Hack: we have data from debayer -- square -- but yuv uses block of

four pixels -- YUYV.

data/yuv.frag

@@ -23,9 +23,9 @@ main()
     texture2D(texture, top_right_uv).r,
     texture2D(texture, bottom_left_uv).r,
     texture2D(texture, bottom_right_uv).r);
-    vec3 color = vec3(samples.x, samples.y, samples.z);
+    vec3 color = vec3(samples.z, samples.z, samples.z);
 
-    color *= color_matrix;
+    //color *= color_matrix;
     vec3 gamma_color = pow(color, vec3(inv_gamma));
 
     gl_FragColor = vec4(gamma_color, 1);