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
|
#pragma once
#include <string>
// makes a stencil without corners
inline const std::string FRAGBORDER1 = R"#(
precision mediump float;
varying vec4 v_color;
varying vec2 v_texcoord;
uniform vec2 topLeft;
uniform vec2 fullSize;
uniform vec2 fullSizeUntransformed;
uniform float radius;
uniform float thick;
uniform int primitiveMultisample;
uniform vec4 gradient[10];
uniform int gradientLength;
uniform float angle;
uniform float alpha;
vec4 getColorForCoord(vec2 normalizedCoord) {
if (gradientLength < 2)
return gradient[0];
float finalAng = 0.0;
if (angle > 4.71 /* 270 deg */) {
normalizedCoord[1] = 1.0 - normalizedCoord[1];
finalAng = 6.28 - angle;
} else if (angle > 3.14 /* 180 deg */) {
normalizedCoord[0] = 1.0 - normalizedCoord[0];
normalizedCoord[1] = 1.0 - normalizedCoord[1];
finalAng = angle - 3.14;
} else if (angle > 1.57 /* 90 deg */) {
normalizedCoord[0] = 1.0 - normalizedCoord[0];
finalAng = 3.14 - angle;
} else {
finalAng = angle;
}
float sine = sin(finalAng);
float progress = (normalizedCoord[1] * sine + normalizedCoord[0] * (1.0 - sine)) * float(gradientLength - 1);
int bottom = int(floor(progress));
int top = bottom + 1;
return gradient[top] * (progress - float(bottom)) + gradient[bottom] * (float(top) - progress);
}
void main() {
highp vec2 pixCoord = vec2(gl_FragCoord);
highp vec2 originalPixCoord = v_texcoord;
originalPixCoord *= fullSizeUntransformed;
float additionalAlpha = 1.0;
vec4 pixColor = vec4(1.0, 1.0, 1.0, 1.0);
bool done = false;
pixCoord -= topLeft + fullSize * 0.5;
pixCoord *= vec2(lessThan(pixCoord, vec2(0.0))) * -2.0 + 1.0;
pixCoord -= fullSize * 0.5 - radius;
if (min(pixCoord.x, pixCoord.y) > 0.0 && radius > 0.0) {
float dist = length(pixCoord);
if (dist > radius + 1.0 || dist < radius - thick - 1.0)
discard;
if (primitiveMultisample == 1 && (dist > radius - 1.0 || dist < radius - thick + 1.0)) {
float distances = 0.0;
float len = length(pixCoord + vec2(0.25, 0.25));
distances += float(len < radius && len > radius - thick);
len = length(pixCoord + vec2(0.75, 0.25));
distances += float(len < radius && len > radius - thick);
len = length(pixCoord + vec2(0.25, 0.75));
distances += float(len < radius && len > radius - thick);
len = length(pixCoord + vec2(0.75, 0.75));
distances += float(len < radius && len > radius - thick);
if (distances == 0.0)
discard;
distances /= 4.0;
additionalAlpha *= distances;
} else if (dist > radius || dist < radius - thick)
discard;
done = true;
}
// now check for other shit
if (!done) {
// distance to all straight bb borders
float distanceT = originalPixCoord[1];
float distanceB = fullSizeUntransformed[1] - originalPixCoord[1];
float distanceL = originalPixCoord[0];
float distanceR = fullSizeUntransformed[0] - originalPixCoord[0];
// get the smallest
float smallest = min(min(distanceT, distanceB), min(distanceL, distanceR));
if (smallest > thick)
discard;
}
if (pixColor[3] == 0.0)
discard;
pixColor = getColorForCoord(v_texcoord);
gl_FragColor = pixColor * alpha * additionalAlpha;
}
)#";
|
