1 files changed, 38 insertions, 0 deletions
diff --git a/src/graphics/shaders/rgb2yuv.frag b/src/graphics/shaders/rgb2yuv.frag
new file mode 100644
index 0000000..351d3b2
--- /dev/null
+++ b/src/graphics/shaders/rgb2yuv.frag
@@ -0,0 +1,38 @@
+//
+//  libavg - Media Playback Engine. 
+//  Copyright (C) 2003-2011 Ulrich von Zadow
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2 of the License, or (at your option) any later version.
+//
+//  This library 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
+//  Lesser General Public License for more details.
+//
+//  You should have received a copy of the GNU Lesser General Public
+//  License along with this library; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+//  Current versions can be found at www.libavg.de
+//
+
+uniform sampler2D u_Texture;
+
+#ifndef FRAGMENT_ONLY
+varying vec2 v_TexCoord;
+varying vec4 v_Color;
+#endif
+
+void main(void)
+{
+    // Uses jpeg coefficients.
+    vec4 tex = texture2D(u_Texture, v_TexCoord);
+    float y =  0.299*tex.r + 0.587*tex.g + 0.114*tex.b;
+    float u = -0.168*tex.r - 0.330*tex.g + 0.498*tex.b + 0.5;
+    float v =  0.498*tex.r - 0.417*tex.g - 0.081*tex.b + 0.5;
+    gl_FragColor = vec4(v,u,y,1);
+}
+