added: YUY2 to rgb conversion with shaders

removed: double upload for YUY2

git-svn-id: https://xbmc.svn.sourceforge.net/svnroot/xbmc/trunk@31688 568bbfeb-2a22-0410-94d2-cc84cf5bfa90

1 files changed, 39 insertions, 0 deletions

diff --git a/system/shaders/yuv2rgb_basic.glsl b/system/shaders/yuv2rgb_basic.glsl
index 0cbd1f8c74..31f07ee3db 100644
--- a/system/shaders/yuv2rgb_basic.glsl
+++ b/system/shaders/yuv2rgb_basic.glsl
@@ -11,6 +11,8 @@ varying vec2      m_cordY;
 varying vec2      m_cordU;
 varying vec2      m_cordV;
 
+uniform vec2      m_step;
+
 uniform mat4      m_yuvmat;
 
 uniform float     m_stretch;
@@ -30,6 +32,8 @@ vec2 stretch(vec2 pos)
 
 void main()
 {
+#ifndef XBMC_YUY2
+
   vec4 yuv, rgb;
   yuv.rgba = vec4( texture2D(m_sampY, stretch(m_cordY)).r
                  , texture2D(m_sampU, stretch(m_cordU)).g
@@ -39,4 +43,39 @@ void main()
   rgb   = m_yuvmat * yuv;
   rgb.a = gl_Color.a;
   gl_FragColor = rgb;
+
+#else
+
+#if(XBMC_texture_rectangle)
+  vec2 stepxy = vec2(1.0, 1.0);
+  vec2 pos    = stretch(vec2(m_cordY.x * 0.5 - 0.25, m_cordY.y));
+  vec2 f      = fract(pos);
+#else
+  vec2 stepxy = vec2(m_step.x * 2.0, m_step.y);
+  vec2 pos    = stretch(vec2(m_cordY.x - stepxy.x * 0.25, m_cordY.y));
+  vec2 f      = fract(pos / stepxy);
+#endif
+
+  //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 + ( 0.5 - 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*/
+  float leftY   = mix(c1.b, c1.r, f.x * 2.0);
+  float rightY  = mix(c1.r, c2.b, f.x * 2.0 - 1.0);
+  float outY    = mix(leftY, rightY, step(0.5, f.x));
+
+  //interpolate UV
+  vec2  outUV   = mix(c1.ga, c2.ga, f.x);
+
+  vec4  yuv     = vec4(outY, outUV, 1.0);
+  vec4  rgb     = m_yuvmat * yuv;
+
+  gl_FragColor   = rgb;
+  gl_FragColor.a = gl_Color.a;
+
+#endif
 }