Unity - Pixel/Fragment Shader

Shader "Custom/SamplePixelShader" {
    Properties{
        _Color ("Main Color", Color) = (1,0,1,1)
        _MainTex ("Texture RGBA", 2D) = "white" {}
        //_Alpha("Alpha" ,Range(0,1)) = 0.5
        //_SpecColor ("Spec Color", Color) = (1,1,1,0)
        //_Emission ("Emissive Color", Color) = (0,0,0,0)
        //_Shininess ("Shininess", Range (0.1, 1)) = 0.7
    }
    Category{
    
    
        SubShader
        {
            Tags { "Queue" = "Transparent"  "IgnoreProjector"="True" "RenderType"="Transparent"}
            Pass{
                ZWrite On
                ColorMask 0    
            }
            Pass 
            {
                Cull Off
                Blend SrcAlpha OneMinusSrcAlpha
                CGPROGRAM
                #pragma vertex vert
                #pragma fragment frag

                    //user defined variables
                    uniform float4 _Color;
                    uniform sampler2D _MainTex;
                    
                    
                    struct vertexInput {
                        float4 vertex : POSITION;
                        float4 texcoord : TEXCOORD0;
                    };
                    
                    struct vertexOutput {
                        float4 pos : SV_POSITION;
                        float2 texco : TEXCOORD0;
                    };
                    
                    //vertex function
                    vertexOutput vert(vertexInput v){
                        vertexOutput o;
                        o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
                        o.texco = v.texcoord;
                        return o;
                    }
                    //fragment/pixel function
                    fixed4 frag(vertexOutput i) : COLOR {
                        float4 c = tex2D(_MainTex, i.texco ) * _Color;
                        float3 emissive = c.rgb ;
                        float3 finalColor = emissive;
                        float alpha = c.a * _Color.a;
                        return fixed4(finalColor,alpha);
                        
                    }
                ENDCG

            }
        }
    }
    //Fallback "Diffuse"
}

Blending Types :

Blend SrcAlpha OneMinusSrcAlpha // Alpha blending Blend One One // Additive Blend OneMinusDstColor One // Soft Additive Blend DstColor Zero // Multiplicative Blend DstColor SrcColor // 2x Multiplicative

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