15 lines
561 B
Plaintext
15 lines
561 B
Plaintext
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This work follows Stefan Gustavson's paper "Simplex noise demystified"
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http://staffwww.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf
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without using uniform arrays or texture engines.
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A single vec4 uniform 'pParam' is used to set the length and a and
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c constants respectively of the permutation polynomial to use. The
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last element of the vec4 is the number of gradients to select from
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on the vertices. An example vec4 is ( 19*19, 2*19, 1, 7 )
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Refer to http://en.wikipedia.org/wiki/Permutation_polynomial for
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more information on permutation polynomials.
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