CRTの勉強 その①

CRT_Shader.shader

Shader "CRT_Shader"
{
    Properties
    {
        //_MainTex ("Texture", 2D) = "white" {}
    }
    SubShader
    {
        Cull Off ZWrite Off ZTest Always
        Pass
        {
            Name "Culculate1"

            CGPROGRAM
            
            // UnityCustomRenderTexture.cgincをインクルードする
            #include "UnityCustomRenderTexture.cginc"

            // 頂点シェーダは決まったものを使う
            #pragma vertex CustomRenderTextureVertexShader
            #pragma fragment frag

            // v2f構造体は決まったものを使う
            half4 frag(v2f_customrendertexture i) : SV_Target
            {
                return fixed4(0.8 * frac(_Time.x), 0, 0, 1.0);
            }

            ENDCG
        }
        Pass
        {
            Name "Culculate2"

            CGPROGRAM
            
            #include "UnityCustomRenderTexture.cginc"

            #pragma vertex CustomRenderTextureVertexShader
            #pragma fragment frag

            half4 frag(v2f_customrendertexture i) : SV_Target
            {
                return fixed4(0, 0.7 * frac(_Time.z), 0, 1.0);
            }

            ENDCG
        }
        Pass
        {
            Name "Culculate3"

            CGPROGRAM
            
            #include "UnityCustomRenderTexture.cginc"

            #pragma vertex CustomRenderTextureVertexShader
            #pragma fragment frag

            half4 frag(v2f_customrendertexture i) : SV_Target
            {
                return fixed4(0, 0, 0.6 * frac(_Time.w), 1.0);
            }

            ENDCG
        }
        Pass
        {
            Name "Culculate4"

            CGPROGRAM
            
            #include "UnityCustomRenderTexture.cginc"

            #pragma vertex CustomRenderTextureVertexShader
            #pragma fragment frag

            half4 frag(v2f_customrendertexture i) : SV_Target
            {
                return fixed4(0.8 * frac(_Time.x), 0.7 * frac(_Time.z), 0.6 * frac(_Time.w), 1.0);
            }

            ENDCG
        }
    }
}

Transfered_Data.shader

Shader "CRT_Transfer_Data"
{
    Properties
    {
        _MainTex ("CRT", 2D) = "white"{}
        [IntRange] _Index ("Index", Range(1, 4)) = 1
        [IntRange] _selectRGB ("R = 1, G = 2, B = 3", Range(1, 3)) = 1
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile_fog

            #include "UnityCG.cginc"

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

            struct v2f
            {
                float2 uv : TEXCOORD0;
                UNITY_FOG_COORDS(1)
                float4 vertex : SV_POSITION;
            };

            sampler2D _MainTex;
            float4 _MainTex_ST;

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                UNITY_TRANSFER_FOG(o,o.vertex);
                return o;
            }

            int _Index, _selectRGB;

            fixed4 frag (v2f i) : SV_Target
            {
                float uv_x = fmod(_Index, 2) == 0 ? 0.75 : 0.25;
                float uv_y = step(1.1, _Index / 2.0) ? 0.75 : 0.25;
                fixed4 col = tex2D(_MainTex, float2(uv_x, uv_y));
                
                if(_selectRGB == 1)
                {
                    col = step(0.5, col.r) ? fixed4(1, 1, 1, 1) : fixed4(0, 0, 0, 1);
                }
                else if(_selectRGB == 2)
                {
                    col = step(0.5, col.g) ? fixed4(1, 1, 1, 1) : fixed4(0, 0, 0, 1);
                }
                else if(_selectRGB == 3)
                {
                    col = step(0.5, col.b) ? fixed4(1, 1, 1, 1) : fixed4(0, 0, 0, 1);
                }
                UNITY_APPLY_FOG(i.fogCoord, col);
                return col;
            }
            ENDCG
        }
    }
}