WebGPU renderer complete: dirty uploads, default limits, legacy removed, WebGPU required, warm-up (t88 phase 2d)

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

src/sim/world.js

@@ -13,6 +13,7 @@ let ents = []; // loose objects (bars)
 let bgm; // background layer: trees. Liquids, powders and gases pass in front of it.
 let flyers = []; // grains in flight, blown out of the bot
 let ghostBlocks = new Map(), ghostMolds = [];
+let renderDirty; // GPU world textures, one invalidation bit per 32x32 chunk.
 let awake, hot, hotLvl, powderArea, roofDirty;
 let loadWakeOrder = null, loadWakePending = null, loadWakeIndex = 0;
 let tick = 0, tickStamp = 1;
@@ -53,6 +54,7 @@ function alloc(w, h) {
   surfY = new Int16Array(w); roofY = new Int16Array(w); dirtY = new Int16Array(w); graniteY = new Int16Array(w); basaltY = new Int16Array(w); magmaY = new Int16Array(w);
   AMB = new Float32Array(h);
   loadWakeOrder = loadWakePending = null; loadWakeIndex = 0;
+  renderDirty = new Uint8Array(NCH).fill(1);
   cleatChunks = new Uint8Array(NCH);
   awake = new Uint8Array(NCH); hot = new Uint8Array(NCH); hotLvl = new Uint8Array(NCH);
   roofDirty = new Uint8Array(CW).fill(1);
@@ -90,7 +92,10 @@ function fillNoise() {
 }
 
 // ---------- Waking ----------
+function renderDirtyXY(x, y) { renderDirty[(y >> 5) * CW + (x >> 5)] = 1; }
+function renderDirtyIdx(i) { renderDirtyXY(i % W, (i / W) | 0); }
 function wakeXY(x, y) {
+  renderDirtyXY(x, y);
   const cx = x >> 5, cy = y >> 5, c = cy * CW + cx;
   roofDirty[cx] = 1;
   awake[c] = 3;
@@ -99,6 +104,7 @@ function wakeXY(x, y) {
   if (ly === 0) { if (cy > 0) awake[c - CW] = 3; } else if (ly === 31 && cy < CH - 1) awake[c + CW] = 3;
 }
 function wakeHeatXY(x, y) {
+  renderDirtyXY(x, y);
   const c = (y >> 5) * CW + (x >> 5);
   roofDirty[x >> 5] = 1;
   hot[c] = 6; hotLvl[c] = 2;