// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Custom/SimpleShieldShader2" {
	Properties {
		_Color ("Color", Color) = (1,1,1,1)
		_PointColor("Point Color (RGB)", Color) = (1,0,0,1)
		_MainTex ("Albedo (RGB)", 2D) = "white" {}
		_ImpactSize("ImpactSize", Float) = 0.5

	}
	SubShader {
		Tags { "Queue" = "Transparent" }

		LOD 200

		Blend One One
		Lighting Off

		CGPROGRAM
		// Physically based Standard lighting model, and enable shadows on all light types
		#pragma surface surf Standard //NoLighting

		// Use shader model 3.0 target, to get nicer looking lighting
		#pragma target 3.0

		sampler2D _MainTex;

		struct Input {

			float2 uv_MainTex;
			float3 worldPos;
		};

		fixed4 _Color;
		fixed4 _PointColor;
		float _ImpactSize;
		int _PointsSize;
		fixed4 _Points[50];

		void surf (Input IN, inout SurfaceOutputStandard o) {

			fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
			fixed emissive = 0;

			float3 objPos = mul(unity_WorldToObject, float4(IN.worldPos, 1)).xyz;
			for (int i = 0; i < _PointsSize; ++i) {
				float amount = max(0, frac(1.0 - max(0, (_Points[i].w * _ImpactSize) - distance(_Points[i].xyz, objPos.xyz)) / _ImpactSize) * (1 - _Points[i].w));
				emissive += amount;
			}

			o.Albedo = c.rgb;
			o.Emission = emissive * _PointColor;
			o.Metallic = 0;
			o.Smoothness = 0;
			o.Alpha = c.r;
		}
		ENDCG
	}
	FallBack "Diffuse"
}