Mercurial > games > semicongine

annotate semiconginev2/old/noise.nim @ 1225:27cd1c21290e compiletime-tests

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did: refactor resources
author sam <sam@basx.dev>
date Wed, 17 Jul 2024 22:20:59 +0700
parents 56781cc0fc7c
children
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1 import hashes
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2 import math
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3
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4 import ./core/vector
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7 proc randomGradient(pos: Vec2f, seed: int32 = 0): Vec2f =
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8 let randomAngle: float32 = TAU * (float32(int(hash((pos.x, pos.y, seed)))) / float32(high(int)))
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9 return NewVec2f(cos(randomAngle), sin(randomAngle))
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11 proc interpolate(a: float32, b: float32, weight: float32): float32 =
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12 # with Smootherstep
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13 (b - a) * ((weight * (weight * 6.0 - 15.0) + 10.0) * weight * weight * weight) + a;
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15 proc Perlin*(pos: Vec2f, seed: int32 = 0): float32 =
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16 let
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17 # grid coordinates around target point
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18 topleft = NewVec2f(trunc(pos.x), trunc(pos.y))
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19 topright = topleft + NewVec2f(1, 0)
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20 bottomleft = topleft + NewVec2f(0, 1)
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21 bottomright = topleft + NewVec2f(1, 1)
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22 # products for weights
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23 topleft_dot = topleft.randomGradient(seed).Dot((pos - topleft))
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24 topright_dot = topright.randomGradient(seed).Dot((pos - topright))
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25 bottomleft_dot = bottomleft.randomGradient(seed).Dot((pos - bottomleft))
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26 bottomright_dot = bottomright.randomGradient(seed).Dot((pos - bottomright))
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27 xinterpol = pos.x - topleft.x
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28 yinterpol = pos.y - topleft.y
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29
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30 return interpolate(
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31 interpolate(topleft_dot, bottomleft_dot, yinterpol),
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32 interpolate(topright_dot, bottomright_dot, yinterpol),
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33 xinterpol
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34 )