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Faster roof scan and heat pass with identical results (t21)

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- The roof is rescanned only in area columns that changed since the last scan: a quiet Huge
  world goes from 4.60 to 1.88 ms per scan (every 20 ticks).
- The heat pass skips react() for solids and powders below their first reaction threshold:
  Huge world digging 2.54 -> 2.34 ms/tick, quiet 1.39 -> 1.18.
- Every suite's output is identical apart from timing lines; seeds make the same worlds.
- test/t_sim_optimizations.js checks the dirty roof against a full scan and the heat loop
  against the reference loop byte for byte.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
44r0n7
2026-10-24 22:18:50 -04:00
co-authored by Claude Opus 5.5
parent d3fc1d2cbc
commit f57bdd6084
9 changed files with 160 additions and 11 deletions
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src/sim/heat.js
+20 -1
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@@ -7,6 +7,20 @@ function airflowAt(i) { const a = airS[i]; return a !== 0 && ((curAir() - a) & 0
const POROUS = new Uint8Array(NMAT); POROUS[ASH] = 1; POROUS[SLAG] = 1; POROUS[COAL] = 1; POROUS[CHARCOAL] = 1;
const SOIL = new Uint8Array(NMAT); SOIL[DIRT] = 1; SOIL[GRASS] = 1; SOIL[LDIRT] = 1;
const HOTLIQ = new Uint8Array(NMAT); for (const m of [MAGMA, MCU, MFE, MST, MGL, MAG, MAU, MBZ, MBS, MSLAG]) HOTLIQ[m] = 1;
// Cold solids and powders cannot react below their first applicable threshold.
const REACT_MIN = new Float64Array(NMAT).fill(Infinity);
for (let m = 0; m < NMAT; m++) {
if (PH[m] === PH_LIQUID || PH[m] === PH_GAS) REACT_MIN[m] = -Infinity;
else {
if (IGN[m] !== 0) REACT_MIN[m] = Math.min(REACT_MIN[m], IGN[m]);
if (MELT[m] !== 0) REACT_MIN[m] = Math.min(REACT_MIN[m], MELT[m]);
}
}
REACT_MIN[CLAY] = Math.min(REACT_MIN[CLAY], 880);
REACT_MIN[LCLAY] = Math.min(REACT_MIN[LCLAY], 880);
REACT_MIN[WOOD] = Math.min(REACT_MIN[WOOD], 380);
REACT_MIN[LWOOD] = Math.min(REACT_MIN[LWOOD], 380);
REACT_MIN[GRASS] = Math.min(REACT_MIN[GRASS], 260);
// Alloys: a molten additive grain turns neighbouring molten copper into the alloy,
// and is itself used up after about this many (the ratio: bronze ~1:7 tin, brass ~1:2 zinc).
const ALLOY = { [MSN]: { into: MBZ, per: 7 }, [MZN]: { into: MBS, per: 2 } };
@@ -51,6 +65,7 @@ function heatPass() {
function heatChunk(c, sc) {
const cx = c % CW, cy = (c / CW) | 0;
const x0 = cx << 5, y0 = cy << 5, x1 = Math.min(W, x0 + 32), y1 = Math.min(H, y0 + 32);
roofDirty[cx] = 1;
const leftCold = cx > 0 && !hot[c - 1], upCold = cy > 0 && !hot[c - CW];
let maxDev = 0, burning = false;
for (let y = y0; y < y1; y++) {
@@ -80,7 +95,11 @@ function heatChunk(c, sc) {
} else rel = RELAX[m];
t += (amb - t) * rel * sc;
temp[i] = t;
if (m !== EMPTY) { react(i, x, y, m); m = mat[i]; t = temp[i]; }
if (m !== EMPTY) {
// Test the stored Float32 temperature, just as react() reads it.
if ((flags[i] & F_BURN) || !(temp[i] < REACT_MIN[m])) react(i, x, y, m);
m = mat[i]; t = temp[i];
}
const dv = t > amb ? t - amb : amb - t;
if (dv > maxDev) maxDev = dv;
if (flags[i] & F_BURN) burning = true;