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
|
#pragma BLENDER_REQUIRE(common_hair_lib.glsl)
#pragma BLENDER_REQUIRE(common_view_lib.glsl)
#pragma BLENDER_REQUIRE(common_view_clipping_lib.glsl)
#pragma BLENDER_REQUIRE(workbench_common_lib.glsl)
#pragma BLENDER_REQUIRE(workbench_material_lib.glsl)
#pragma BLENDER_REQUIRE(workbench_image_lib.glsl)
/* From http://libnoise.sourceforge.net/noisegen/index.html */
float integer_noise(int n)
{
n = (n >> 13) ^ n;
int nn = (n * (n * n * 60493 + 19990303) + 1376312589) & 0x7fffffff;
return (float(nn) / 1073741824.0);
}
vec3 workbench_hair_random_normal(vec3 tan, vec3 binor, float rand)
{
/* To "simulate" anisotropic shading, randomize hair normal per strand. */
vec3 nor = cross(tan, binor);
nor = normalize(mix(nor, -tan, rand * 0.1));
float cos_theta = (rand * 2.0 - 1.0) * 0.2;
float sin_theta = sqrt(max(0.0, 1.0 - cos_theta * cos_theta));
nor = nor * sin_theta + binor * cos_theta;
return nor;
}
void workbench_hair_random_material(float rand,
inout vec3 color,
inout float roughness,
inout float metallic)
{
/* Center noise around 0. */
rand -= 0.5;
rand *= 0.1;
/* Add some variation to the hairs to avoid uniform look. */
metallic = clamp(metallic + rand, 0.0, 1.0);
roughness = clamp(roughness + rand, 0.0, 1.0);
/* Modulate by color intensity to reduce very high contrast when color is dark. */
color = clamp(color + rand * (color + 0.05), 0.0, 1.0);
}
void main()
{
bool is_persp = (ProjectionMatrix[3][3] == 0.0);
float time, thick_time, thickness;
vec3 world_pos, tan, binor;
hair_get_pos_tan_binor_time(is_persp,
ModelMatrixInverse,
ViewMatrixInverse[3].xyz,
ViewMatrixInverse[2].xyz,
world_pos,
tan,
binor,
time,
thickness,
thick_time);
gl_Position = point_world_to_ndc(world_pos);
float hair_rand = integer_noise(hair_get_strand_id());
vec3 nor = workbench_hair_random_normal(tan, binor, hair_rand);
view_clipping_distances(world_pos);
uv_interp = hair_get_customdata_vec2(au);
normal_interp = normalize(normal_world_to_view(nor));
workbench_material_data_get(resource_handle, color_interp, alpha_interp, roughness, metallic);
if (materialIndex == 0) {
color_interp = hair_get_customdata_vec3(ac);
}
/* Hairs have lots of layer and can rapidly become the most prominent surface.
* So we lower their alpha artificially. */
alpha_interp *= 0.3;
workbench_hair_random_material(hair_rand, color_interp, roughness, metallic);
object_id = int(uint(resource_handle) & 0xFFFFu) + 1;
}
|
