Shader "Metropolia/Damage"
{
	Properties
	{
		_Damage("Damage", range(0,1)) = 0
	}

	SubShader
	{
		Pass
		{
			CGPROGRAM

			#pragma vertex vert
			#pragma fragment frag
			#include "Lighting.cginc"

			struct appdata
			{
				float4 pos : POSITION;
				float3 nor : NORMAL;
			};

			struct v2f
			{
				float4 pos : SV_POSITION;
				float3 nor : NORMAL;
			};

			float _Damage;

			v2f vert(appdata i)
			{
				v2f o;
				o.pos = UnityObjectToClipPos(i.pos);
				o.nor = UnityObjectToWorldNormal(i.nor);
				return o;
			}

			fixed4 frag(v2f i) : SV_Target
			{
				float ndl = max(0, dot(i.nor, _WorldSpaceLightPos0));
				fixed4 col = lerp(
					fixed4(0.5, 0.5, 0.5, 1),
					fixed4(1.0, 0.5, 0.5, 1),
					_Damage);
				return col * ndl * 2;
			}

			ENDCG
		}
	}
}