颜色混合

Shader "Custom/multipass" {
    Properties {
        _MainTex ("Base (RGB)", 2D) = "white" {}
    }
    SubShader {
        Tags { "RenderType"="Opaque" }
            pass{
            Name "pass1"
        CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"
            sampler2D _MainTex;
            float4 _MainTex_ST;
            
            struct v2f{
                float4 pos:SV_POSITION;
                float2 uv:TEXCOORD0;
            };
            
            v2f vert(appdata_base v){
                v2f o;
                o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
                o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
                return o;
            }
            
            float4 frag(v2f i):COLOR{
                float4 texCol = tex2D(_MainTex, i.uv+0.1);
                float4 outp;
                outp = texCol * float4(0.2f,0.5f,0,1);
                return outp;
            
            }
            
        ENDCG
        }
        
            pass{
            Blend one one
            Name "pass2"
        CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"
            sampler2D _MainTex;
            float4 _MainTex_ST;
            struct v2f{
                float4 pos:SV_POSITION;
                float2 uv:TEXCOORD0;
            };
            
            v2f vert(appdata_base v){
                v2f o;
                o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
                o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
                return o;
            }
            
            float4 frag(v2f i):COLOR{
                float4 texCol = tex2D(_MainTex, i.uv);
                float4 outp;
                outp = texCol * float4(0,0.1f,0.51f,0);
                return outp;
            }
            
            
        ENDCG    
        }
    } 
    FallBack "Diffuse"
}