Shader "World Political Map/HexaTileHighlight" {
    Properties {
        _Color ("Main Color", Color) = (0,0.25,1,0.8)
        _Color2 ("Second Color", Color) = (0,0.25,1,0.2)
        _ColorShift("Color Shift", Float) = 0
        _MainTex ("Main Texture (RGBA)", 2D) = "white"
        
    }
   SubShader {
                Tags { "Queue"="Geometry-10" "RenderType"="Transparent" }
                Blend SrcAlpha OneMinusSrcAlpha
                ZTest Always
                ZWrite Off

        Pass {
                CGPROGRAM
				#pragma vertex vert
				#pragma fragment frag
				#pragma fragmentoption ARB_precision_hint_fastest
				#include "UnityCG.cginc"

                sampler2D _MainTex;
                fixed4 _Color, _Color2;
                fixed _ColorShift;

                struct appdata {
    				float4 vertex : POSITION;
					float2 texcoord : TEXCOORD0;
                    UNITY_VERTEX_INPUT_INSTANCE_ID
    			};

				struct v2f {
	    			float4 pos : SV_POSITION;
	    			float2 uv: TEXCOORD0;
	    			fixed4 color: COLOR;
            UNITY_VERTEX_INPUT_INSTANCE_ID
            UNITY_VERTEX_OUTPUT_STEREO
				};

				v2f vert(appdata v) {
    				v2f o;
            UNITY_SETUP_INSTANCE_ID(v);
            UNITY_INITIALIZE_OUTPUT(v2f, o);
            UNITY_TRANSFER_INSTANCE_ID(v, o);
            UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
    				o.pos = UnityObjectToClipPos(v.vertex);
    				o.uv = v.texcoord;
    				o.color = lerp(_Color, _Color2, _ColorShift);
    				return o;
    			}

    			fixed4 frag (v2f i) : SV_Target {
                    UNITY_SETUP_INSTANCE_ID(i);
                    UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(i); 
                    return i.color * tex2D(_MainTex, i.uv);
                }
                ENDCG
               }
		}
	}