73 lines
1.2 KiB
GLSL
73 lines
1.2 KiB
GLSL
Shader "CrispyPin/elementary_ca"
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{
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Properties
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{
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[NoScaleOffset]
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_LastFrame ("Render texture", 2D) = "white" {}
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_Rule("Rule", Integer) = 110
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}
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SubShader
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{
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Tags { "RenderType"="Opaque" }
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LOD 100
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "UnityCG.cginc"
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#define WIDTH 256
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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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texture2D _LastFrame;
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int _Rule;
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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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inline int state(uint2 p, int dx, int dy)
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{
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const uint x = (p.x + dx) % WIDTH;
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const uint y = (p.y + dy) % WIDTH;
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return _LastFrame[uint2(x, y)].b > 0.1;
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}
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float3 frag (v2f i) : SV_Target
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{
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if(_ProjectionParams.z > 1) discard;
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const uint2 p = i.uv * WIDTH;
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if (p.y == WIDTH-1) {
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return state(p, 0, 0);
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}
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int permutation =
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(state(p, -1, 1) << 2) |
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(state(p, 0, 1) << 1) |
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state(p, 1, 1);
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float next = (_Rule >> permutation) & 1;
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return float3(i.uv * next, next * (_SinTime.y * 0.4 + 0.6));
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}
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ENDCG
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}
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}
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}
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