noise: perlin2d fix + 3d implementation

[PottierLoic]

Fixed 2d perlin noise and added 3d function too !

using this code, the 2d perlin noise look like this:

for i in 0..pwidth {
  for j in 0..pheight {
    value := noise.perlin2d(i*0.1, j*0.1) * 255
    state.pixels[i][j] = u32(gx.rgb(u8(value), u8(value), u8(value)).abgr8())
  }
}

and using this code and by increasing depth we have this 3d perlin noise:

mut d := 0.01
for {
  for i in 0..pwidth {
    for j in 0..pheight {
      value := noise.perlin3d(i*0.02, j*0.02, d) * 255
      state.pixels[i][j] = u32(gx.rgb(u8(value), u8(value), u8(value)).abgr8())
    }
  }
  d += 0.02
  time.sleep(33 * time.millisecond)
}

Summary by CodeRabbit

• New Features
  • Introduced a module for generating 2D and 3D Perlin noise, allowing for the creation of natural-looking textures and patterns.

[coderabbitai[bot]]

Walkthrough

The noise module has been expanded with new capabilities for generating Perlin noise, a popular gradient noise function. It now includes methods for both 2D and 3D noise generation. The update introduces a Perlin struct for 2D noise with methods to randomize and generate noise values, and a new function to calculate 3D Perlin noise.

Changes

File(s)	Change Summary
noise/perlin2d.v	Added Perlin struct with methods for 2D noise.
noise/perlin3d.v	Introduced function for 3D Perlin noise.

Poem

🐰 "In the realm of code, so spry and bold,
A rabbit hopped through the fields of old.
With Perlin whispers in 2D and 3D, quite fair,
It crafted worlds with a random, soft flair." 🌌

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[PottierLoic]

Just realized that I didn't make it random, actually the permutation set never change... We can't just shuffle for every value because it wouldn't make perlin noise anymore so maybe creating a generator struct that hold the permutations is possible ? This way we can have a perlin.randomize() and a perlin.3d(x, y, z) etc.

[larpon]

Also run v fmt on the files

[PottierLoic]

completely forgot sorry

[larpon]

@ulises-jeremias I'm unsure what the linter errors are about 🤔

[PottierLoic]

I think it's good like this, I can add some examples later if needed.