//如果用在会被mask切掉的UI上，把Stencil Comparison改成4，Stencil ID改成2

Shader "MoleGame/Particles/Additive" {
	Properties{
		_TintColor("Tint Color", Color) = (0.5,0.5,0.5,0.5)
		_MainTex("Particle Texture", 2D) = "white" {}
		//4 equal
		_StencilComp("Stencil Comparison", Float) = 8
		//2 ui mask
		_Stencil("Stencil ID", Float) = 0
		_StencilOp("Stencil Operation", Float) = 0
		_StencilWriteMask("Stencil Write Mask", Float) = 255
		_StencilReadMask("Stencil Read Mask", Float) = 255
		_ColorMask("Color Mask", Float) = 15
	}

	Category{
		Tags{ "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" "PreviewType" = "Plane" }
		Stencil{
			Ref[_Stencil]
			Comp[_StencilComp]
			Pass[_StencilOp]
			ReadMask[_StencilReadMask]
			WriteMask[_StencilWriteMask]
		}

		ZTest[unity_GUIZTestMode]
		ColorMask[_ColorMask]

		Blend SrcAlpha One
		Cull Off Lighting Off ZWrite Off

		SubShader{
			Pass{

				CGPROGRAM
				#pragma vertex vert
				#pragma fragment frag
				#pragma target 2.0
				//#pragma multi_compile_particles
				//#pragma multi_compile_fog

				#include "UnityCG.cginc"

				sampler2D _MainTex;
				float4 _MainTex_ST;
				fixed4 _TintColor;

				struct appdata_t {
					float4 vertex : POSITION;
					fixed4 color : COLOR;
					float2 texcoord : TEXCOORD0;
				};

				struct v2f {
					float4 vertex : SV_POSITION;
					fixed4 color : COLOR;
					float2 texcoord : TEXCOORD0;
				};

				v2f vert(appdata_t v)
				{
					v2f o;
					o.vertex = UnityObjectToClipPos(v.vertex);
					o.color = v.color;
					o.texcoord = TRANSFORM_TEX(v.texcoord,_MainTex);
					return o;
				}

				fixed4 frag(v2f i) : SV_Target
				{
					fixed4 col = i.color * _TintColor * tex2D(_MainTex, i.texcoord);
#ifdef UNITY_UI_CLIP_RECT
					col.a *= UnityGet2DClipping(i.worldPosition.xy, _ClipRect);
#endif
					return col;
				}
				ENDCG
			}
		}
	}
}