add bending test.

Assets/uDesktopDuplication/Shaders/uDD_Unlit.shader

@@ -5,6 +5,8 @@ Properties
 {
     _Color ("Color", Color) = (1, 1, 1, 1)
     _MainTex ("Texture", 2D) = "white" {}
+    [Toggle(USE_BEND)] _UseBend("UseBend", Float) = 0
+	[PowerSlider(10.0)]_Radius ("Radius", Range(3, 100)) = 10
     [KeywordEnum(Off, Front, Back)] _Cull("Culling", Int) = 2
 }
 
@@ -20,9 +22,16 @@ CGINCLUDE
 #include "./uDD_Common.cginc"
 #include "./uDD_Params.cginc"
 
+fixed _Radius;
+
 v2f vert(appdata v)
 {
     v2f o;
+#ifdef USE_BEND
+	half a = v.vertex.x / _Radius;
+	v.vertex.x =  _Radius * sin(a);
+	v.vertex.y += _Radius * (1 - cos(a));
+#endif
     o.vertex = UnityObjectToClipPos(v.vertex);
     o.uv = TRANSFORM_TEX(v.uv, _MainTex);
     return o;
@@ -40,9 +49,10 @@ Pass
     CGPROGRAM
     #pragma vertex vert
     #pragma fragment frag
-    #pragma multi_compile ___ INVERT_X
-    #pragma multi_compile ___ INVERT_Y
-    #pragma multi_compile ___ VERTICAL
+    #pragma shader_feature ___ INVERT_X
+    #pragma shader_feature ___ INVERT_Y
+    #pragma shader_feature ___ VERTICAL
+    #pragma shader_feature ___ USE_BEND
     ENDCG
 }