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Screw tubes use all their lanes: grains spread sideways inside a tube

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
44r0n7
2026-10-24 00:00:05 -04:00
co-authored by Claude Opus 5.5
parent 971bcc2558
commit 92e2d1c19d
6 changed files with 122 additions and 13 deletions
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src/sim/machine-tick.js
+17 -9
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@@ -126,6 +126,22 @@ function machinesTick() {
const x = i % W, y = (i / W) | 0;
// a sideways screw carries its load along the bottom: grains settle into empty lanes below
if (flat && y + 1 < H && part[i + W] === p && roomFor(i + W) && !occ[i + W]) { move(i, i + W, x, y, x, y + 1); continue; }
if (!flat) {
let own = 0, shifted = false;
const end = dy < 0 ? (y & ~3) : (y | 3);
for (let yy = y; dy < 0 ? yy >= end : yy <= end; yy += dy) if (PH[mat[yy * W + x]] === PH_POWDER) own++;
const side = ((tick >> 1) + i) & 1 ? 1 : -1;
for (let c = 0; c < 2; c++) {
const sx = c ? -side : side, xx = x + sx, j = i + sx;
if ((xx >> 2) !== (x >> 2) || part[j] !== p || !roomFor(j) || mat[j] !== EMPTY || occ[j] || stamp[j] === tickStamp) continue;
let load = 0;
for (let yy = y; dy < 0 ? yy >= end : yy <= end; yy += dy) if (PH[mat[yy * W + xx]] === PH_POWDER) load++;
// Include this grain: a strict gap prevents a sideways step being undone next beat.
if (own <= load + 1) continue;
move(i, j, x, y, xx, y); stats.moved++; shifted = true; break;
}
if (shifted) continue;
}
const nx = x + dx, ny = y + dy;
if (nx < 0 || ny < 0 || nx >= W || ny >= H) continue;
const j = i + dj;
@@ -143,15 +159,7 @@ function machinesTick() {
move(i, j, x, y, nx, ny); stats.moved++;
if (tube && pj !== p) {
// turning a corner: keep going across the new tube's width so every lane fills
let c = j, cx = nx, cy = ny;
const bxj = nx >> 2, byj = ny >> 2;
for (;;) {
const ex = cx + dx, ey = cy + dy;
if (ex < 0 || ey < 0 || ex >= W || ey >= H || (ex >> 2) !== bxj || (ey >> 2) !== byj) break;
const e = ey * W + ex;
if (part[e] !== pj || !roomFor(e) || occ[e]) break;
move(c, e, cx, cy, ex, ey); c = e; cx = ex; cy = ey;
}
tubeSpread(j, nx, ny, dx, dy);
}
}
}