Add ultimate xr

Assets/UltimateXR/Runtime/Shaders/Video/VideoRGBTopAlphaBottomAdditive.shader

@@ -0,0 +1,64 @@
+Shader "UltimateXR/Video/Video RGB (Top) + Alpha (Bottom) Additive"
+{
+	Properties
+	{
+		_MainTex ("Texture", 2D) = "white" {}
+		_Color("Color", Color) = (1, 1, 1, 1)
+	}
+	SubShader
+	{
+		Tags{ "Queue" = "Transparent" "RenderType" = "Transparent" "IgnoreProjector" = "True" }
+		LOD 100
+
+		Pass
+		{
+			Blend SrcAlpha One
+
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+			
+			#include "UnityCG.cginc"
+
+			struct appdata
+			{
+				float4 vertex : POSITION;
+				float2 uv     : TEXCOORD0;
+				float4 color  : COLOR;
+			};
+
+			struct v2f
+			{
+				float4 vertex : POSITION;
+				float2 uv     : TEXCOORD0;
+				float4 color  : COLOR;
+			};
+
+			sampler2D _MainTex;
+			float4    _MainTex_ST;
+			float4    _Color;
+			
+			v2f vert (appdata v)
+			{
+				v2f o;
+				o.vertex = UnityObjectToClipPos(v.vertex);
+				o.uv = TRANSFORM_TEX(v.uv, _MainTex);
+				o.color = v.color;
+				return o;
+			}
+			
+			fixed4 frag (v2f i) : SV_Target
+			{
+#if UNITY_UV_STARTS_AT_TOP
+				float4 rgb = tex2D(_MainTex, half2(i.uv.x, (i.uv.y * 0.5) + 0.5)) *_Color * i.color;
+				float  a   = tex2D(_MainTex, half2(i.uv.x, i.uv.y * 0.5)).r * _Color.a * i.color.a;
+#else
+				float4 rgb = tex2D(_MainTex, half2(i.uv.x, i.uv.y * 0.5)) *_Color * i.color;
+				float  a   = tex2D(_MainTex, half2(i.uv.x, (i.uv.y * 0.5) + 0.5)).r * _Color.a * i.color.a;
+#endif
+				return float4(rgb.rgb, a);
+			}
+			ENDCG
+		}
+	}
+}