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Shader "Custom/Outline"
{
    Properties //variables
    {
        _MainTex("Main Texture (RGB)",2D) = "white" {} // allows for a texture property
        _Color("Color", Color) = (1,1,1,1) // allows for a color property
        _OutlineTex("Outline Texture", 2D) = "white" {}
        _OutlineColor("Outline Color", Color) = (1,1,1,1)
        _OutlineWidth("Outline Width", Range(1.0,10.0)) = 1.1
    }
 
    Subshader
    {
        Tags
        {
            "Queue" = "Transparent"
        }
 
        Pass
        {
            Name "OUTLINE"
 
            ZWrite Off
 
            CGPROGRAM // allows talk between two languages: shader lab and nvidia C for graphics
 
            // Function Defines - defines the name for the vertex and fragment functions
 
            // Define for the building function.
            // Has information of the shape and tells program how to build it
            #pragma vertex vert 
 
            // Define for coloring function
            #pragma fragment frag
 
            // Includes
 
            #include "UnityCG.cginc" // build in shader functions.
 
            // Structures - can get data like - vertices's, normal, color, uv
 
            //appdata basically says how the vertex function has going to get inforamtions
            struct appdata // vertex information
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };
 
            // how fragments get its data
            struct v2f // fragment inforamtion
            {
                //without SV_ this shader doesnt work on playstation and some other platforms
                float4 pos : SV_POSITION;
                float2 uv: TEXCOORD0;
            };
 
            // Imports - Re-import property from shader lab to nvidia cg
            // properties have to same the same name like in shader lab part
            float4 _OutlineColor;
            sampler2D _OutlineTex;
            float _OutlineWidth;
 
            // Vertex function - builds the object
            //vertex to fragment
 
            //put struct appdata (above) into IN and convert it into a v2f
            v2f vert(appdata IN)
            {
                //get all vertexes of the shape and it's going to
                //times it by the outline width
                // and so its gonna make it either the same size if its 1 or more than one
                // SO its gonna get the shape and then its goona increase it a bit bigger than the actual shape size
                IN.vertex.xyz *= _OutlineWidth;
 
                v2f OUT;
                // its gonna take the object form the object space and
                // put it into camera clip space so it's gonna allow it to appear 
                // on the screen
                OUT.pos = UnityObjectToClipPos(IN.vertex);
                // swapping the uvs to our uvs
                OUT.uv = IN.uv;
 
                return OUT;
            }
 
            // fragment function - color it in
 
            fixed4 frag(v2f IN) : SV_Target
            {
                //gets the teture and wraps it around the uvs of the objects
                float4 texColor = tex2D(_OutlineTex, IN.uv);
                return texColor * _OutlineColor;
            }
 
            ENDCG
        }
 
        Pass
        {
            Name "OBJECT"
            CGPROGRAM // allows talk between two languages: shader lab and nvidia C for graphics
 
            // Function Defines - defines the name for the vertex and fragment functions
 
            // Define for the building function.
            // Has information of the shape and tells program how to build it
            #pragma vertex vert 
 
            // Define for coloring function
            #pragma fragment frag
 
            // Includes
 
            #include "UnityCG.cginc" // build in shader functions.
 
            // Structures - can get data like - vertices's, normal, color, uv
            
            //appdata basically says how the vertex function has going to get inforamtions
            struct appdata // vertex information
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };
 
            // how fragments get its data
            struct v2f // fragment inforamtion
            {   
                //without SV_ this shader doesnt work on playstation and some other platforms
                float4 pos : SV_POSITION;
                float2 uv: TEXCOORD0;
            };
 
            // Imports - Re-import property from shader lab to nvidia cg
            // properties have to same the same name like in shader lab part
            float4 _Color;
            sampler2D _MainTex;
 
            // Vertex function - builds the object
            //vertex to fragment
 
            //put struct appdata (above) into IN and convert it into a v2f
            v2f vert(appdata IN)
            {
                v2f OUT;
                // its gonna take the object form the object space and
                // put it into camera clip space so it's gonna allow it to appear 
                // on the screen
                OUT.pos = UnityObjectToClipPos(IN.vertex); 
                // swapping the uvs to our uvs
                OUT.uv = IN.uv;
 
                return OUT;
            }
 
            // fragment function - color it in
 
            fixed4 frag(v2f IN) : SV_Target
            {
                //gets the teture and wraps it around the uvs of the objects
                float4 texColor = tex2D(_MainTex, IN.uv);
                return texColor * _Color;
            }
 
 
            ENDCG
        }
    }
}