23 lines
775 B
GDScript
23 lines
775 B
GDScript
extends RefCounted
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const CHANCES := [1.0, 0.25, 0.05, 0.01, 0.0015, 0.0002]
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static func tail_chance(quality: float) -> float:
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var scaled := clampf(quality, 0.0, 1.0) * 5.0
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var index := mini(4, floori(scaled))
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return exp(lerpf(log(CHANCES[index]), log(CHANCES[index + 1]), scaled - index))
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static func rank_from_roll(steps: int, roll: float) -> int:
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for rank in range(steps, 0, -1):
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if roll < tail_chance(float(rank) / steps):
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return rank
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return 0
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static func roll_value(effect: String, roll: float = -1.0) -> float:
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var chance := randf() if roll < 0.0 else roll
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match effect:
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"recycler": return 0.5 + rank_from_roll(79, chance) * 0.5
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"virus": return 1.0 + rank_from_roll(19, chance)
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"titanium_armor": return 5.0 + rank_from_roll(45, chance)
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return 0.0
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