116 lines
2.9 KiB
Plaintext
116 lines
2.9 KiB
Plaintext
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Shader "Custom/LightRays"{
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Properties{
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_MainTex("Texture",2D)="white"{}
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_Color1("Color1",Color)=(0.1,1,1,1)
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_Color2("Color2",Color)=(0,0.46,1,0)
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_Speed("Speed",Range(0,5.0))=0.5
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_Size("Size",Range(1.0,30.0))=15.0
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_Skew("Skew",Range(-1.0,1.0))=0.5
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_Shear("Shear",Range(0.0,5.0))=1.0
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_Fade("Fade",Range(0.0,1.0))=1.0
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_Contrast("Contrast",Range(0.0,50.0))=1.0
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}
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SubShader{
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Tags{
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"Queue"="Transparent"
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"IgnoreProjector"="True"
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"RenderType"="Transparent"
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"PreviewType"="Plane"
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}
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Cull Off
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Lighting Off
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ZWrite Off
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Fog {Mode Off}
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Blend SrcAlpha OneMinusSrcAlpha
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Pass{
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CGPROGRAM
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#pragma vertex vert_img
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#pragma fragment frag
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#include "UnityCG.cginc"
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float4 permute(float4 x){
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return fmod(34.0*pow(x,2)+x,289.0);
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}
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float2 fade(float2 t){
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return 6.0*pow(t,5.0)-15.0*pow(t,4.0)+10.0*pow(t,3.0);
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}
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float4 taylorInvSqrt(float4 r){
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return 1.79284291400159-0.85373472095314*r;
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}
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#define DIV_289 0.00346020761245674740484429065744f
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float mod289(float x){
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return x-floor(x*DIV_289)*289.0;
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}
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#define REPEAT_Y 1000.0
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float PerlinNoise2D(float2 P){
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//Mirror the pattern on large Y number
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if(floor(P.y/REPEAT_Y)%2==0){
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P.y-=floor(P.y/REPEAT_Y)*REPEAT_Y;
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}else{
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P.y-=floor(P.y/REPEAT_Y)*REPEAT_Y;
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P.y=REPEAT_Y-P.y;
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}
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float4 Pi=floor(P.xyxy)+float4(0.0,0.0,1.0,1.0);
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float4 Pf=frac(P.xyxy)-float4(0.0,0.0,1.0,1.0);
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float4 ix=Pi.xzxz;
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float4 iy=Pi.yyww;
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float4 fx=Pf.xzxz;
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float4 fy=Pf.yyww;
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float4 i=permute(permute(ix)+iy);
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float4 gx=frac(i/41.0)*2.0-1.0;
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float4 gy=abs(gx)-0.5;
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float4 tx=floor(gx+0.5);
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gx=gx-tx;
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float2 g00=float2(gx.x,gy.x);
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float2 g10=float2(gx.y,gy.y);
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float2 g01=float2(gx.z,gy.z);
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float2 g11=float2(gx.w,gy.w);
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float4 norm=taylorInvSqrt(float4(dot(g00,g00),dot(g01,g01),dot(g10,g10),dot(g11,g11)));
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g00*=norm.x;
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g01*=norm.y;
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g10*=norm.z;
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g11*=norm.w;
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float n00=dot(g00,float2(fx.x,fy.x));
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float n10=dot(g10,float2(fx.y,fy.y));
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float n01=dot(g01,float2(fx.z,fy.z));
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float n11=dot(g11,float2(fx.w,fy.w));
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float2 fade_xy=fade(Pf.xy);
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float2 n_x=lerp(float2(n00, n01),float2(n10, n11),fade_xy.x);
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float n_xy=lerp(n_x.x,n_x.y,fade_xy.y);
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return 2.3*n_xy;
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}
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fixed4 _Color1;
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fixed4 _Color2;
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float _Speed;
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float _Size;
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float _Skew;
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float _Shear;
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float _Fade;
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float _Contrast;
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fixed4 frag(v2f_img i):SV_Target{
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fixed4 color=lerp(_Color1,_Color2,1-i.uv.y);
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fixed noisePos=i.uv.x;
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noisePos+=-0.5;
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noisePos*=_Size;
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noisePos+=(1-i.uv.y)*(_Size*_Skew);
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noisePos*=1/lerp(1,_Shear,1-i.uv.y);
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fixed val=PerlinNoise2D(float2(noisePos,_Time.y*_Speed))/2 + 0.5f;
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val=_Contrast*(val-0.5)+0.5;
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color.a*=lerp(val,val*i.uv.y,_Fade);
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color.a=clamp(color.a,0.0,1.0);
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return color;
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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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