Fix segfault for large bases in perlin noise #36
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flomnes
reviewed
Feb 17, 2022
| k = ((k + base) & 255); | ||
| ii = ((ii + base) & 255); | ||
| jj = ((jj + base) & 255); | ||
| kk = ((kk + base) & 255); | ||
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From what I understand you're capping the result to 255. This can be misleading to the user since it's a hidden operation : the user could expect different results with larger values for base and not get them.
I'd recommend throwing an error or at least a warning.
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I think you're right, this commit throws errors for bases that have the potential to be non-unique. |
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The current code segfaults for large bases because it reads past the end of the _PERM array. There are a few possible fixes with advantages and disadvantages. This fix accepts all bases, but it cycles with a period of 256. An alternative method is to throw an error for bases larger than 256.