Shader "DashGame/HighLight"
{
	Properties
	{
		[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
		_Color("Tint", Color) = (1,1,1,1)
		[MaterialToggle] PixelSnap("Pixel snap", Float) = 0
	}

	SubShader
	{
		Tags
		{
			"Queue" = "Transparent"
			"IgnoreProjector" = "True"
			"RenderType" = "Transparent"
			"PreviewType" = "Plane"
			"CanUseSpriteAtlas" = "True"
		}

		Cull Off
		Lighting Off
		ZWrite Off

		Pass
		{
				Blend SrcAlpha OneMinusSrcAlpha

				CGPROGRAM
				
				#pragma vertex vert
				#pragma fragment frag
				#pragma target 2.0
				#pragma multi_compile _ PIXELSNAP_ON
				#pragma multi_compile _ ETC1_EXTERNAL_ALPHA
				
				#include "UnityCG.cginc"

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

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

				fixed4 _Color;

				v2f vert(appdata_t IN)
				{
					v2f OUT;
					UNITY_SETUP_INSTANCE_ID(IN);
					UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
					OUT.vertex = UnityObjectToClipPos(IN.vertex);
					OUT.texcoord = IN.texcoord;
					OUT.color = IN.color * _Color;
					#ifdef PIXELSNAP_ON
					OUT.vertex = UnityPixelSnap(OUT.vertex);
					#endif

					return OUT;
				}

				sampler2D _MainTex;
				sampler2D _AlphaTex;

				fixed4 SampleSpriteTexture(float2 uv)
				{
					fixed4 color = tex2D(_MainTex, uv);

					#if ETC1_EXTERNAL_ALPHA
					// get the color from an external texture (usecase: Alpha support for ETC1 on android)
					color.a = tex2D(_AlphaTex, uv).r;
					#endif //ETC1_EXTERNAL_ALPHA

					return color;
				}

				fixed4 frag(v2f IN) : SV_Target
				{
					fixed4 c = SampleSpriteTexture(IN.texcoord) * IN.color;
					c.rgb *= c.a;
	
					if (c.a == 0) 
					{
						discard;
					}
					else if(c.a < 1)
					{
						c.rgb = fixed3(1, 1, 1);
					}
	
					return c;
				}
				ENDCG
		}
	}
}