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
|
#version 150
// Node parameter inputs
uniform sampler2D tex_in;
uniform vec4 color_in;
uniform float radius_in;
uniform float opacity_in;
uniform bool inner_in;
// Standard inputs
uniform vec2 ove_resolution;
uniform int ove_iteration;
in vec2 ove_texcoord;
out vec4 fragColor;
void main(void) {
vec4 pixel_here = texture(tex_in, ove_texcoord);
// Detect no-op situations
if (radius_in == 0.0
|| opacity_in == 0.0
|| (inner_in && pixel_here.a == 0.0)
|| (!inner_in && pixel_here.a == 1.0)) {
// No-op, do nothing
fragColor = pixel_here;
return;
}
float radius = ceil(radius_in);
float stroke_weight = 0.0;
// Loop over box
for (float i=-radius + 0.5; i<=radius; i += 2.0) {
float x_coord = i / ove_resolution.x;
for (float j=-radius + 0.5; j<=radius; j += 2.0) {
float y_coord = j / ove_resolution.y;
if (abs(length(vec2(i, j))) < radius) {
// Get pixel here
float alpha = texture(tex_in, ove_texcoord + vec2(x_coord, y_coord)).a;
if (inner_in) {
alpha = 1.0 - alpha;
}
stroke_weight += alpha;
if (stroke_weight >= 1.0) {
break;
}
}
}
if (stroke_weight >= 1.0) {
stroke_weight = 1.0;
break;
}
}
stroke_weight *= opacity_in;
if (inner_in) {
stroke_weight *= pixel_here.a;
}
// Make RGBA color
vec4 stroke_col = color_in * stroke_weight;
if (inner_in) {
// Alpha over the stroke over the texture
stroke_col = pixel_here * (1.0 - stroke_col.a) + stroke_col;
} else {
// Alpha over the texture over the stroke
stroke_col = stroke_col * (1.0 - pixel_here.a) + pixel_here;
}
fragColor = stroke_col;
}
|
