blob: efa35adf7d537a97c5eed08e59502ddd67cc2710 (
plain)
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
|
/* clang-format off */
[vertex]
#ifdef USE_GLES_OVER_GL
#define mediump
#define highp
#else
precision highp float;
precision highp int;
#endif
attribute highp vec2 vertex; // attrib:0
/* clang-format on */
uniform vec2 offset;
uniform vec2 scale;
varying vec2 uv_interp;
void main() {
uv_interp = vertex.xy * 2.0 - 1.0;
vec2 v = vertex.xy * scale + offset;
gl_Position = vec4(v, 0.0, 1.0);
}
/* clang-format off */
[fragment]
#ifdef USE_GLES_OVER_GL
#define mediump
#define highp
#else
precision mediump float;
precision highp int;
#endif
uniform sampler2D source; //texunit:0
/* clang-format on */
uniform vec2 eye_center;
uniform float k1;
uniform float k2;
uniform float upscale;
uniform float aspect_ratio;
varying vec2 uv_interp;
void main() {
vec2 coords = uv_interp;
vec2 offset = coords - eye_center;
// take aspect ratio into account
offset.y /= aspect_ratio;
// distort
vec2 offset_sq = offset * offset;
float radius_sq = offset_sq.x + offset_sq.y;
float radius_s4 = radius_sq * radius_sq;
float distortion_scale = 1.0 + (k1 * radius_sq) + (k2 * radius_s4);
offset *= distortion_scale;
// reapply aspect ratio
offset.y *= aspect_ratio;
// add our eye center back in
coords = offset + eye_center;
coords /= upscale;
// and check our color
if (coords.x < -1.0 || coords.y < -1.0 || coords.x > 1.0 || coords.y > 1.0) {
gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);
} else {
coords = (coords + vec2(1.0)) / vec2(2.0);
gl_FragColor = texture2D(source, coords);
}
}
|