High-res textures built on first use: no cost in the pixel-art style, the 128x128 atlas only when zoomed in

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/render3d.rs

@@ -1406,7 +1406,7 @@ impl R3d {
                         lava_fresh = true;
                     }
                     let ch = &mut self.chunks[(cz * self.ncx + cx) as usize];
-                    let atlas = if self.chunks_hd { &gfx.atlas_hd } else { &gfx.atlas };
+                    let atlas: &Texture2D = if self.chunks_hd { &gfx.atlas_hd } else { &gfx.atlas };
                     let [m, o, l, k] = build_chunk(&g.map, a, &self.lava, cx, cz, atlas, self.wall_sub, self.chunks_hd);
                     ch.mesh = m;
                     ch.overlay = o;
@@ -1652,8 +1652,8 @@ impl R3d {
         };
         let atlas = match tile {
             16 => &gfx.atlas,
-            crate::gfx::HD_TILE => &gfx.atlas_hd,
-            _ => &gfx.atlas_hd2,
+            crate::gfx::HD_TILE => &*gfx.atlas_hd,
+            _ => &*gfx.atlas_hd2,
         };
         for ch in self.chunks.iter_mut() {
             for mesh in [&mut ch.mesh, &mut ch.overlay].into_iter().flatten() {
@@ -1808,6 +1808,11 @@ impl R3d {
         // high) gives every texel nearly a pixel; fewer pixels would only turn it into noise
         let hd = self.pixel_rows >= crate::settings::HIGH_RES_ROWS as u32;
         let px_per_tile = world_rows / cam.view_h().max(0.1);
+        if hd {
+            // the detailed sprites are built on first use; that also measures the gear anchors,
+            // which the gear below needs
+            let _: &Texture2D = &gfx.hd_sprites;
+        }
         for e in &g.ents {
             if !e.alive || e.held || unit_hidden(g, e) {
                 continue;