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
		}
	}
}