Scrolling Sprite Shader Effect

Sprites_ScrollFX-ScreenSpace.shader

// Unity buit-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)

// modified to add scrolling lines fx, use black and white mask texture for scrollingtex. - unitycoder.com

Shader "Sprites/ScrollFX (ScreenSpace)"
{
	Properties
	{
		[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
		_ScrollTex("Scroll Texture", 2D) = "white" {}
		_Color("Tint", Color) = (1,1,1,1)
		_ScrollColor1("ScrollColor1", Color) = (1,1,1,1)
		_ScrollColor2("ScrollColor2", Color) = (0,0,0,0)
		[MaterialToggle] PixelSnap("Pixel snap", Float) = 0
		//[PerRendererData] 
		_FXScale("FXScale", Float) = 1
		_ScrollSpeed("Scroll Speed", Float) = 1
		[HideInInspector] _RendererColor("RendererColor", Color) = (1,1,1,1)
		[HideInInspector] _Flip("Flip", Vector) = (1,1,1,1)
		[PerRendererData] _AlphaTex("External Alpha", 2D) = "white" {}
		[PerRendererData] _EnableExternalAlpha("Enable External Alpha", Float) = 0
	}

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

		Cull Off
		Lighting Off
		ZWrite Off
		Blend One OneMinusSrcAlpha

		Pass
		{
			CGPROGRAM
			#pragma vertex SpriteVert
			#pragma fragment SpriteFrag
			#pragma target 2.0
			#pragma multi_compile_instancing
			#pragma multi_compile_local _ PIXELSNAP_ON
			#pragma multi_compile _ ETC1_EXTERNAL_ALPHA
			#include "UnityCG.cginc"
			//#include "UnitySprites.cginc"

			// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)

			//#ifndef UNITY_SPRITES_INCLUDED
			//#define UNITY_SPRITES_INCLUDED
			//#include "UnityCG.cginc"
			#ifdef UNITY_INSTANCING_ENABLED

			UNITY_INSTANCING_BUFFER_START(PerDrawSprite)

		// SpriteRenderer.Color while Non-Batched/Instanced.
		UNITY_DEFINE_INSTANCED_PROP(fixed4, unity_SpriteRendererColorArray)
		// this could be smaller but that's how bit each entry is regardless of type
		UNITY_DEFINE_INSTANCED_PROP(fixed2, unity_SpriteFlipArray)
		UNITY_INSTANCING_BUFFER_END(PerDrawSprite)

		#define _RendererColor  UNITY_ACCESS_INSTANCED_PROP(PerDrawSprite, unity_SpriteRendererColorArray)
		#define _Flip           UNITY_ACCESS_INSTANCED_PROP(PerDrawSprite, unity_SpriteFlipArray)

		#endif // instancing

		CBUFFER_START(UnityPerDrawSprite)
		#ifndef UNITY_INSTANCING_ENABLED
			fixed4 _RendererColor;
			fixed2 _Flip;
		#endif
			float _EnableExternalAlpha;
		CBUFFER_END

			// Material Color.
			fixed4 _Color;

			struct appdata_t
			{
				float4 vertex   : POSITION;
				float4 color    : COLOR;
				float2 texcoord : TEXCOORD0;
				float4 screenPos : TEXCOORD1;
				UNITY_VERTEX_INPUT_INSTANCE_ID
			};

			struct v2f
			{
				float4 vertex   : SV_POSITION;
				fixed4 color : COLOR;
				float2 texcoord : TEXCOORD0;
				float4 screenPos : TEXCOORD1;
				UNITY_VERTEX_OUTPUT_STEREO
			};

			inline float4 UnityFlipSprite(in float3 pos, in fixed2 flip)
			{
				return float4(pos.xy * flip, pos.z, 1.0);
			}

			v2f SpriteVert(appdata_t IN)
			{
				v2f OUT;

				UNITY_SETUP_INSTANCE_ID(IN);
				UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);

				OUT.vertex = UnityFlipSprite(IN.vertex, _Flip);
				OUT.vertex = UnityObjectToClipPos(OUT.vertex);
				OUT.texcoord = IN.texcoord;
				OUT.screenPos = ComputeScreenPos(OUT.vertex);
				OUT.color = IN.color * _Color * _RendererColor;

				#ifdef PIXELSNAP_ON
				OUT.vertex = UnityPixelSnap(OUT.vertex);
				#endif

				return OUT;
			}

			sampler2D _MainTex;
			sampler2D _ScrollTex;
			sampler2D _AlphaTex;
			float _ScrollSpeed;
			fixed4 _ScrollColor1;
			fixed4 _ScrollColor2;
			float _FXScale;

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

			#if ETC1_EXTERNAL_ALPHA
				fixed4 alpha = tex2D(_AlphaTex, uv);
				color.a = lerp(color.a, alpha.r, _EnableExternalAlpha);
			#endif

				return color;
			}

			fixed4 SpriteFrag(v2f IN) : SV_Target
			{
				fixed4 c = SampleSpriteTexture(IN.texcoord) * IN.color;
				//fixed4 fx = tex2D(_ScrollTex, IN.texcoord2+float2(_Time.x* _ScrollSpeed,0));
				fixed4 fx = tex2D(_ScrollTex, _FXScale*IN.screenPos +float2(_Time.x* _ScrollSpeed,0));
				c.rgb *= c.a;

				fx = lerp(_ScrollColor1, _ScrollColor2,fx.r);
				c.rgb = lerp(fx.rgb,c.rgb,1-fx.a)*c.a;

				return c;
			}

				//		#endif // UNITY_SPRITES_INCLUDED
				ENDCG
		}
	}
}

Sprites_ScrollFX.shader

// Unity buit-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)

// modified to add scrolling lines fx, use black and white mask texture for scrollingtex. - unitycoder.com
// forum topic: https://forum.unity.com/threads/can-this-2d-effect-be-created-using-shaders.1264700/

Shader "Sprites/ScrollFX"
{
	Properties
	{
		[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {}
		_ScrollTex("Scroll Texture", 2D) = "white" {}
		_Color("Tint", Color) = (1,1,1,1)
		_ScrollColor1("ScrollColor1", Color) = (1,1,1,1)
		_ScrollColor2("ScrollColor2", Color) = (0,0,0,0)
		[MaterialToggle] PixelSnap("Pixel snap", Float) = 0
		_ScrollSpeed("Scroll Speed", Float) = 1
		[HideInInspector] _RendererColor("RendererColor", Color) = (1,1,1,1)
		[HideInInspector] _Flip("Flip", Vector) = (1,1,1,1)
		[PerRendererData] _AlphaTex("External Alpha", 2D) = "white" {}
		[PerRendererData] _EnableExternalAlpha("Enable External Alpha", Float) = 0
	}

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

		Cull Off
		Lighting Off
		ZWrite Off
		Blend One OneMinusSrcAlpha

		Pass
		{
			CGPROGRAM
			#pragma vertex SpriteVert
			#pragma fragment SpriteFrag
			#pragma target 2.0
			#pragma multi_compile_instancing
			#pragma multi_compile_local _ PIXELSNAP_ON
			#pragma multi_compile _ ETC1_EXTERNAL_ALPHA
			#include "UnityCG.cginc"
			//#include "UnitySprites.cginc"

			// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)

			//#ifndef UNITY_SPRITES_INCLUDED
			//#define UNITY_SPRITES_INCLUDED
			//#include "UnityCG.cginc"
			#ifdef UNITY_INSTANCING_ENABLED

			UNITY_INSTANCING_BUFFER_START(PerDrawSprite)

		// SpriteRenderer.Color while Non-Batched/Instanced.
		UNITY_DEFINE_INSTANCED_PROP(fixed4, unity_SpriteRendererColorArray)
		// this could be smaller but that's how bit each entry is regardless of type
		UNITY_DEFINE_INSTANCED_PROP(fixed2, unity_SpriteFlipArray)
		UNITY_INSTANCING_BUFFER_END(PerDrawSprite)

		#define _RendererColor  UNITY_ACCESS_INSTANCED_PROP(PerDrawSprite, unity_SpriteRendererColorArray)
		#define _Flip           UNITY_ACCESS_INSTANCED_PROP(PerDrawSprite, unity_SpriteFlipArray)

		#endif // instancing

		CBUFFER_START(UnityPerDrawSprite)
		#ifndef UNITY_INSTANCING_ENABLED
			fixed4 _RendererColor;
			fixed2 _Flip;
		#endif
			float _EnableExternalAlpha;
		CBUFFER_END

			// Material Color.
			fixed4 _Color;

			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
			};

			inline float4 UnityFlipSprite(in float3 pos, in fixed2 flip)
			{
				return float4(pos.xy * flip, pos.z, 1.0);
			}

			v2f SpriteVert(appdata_t IN)
			{
				v2f OUT;

				UNITY_SETUP_INSTANCE_ID(IN);
				UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);

				OUT.vertex = UnityFlipSprite(IN.vertex, _Flip);
				OUT.vertex = UnityObjectToClipPos(OUT.vertex);
				OUT.texcoord = IN.texcoord;
				OUT.color = IN.color * _Color * _RendererColor;

				#ifdef PIXELSNAP_ON
				OUT.vertex = UnityPixelSnap(OUT.vertex);
				#endif

				return OUT;
			}

			sampler2D _MainTex;
			sampler2D _ScrollTex;
			sampler2D _AlphaTex;
			float _ScrollSpeed;
			fixed4 _ScrollColor1;
			fixed4 _ScrollColor2;

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

			#if ETC1_EXTERNAL_ALPHA
				fixed4 alpha = tex2D(_AlphaTex, uv);
				color.a = lerp(color.a, alpha.r, _EnableExternalAlpha);
			#endif

				return color;
			}

			fixed4 SpriteFrag(v2f IN) : SV_Target
			{
				fixed4 c = SampleSpriteTexture(IN.texcoord) * IN.color;
				fixed4 fx = tex2D(_ScrollTex, IN.texcoord+float2(_Time.x* _ScrollSpeed,0));
				c.rgb *= c.a;

				fx = lerp(_ScrollColor1, _ScrollColor2,fx.r);
				c.rgb = lerp(fx.rgb,c.rgb,1-fx.a)*c.a;

				return c;
			}

				//		#endif // UNITY_SPRITES_INCLUDED
				ENDCG
		}
	}
}