Skybox_Vertex.cg

struct appdata
{
    float4 position : POSITION;
    float3 texcoord : TEXCOORD0;
};

struct v2f
{
    float4 position : SV_POSITION;
    float3 texcoord : TEXCOORD0;
};

v2f vert(appdata v)
{
    v2f o;
    o.position = UnityObjectToClipPos(v.position);
    o.texcoord = v.texcoord;
    return o;
}