Demo 34 - Cosmic effect

Shader "Custom/CosmicEffect"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Zoom ("Zoom", Range(0.5, 20)) = 1
        _Speed ("Speed", Range(0.01, 10)) = 1
    }
    SubShader
    {
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            float4 vert (appdata_base v) : SV_POSITION
            {
                return mul(UNITY_MATRIX_MVP, v.vertex);
            }

            sampler2D _MainTex;
            half _Zoom;
            half _Speed;

            fixed4 frag (float4 i : VPOS) : SV_Target
            {
                return tex2D(_MainTex, float2((i.xy/ _ScreenParams.xy) + float2(_CosTime.x * _Speed, _SinTime.x * _Speed) / _Zoom));
            }
            ENDCG
        }
    }
}