75 lines
1.5 KiB
Plaintext
75 lines
1.5 KiB
Plaintext
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Shader "Hidden/Griffin/PainterCursor"
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{
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Properties
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{
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_Color ("Color", Color) = (0,1,1,1)
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_MainTex ("Main Texture", 2D) = "black" {}
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}
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CGINCLUDE
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#include "UnityCG.cginc"
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struct appdata
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{
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float4 vertex : POSITION;
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float2 uv : TEXCOORD0;
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};
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struct v2f
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{
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float2 uv : TEXCOORD0;
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float4 vertex : SV_POSITION;
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};
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float4 _Color;
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sampler2D _MainTex;
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float4 _MainTex_TexelSize;
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v2f vert (appdata v)
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{
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v2f o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.uv = v.uv;
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return o;
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}
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float Stripe(in float x, in float stripeX, in float pixelWidth)
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{
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// compute derivatives to get ddx / pixel
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float2 derivatives = float2(ddx(x), ddy(x));
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float derivLen = length(derivatives);
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float sharpen = 1.0f / max(derivLen, 0.00001f);
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return saturate(0.5f + 0.5f * (0.5f * pixelWidth - sharpen * abs(x - stripeX)));
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}
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fixed4 frag (v2f i) : SV_Target
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{
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float texGray = tex2D(_MainTex, i.uv).r;
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float stripeWidth = 2.0f; // pixels
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float stripeLocation = 0.05f; // at 5% alpha
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float brushStripe = Stripe(texGray, stripeLocation, stripeWidth);
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float4 color = _Color;
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color.a = _Color.a*texGray*(brushStripe<0.5) + _Color*(brushStripe>=0.5);
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return color;
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}
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ENDCG
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SubShader
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{
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Tags { "Queue"="Overlay" "RenderType"="Transparent" }
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Pass
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{
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Blend SrcAlpha OneMinusSrcAlpha
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BlendOp Add
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ZTest Off
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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ENDCG
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}
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}
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}
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