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diff --git a/source/blender/blenlib/BLI_noise.hh b/source/blender/blenlib/BLI_noise.hh
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+++ b/source/blender/blenlib/BLI_noise.hh
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+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#pragma once
+
+#include "BLI_float2.hh"
+#include "BLI_float3.hh"
+#include "BLI_float4.hh"
+
+namespace blender::noise {
+
+/* Perlin noise in the range [-1, 1]. */
+
+float perlin_signed(float position);
+float perlin_signed(float2 position);
+float perlin_signed(float3 position);
+float perlin_signed(float4 position);
+
+/* Perlin noise in the range [0, 1]. */
+
+float perlin(float position);
+float perlin(float2 position);
+float perlin(float3 position);
+float perlin(float4 position);
+
+/* Fractal perlin noise in the range [0, 1]. */
+
+float perlin_fractal(float position, float octaves, float roughness);
+float perlin_fractal(float2 position, float octaves, float roughness);
+float perlin_fractal(float3 position, float octaves, float roughness);
+float perlin_fractal(float4 position, float octaves, float roughness);
+
+/* Positive distorted fractal perlin noise. */
+
+float perlin_fractal_distorted(float position, float octaves, float roughness, float distortion);
+float perlin_fractal_distorted(float2 position, float octaves, float roughness, float distortion);
+float perlin_fractal_distorted(float3 position, float octaves, float roughness, float distortion);
+float perlin_fractal_distorted(float4 position, float octaves, float roughness, float distortion);
+
+/* Positive distorted fractal perlin noise that outputs a float3. */
+
+float3 perlin_float3_fractal_distorted(float position,
+                                       float octaves,
+                                       float roughness,
+                                       float distortion);
+float3 perlin_float3_fractal_distorted(float2 position,
+                                       float octaves,
+                                       float roughness,
+                                       float distortion);
+float3 perlin_float3_fractal_distorted(float3 position,
+                                       float octaves,
+                                       float roughness,
+                                       float distortion);
+float3 perlin_float3_fractal_distorted(float4 position,
+                                       float octaves,
+                                       float roughness,
+                                       float distortion);
+
+}  // namespace blender::noise