcclusionTexture.Index)
if err != nil {
return nil, err
}
pm.SetOcclusionMap(tex)
}
// EmissiveTexture
if m.EmissiveTexture != nil {
tex, err := g.LoadTexture(m.EmissiveTexture.Index)
if err != nil {
return nil, err
}
pm.SetEmissiveMap(tex)
}
return pm, nil
}