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
|
// -*- mode: c -*-
struct Material {
vec3 baseColorFactor;
bool baseColorTextureEnabled;
int baseColorTexcoord;
float metallicFactor;
float roughnessFactor;
vec3 normalFactor;
bool normalTextureEnabled;
int normalTexcoord;
vec3 occlusionFactor;
bool occlusionTextureEnabled;
int occlusionTexcoord;
vec3 emissiveFactor;
bool emissiveTextureEnabled;
int emissiveTexcoord;
int alphaMode;
float alphaCutoff;
};
#ifdef GLSL120
attribute vec2 fragTexcoord0;
attribute vec2 fragTexcoord1
attribute vec4 fragColor0;
#else
in vec2 fragTexcoord0;
in vec2 fragTexcoord1;
in vec4 fragColor0;
#endif
#ifdef GLSL330
out vec4 fragColor;
#endif
uniform Material material;
uniform bool vertexColored;
uniform sampler2D baseColorTexture;
uniform sampler2D normalTexture;
uniform sampler2D occlusionTexture;
uniform sampler2D emissiveTexture;
vec4 sampleTexture(sampler2D tex, bool enabled, int texcoord, vec3 factor, vec4 defaultColor) {
if(enabled && texcoord == 0) {
return texture(tex, fragTexcoord0) * vec4(factor, 1.0);
} else if(enabled && texcoord == 1) {
return texture(tex, fragTexcoord1) * vec4(factor, 1.0);
} else {
return defaultColor;
}
}
vec4 applyAlpha(vec4 color) {
// Apply alpha mode.
if(material.alphaMode == 0) { // opaque
return vec4(color.xyz, 1.0);
} else if(material.alphaMode == 1) { // mask
if(color.a >= material.alphaCutoff) {
return vec4(color.xyz, 1.0);
} else {
discard;
}
} else if(material.alphaMode == 2) { // blend
if(color.a <= 0.005) {
discard;
} else {
return color;
}
}
}
void main(void) {
vec4 finalColor = sampleTexture(baseColorTexture,
material.baseColorTextureEnabled,
material.baseColorTexcoord,
material.baseColorFactor,
vec4(0.0, 0.0, 1.0, 1.0));
// Mix in vertex color, if present.
if(vertexColored) {
finalColor *= fragColor0;
}
// TODO: Actually apply PBR calculations.
finalColor += sampleTexture(normalTexture,
material.normalTextureEnabled,
material.normalTexcoord,
material.normalFactor,
vec4(0.0, 0.0, 0.0, 0.0)) * 0.1;
finalColor += sampleTexture(occlusionTexture,
material.occlusionTextureEnabled,
material.occlusionTexcoord,
material.occlusionFactor,
vec4(0.0, 0.0, 0.0, 0.0)) * 0.1;
finalColor += sampleTexture(emissiveTexture,
material.emissiveTextureEnabled,
material.emissiveTexcoord,
material.emissiveFactor,
vec4(0.0, 0.0, 0.0, 0.0));
finalColor = applyAlpha(finalColor);
#ifdef GLSL330
fragColor = finalColor;
#else
gl_FragColor = finalColor;
#endif
}
|
