Add UV Sky shader

UV Sky/README.md

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+# UV Sky
+A 360° video skybox shader.
+
+## Download
+Download the shader [here](UVSky.shader) and drag it into a shaders folder.
+
+## How To Use
+Create a new material, use the shader select to select `Synergiance/Skybox/UV Sky`, drag your desired texture into the texture slot.  Use the slider below to adjust the orientation.

UV Sky/UVSky.shader

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+Shader "Synergiance/Skybox/UV Sky"
+{
+    Properties {
+        [NoScaleOffset] _MainTex ("Texture", 2D) = "default" {}
+        _Rotation ("Rotation (Degrees)", Range(-180, 180)) = 0
+    }
+    SubShader
+    {
+        Tags { "RenderType"="Opaque" }
+        LOD 100
+
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+
+            #include "UnityCG.cginc"
+
+            #define ONE_OVER_PI 0.31830988618
+
+            #if defined(USING_STEREO_MATRICES)
+                #define _ActualWorldSpaceCameraPos unity_StereoWorldSpaceCameraPos[unity_StereoEyeIndex]
+            #else
+                #define _ActualWorldSpaceCameraPos _WorldSpaceCameraPos
+            #endif
+
+            struct appdata {
+                float4 vertex : POSITION;
+            };
+
+            struct v2f {
+                float4 vertex : SV_POSITION;
+                float3 worldPos : TEXCOORD0;
+            };
+
+            sampler2D _MainTex;
+            float _Rotation;
+
+            v2f vert (appdata v) {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
+                return o;
+            }
+
+            fixed4 frag (v2f i) : SV_Target {
+                float3 viewDir = i.worldPos.xyz - _ActualWorldSpaceCameraPos.xyz;
+                float longitude = atan2(viewDir.x, viewDir.z);
+                float latitude = atan2(length(viewDir.xz), viewDir.y);
+                float2 uv = float2(longitude * 0.5, latitude) * ONE_OVER_PI;
+                uv.x += _Rotation / 360;
+                fixed4 col = tex2D(_MainTex, uv);
+                return col;
+            }
+            ENDCG
+        }
+    }
+}