100 lines
3.4 KiB
Plaintext
100 lines
3.4 KiB
Plaintext
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// This shader draws a texture on the mesh.
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Shader "custom/julia"
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{
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// The _BaseMap variable is visible in the Material's Inspector, as a field
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// called Base Map.
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Properties
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{
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_Color1("Color 1", Color) = (1,1,1,1)
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_Color2("Color 2", Color) = (1,1,1,1)
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_BassPower("Bass Power", Float) = 0.0
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_Fractality("Fractality", Float) = 1.02
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}
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SubShader
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{
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Tags { "RenderType" = "Opaque" "RenderPipeline" = "UniversalRenderPipeline" }
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Pass
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{
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HLSLPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
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struct Attributes
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{
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float4 positionOS : POSITION;
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// The uv variable contains the UV coordinate on the texture for the
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// given vertex.
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float2 uv : TEXCOORD0;
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};
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struct Varyings
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{
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float4 positionHCS : SV_POSITION;
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// The uv variable contains the UV coordinate on the texture for the
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// given vertex.
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float2 uv : TEXCOORD0;
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};
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float4 _Color1;
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float4 _Color2;
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float _Fractality;
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float _BassAmplitude;
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// This macro declares _BaseMap as a Texture2D object.
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TEXTURE2D(_BaseMap);
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// This macro declares the sampler for the _BaseMap texture.
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SAMPLER(sampler_BaseMap);
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CBUFFER_START(UnityPerMaterial)
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// The following line declares the _BaseMap_ST variable, so that you
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// can use the _BaseMap variable in the fragment shader. The _ST
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// suffix is necessary for the tiling and offset function to work.
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float4 _BaseMap_ST;
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CBUFFER_END
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Varyings vert(Attributes IN)
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{
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Varyings OUT;
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OUT.positionHCS = TransformObjectToHClip(IN.positionOS.xyz);
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// The TRANSFORM_TEX macro performs the tiling and offset
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// transformation.
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OUT.uv = TRANSFORM_TEX(IN.uv, _BaseMap);
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return OUT;
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}
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half4 frag(Varyings IN) : SV_Target
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{
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// calculate pixel
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float2 res = _ScreenParams;
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float2 p = -1.0+2.0*IN.positionHCS.xy/res.xy;
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float2 z = p * 1.5;
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float2 c;
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float an = _Time + _BassAmplitude;
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c.x = 0.5*cos(an) - 0.25*cos(2.0*an);
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c.y = 0.5*sin(an) - 0.25*sin(2.0*an);
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c *= _Fractality;
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float t = 0.0;
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int iterations = 64;
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for (int i = 0; i < iterations; ++i)
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{
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float2 nz = float2(z.x*z.x-z.y*z.y,2.0*z.x*z.y) + c;
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float m2 = dot(nz,nz);
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if (m2 > 4.0) break;
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z = nz;
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t+= 1.0 / (iterations-1.0);
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}
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return lerp(_Color1,_Color2,t);
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}
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ENDHLSL
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}
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}
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}
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