depth.shader

Shader "Custom/MyTestShader"
{
    Properties
    {
        _Shift ("Shift", Range(0.0, 5.0))      = 0
    }
    SubShader
    {
        // Draw ourselves after all opaque geometry
        Tags { "Queue" = "Overlay" "DisableBatching" = "True" }
        Cull Off

        GrabPass { "_GrabTexture" }
        Pass {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            sampler2D _GrabTexture,_CameraDepthTexture;
            float _Shift;

            struct appdata
            {
                float4 vertex : POSITION;
            };

            struct v2f
            {
                float4 grabPos : TEXCOORD0;
                float4 vertex : SV_POSITION;
                float4 screenPos : TEXCOORD1;
                bool isCam : COLOR0;
            };
            
            
            v2f vert (appdata v)
            {
                v2f o = (v2f)0;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.grabPos = ComputeGrabScreenPos(o.vertex);
                o.isCam = (_ScreenParams.x >= 3840 && _ScreenParams.y >= 2160);
                //o.isCam = o.isCam * (abs(UNITY_MATRIX_V._12) >= 0.00000174532926);
                return o;
            }
            
            fixed4 frag (v2f i) : SV_Target
            {
#if defined(USING_STEREO_MATRICES)
                discard;
#endif
                if(i.isCam < 1) discard;

                fixed4 passthru = tex2Dproj(_GrabTexture,i.grabPos);

                float2 depthtexpos = i.grabPos.xy  / i.grabPos.w;
                float2 viewPortPos = i.grabPos.xy / i.grabPos.w;
                float2 screenPosInPixel = viewPortPos.xy * _ScreenParams.xy;

                
                half depth = LinearEyeDepth(tex2D(_CameraDepthTexture,depthtexpos))/10;

                fixed4 color = lerp(passthru,depth,(fmod(screenPosInPixel.y, 4.0f) < 1) && (fmod(screenPosInPixel.x, 4.0f) < 1));
                return color;
            }
            

            ENDCG
        }
    }
}