투명디스플레이 연구사업

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

// Upgrade NOTE: replaced 'texRECT' with 'tex2D'

Shader "Custom/Erode" {

    Properties

	{

		_MainTex ("_MainTex", 2D) = "white" {}

	}

    SubShader {

        Pass {

			ZTest Always Cull Off ZWrite Off

			Fog { Mode off }

            CGPROGRAM

            #pragma vertex vert

            #pragma fragment frag

            #include "UnityCG.cginc"

			uniform sampler2D _MainTex;    

			uniform float _TexResX;

			uniform float _TexResY;

            struct v2f {

                float4 pos : SV_POSITION;

                float2 uv : TEXCOORD0;

            };

			float4 _MainTex_ST; 

            v2f vert (appdata_base v)

            {

                v2f o;

                o.pos = UnityObjectToClipPos (v.vertex);

                o.uv = TRANSFORM_TEX (v.texcoord, _MainTex);

                return o;

            }

            fixed4 frag (v2f i) : SV_Target

            {

				fixed4 texColor = tex2D(_MainTex, i.uv);

				float minValue = 1.0;

				for(int y = -1; y < 2; y++)

				{

					for(int x = -1; x < 2; x++)

				    {

					    float val = tex2D(_MainTex, float2(i.uv.x + (float)x/_TexResX, i.uv.y + (float)y/_TexResY)).w;

					    if(val > 0.0)

					 	    val = 1.0;

					    if(val < minValue)

				 		    minValue = val;

				    }

				}

				//return fixed4(texColor.r, texColor.b, texColor.b, minValue);

				return fixed4(1.0, 1.0, 1.0, minValue);

            }

            ENDCG

        }

    }

}