559800f494
Ports of Blender v5.2.2's intern/cycles kernel functions, one function per node operation, with the HLSL mirror, the Unity copy, the lowering table entry for a separate Apache-2.0 GLSL file, the golden-fixture families, the package licence expressions and the notices section. Builds. Does not pass yet: CultMath.Cycles.glsl and the regenerated golden fixture arrive in a later commit, so CommittedGlslEqualsLowering and GoldenFixtureMatchesCSharp fail at this commit. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
74 lines
4.1 KiB
Markdown
74 lines
4.1 KiB
Markdown
# Third-Party Notices
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## 2D and 3D Simplex Noise
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`math.snoise` and `cultmath_snoise` port the textureless 2D and 3D
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simplex-noise functions by Ian McEwan and Ashima Arts, as distributed by Stefan
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Gustavson's `webgl-noise` project and Unity Mathematics.
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`math.snoise(float3)` and `cultmath_snoise(float3)` follow `src/noise3D.glsl` and
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`math.snoise(float2)` follows `src/noise2D.glsl` of stegu/webgl-noise at commit
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`22434e04d7753f7e949e8d724ab3da2864c17a0f` (the simplex-boundary fix is
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`21d9fe23d7`, scale `ff3b5d34ea`, permutation `a3e6d57095`). Modified from upstream:
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the 3D corner tie order follows Gustavson's `simplexnoise1234`, because the
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upstream `step` compares are cyclic where the offset's components are equal.
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`math.snoise_grad`/`cultmath_snoise_grad` (and the `fbm_grad`/`ridged_grad`
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octave sums built on them) follow the analytic-gradient differentiation from
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the same project's `src/noise3Dgrad.glsl`, with the same kernel radius,
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permutation and scale as `snoise(float3)`.
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- Copyright 2011 Ashima Arts.
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- Upstream: <https://github.com/ashima/webgl-noise>
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- License: MIT.
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## Cycles node semantics
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`math.cycles_*` and `cultmath_cycles_*` port what Blender's Cycles renderer
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computes for the Math, Map Range, Clamp, Mix and RGB to BW nodes and for a Color
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Ramp lookup. Each function's comment names the Cycles file it follows, all from
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`intern/cycles` at the Blender `v5.2.2` tag: `kernel/svm/math_util.h`,
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`kernel/svm/map_range.h`, `kernel/svm/clamp.h`, `kernel/svm/mix.h`,
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`kernel/svm/color_util.h`, `kernel/svm/ramp.h`, `kernel/svm/convert.h`,
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`util/math_base.h`, `util/math_float3.h` and `util/color.h`. The code was
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changed: Cycles C++ became C# and HLSL, one function per node operation, with
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the nodes' socket defaults and clamp options left to the caller, and the modulo
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is the quotient form every CultMath target shares rather than `fmodf`. Nothing
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was read from Blender's GPL sources (`source/blender/gpu`, `source/blender/blenlib`).
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- Copyright 2011-2022 Blender Foundation.
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- Upstream: <https://projects.blender.org/blender/blender> (`intern/cycles`).
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- License: Apache-2.0 (<https://www.apache.org/licenses/LICENSE-2.0>), which is
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per-file here: it covers `src/CultMath/math.Cycles.cs`,
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`shaders/CultMath.Cycles.hlsl` and the Unity copy of that include, and
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`shaders/CultMath.Cycles.glsl`, which is generated from that include. Each
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carries the Apache-2.0 header and this attribution. The rest of CultMath, the
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generated GLSL library included, is MIT or MPL-2.0 as above, so the
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`GameCult.Math` NuGet package and the `org.gamecult.cultmath` Unity package
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both declare `MIT AND MPL-2.0 AND Apache-2.0` and ship this file.
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- The test fixtures under `tests/CultMath.Tests/fixtures/cycles-oracle` are
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results of running Blender 5.2.2 through `tools/cycles-oracle/oracle.py`
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(GPL-3.0-or-later, a Blender Python script, shipped neither in the NuGet
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package nor in the Unity package).
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## Phacelle Noise
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`math.phacelle` and `cultmath_phacelle` follow Rune Skovbo Johansen's Phacelle
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noise (Shadertoy `t3dyWl`; erosion filter `wXcfWn`; blog, March 2026), read
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from the C# port `PhacelleNoise` in `lpmitchell/AdvancedTerrainErosion`
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(`AdvancedTerrainErosion.cs`, converted to burstable C# by Luke Mitchell,
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2026). The cell weight, the phase blend and the normalization follow it. The
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3D-cell generalisation, the caller-supplied stripe wave vector, the exact
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gradient and the exact pruning are new here.
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- Copyright (c) 2025 Rune Skovbo Johansen.
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- Upstream: <https://github.com/lpmitchell/AdvancedTerrainErosion>
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- License: MPL-2.0 (<https://mozilla.org/MPL/2.0/>). MPL-2.0 is file-level, so it
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covers exactly the files that carry the port and nothing else:
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`src/CultMath/math.Phacelle.cs`, `src/CultMath/CultPhasor.cs`,
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`shaders/CultMath.Phacelle.hlsl` and the Unity copy of that include, and
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`shaders/CultMath.Phacelle.glsl`, which is generated from that include. Each
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carries the MPL-2.0 header and this attribution. The rest of CultMath, the
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generated GLSL library included, is MIT, so the `GameCult.Math` NuGet
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package and the `org.gamecult.cultmath` Unity package both declare
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`MIT AND MPL-2.0` and ship this file.
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