Merge CultMath 0.3.0 release (Asura 2a-ii-c)

snoise moves to the upstream kernel (breaking values, minor bump for 0.y),
smin_grad, cellular, snoise/fbm/ridged gradients, Phacelle, BoundedLeastSquares.
Unity package licence is MIT AND MPL-2.0. Soul holds: asura:verdict:cut-2a-ii-c.s3.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/cultmath/THIRD-PARTY-NOTICES.md

@@ -37,5 +37,5 @@ gradient and the exact pruning are new here.
   `src/CultMath/math.Phacelle.cs`, `src/CultMath/CultPhasor.cs`,
   `shaders/CultMath.Phacelle.hlsl` and the Unity copy of that include. Each
   carries the MPL-2.0 header and this attribution. The rest of CultMath is MIT,
-  so the `GameCult.Math` NuGet package declares `MIT AND MPL-2.0` and ships this
-  file. The Unity package as a whole is MPL-2.0.
+  so the `GameCult.Math` NuGet package and the `org.gamecult.cultmath` Unity
+  package both declare `MIT AND MPL-2.0` and ship this file.

packages/cultmath/src/CultMath/CultMath.csproj

@@ -10,7 +10,7 @@
     <PackageId>GameCult.Math</PackageId>
     <!-- MIT overall; math.Phacelle.cs and CultPhasor.cs (and the two Phacelle HLSL files) are MPL-2.0. -->
     <PackageLicenseExpression>MIT AND MPL-2.0</PackageLicenseExpression>
-    <Version>0.2.4</Version>
+    <Version>0.3.0</Version>
     <Description>Clean-room C# math shaped for HLSL-style renderer code.</Description>
     <Authors>GameCult</Authors>
     <PackageReadmeFile>README.md</PackageReadmeFile>

packages/cultmath/unity/org.gamecult.cultmath/CHANGELOG.md

@@ -5,6 +5,38 @@ All notable changes to this package are documented in this file.
 Earlier releases (0.2.0-0.2.3) predate this package's changelog and are not
 backfilled here; see `docs/semver-policy.md` for why.
 
+## [0.3.0]
+
+### Breaking
+
+- `math.snoise(float3)` and `math.snoise(float2)`, and their HLSL mirrors
+  `cultmath_snoise`, return different values. The kernel now follows
+  stegu/webgl-noise. For 3D only, the falloff `r^2` constant is 0.5 (was 0.6)
+  and the output scale is 105 (was 42). For 2D, the falloff constant (0.5) and
+  the output scale (130) are unchanged. In both, the shared permutation offset
+  is now +10 (was +1), which changes the values of both. This removes the value
+  discontinuities the 3D kernel had at simplex cell boundaries. Any content
+  seeded from `snoise` changes; regenerate it when you take this version.
+
+### Added
+
+- `math.smin_grad`: smooth minimum with gradient, for `float4` operands
+  carrying the gradient in `xyz` and the value in `w`.
+- `math.cellular` and the `CultCellular` result struct: cellular (Worley)
+  noise returning the gradient and distance to the nearest feature points.
+- `math.snoise_grad`, `math.fbm_grad` and `math.ridged_grad`: simplex noise,
+  fractal Brownian motion and ridged multifractal with analytic gradients,
+  returned as `float4` with the gradient in `xyz` and the value in `w`.
+- `math.phacelle` and the `CultPhasor` result struct: Phacelle noise with
+  gradient. `math.Phacelle.cs`, `CultPhasor.cs` and
+  `Shaders/CultMath.Phacelle.hlsl` are MPL-2.0 (see
+  `THIRD-PARTY-NOTICES.md`).
+- `BoundedLeastSquares`: an allocation-free, deterministic bounded
+  least-squares solver (`Solve`) with a status result and the input contract
+  documented on the type.
+- The matching `cultmath_*` HLSL mirrors of the functions above in
+  `Shaders/CultMath.hlsl` and `Shaders/CultMath.Phacelle.hlsl`.
+
 ## [0.2.4]
 
 ### Added

packages/cultmath/unity/org.gamecult.cultmath/LICENSE.md

@@ -1,8 +1,17 @@
 # CultMath License
 
-CultMath is licensed under the Mozilla Public License 2.0 (`MPL-2.0`).
+CultMath is licensed under the MIT License (`MIT`), except for the Phacelle
+files, which are licensed under the Mozilla Public License 2.0 (`MPL-2.0`):
 
-The complete license text is available from the Mozilla Foundation at
+- `Shaders/CultMath.Phacelle.hlsl`
+- the Phacelle sources compiled into `Runtime/Plugins/CultMath.dll`
+  (`math.Phacelle.cs` and `CultPhasor.cs` in the GameCult/CultLib repository)
+
+The package license expression is therefore `MIT AND MPL-2.0`, matching the
+`GameCult.Math` NuGet package. MPL-2.0 is file-level: it applies to those files
+and not to the rest of CultMath.
+
+The MPL-2.0 text is available from the Mozilla Foundation at
 <https://www.mozilla.org/MPL/2.0/>. Source and modification history for the
 precompiled assembly in this package are available in the GameCult/CultLib
 repository (`packages/cultmath`) at the corresponding package tag.

packages/cultmath/unity/org.gamecult.cultmath/THIRD-PARTY-NOTICES.md

@@ -37,5 +37,5 @@ gradient and the exact pruning are new here.
   `src/CultMath/math.Phacelle.cs`, `src/CultMath/CultPhasor.cs`,
   `shaders/CultMath.Phacelle.hlsl` and the Unity copy of that include. Each
   carries the MPL-2.0 header and this attribution. The rest of CultMath is MIT,
-  so the `GameCult.Math` NuGet package declares `MIT AND MPL-2.0` and ships this
-  file. The Unity package as a whole is MPL-2.0.
+  so the `GameCult.Math` NuGet package and the `org.gamecult.cultmath` Unity
+  package both declare `MIT AND MPL-2.0` and ship this file.

packages/cultmath/unity/org.gamecult.cultmath/package.json

@@ -1,10 +1,10 @@
 {
   "name": "org.gamecult.cultmath",
   "displayName": "CultMath",
-  "version": "0.2.4",
+  "version": "0.3.0",
   "unity": "2021.3",
   "description": "Precompiled CultMath numeric primitives and matching HLSL semantics for GameCult Unity runtimes.",
-  "license": "MPL-2.0",
+  "license": "MIT AND MPL-2.0",
   "author": {
     "name": "GameCult"
   },