PassthroughSkybox.shader

Shader "Hidden/PassthroughSkybox"
{
    Properties
    {
        [NoScaleOffset] _Tex ("Cubemap", Cube) = "grey" {}
    }

    SubShader
    {
        Tags { "Queue"="Background" "RenderType"="Background" "PreviewType"="Skybox" }
        Cull Off ZWrite Off

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma target 5.0

            #include "UnityCG.cginc"

            samplerCUBE _Tex;
            half4 _Tex_HDR;

            struct appdata_t
            {
                float4 vertex : POSITION;
                UNITY_VERTEX_INPUT_INSTANCE_ID
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                float3 texcoord : TEXCOORD0;
                UNITY_VERTEX_OUTPUT_STEREO
            };

            v2f vert (appdata_t v)
            {
                v2f o;
                UNITY_SETUP_INSTANCE_ID(v);
                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.texcoord = v.vertex.xyz;
                return o;
            }

            float4 frag (v2f i) : SV_Target
            {
                half4 tex = texCUBE (_Tex, i.texcoord);
                half3 c = DecodeHDR (tex, _Tex_HDR);
                return half4(c, 1);
            }
            ENDCG
        }
    }

    Fallback Off
}