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Fixed config seed #516

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Fixed config seed #516

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2 changes: 1 addition & 1 deletion feather/server/src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -64,7 +64,7 @@ fn init_world_source(game: &mut Game, config: &Config) {
// world otherwise. This is a placeholder:
// we don't have proper world generation yet.

let seed = 42; // FIXME: load from the level file
let seed = worldgen::seed_from_string(&config.world.seed);

let generator: Arc<dyn WorldGenerator> = match &config.world.generator[..] {
"flat" => Arc::new(SuperflatWorldGenerator::new(
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18 changes: 18 additions & 0 deletions feather/worldgen/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -364,6 +364,18 @@ impl BiomeGenerator for StaticBiomeGenerator {
}
}

pub fn seed_from_string(s: &str) -> u64 {
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This should maybe be an i64, such that negative seeds also work as expected?

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Everywhere in feather seeds are defined by u64

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@Defman Defman Jan 16, 2022 •
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Yes, but it should be parsed as i64 and then cast to u64. I thin that's how vanilla Minecraft works.

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I think it should be i64 everywhere and only be casted when passing it to RNGs, it would be more convenient for feather or plugin developers who expect -104019040 seed to be negative, and for end users that expect /seed (or seed value in logs / crash reports) to be the same as in config.toml.

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I agree with the above comment, @ELginas do you want to make this change or should I merge this? We can then create a new issue to change the seed type from u64 to i64.

s.parse().unwrap_or_else(|_| {
if s.is_empty() {
rand::random()
} else {
s.chars()
.fold(0i32, |val, ch| val.wrapping_mul(31).wrapping_add(ch as i32))
as i64
}
}) as u64
}

#[cfg(test)]
mod tests {
use super::*;
Expand Down Expand Up @@ -468,4 +480,10 @@ mod tests {
assert_eq!(biomes.get_at_block(-1, 0, -1), Biome::Plains);
assert_eq!(biomes.get_at_block(-1, 0, 0), Biome::BirchForest);
}

#[test]
fn test_seed_from_config() {
assert_eq!(seed_from_string("42"), 42);
assert_eq!(seed_from_string("Hello"), 69609650);
}
}