@tolokoban/tgd
Version:
ToloGameDev library for WebGL2
167 lines • 15.4 kB
JavaScript
import { TgdDataset } from "./../dataset/index.js";
import { isTgdTypeArrayForElements } from "./../types/index.js";
import { TgdVec3 } from "./../math/index.js";
import { webglElementTypeFromTypedArray, webglLookup } from "./../utils/index.js";
import { TgdBoundingBox, tgdGeometryJoin } from "../index.js";
/**
* Geometry is used to define a mesh.
* It must hold at least one vec3 attributes
* for the vertices.
*/
export class TgdGeometry {
static make(options) {
const definition = {};
const { count, drawMode, elements, attPosition, attNormal, attUV, computeNormalsIfMissing } = options;
definition[attPosition.name] = attPosition.type ?? "vec3";
if (attNormal)
definition[attNormal.name] = attNormal.type ?? "vec3";
if (attUV)
definition[attUV.name] = attUV.type ?? "vec2";
const dataset = new TgdDataset(definition);
dataset.set(attPosition.name, attPosition.data);
if (attNormal)
dataset.set(attNormal.name, attNormal.data);
if (attUV)
dataset.set(attUV.name, attUV.data);
return new TgdGeometry({
dataset,
count,
drawMode,
elements,
computeNormalsIfMissing,
});
}
static fitElementsInTypeArray(elements) {
if (isTgdTypeArrayForElements(elements))
return elements;
const max = elements.reduce((prv, cur) => Math.max(prv, cur), 0);
if (max <= 0xff)
return new Uint8Array(elements);
if (max <= 0xffff)
return new Uint16Array(elements);
return new Uint32Array(elements);
}
static join(geometries) {
return tgdGeometryJoin(geometries);
}
constructor(options) {
const { dataset, drawMode = "TRIANGLES", attPosition = "POSITION", attNormal = "NORMAL", attUV = "TEXCOORD_0", name = `TgdGeometry#${TgdGeometry.counter++}`, } = options;
this.name = name;
this._dataset = dataset;
this.drawMode = typeof drawMode === "number" ? drawMode : WebGL2RenderingContext[drawMode];
const { elements } = options;
this.elements = elements;
this._elementsType = elements ? webglElementTypeFromTypedArray(elements) : 0;
this.attPosition = attPosition;
this.attNormal = attNormal;
this.attUV = attUV;
this.count = elements?.length ?? dataset.count;
if (options.computeNormalsIfMissing)
this.computeNormals();
}
debug(caption) {
const label = `[${caption ?? this.name}]`;
this.dataset.debug(`${label} Dataset`);
console.debug(`${label} Count:`, this.count);
console.debug(`${label} DrawMode:`, webglLookup(this.drawMode));
console.debug(this.computeBoundingBox());
}
get dataset() {
return this._dataset;
}
get elementsType() {
return this._elementsType;
}
/**
* Return the index of a vertex.
* If no elements array has been defined, we return `index` verbatim.
* Otherwise, we use this elements array.
*/
getElement(index) {
return this.elements?.[index] ?? index;
}
computeNormals() {
let normals = [];
if (this.drawMode === WebGL2RenderingContext.TRIANGLES) {
normals = this.computeNormalsForTrianglesDrawMode();
}
else {
console.error("We don't know how to compute normals for this draw mode:", this.drawMode);
return this;
}
const attNormalName = this.attNormal;
this.dataset.addAttributes({
[attNormalName]: "vec3",
});
const values = [];
for (const [nx, ny, nz] of normals) {
values.push(nx, ny, nz);
}
this.dataset.set(attNormalName, new Float32Array(values));
return this;
}
computeBoundingBox() {
const bbox = new TgdBoundingBox();
const { get } = this.dataset.getAttribAccessor(this.attPosition);
for (let index = 0; index < this.count; index++) {
const x = get(index, 0);
const y = get(index, 1);
const z = get(index, 2);
bbox.addPoint(x, y, z);
}
return bbox;
}
computeNormalsForTrianglesDrawMode() {
const ds = this.dataset;
const normalsAccumulator = new Map();
const addNormal = (index, A, B, C) => {
const norm = computeNormal(A, B, C);
const item = normalsAccumulator.get(index);
if (item) {
item.add(norm);
}
else {
normalsAccumulator.set(index, new TgdVec3(norm.x, norm.y, norm.z));
}
};
const { get } = ds.getAttribAccessor(this.attPosition);
const indexes = new Set();
let indexMax = 0;
for (let element = 0; element < this.count; element += 3) {
const index0 = this.getElement(element + 0);
indexes.add(index0);
indexMax = Math.max(indexMax, index0);
const index1 = this.getElement(element + 1);
indexes.add(index1);
indexMax = Math.max(indexMax, index1);
const index2 = this.getElement(element + 2);
indexes.add(index2);
indexMax = Math.max(indexMax, index2);
const A = new TgdVec3(get(index0, 0), get(index0, 1), get(index0, 2));
const B = new TgdVec3(get(index1, 0), get(index1, 1), get(index1, 2));
const C = new TgdVec3(get(index2, 0), get(index2, 1), get(index2, 2));
addNormal(index0, A, B, C);
addNormal(index1, B, C, A);
addNormal(index2, C, A, B);
}
const normals = [];
for (let index = 0; index <= indexMax; index++) {
const item = normalsAccumulator.get(index);
if (item) {
item.normalize();
normals.push(item);
}
else {
normals.push(new TgdVec3());
}
}
return normals;
}
}
TgdGeometry.counter = 1;
function computeNormal(A, B, C) {
const AB = new TgdVec3(B).subtract(A);
const AC = new TgdVec3(C).subtract(A);
return AB.cross(AC).normalize();
}
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