Shader "KernelPanic/stencil"
{
    Properties
    {
//        _NoiseTex ("Noise Tex", 2D) = "black" 
	    [HideInInspector]_MainTex ("Base (RGB)", 2D) = "white" {}
	    _GlitchBlendTex ("Glitch", 2D) = "black" {}
	    _NoiseTex ("Noise", 2D) = "black" {}
//        [Range(0,1)] _Sample ("Sample", Float) = 0.5
    }
    SubShader
    {
        // No culling or depth
        Cull Off ZWrite Off ZTest Always Blend SrcAlpha OneMinusSrcAlpha

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                return o;
            }
            
            sampler2D _MainTex;
            sampler2D _GlitchBlendTex;
            sampler2D _NoiseTex;
            sampler2D _CameraDepthTexture;
            
            float _Sample;

            fixed4 frag (v2f i) : SV_Target
            {
                // depth
                float d  = tex2D(_CameraDepthTexture, i.uv);
                
                // sample frame
                float4 c = tex2D(_MainTex, i.uv);

                // sample noise
                float2 scroll = float2(sin(_Time.y), cos(_Time.w));
                float4 n = tex2D(_NoiseTex, i.uv + scroll);
                
                // sample frame but with noise
                float4 cn = tex2D(_MainTex, i.uv + n.xy);

                // raw blended glitch used to blend between things
                float4 g = tex2D(_GlitchBlendTex, i.uv);

                // c = lerp(c,cn,g);
                c = lerp(c,g,g);
                
                return c;
                // return tex2D(_CameraDepthTexture, i.uv);
            }
            ENDCG
        }
    }
}