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

Shader "Projector/Custom" {
	Properties{
		_ShadowTex("Cookie", 2D) = "gray" {}
		_RangeRadiu("Radiu",Range(0,0.5)) = 0.2
		_RangeAngle("Angle",Range(0,180)) = 60
		_LineW1("LineW",Range(0,0.5)) = 0.1
		_LineW2("LineW",Range(0,0.1)) = 0.01
		_LineColor("LineColor",Color) = (1,0,0,1)
		_Forword("Forword",Vector) = (0,0,0,0)
		_Type("Type",Int) = 1
	}
		Subshader{
		Tags{ "Queue" = "Transparent" }
		Pass{
		ZWrite Off
		ColorMask RGB

		Blend SrcAlpha OneMinusSrcAlpha

		CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"

		struct v2f {
			float2 uvShadow : TEXCOORD0;
			float4 pos : SV_POSITION;
	};

	float4x4 unity_Projector;
	float4x4 unity_ProjectorClip;

	v2f vert(float4 vertex : POSITION)
	{
		v2f o;
		o.pos = UnityObjectToClipPos(vertex);
		o.uvShadow = mul(unity_Projector, vertex);
		return o;
	}

	sampler2D _ShadowTex;
	float _RangeRadiu;
	float _RangeAngle;
	float _LineW1;
	float _LineW2;
	float4 _LineColor;
	float4 _Forword;
	int _Type;  //是否需要对贴图进行裁剪

	fixed4 frag(v2f i) : SV_Target
	{
		fixed4 texS = tex2D(_ShadowTex, i.uvShadow);
		fixed4 res = texS;
		if (_Type <= 0)
			return res;
		float2 center = float2(0.5, 0.5);
		float dis = distance(i.uvShadow, center);

		float2 dir = float2(i.uvShadow.x - 0.5,i.uvShadow.y - 0.5);
		float2 centerDir = float2(_Forword .x-0.5, _Forword .y-0.5);
		float angle = dot(dir, centerDir)/(length(dir)*length(centerDir));
		float angleMax = cos(radians(_RangeAngle));

		if (dis < _RangeRadiu)
		{
			res = fixed4(0, 0, 0, 0);
		}
		else
		{
			if (dis >= _RangeRadiu && dis < _RangeRadiu + _LineW1)
			{
				if (angle > angleMax)
				{
					res = _LineColor;
				}
				else
				{
					res = fixed4(0, 0, 0, 0);
				}
			}
			else
			{
				if (dis >= _RangeRadiu + _LineW1 && dis < 0.5- _LineW1)
				{
					if (angle > angleMax && angle < angleMax+ _LineW2)
					{
						res = _LineColor;
					}
					else
					{
						if(angle <= angleMax)
							res = fixed4(0, 0, 0, 0);
					}
				}
				else
				{
					if (dis >= 0.5- _LineW1 && dis <0.5)
					{
						if (angle > angleMax)
						{
							res = _LineColor;
						}
						else
						{
							res = fixed4(0, 0, 0, 0);
						}
					}
				}
			}
		}
		return res;
	}
		ENDCG
	}
		}
}