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/*
* 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 mediump float;
uniform sampler2D m_sampY;
uniform sampler2D m_sampU;
uniform sampler2D m_sampV;
varying vec2 m_cordY;
varying vec2 m_cordU;
varying vec2 m_cordV;
uniform vec2 m_step;
uniform mat4 m_yuvmat;
uniform float m_stretch;
uniform float m_alpha;
void main()
{
vec4 rgb;
#if defined(XBMC_YV12) || defined(XBMC_NV12)
vec4 yuv;
yuv.rgba = vec4( texture2D(m_sampY, m_cordY).r
, texture2D(m_sampU, m_cordU).g
, texture2D(m_sampV, m_cordV).a
, 1.0 );
rgb = m_yuvmat * yuv;
rgb.a = m_alpha;
#elif defined(XBMC_NV12_RRG)
vec4 yuv;
yuv.rgba = vec4( texture2D(m_sampY, stretch(m_cordY)).r
, texture2D(m_sampU, stretch(m_cordU)).r
, texture2D(m_sampV, stretch(m_cordV)).g
, 1.0 );
rgb = m_yuvmat * yuv;
rgb.a = m_alpha;
#elif defined(XBMC_YUY2) || defined(XBMC_UYVY)
vec2 stepxy = m_step;
vec2 pos = m_cordY;
pos = vec2(pos.x - stepxy.x * 0.25, pos.y);
vec2 f = fract(pos / stepxy);
//y axis will be correctly interpolated by opengl
//x axis will not, so we grab two pixels at the center of two columns and interpolate ourselves
vec4 c1 = texture2D(m_sampY, vec2(pos.x + (0.5 - f.x) * stepxy.x, pos.y));
vec4 c2 = texture2D(m_sampY, vec2(pos.x + (1.5 - f.x) * stepxy.x, pos.y));
/* each pixel has two Y subpixels and one UV subpixel
YUV Y YUV
check if we're left or right of the middle Y subpixel and interpolate accordingly*/
#ifdef XBMC_YUY2 //BGRA = YUYV
float leftY = mix(c1.b, c1.r, f.x * 2.0);
float rightY = mix(c1.r, c2.b, f.x * 2.0 - 1.0);
vec2 outUV = mix(c1.ga, c2.ga, f.x);
#else //BGRA = UYVY
float leftY = mix(c1.g, c1.a, f.x * 2.0);
float rightY = mix(c1.a, c2.g, f.x * 2.0 - 1.0);
vec2 outUV = mix(c1.br, c2.br, f.x);
#endif //XBMC_YUY2
float outY = mix(leftY, rightY, step(0.5, f.x));
vec4 yuv = vec4(outY, outUV, 1.0);
rgb = m_yuvmat * yuv;
rgb.a = m_alpha;
#endif
gl_FragColor = rgb;
}
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