80 lines
2 KiB
TypeScript
80 lines
2 KiB
TypeScript
import { STRIDE, type Mesh } from "./Mesh"
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type Corner = [number, number, number]
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export namespace MeshBuilder {
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export function quad(
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mesh: Mesh,
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a: Corner,
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b: Corner,
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c: Corner,
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d: Corner,
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uScale: number,
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vScale: number,
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): void {
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const base = mesh.verts.length / STRIDE
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mesh.verts.push(
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a[0],
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a[1],
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a[2],
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0,
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0,
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b[0],
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b[1],
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b[2],
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uScale,
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0,
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c[0],
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c[1],
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c[2],
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uScale,
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vScale,
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d[0],
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d[1],
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d[2],
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0,
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vScale,
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)
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mesh.indices.push(base, base + 1, base + 2, base, base + 2, base + 3)
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}
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export function slab(
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mesh: Mesh,
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x0: number,
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x1: number,
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z0: number,
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z1: number,
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y0: number,
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y1: number,
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tilesPerUnit: number,
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): void {
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const dx = (x1 - x0) * tilesPerUnit
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const dz = (z1 - z0) * tilesPerUnit
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const dy = (y1 - y0) * tilesPerUnit
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quad(mesh, [x0, y1, z0], [x1, y1, z0], [x1, y1, z1], [x0, y1, z1], dx, dz)
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quad(mesh, [x0, y0, z0], [x1, y0, z0], [x1, y1, z0], [x0, y1, z0], dx, dy)
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quad(mesh, [x1, y0, z1], [x0, y0, z1], [x0, y1, z1], [x1, y1, z1], dx, dy)
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quad(mesh, [x0, y0, z1], [x0, y0, z0], [x0, y1, z0], [x0, y1, z1], dz, dy)
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quad(mesh, [x1, y0, z0], [x1, y0, z1], [x1, y1, z1], [x1, y1, z0], dz, dy)
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}
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export function box(
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mesh: Mesh,
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centerX: number,
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centerZ: number,
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half: number,
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base: number,
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height: number,
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): void {
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const x0 = centerX - half
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const x1 = centerX + half
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const z0 = centerZ - half
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const z1 = centerZ + half
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const y1 = base + height
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quad(mesh, [x0, y1, z0], [x1, y1, z0], [x1, y1, z1], [x0, y1, z1], 1, 1)
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quad(mesh, [x0, base, z0], [x1, base, z0], [x1, y1, z0], [x0, y1, z0], 1, 1)
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quad(mesh, [x1, base, z1], [x0, base, z1], [x0, y1, z1], [x1, y1, z1], 1, 1)
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quad(mesh, [x1, base, z0], [x1, base, z1], [x1, y1, z1], [x1, y1, z0], 1, 1)
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quad(mesh, [x0, base, z1], [x0, base, z0], [x0, y1, z0], [x0, y1, z1], 1, 1)
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}
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}
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