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
|
// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED.
#include <mbgl/shaders/circle.hpp>
namespace mbgl {
namespace shaders {
const char* circle::name = "circle";
const char* circle::vertexSource = R"MBGL_SHADER(
uniform mat4 u_matrix;
uniform bool u_scale_with_map;
uniform vec2 u_extrude_scale;
attribute vec2 a_pos;
uniform lowp float a_color_t;
attribute lowp vec4 a_color;
varying lowp vec4 color;
uniform lowp float a_radius_t;
attribute mediump vec2 a_radius;
varying mediump float radius;
uniform lowp float a_blur_t;
attribute lowp vec2 a_blur;
varying lowp float blur;
uniform lowp float a_opacity_t;
attribute lowp vec2 a_opacity;
varying lowp float opacity;
uniform lowp float a_stroke_color_t;
attribute lowp vec4 a_stroke_color;
varying lowp vec4 stroke_color;
uniform lowp float a_stroke_width_t;
attribute mediump vec2 a_stroke_width;
varying mediump float stroke_width;
uniform lowp float a_stroke_opacity_t;
attribute lowp vec2 a_stroke_opacity;
varying lowp float stroke_opacity;
varying vec2 v_extrude;
varying lowp float v_antialiasblur;
void main(void) {
color = unpack_mix_vec4(a_color, a_color_t);
radius = unpack_mix_vec2(a_radius, a_radius_t);
blur = unpack_mix_vec2(a_blur, a_blur_t);
opacity = unpack_mix_vec2(a_opacity, a_opacity_t);
stroke_color = unpack_mix_vec4(a_stroke_color, a_stroke_color_t);
stroke_width = unpack_mix_vec2(a_stroke_width, a_stroke_width_t);
stroke_opacity = unpack_mix_vec2(a_stroke_opacity, a_stroke_opacity_t);
// unencode the extrusion vector that we snuck into the a_pos vector
v_extrude = vec2(mod(a_pos, 2.0) * 2.0 - 1.0);
vec2 extrude = v_extrude * (radius + stroke_width) * u_extrude_scale;
// multiply a_pos by 0.5, since we had it * 2 in order to sneak
// in extrusion data
gl_Position = u_matrix * vec4(floor(a_pos * 0.5), 0, 1);
if (u_scale_with_map) {
gl_Position.xy += extrude;
} else {
gl_Position.xy += extrude * gl_Position.w;
}
// This is a minimum blur distance that serves as a faux-antialiasing for
// the circle. since blur is a ratio of the circle's size and the intent is
// to keep the blur at roughly 1px, the two are inversely related.
v_antialiasblur = 1.0 / DEVICE_PIXEL_RATIO / (radius + stroke_width);
}
)MBGL_SHADER";
const char* circle::fragmentSource = R"MBGL_SHADER(
varying lowp vec4 color;
varying mediump float radius;
varying lowp float blur;
varying lowp float opacity;
varying lowp vec4 stroke_color;
varying mediump float stroke_width;
varying lowp float stroke_opacity;
varying vec2 v_extrude;
varying lowp float v_antialiasblur;
void main() {
float extrude_length = length(v_extrude);
float antialiased_blur = -max(blur, v_antialiasblur);
float opacity_t = smoothstep(0.0, antialiased_blur, extrude_length - 1.0);
float color_t = stroke_width < 0.01 ? 0.0 : smoothstep(
antialiased_blur,
0.0,
extrude_length - radius / (radius + stroke_width)
);
gl_FragColor = opacity_t * mix(color * opacity, stroke_color * stroke_opacity, color_t);
#ifdef OVERDRAW_INSPECTOR
gl_FragColor = vec4(1.0);
#endif
}
)MBGL_SHADER";
} // namespace shaders
} // namespace mbgl
|
