minetest-worldmapper 0.2.1

Minetest world mapper
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use crate::color::Color;
use crate::config::Config;
use minetestworld::{MapBlock, Position};
use std::collections::{BinaryHeap, HashMap};

/// Sort all y values for all x,z mapblock position pairs
///
/// For a given (x,z) key, the value will be a max heap of all y values.
pub(crate) fn sorted_positions(positions: &[Position]) -> HashMap<(i16, i16), BinaryHeap<i16>> {
    let mut result = HashMap::new();
    for pos in positions.iter() {
        let key = (pos.x, pos.z);
        let y_stack = result.entry(key).or_insert_with(BinaryHeap::new);
        y_stack.push(pos.y);
    }
    result
}

pub(crate) fn compute_mapblock(mapblock: &MapBlock, config: &Config, acc: &mut [Color; 256]) {
    for z in 0..16 {
        for x in 0..16 {
            let index = (x + 16 * z) as usize;
            if acc[index].alpha() > 230 {
                continue;
            }

            for y in (0..16).rev() {
                let node = mapblock.get_node_at(x, y, z);
                if let Some(colour) = config.node_colors.get(&node.param0) {
                    acc[index] = acc[index].with_background(colour);
                    if acc[index].alpha() > config.target_alpha {
                        continue;
                    }
                }
            }
        }
    }
}