1 files changed, 20 insertions, 2 deletions
diff --git a/system/shaders/output.glsl b/system/shaders/output.glsl
index 53c89935ae..83f77b04c0 100644
--- a/system/shaders/output.glsl
+++ b/system/shaders/output.glsl
@@ -1,6 +1,24 @@
+#if (XBMC_DITHER)
+uniform sampler2D m_dither;
+uniform float     m_ditherquant;
+uniform vec2      m_dithersize;
+#endif
+
 void main()
 {
-  vec4 rgb = process();
+  vec4 rgb        = process();
+
+#if (XBMC_FULLRANGE)
+  rgb             = clamp((rgb-(16.0/255.0)) * 255.0/219.0, 0, 1);
+#endif
+
+#if (XBMC_DITHER)
+  vec2 ditherpos  = gl_FragCoord.xy / m_dithersize;
+  // ditherval is multiplied by 65536/(dither_size^2) to make it [0,1[
+  // FIXME: scale dither values before uploading?
+  float ditherval = texture2D(m_dither, ditherpos).r * 16.0;
+  rgb             = floor(rgb * m_ditherquant + ditherval) / m_ditherquant;
+#endif
 
-  gl_FragColor = rgb;
+  gl_FragColor    = rgb;
 }