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
|
#pragma BLENDER_REQUIRE(common_globals_lib.glsl)
#pragma BLENDER_REQUIRE(common_overlay_lib.glsl)
uniform int lineStyle;
uniform bool doSmoothWire;
uniform float alpha;
uniform float dashLength;
in float selectionFac_f;
noperspective in float edgeCoord_f;
noperspective in vec2 stipplePos_f;
flat in vec2 stippleStart_f;
layout(location = 0) out vec4 fragColor;
#define M_1_SQRTPI 0.5641895835477563 /* 1/sqrt(pi) */
/**
* We want to know how much a pixel is covered by a line.
* We replace the square pixel with acircle of the same area and try to find the intersection area.
* The area we search is the circular segment. https://en.wikipedia.org/wiki/Circular_segment
* The formula for the area uses inverse trig function and is quite complexe. Instead,
* we approximate it by using the smoothstep function and a 1.05 factor to the disc radius.
*/
#define DISC_RADIUS (M_1_SQRTPI * 1.05)
#define GRID_LINE_SMOOTH_START (0.5 - DISC_RADIUS)
#define GRID_LINE_SMOOTH_END (0.5 + DISC_RADIUS)
void main()
{
vec4 inner_color = vec4(vec3(0.0), 1.0);
vec4 outer_color = vec4(0.0);
vec2 dd = fwidth(stipplePos_f);
float line_distance = distance(stipplePos_f, stippleStart_f) / max(dd.x, dd.y);
if (lineStyle == OVERLAY_UV_LINE_STYLE_OUTLINE) {
inner_color = mix(colorWireEdit, colorEdgeSelect, selectionFac_f);
outer_color = vec4(vec3(0.0), 1.0);
}
else if (lineStyle == OVERLAY_UV_LINE_STYLE_DASH) {
if (fract(line_distance / dashLength) < 0.5) {
inner_color = mix(vec4(vec3(0.35), 1.0), colorEdgeSelect, selectionFac_f);
}
}
else if (lineStyle == OVERLAY_UV_LINE_STYLE_BLACK) {
vec4 base_color = vec4(vec3(0.0), 1.0);
inner_color = mix(base_color, colorEdgeSelect, selectionFac_f);
}
else if (lineStyle == OVERLAY_UV_LINE_STYLE_WHITE) {
vec4 base_color = vec4(1.0);
inner_color = mix(base_color, colorEdgeSelect, selectionFac_f);
}
else if (lineStyle == OVERLAY_UV_LINE_STYLE_SHADOW) {
inner_color = colorUVShadow;
}
float dist = abs(edgeCoord_f) - max(sizeEdge - 0.5, 0.0);
float dist_outer = dist - max(sizeEdge, 1.0);
float mix_w;
float mix_w_outer;
if (doSmoothWire) {
mix_w = smoothstep(GRID_LINE_SMOOTH_START, GRID_LINE_SMOOTH_END, dist);
mix_w_outer = smoothstep(GRID_LINE_SMOOTH_START, GRID_LINE_SMOOTH_END, dist_outer);
}
else {
mix_w = step(0.5, dist);
mix_w_outer = step(0.5, dist_outer);
}
vec4 final_color = mix(outer_color, inner_color, 1.0 - mix_w * outer_color.a);
final_color.a *= 1.0 - (outer_color.a > 0.0 ? mix_w_outer : mix_w);
final_color.a *= alpha;
fragColor = final_color;
}
|
