Billboard.shader

Shader "Custom/Billboard" {

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

		Tags{
		
			"Queue"="Transparent"
			"SortingLayer"="Resources_Sprites" 
			"IgnoreProjector"="True" 
			"RenderType"="Transparent" 
			"PreviewType"="Plane"
			"CanUseSpriteAtlas"="True"
			"DisableBatching"="True"
			
		}
 
		Cull Off
		Lighting Off
		ZWrite Off
		Blend One OneMinusSrcAlpha
 
		Pass{
		
			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.texcoord = IN.texcoord;
				OUT.color = IN.color * _Color;

				OUT.vertex = mul(UNITY_MATRIX_P, mul(UNITY_MATRIX_MV, float4(0.0, 0.0, 0.0, 1.0)) - float4(IN.vertex.y, IN.vertex.x, 0.0, 0.0) * float4(0.50, 0.50, 1.0, 1.0));
 
				return OUT;
				
			}
 
			sampler2D _MainTex;
			sampler2D _AlphaTex;
 
			fixed4 SampleSpriteTexture(float2 uv){

				fixed4 color = tex2D(_MainTex, uv);

				return color;

			}
 
			fixed4 frag(v2f IN):SV_Target{
			
				fixed4 c = SampleSpriteTexture (IN.texcoord) * IN.color;
				c.rgb *= c.a;
				return c;
			}
			
		ENDCG
		
		}
		
	}
	
 }