Remove conversions for old saves (t83)

src/sim/save.js

@@ -1,4 +1,4 @@
-// Saving and loading a world (serializeWorld / deserializeWorld) and old-save migration.
+// Saving and loading a world (serializeWorld / deserializeWorld).
 // ---------- Save / load ----------
 const SAVE_VERSION = 2;
 const TOFF = 64; // temperatures are saved with an offset so sub-zero snow and ice survive
@@ -60,7 +60,6 @@ function deserializeWorld(meta, buffers) {
   mat.set(buffers.mat); life.set(buffers.life); flags.set(buffers.flags);
   for (let i = 0; i < N; i++) {
     if (mat[i] >= NMAT) mat[i] = EMPTY;
-    else if (mat[i] === SPRING) mat[i] = STONE; // springs are gone: older worlds keep plain rock there
   }
   blockP.set(buffers.blockP); blockV.set(buffers.blockV); filtersDirty = true;
   for (let b = 0; b < NB; b++) {
@@ -81,22 +80,8 @@ function deserializeWorld(meta, buffers) {
     }
     s.open = open === true; rackState.set(b, s);
   }
-  // pipes used to be solid copper blocks; now they are thin and let things past
-  for (let b = 0; b < NB; b++) if (blockP[b] === BP_PIPE) for (const i of blockCellList(b % BW, (b / BW) | 0)) if (mat[i] === PIPE) { mat[i] = EMPTY; part[i] = P_PIPE; }
   for (const [b, m, inv] of meta.filters || []) if (isFilter(blockP[b])) filterCfg.set(b, filterRec({ m, inv }));
-  for (let b = 0; b < NB; b++) if (isFilter(blockP[b])) {
-    // the first filters kept one material in their block variant
-    if (!filterCfg.has(b)) filterCfg.set(b, filterRec({ m: [blockV[b] & 127], inv: 0 }));
-    blockV[b] &= 128;
-  }
   if (buffers.bgm) { bgm.set(buffers.bgm); }
-  else {
-    // older saves kept trees in the foreground: move them behind
-    for (let i = 0; i < N; i++) {
-      const m = mat[i], y = (i / W) | 0;
-      if (m === LEAVES || (m === WOOD && (flags[i] & F_NAT) && y < surfY[i % W])) { bgm[i] = m; mat[i] = EMPTY; flags[i] = 0; }
-    }
-  }
   const t16 = buffers.temp, off = meta.tOff || 0; for (let i = 0; i < N; i++) temp[i] = t16[i] / 16 - off;
   saplings = (meta.saplings || []).map(([x, y, age, th, seed]) => ({ x, y, age, th, seed }));
   findTreeBases();