67 lines
1.6 KiB
Plaintext
67 lines
1.6 KiB
Plaintext
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Shader "VolumetricFog2/Turbulence2D"
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{
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Properties {
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_MainTex ("Noise", 2D) = "white" {}
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_TurbulenceAmount ("Turbulence Amount", Float) = 0.5
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}
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SubShader {
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CGINCLUDE
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#include "UnityCG.cginc"
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struct appdata {
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float4 vertex : POSITION;
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float2 texcoord : TEXCOORD0;
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};
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struct v2f {
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float4 pos : SV_POSITION;
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float4 uv: TEXCOORD0;
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};
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sampler2D_float _MainTex;
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float _TurbulenceAmount;
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float _NoiseStrength, _NoiseFinalMultiplier;
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v2f vert(appdata v) {
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v2f o;
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o.pos = UnityObjectToClipPos(v.vertex);
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o.uv = float4(v.texcoord, 0, 0);
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return o;
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}
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float4 frag(v2f i): SV_Target {
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float sint, cost;
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sincos(_TurbulenceAmount, sint, cost);
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float4 p0 = tex2Dlod(_MainTex, i.uv);
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float4 p1 = tex2Dlod(_MainTex, i.uv + float4(0.25,0.25,0,0));
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float t0 = sint * 0.5 + 0.5;
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float4 r0 = lerp(p0, p1, t0);
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float4 p2 = tex2Dlod(_MainTex, i.uv + float4(0.5,0.5,0,0));
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float4 p3 = tex2Dlod(_MainTex, i.uv + float4(0.75,0.75,0,0));
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float t1 = cost * 0.5 + 0.5;
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float4 r1 = lerp(p2, p3, t1);
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float n = 1.0 - max(r0, r1);
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n = saturate( (1.0 - n * _NoiseStrength) * _NoiseFinalMultiplier);
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return n;
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}
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ENDCG
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Pass {
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ZTest Always Cull Off ZWrite Off
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CGPROGRAM
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#pragma target 3.0
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#pragma fragmentoption ARB_precision_hint_fastest
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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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Fallback Off
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}
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