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unitycoder/marching-ants-outline.shader

Created December 19, 2018 18:55
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  1. unitycoder created this gist Dec 19, 2018.
    218 changes: 218 additions & 0 deletions marching-ants-outline.shader
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    Original file line number Diff line number Diff line change
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    // original source: https://github.com/wlgys8/Sprites-Outline

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

    // Add values to determine if outlining is enabled and outline color.
    [PerRendererData] _OutlineSize ("Outline", Float) = 0
    [PerRendererData] _OutlineColor("Outline Color", Color) = (1,1,1,1)
    }

    CGINCLUDE
    #include "UnityCG.cginc"

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

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

    v2f vert_outline(appdata_t IN)
    {
    v2f 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;

    float4 _MainTex_TexelSize; //magic var
    float _OutlineSize; //outline size
    fixed4 _OutlineColor; // outlie color

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

    ENDCG

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

    Cull Off
    Lighting Off
    ZWrite Off
    Blend One OneMinusSrcAlpha

    //outline down
    Pass
    {
    Offset 1, 1

    CGPROGRAM
    #pragma vertex vert
    #pragma fragment frag
    #pragma multi_compile _ PIXELSNAP_ON
    #pragma shader_feature ETC1_EXTERNAL_ALPHA

    v2f vert(appdata_t IN)
    {
    return vert_outline(IN);
    }

    fixed4 frag(v2f IN) : SV_Target
    {
    fixed4 texColor = SampleSpriteTexture (IN.texcoord + fixed2(0,_MainTex_TexelSize.y*_OutlineSize)) * IN.color;
    fixed4 c = _OutlineColor * texColor.a;
    int w = ((int)(IN.texcoord.x * 100 + IN.texcoord.y * 100 + _Time.y * 5) & 1);
    return c*w;
    }
    ENDCG
    }

    //outline up
    Pass
    {
    Offset 1, 1

    CGPROGRAM
    #pragma vertex vert
    #pragma fragment frag
    #pragma multi_compile _ PIXELSNAP_ON
    #pragma shader_feature ETC1_EXTERNAL_ALPHA

    v2f vert(appdata_t IN)
    {
    return vert_outline(IN);
    }

    fixed4 frag(v2f IN) : SV_Target
    {

    fixed4 texColor = SampleSpriteTexture (IN.texcoord + fixed2(0,- _MainTex_TexelSize.y* _OutlineSize)) * IN.color;
    fixed4 c = _OutlineColor * texColor.a;
    int w = ((int)(IN.texcoord.x * 100 + IN.texcoord.y * 100 + _Time.y * 5) & 1);
    return c*w;
    }
    ENDCG
    }

    //outline left
    Pass
    {
    Offset 1, 1

    CGPROGRAM
    #pragma vertex vert
    #pragma fragment frag
    #pragma multi_compile _ PIXELSNAP_ON
    #pragma shader_feature ETC1_EXTERNAL_ALPHA

    v2f vert(appdata_t IN)
    {
    return vert_outline(IN);
    }

    fixed4 frag(v2f IN) : SV_Target
    {

    fixed4 texColor = SampleSpriteTexture (IN.texcoord + fixed2(_MainTex_TexelSize.x* _OutlineSize,0)) * IN.color;
    fixed4 c = _OutlineColor * texColor.a;
    int w = ((int)(IN.texcoord.x * 100 + IN.texcoord.y * 100 + _Time.y * 5) & 1);
    return c * w;
    }
    ENDCG
    }

    //outline right
    Pass
    {
    Offset 1, 1

    CGPROGRAM
    #pragma vertex vert
    #pragma fragment frag
    #pragma multi_compile _ PIXELSNAP_ON
    #pragma shader_feature ETC1_EXTERNAL_ALPHA

    v2f vert(appdata_t IN)
    {
    return vert_outline(IN);
    }

    fixed4 frag(v2f IN) : SV_Target
    {

    fixed4 texColor = SampleSpriteTexture (IN.texcoord + fixed2(-_MainTex_TexelSize.x* _OutlineSize,0)) * IN.color;
    fixed4 c = _OutlineColor * texColor.a;
    int w = ((int)(IN.texcoord.x * 100 + IN.texcoord.y * 100 + _Time.y * 5) & 1);
    return c * w;
    }
    ENDCG
    }
    //
    Pass
    {
    Offset 0, 0

    CGPROGRAM
    #pragma vertex vert
    #pragma fragment frag
    #pragma multi_compile _ PIXELSNAP_ON
    #pragma shader_feature ETC1_EXTERNAL_ALPHA

    v2f vert(appdata_t IN)
    {
    v2f 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;
    }


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