WorldMap

overlay.shader

Shader "WorldMap/Hightlight"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
		_Color("Color", Color) = (0,1,0)
		_Scale("Scale", Float) = 1
		_Brightness("Brightness", Float) = 1
	}
	SubShader
	{
		Tags { "Queue"="Transparent" "LightMode" = "ForwardBase"}
		Blend SrcAlpha OneMinusSrcAlpha
		ZWrite Off
		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "UnityCG.cginc"
			sampler2D _MainTex;
			float4 _MainTex_ST;
			float3 _Color;
			float _Scale;
			float _Brightness;
			struct a2v {
				float4 vertex: POSITION;
				float2 tex1: TEXCOORD1;
			};
			struct v2f {
				float4 pos: SV_POSITION;
				float2 uv: TEXCOORD0;
			};
			v2f vert(a2v v) {
				v2f o;
				o.pos = UnityObjectToClipPos(v.vertex);
				o.uv.xy = TRANSFORM_TEX(v.tex1, _MainTex);
				return o;
			}
			fixed4 frag(v2f i) : SV_Target {
				fixed3 color;
				fixed3 liuming = fixed3(0.299, 0.587, 0.114);
				fixed4 albedo = tex2D(_MainTex, i.uv);
				fixed3 base = albedo.xyz * 255;
				fixed3 blend = _Scale * _Color * 255;
				fixed gray = dot(albedo.rgb, liuming);
				fixed3 one = fixed3(255, 255, 255);
				if (gray < 0.5)
					color = base * blend / 128;
				else
					color = one - (one - base) * (one - blend) / 128;
				return fixed4(color / 255 * _Brightness, albedo.a);
			}
			ENDCG
		}
	}
	Fallback off
}