minedmap: separate collection for region list from preprocessing

Preparation for parallel processing, as well as a fix for regions
missing from later steps when the initial processing failed (rather than
using the processed data from a previous run).

src/bin/minedmap/main.rs

@@ -10,7 +10,7 @@ use std::path::PathBuf;
 use anyhow::Result;
 use clap::Parser;
 
-use common::{Config, TileCoords};
+use common::Config;
 use metadata_writer::MetadataWriter;
 use region_processor::RegionProcessor;
 use tile_mipmapper::TileMipmapper;
@@ -28,11 +28,7 @@ fn main() -> Result<()> {
 	let args = Args::parse();
 	let config = Config::new(args);
 
-	let mut regions = RegionProcessor::new(&config).run()?;
-
-	// Sort regions in a zig-zag pattern to optimize cache usage
-	regions.sort_unstable_by_key(|&TileCoords { x, z }| (x, if x % 2 == 0 { z } else { -z }));
-
+	let regions = RegionProcessor::new(&config).run()?;
 	TileRenderer::new(&config).run(&regions)?;
 	let tiles = TileMipmapper::new(&config).run(&regions)?;
 	MetadataWriter::new(&config).run(tiles)?;