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Sloped belts hold their load with moving cleats (t42); sloped filters are downhill shaking screens (t43)

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The magic grip is gone: cleats every 8 face cells, 6 grains tall, carry
pockets uphill (about 71 grains/s against 90 flat) and overflow rolls
back. Sloped filters always run downhill; grains travel by gravity and
a shake, and sorting stays exact. Drawing needs another pass.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
44r0n7
2026-10-26 19:47:59 -04:00
co-authored by Claude Opus 5.5
parent 1f8a89db6a
commit 578b55316b
28 changed files with 425 additions and 89 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/render/slope-belt-shader.js
+3 -2
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@@ -13,6 +13,7 @@ vec3 slopeCorner(vec2 p, vec2 a, float origin) {
return vec3(radius - 1.85, origin + d.x, 2.0 + d.y);
}
vec3 slopeShape(vec2 p, vec2 worldOrigin, float grade, int joins) {
if ((joins & 64) != 0) p.y -= 0.45;
float sy = grade < 0.0 ? 4.0 : 0.0;
vec2 a = vec2(-grade * 1.30814755, sy + 1.30814755), b = vec2(4.0 - grade * 1.30814755, 4.0 - sy + 1.30814755);
if ((joins & 1) != 0) { a.y = sy + 2.0; a.x = (a.y - sy - 2.61629509) / grade; }
@@ -52,11 +53,11 @@ const SM_SLOPE_DRAW = `
vec2 local = floor(tag.gb * 255.0 + 0.5) - 8.0 + fract(w);
vec3 shapePos = slopeShape(local, w - local, grade, joins);
float sd = shapePos.x, axis = shapePos.y, depth = shapePos.z;
float time = (joins & 16) != 0 ? uTime : 0.0;
float time = !mesh && (joins & 16) != 0 ? uTime : 0.0;
vec2 lb = vec2(axis, depth), alongWorld = vec2(axis, depth);
float rg = step(0.72, fract((axis - dir * (depth < 2.0 ? 1.0 : -1.0) * time * 30.0) * 0.5));
vec3 belt;
if (-sd < 0.8) {
if (-sd < (mesh ? 1.1 : 0.8)) {
belt = bandColor(lb, rg);
if (mesh && ((joins & 32) != 0) == (depth < 2.0) && dot(own.rgb, vec3(1)) > 0.01)
belt = mix(belt, own.rgb * (depth < 2.0 ? 1.0 : 0.8), 0.75 * rg);
src/render/slope-belts.js
+27 -4
View File
@@ -42,8 +42,8 @@ function prepareSlopeBelts(x0, y0, x1, y1) {
if (c === BP_BELT || c === BP_FILTER) beltCaps[b] = flatBeltCaps(b);
if (!isSlopeBelt(c)) continue;
const face = beltFaceY(c, bx, by, bx * BS) * W + bx * BS;
slopeBeltJoins[b] = slopeBeltConnections(bx, by, c) | (netSat(face) > 0 ? 16 : 0) | (filterCfg.get(b)?.inv ? 32 : 0);
for (let yy = Math.max(0, by - 1); yy <= Math.min(BH - 1, by + 1); yy++)
slopeBeltJoins[b] = slopeBeltConnections(bx, by, c) | (netSat(face) > 0 ? 16 : 0) | (filterCfg.get(b)?.inv ? 32 : 0) | (isFilter(c) && netSat(face) > 0 && screenLoaded(b) && (tick & 2) ? 64 : 0);
for (let yy = Math.max(0, by - 2); yy <= Math.min(BH - 1, by + 1); yy++)
for (let xx = Math.max(0, bx - 1); xx <= Math.min(BW - 1, bx + 1); xx++) slopeBeltHalo[yy * BW + xx] = 1;
}
}
@@ -63,6 +63,7 @@ function slopeBeltCorner(x, y, ax, ay, origin) {
function slopeBeltShape(x, y, b, joins = slopeBeltJoins[b], code = blockP[b]) {
const grade = beltGrade(code), ox = (b % BW) * BS, oy = ((b / BW) | 0) * BS;
x -= ox; y -= oy;
if (isFilter(code) && (joins & 64)) y -= 0.45;
const offset = 1.85 * Math.SQRT2, sy = grade < 0 ? 4 : 0;
const normal = 1.85 * Math.SQRT1_2;
let ax = -grade * normal, ay = sy + normal, bx = 4 - grade * normal, by = 4 - sy + normal;
@@ -107,9 +108,9 @@ function slopeBeltColor(b, x, y, anim, br, bg, bb) {
if (sd > 1e-8) return (br | 0) | ((bg | 0) << 8) | ((bb | 0) << 16);
const c = blockP[b], joins = slopeBeltJoins[b], mesh = isFilter(c);
const dir = mesh ? (blockV[b] & 128 ? 1 : -1) : (blockV[b] ? 1 : -1);
const a = slopeAlong, d = slopeAcross, time = joins & 16 ? anim : 0;
const a = slopeAlong, d = slopeAcross, time = !mesh && joins & 16 ? anim : 0;
let r = 38, g = 41, blue = 46;
if (-sd < 0.8) {
if (-sd < (mesh ? 1.1 : 0.8)) {
const stripe = (Math.floor((a - dir * (d < 2 ? 1 : -1) * (time >> 1)) / 2) & 1), k = d < 2 ? 1 : 0.72;
r = (stripe ? 92 : 56) * k; g = (stripe ? 96 : 58) * k; blue = (stripe ? 104 : 66) * k;
} else if (mesh) {
@@ -125,3 +126,25 @@ function slopeBeltColor(b, x, y, anim, br, bg, bb) {
}
return (r | 0) | ((g | 0) << 8) | ((blue | 0) << 16);
}
function screenLoaded(b) {
const bx = b % BW, by = (b / BW) | 0, c = blockP[b];
for (let x = bx * BS; x < bx * BS + BS; x++) {
const i = (beltFaceY(c, bx, by, x) - 1) * W + x;
if (i >= 0 && (PH[mat[i]] === PH_POWDER || occ[i])) return true;
}
return false;
}
// Far sidewalls stay behind the load. The cleat raster is the simulation barrier raster.
function slopeDetailAt(i, x, y) {
if (!slopeBeltHalo[(y >> 2) * BW + (x >> 2)] && !cleatMask[i]) return 0;
if (occ[i] || mach[i] || (mat[i] !== EMPTY && PH[mat[i]] !== PH_GAS) || part[i]) return 0;
if (cleatMask[i]) return 1;
for (let by = y >> 2; by <= Math.min(BH - 1, (y + 9) >> 2); by++) {
const b = by * BW + (x >> 2), c = blockP[b];
if (!isSlopeBelt(c)) continue;
const depth = beltFaceY(c, x >> 2, by, x) - y;
if (isFilter(c) ? depth === 2 : depth >= 6 && depth <= 7 + ((x + slopePhase[b]) & 1)) return isFilter(c) ? 3 : 2;
}
return 0;
}
src/render/world.js
+7
View File
@@ -289,6 +289,12 @@ function drawWorld() {
const color = slopeBeltColor(sb, x, y, anim, br, bgc, bb);
r = color & 255; g = color >> 8 & 255; b = color >> 16 & 255;
}
const slopeDetail = slopeDetailAt(i, x, y);
if (slopeDetail) {
r = slopeDetail === 1 ? 145 : slopeDetail === 3 ? 96 : 48;
g = slopeDetail === 1 ? 125 : slopeDetail === 3 ? 106 : 52;
b = slopeDetail === 1 ? 94 : slopeDetail === 3 ? 120 : 60;
}
// incandescence
if (T > 450 && m !== EMPTY && incand) {
const gi = glowIndex(PH[m] === PH_SOLID ? T + nz * 0.9 : m === MAGMA ? T + Math.sin(x * 0.19 + y * 0.11 + anim * 0.03 + nz * 0.04) * 55 - 30 : T), w = GLOW_W[gi];
@@ -339,6 +345,7 @@ function drawWorld() {
((y - ((sb / BW) | 0) * BS + 8) << 16) | ((x - (sb % BW) * BS + 8) << 8);
if (slopeArt) { r = fm ? COLR[fm] : 0; g = fm ? COLG[fm] : 0; b = fm ? COLB[fm] : 0; }
}
if (slopeDetail) cl = 4;
top = cl << 24;
fpx[row + bx] = (tb ? 0xff000000 : 0) | (cl === 5 ? 0xff0000 : 0) | (cl === 3 ? 0xff00 : 0) | (cl === 1 && !builtForLight(i, x, y) ? 0xff : 0);
}