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
|
/*
* Copyright (C) 2010-2013 Team XBMC
* http://xbmc.org
*
* This Program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This Program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with XBMC; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#version 100
precision highp float;
uniform sampler2D img;
uniform vec2 stepxy;
varying vec2 cord;
uniform float m_alpha;
uniform sampler2D kernelTex;
vec4 weight(float pos)
{
#if defined(HAS_FLOAT_TEXTURE)
return texture2D(kernelTex, vec2(pos, 0.5));
#else
return texture2D(kernelTex, vec2(pos - 0.5)) * 2.0 - 1.0;
#endif
}
vec3 pixel(float xpos, float ypos)
{
return texture2D(img, vec2(xpos, ypos)).rgb;
}
vec3 line (float ypos, vec4 xpos, vec4 linetaps)
{
return pixel(xpos.r, ypos) * linetaps.r +
pixel(xpos.g, ypos) * linetaps.g +
pixel(xpos.b, ypos) * linetaps.b +
pixel(xpos.a, ypos) * linetaps.a;
}
void main()
{
vec4 rgb;
vec2 pos = cord + stepxy * 0.5;
vec2 f = fract(pos / stepxy);
vec4 linetaps = weight(1.0 - f.x);
vec4 columntaps = weight(1.0 - f.y);
// make sure all taps added together is exactly 1.0, otherwise some (very small) distortion can occur
linetaps /= linetaps.r + linetaps.g + linetaps.b + linetaps.a;
columntaps /= columntaps.r + columntaps.g + columntaps.b + columntaps.a;
vec2 xystart = (-1.5 - f) * stepxy + pos;
vec4 xpos = vec4(xystart.x, xystart.x + stepxy.x, xystart.x + stepxy.x * 2.0, xystart.x + stepxy.x * 3.0);
rgb.rgb = line(xystart.y, xpos, linetaps) * columntaps.r +
line(xystart.y + stepxy.y, xpos, linetaps) * columntaps.g +
line(xystart.y + stepxy.y * 2.0, xpos, linetaps) * columntaps.b +
line(xystart.y + stepxy.y * 3.0, xpos, linetaps) * columntaps.a;
rgb.a = m_alpha;
gl_FragColor = rgb;
}
|
