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Happsson/CornerPin.shader

Created October 12, 2017 09:08
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Revisions

  1. Happsson created this gist Oct 12, 2017.
    80 changes: 80 additions & 0 deletions CornerPin.shader
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,80 @@

    Shader "Distort/CornerPin"
    {
    Properties{
    _MainTex("Base (RGB)", 2D) = "white" {}
    _DLx("Down Left x", Range(-2.0,2.0)) = 0
    _DLy("Down Left y", Range(-2.0,2.0)) = 0

    _DRx("Down Right x", Range(-2.0,2.0)) = 0
    _DRy("Down Right y", Range(-2.0,2.0)) = 0

    _TLx("Top Left x", Range(-2.0,2.0)) = 0
    _TLy("Top Left y", Range(-2.0,2.0)) = 0

    _TRx("Top Right x", Range(-2.0,2.0)) = 0
    _TRy("Top Right y", Range(-2.0,2.0)) = 0
    }

    SubShader{
    Pass{
    ZTest Always Cull Off ZWrite Off
    Fog{ Mode off }

    CGPROGRAM
    #pragma vertex vert
    #pragma fragment frag
    #pragma fragmentoption ARB_precision_hint_fastest
    #include "UnityCG.cginc"

    uniform sampler2D _MainTex;

    struct v2f {
    float4 pos : SV_POSITION;
    float2 uv : TEXCOORD0;
    };

    float _DRx;
    float _DRy;

    float _DLx;
    float _DLy;

    float _TLx;
    float _TLy;

    float _TRx;
    float _TRy;

    v2f vert(appdata_img v)
    {
    v2f o;
    o.pos = UnityObjectToClipPos(v.vertex);
    o.uv = v.texcoord;

    o.pos.x += _DLx*o.uv.x*o.uv.y;
    o.pos.y += _DLy*o.uv.x*o.uv.y;

    o.pos.x += _DRx*(1 - o.uv.x)*o.uv.y;
    o.pos.y += _DRy*(1 - o.uv.x)*o.uv.y;

    o.pos.x += _TLx*o.uv.x*(1 - o.uv.y);
    o.pos.y += _TLy*o.uv.x*(1 - o.uv.y);

    o.pos.x += _TRx*(1 - o.uv.x)*(1 - o.uv.y);
    o.pos.y += _TRy*(1 - o.uv.x)*(1 - o.uv.y);

    return o;
    }

    float4 frag(v2f i) : SV_Target
    {


    return tex2D(_MainTex, i.uv);
    }
    ENDCG
    }
    }
    Fallback off
    }