9 * Copyright (C) 2007 David A. Schleef <ds@schleef.org>
10 * Copyright (C) 2008 Julien Isorce <julien.isorce@gmail.com>
11 * Copyright (C) 2008 Filippo Argiolas <filippo.argiolas@gmail.com>
13 * This library is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU Library General Public
15 * License as published by the Free Software Foundation; either
16 * version 2 of the License, or (at your option) any later version.
18 * This library is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * Library General Public License for more details.
23 * You should have received a copy of the GNU Library General Public
24 * License along with this library; if not, write to the
25 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
26 * Boston, MA 02111-1307, USA.
29 #extension GL_ARB_texture_rectangle : enable
30 uniform sampler2DRect tex;
33 float r,g,b,r2,b2,g2,y,u,v;
34 vec2 nxy=gl_TexCoord[0].xy;
35 vec2 nxy2=mod(2.0*nxy, vec2(w, h));
36 r=texture2DRect(tex,nxy).r;
37 g=texture2DRect(tex,nxy).g;
38 b=texture2DRect(tex,nxy).b;
39 r2=texture2DRect(tex,nxy2).r;
40 g2=texture2DRect(tex,nxy2).g;
41 b2=texture2DRect(tex,nxy2).b;
42 y=0.299011*r + 0.586987*g + 0.114001*b;
43 u=-0.148246*r2 -0.29102*g2 + 0.439266*b2;
44 v=0.439271*r2 - 0.367833*g2 - 0.071438*b2 ;
45 y=0.858885*y + 0.0625;
48 gl_FragData[0] = vec4(y, 0.0, 0.0, 1.0);
49 gl_FragData[1] = vec4(u, 0.0, 0.0, 1.0);
50 gl_FragData[2] = vec4(v, 0.0, 0.0, 1.0);