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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
// NOTE: DO NOT CHANGE THIS FILE. IT IS AUTOMATICALLY GENERATED.
#include <mbgl/shaders/symbol_sdf.hpp>
namespace mbgl {
namespace shaders {
const char* symbol_sdf::name = "symbol_sdf";
const char* symbol_sdf::vertexSource = R"MBGL_SHADER(
const float PI = 3.141592653589793;
attribute vec4 a_pos_offset;
attribute vec2 a_texture_pos;
attribute vec4 a_data;
uniform lowp float a_fill_color_t;
attribute lowp vec4 a_fill_color;
varying lowp vec4 fill_color;
uniform lowp float a_halo_color_t;
attribute lowp vec4 a_halo_color;
varying lowp vec4 halo_color;
uniform lowp float a_opacity_t;
attribute lowp vec2 a_opacity;
varying lowp float opacity;
uniform lowp float a_halo_width_t;
attribute lowp vec2 a_halo_width;
varying lowp float halo_width;
uniform lowp float a_halo_blur_t;
attribute lowp vec2 a_halo_blur;
varying lowp float halo_blur;
// matrix is for the vertex position.
uniform mat4 u_matrix;
uniform mediump float u_zoom;
uniform bool u_rotate_with_map;
uniform bool u_pitch_with_map;
uniform mediump float u_pitch;
uniform mediump float u_bearing;
uniform mediump float u_aspect_ratio;
uniform vec2 u_extrude_scale;
uniform vec2 u_texsize;
varying vec2 v_tex;
varying vec2 v_fade_tex;
varying float v_gamma_scale;
void main() {
fill_color = unpack_mix_vec4(a_fill_color, a_fill_color_t);
halo_color = unpack_mix_vec4(a_halo_color, a_halo_color_t);
opacity = unpack_mix_vec2(a_opacity, a_opacity_t);
halo_width = unpack_mix_vec2(a_halo_width, a_halo_width_t);
halo_blur = unpack_mix_vec2(a_halo_blur, a_halo_blur_t);
vec2 a_pos = a_pos_offset.xy;
vec2 a_offset = a_pos_offset.zw;
vec2 a_tex = a_texture_pos.xy;
mediump float a_labelminzoom = a_data[0];
mediump vec2 a_zoom = a_data.pq;
mediump float a_minzoom = a_zoom[0];
mediump float a_maxzoom = a_zoom[1];
// u_zoom is the current zoom level adjusted for the change in font size
mediump float z = 2.0 - step(a_minzoom, u_zoom) - (1.0 - step(a_maxzoom, u_zoom));
// pitch-alignment: map
// rotation-alignment: map | viewport
if (u_pitch_with_map) {
lowp float angle = u_rotate_with_map ? (a_data[1] / 256.0 * 2.0 * PI) : u_bearing;
lowp float asin = sin(angle);
lowp float acos = cos(angle);
mat2 RotationMatrix = mat2(acos, asin, -1.0 * asin, acos);
vec2 offset = RotationMatrix * a_offset;
vec2 extrude = u_extrude_scale * (offset / 64.0);
gl_Position = u_matrix * vec4(a_pos + extrude, 0, 1);
gl_Position.z += z * gl_Position.w;
// pitch-alignment: viewport
// rotation-alignment: map
} else if (u_rotate_with_map) {
// foreshortening factor to apply on pitched maps
// as a label goes from horizontal <=> vertical in angle
// it goes from 0% foreshortening to up to around 70% foreshortening
lowp float pitchfactor = 1.0 - cos(u_pitch * sin(u_pitch * 0.75));
lowp float lineangle = a_data[1] / 256.0 * 2.0 * PI;
// use the lineangle to position points a,b along the line
// project the points and calculate the label angle in projected space
// this calculation allows labels to be rendered unskewed on pitched maps
vec4 a = u_matrix * vec4(a_pos, 0, 1);
vec4 b = u_matrix * vec4(a_pos + vec2(cos(lineangle),sin(lineangle)), 0, 1);
lowp float angle = atan((b[1]/b[3] - a[1]/a[3])/u_aspect_ratio, b[0]/b[3] - a[0]/a[3]);
lowp float asin = sin(angle);
lowp float acos = cos(angle);
mat2 RotationMatrix = mat2(acos, -1.0 * asin, asin, acos);
vec2 offset = RotationMatrix * (vec2((1.0-pitchfactor)+(pitchfactor*cos(angle*2.0)), 1.0) * a_offset);
vec2 extrude = u_extrude_scale * (offset / 64.0);
gl_Position = u_matrix * vec4(a_pos, 0, 1) + vec4(extrude, 0, 0);
gl_Position.z += z * gl_Position.w;
// pitch-alignment: viewport
// rotation-alignment: viewport
} else {
vec2 extrude = u_extrude_scale * (a_offset / 64.0);
gl_Position = u_matrix * vec4(a_pos, 0, 1) + vec4(extrude, 0, 0);
}
v_gamma_scale = gl_Position.w;
v_tex = a_tex / u_texsize;
v_fade_tex = vec2(a_labelminzoom / 255.0, 0.0);
}
)MBGL_SHADER";
const char* symbol_sdf::fragmentSource = R"MBGL_SHADER(
#define SDF_PX 8.0
#define EDGE_GAMMA 0.105/DEVICE_PIXEL_RATIO
uniform bool u_is_halo;
varying lowp vec4 fill_color;
varying lowp vec4 halo_color;
varying lowp float opacity;
varying lowp float halo_width;
varying lowp float halo_blur;
uniform sampler2D u_texture;
uniform sampler2D u_fadetexture;
uniform lowp float u_font_scale;
uniform highp float u_gamma_scale;
varying vec2 v_tex;
varying vec2 v_fade_tex;
varying float v_gamma_scale;
void main() {
lowp vec4 color = fill_color;
lowp float gamma = EDGE_GAMMA / u_gamma_scale;
lowp float buff = (256.0 - 64.0) / 256.0;
if (u_is_halo) {
color = halo_color;
gamma = (halo_blur * 1.19 / SDF_PX + EDGE_GAMMA) / u_gamma_scale;
buff = (6.0 - halo_width / u_font_scale) / SDF_PX;
}
lowp float dist = texture2D(u_texture, v_tex).a;
lowp float fade_alpha = texture2D(u_fadetexture, v_fade_tex).a;
highp float gamma_scaled = gamma * v_gamma_scale;
highp float alpha = smoothstep(buff - gamma_scaled, buff + gamma_scaled, dist) * fade_alpha;
gl_FragColor = color * (alpha * opacity);
#ifdef OVERDRAW_INSPECTOR
gl_FragColor = vec4(1.0);
#endif
}
)MBGL_SHADER";
} // namespace shaders
} // namespace mbgl
|
