refactor(noise): fix naming issues / file organisation

[PottierLoic]

This PR cleans up some naming issues that slipped through when I added Perlin and Simplex noise.

Some functions were named like noisetype_dimension, while others used noisetypedimensions without underscore. It got a bit confusing, so I’ve fixed everything to be consistent now.

I also combined the perlin_2d and perlin_3d files into a single perlin file to match how the Simplex code is organized. Same thing for the test files.

Summary by CodeRabbit

• New Features

  • Introduced Perlin noise generation functions for 2D and 3D coordinates.
  • Added a setup function for initializing the random number generator.
  • Added test functions for validating Perlin noise generation.

• Bug Fixes

  • Updated parameter naming for clarity in various methods.

• Chores

  • Removed outdated Perlin noise modules and their corresponding test files.
  • Renamed gradient functions for consistency across the noise generation module.
  • Updated expected output values in test functions for accuracy.

[coderabbitai[bot]]

Walkthrough

The changes in this pull request involve modifications to the noise module, primarily focusing on renaming parameters and functions for clarity. The Generator struct's randomize method parameter was renamed from generator to gen. Additionally, new functions for 2D and 3D Perlin noise generation were introduced, while previous implementations of 2D and 3D Perlin noise were removed. The simplex module also underwent similar renaming changes, ensuring consistency across the codebase.

Changes

File	Change Summary
noise/noise.v	Renamed generator parameter to gen in randomize method. Added functions for Perlin noise: perlin_2d, perlin_3d, perlin_grad_2d, perlin_grad_3d, lerp, fade.
noise/perlin.v	New file implementing Perlin noise generation functions for 2D and 3D coordinates.
noise/perlin2d.v	Deleted file containing 2D Perlin noise generation function and associated helpers.
noise/perlin2d_test.v	Deleted test file for the 2D Perlin noise generator.
noise/perlin3d.v	Deleted file containing 3D Perlin noise generation function and associated helpers.
noise/perlin3d_test.v	Deleted test file for the 3D Perlin noise generator.
noise/perlin_test.v	New test module added with functions for testing 2D and 3D Perlin noise generation.
noise/simplex.v	Renamed gradient functions and updated Generator parameter name to gen in simplex functions.
noise/simplex_test.v	Renamed generator variable to gen in simplex test functions.
noise/test_utils.v	New module added with function setup_generator for initializing a Generator.

Possibly related PRs

• vlang/vsl#207: The changes in the main PR regarding the Generator struct and its methods are directly related to the modifications in the Simplex noise implementation, which also utilizes the Generator struct for handling permutation tables. The renaming of the generator parameter to gen in the randomize method aligns with similar changes made in the Simplex noise PR.

🐇 In the land of noise, where rabbits play,
A generator's name changed, hip-hip-hooray!
With Perlin and Simplex, they dance in the night,
Creating soft whispers, oh what a delight!
So hop along, friends, let the noise be your guide,
In this warren of wonders, let creativity glide! 🐇

---

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[PottierLoic]

I also renamed the grad_Xd functions to avoid conflicts since Simplex and Perlin use different versions of these.