diff --git a/Shaders/UIAdditive.shader b/Shaders/UIAdditive.shader
index 69797b8..d5acc4f 100644
--- a/Shaders/UIAdditive.shader
+++ b/Shaders/UIAdditive.shader
@@ -4,7 +4,7 @@
 	{
 		_MainTex ("Sprite Texture", 2D) = "white" {}
 		_Color ("Tint", Color) = (1,1,1,1)
-		
+
 		_StencilComp ("Stencil Comparison", Float) = 8
 		_Stencil ("Stencil ID", Float) = 0
 		_StencilOp ("Stencil Operation", Float) = 0
@@ -12,25 +12,26 @@
 		_StencilReadMask ("Stencil Read Mask", Float) = 255
 
 		_ColorMask ("Color Mask", Float) = 15
-		_ClipRect ("Clip Rect", Vector) = (-32767, -32767, 32767, 32767)
+
+		[Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0
 	}
 
 	SubShader
 	{
 		Tags
-		{ 
-			"Queue"="Transparent" 
-			"IgnoreProjector"="True" 
-			"RenderType"="Transparent" 
+		{
+			"Queue"="Transparent"
+			"IgnoreProjector"="True"
+			"RenderType"="Transparent"
 			"PreviewType"="Plane"
 			"CanUseSpriteAtlas"="True"
 		}
-		
+
 		Stencil
 		{
 			Ref [_Stencil]
 			Comp [_StencilComp]
-			Pass [_StencilOp] 
+			Pass [_StencilOp]
 			ReadMask [_StencilReadMask]
 			WriteMask [_StencilWriteMask]
 		}
@@ -46,53 +47,68 @@
 
 		Pass
 		{
+			Name "Default"
 		CGPROGRAM
 			#pragma vertex vert
 			#pragma fragment frag
+			#pragma target 2.0
+
 			#include "UnityCG.cginc"
 			#include "UnityUI.cginc"
-			
+
+			#pragma multi_compile __ UNITY_UI_CLIP_RECT
+			#pragma multi_compile __ UNITY_UI_ALPHACLIP
+
 			struct appdata_t
 			{
 				float4 vertex   : POSITION;
 				float4 color	: COLOR;
 				float2 texcoord : TEXCOORD0;
+				UNITY_VERTEX_INPUT_INSTANCE_ID
 			};
 
 			struct v2f
 			{
 				float4 vertex   : SV_POSITION;
 				fixed4 color	: COLOR;
-				half2 texcoord  : TEXCOORD0;
+				float2 texcoord  : TEXCOORD0;
 				float4 worldPosition : TEXCOORD1;
+				UNITY_VERTEX_OUTPUT_STEREO
 			};
 			
 			fixed4 _Color;
 			sampler2D _MainTex;
 			float4 _MainTex_ST;
+			fixed4 _TextureSampleAdd;
 			float4 _ClipRect;
 
-			v2f vert(appdata_t IN)
+			v2f vert(appdata_t v)
 			{
 				v2f OUT;
-				OUT.worldPosition = IN.vertex;
-				OUT.vertex = UnityObjectToClipPos(IN.vertex);
-				OUT.texcoord = TRANSFORM_TEX(IN.texcoord, _MainTex);
-#ifdef UNITY_HALF_TEXEL_OFFSET
-				OUT.vertex.xy += (_ScreenParams.zw-1.0)*float2(-1,1);
-#endif
-				OUT.color = IN.color * _Color;
+				UNITY_SETUP_INSTANCE_ID(v);
+				UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
+				OUT.worldPosition = v.vertex;
+				OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);
+
+				OUT.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
+
+				OUT.color = v.color * _Color;
 				return OUT;
 			}
 
 			fixed4 frag(v2f IN) : SV_Target
 			{
-				half4 color = tex2D(_MainTex, IN.texcoord) * IN.color;
+				half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;
+
+				#ifdef UNITY_UI_CLIP_RECT
 				color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
+				#endif
+
+				#ifdef UNITY_UI_ALPHACLIP
+				clip (color.a - 0.001);
+				#endif
+				
 				color.rgb *= color.a;
-#ifdef UNITY_UI_ALPHACLIP
-				clip (color.a - 0.01);
-#endif
 				return color;
 			}
 		ENDCG