Add the other three YUV formats to the shader

data/yuv.frag

@@ -13,7 +13,17 @@ void
 main()
 {
     // Sample format: Y,U,Y,V
-    vec4 samples = texture2D(texture, texture_coord);
+    vec4 raw = texture2D(texture, texture_coord);
+    #if defined(FMT_YUYV)
+    vec4 samples = raw.xyzw;
+    #elif defined(FMT_YVYU)
+    vec4 samples = raw.xwzy;
+    #elif defined(FMT_UYVY)
+    vec4 samples = raw.yzwx;
+    #elif defined(FMT_VYUY)
+    vec4 samples = raw.wzyx;
+    #endif
+
     float y = samples.x;
     float u = samples.y-0.5;
     float v = samples.w-0.5;