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Shader/Include.meta

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Shader/Include/ClassicNoise3D.hlsl

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+#include "Packages/com.misaki.art-tools/Shader/Include/Common/NoiseCommon.hlsl"
+
+float ClassicNoise_impl(float3 pi0, float3 pf0, float3 pi1, float3 pf1)
+{
+    pi0 = wglnoise_mod289(pi0);
+    pi1 = wglnoise_mod289(pi1);
+
+    float4 ix = float4(pi0.x, pi1.x, pi0.x, pi1.x);
+    float4 iy = float4(pi0.y, pi0.y, pi1.y, pi1.y);
+    float4 iz0 = pi0.z;
+    float4 iz1 = pi1.z;
+
+    float4 ixy = wglnoise_permute(wglnoise_permute(ix) + iy);
+    float4 ixy0 = wglnoise_permute(ixy + iz0);
+    float4 ixy1 = wglnoise_permute(ixy + iz1);
+
+    float4 gx0 = lerp(-1, 1, frac(floor(ixy0 / 7) / 7));
+    float4 gy0 = lerp(-1, 1, frac(floor(ixy0 % 7) / 7));
+    float4 gz0 = 1 - abs(gx0) - abs(gy0);
+
+    bool4 zn0 = gz0 < -0.01;
+    gx0 += zn0 * (gx0 < -0.01 ? 1 : -1);
+    gy0 += zn0 * (gy0 < -0.01 ? 1 : -1);
+
+    float4 gx1 = lerp(-1, 1, frac(floor(ixy1 / 7) / 7));
+    float4 gy1 = lerp(-1, 1, frac(floor(ixy1 % 7) / 7));
+    float4 gz1 = 1 - abs(gx1) - abs(gy1);
+
+    bool4 zn1 = gz1 < -0.01;
+    gx1 += zn1 * (gx1 < -0.01 ? 1 : -1);
+    gy1 += zn1 * (gy1 < -0.01 ? 1 : -1);
+
+    float3 g000 = normalize(float3(gx0.x, gy0.x, gz0.x));
+    float3 g100 = normalize(float3(gx0.y, gy0.y, gz0.y));
+    float3 g010 = normalize(float3(gx0.z, gy0.z, gz0.z));
+    float3 g110 = normalize(float3(gx0.w, gy0.w, gz0.w));
+    float3 g001 = normalize(float3(gx1.x, gy1.x, gz1.x));
+    float3 g101 = normalize(float3(gx1.y, gy1.y, gz1.y));
+    float3 g011 = normalize(float3(gx1.z, gy1.z, gz1.z));
+    float3 g111 = normalize(float3(gx1.w, gy1.w, gz1.w));
+
+    float n000 = dot(g000, pf0);
+    float n100 = dot(g100, float3(pf1.x, pf0.y, pf0.z));
+    float n010 = dot(g010, float3(pf0.x, pf1.y, pf0.z));
+    float n110 = dot(g110, float3(pf1.x, pf1.y, pf0.z));
+    float n001 = dot(g001, float3(pf0.x, pf0.y, pf1.z));
+    float n101 = dot(g101, float3(pf1.x, pf0.y, pf1.z));
+    float n011 = dot(g011, float3(pf0.x, pf1.y, pf1.z));
+    float n111 = dot(g111, pf1);
+
+    float3 fade_xyz = wglnoise_fade(pf0);
+    float4 n_z = lerp(float4(n000, n100, n010, n110),
+                      float4(n001, n101, n011, n111), fade_xyz.z);
+    float2 n_yz = lerp(n_z.xy, n_z.zw, fade_xyz.y);
+    float n_xyz = lerp(n_yz.x, n_yz.y, fade_xyz.x);
+    return 1.46 * n_xyz;
+}
+
+// Classic Perlin noise
+float ClassicNoise(float3 p)
+{
+    float3 i = floor(p);
+    float3 f = frac(p);
+    return ClassicNoise_impl(i, f, i + 1, f - 1);
+}
+
+// Classic Perlin noise, periodic variant
+float PeriodicNoise(float3 p, float3 rep)
+{
+    float3 i0 = wglnoise_mod(floor(p), rep);
+    float3 i1 = wglnoise_mod(i0 + 1, rep);
+    float3 f = frac(p);
+    return ClassicNoise_impl(i0, f, i1, f - 1);
+}
+
+float NoiseFBM(float3 p, float octaves, float lacunarity, float gain)
+{
+    float sum = 0;
+    float amp = 1;
+    float freq = 1;
+    for (int i = 0; i < octaves; i++)
+    {
+        sum += ClassicNoise(p * freq) * amp;
+        freq *= lacunarity;
+        amp *= gain;
+    }
+    return sum;
+}
+
+// ShaderGraph function
+void ClassicNoise_float(float3 p, out float Out)
+{
+    Out = ClassicNoise(p);
+
+}
+
+void PeriodicNoise_float(float3 p, float3 rep, out float Out)
+{
+    Out = PeriodicNoise(p, rep);
+}
+
+void NoiseFBM_float(float3 p, float octaves, float lacunarity, float gain, out float Out)
+{
+    Out = NoiseFBM(p, octaves, lacunarity, gain);
+}

Shader/Include/ClassicNoise3D.hlsl.meta

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Shader/Include/Common.meta

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Shader/Include/Common/NoiseCommon.hlsl

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+float wglnoise_mod(float x, float y)
+{
+    return x - y * floor(x / y);
+}
+
+float2 wglnoise_mod(float2 x, float2 y)
+{
+    return x - y * floor(x / y);
+}
+
+float3 wglnoise_mod(float3 x, float3 y)
+{
+    return x - y * floor(x / y);
+}
+
+float4 wglnoise_mod(float4 x, float4 y)
+{
+    return x - y * floor(x / y);
+}
+
+float2 wglnoise_fade(float2 t)
+{
+    return t * t * t * (t * (t * 6 - 15) + 10);
+}
+
+float3 wglnoise_fade(float3 t)
+{
+    return t * t * t * (t * (t * 6 - 15) + 10);
+}
+
+float wglnoise_mod289(float x)
+{
+    return x - floor(x / 289) * 289;
+}
+
+float2 wglnoise_mod289(float2 x)
+{
+    return x - floor(x / 289) * 289;
+}
+
+float3 wglnoise_mod289(float3 x)
+{
+    return x - floor(x / 289) * 289;
+}
+
+float4 wglnoise_mod289(float4 x)
+{
+    return x - floor(x / 289) * 289;
+}
+
+float3 wglnoise_permute(float3 x)
+{
+    return wglnoise_mod289((x * 34 + 1) * x);
+}
+
+float4 wglnoise_permute(float4 x)
+{
+    return wglnoise_mod289((x * 34 + 1) * x);
+}

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