393 lines
13 KiB
JavaScript
393 lines
13 KiB
JavaScript
import mat4 from './mat4';
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import quat from './quat';
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import vec2 from './vec2';
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import vec3 from './vec3';
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import { epsilon } from './constants';
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export default class mat3 {
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constructor(values) {
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this.values = new Float32Array(9);
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if (values !== undefined) {
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this.init(values);
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}
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}
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at(index) {
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return this.values[index];
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}
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init(values) {
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for (let i = 0; i < 9; i++) {
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this.values[i] = values[i];
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}
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return this;
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}
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reset() {
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for (let i = 0; i < 9; i++) {
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this.values[i] = 0;
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}
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}
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copy(dest) {
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if (!dest) {
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dest = new mat3();
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}
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for (let i = 0; i < 9; i++) {
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dest.values[i] = this.values[i];
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}
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return dest;
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}
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all() {
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const data = [];
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for (let i = 0; i < 9; i++) {
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data[i] = this.values[i];
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}
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return data;
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}
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row(index) {
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return [
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this.values[index * 3 + 0],
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this.values[index * 3 + 1],
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this.values[index * 3 + 2]
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];
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}
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col(index) {
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return [this.values[index], this.values[index + 3], this.values[index + 6]];
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}
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equals(matrix, threshold = epsilon) {
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for (let i = 0; i < 9; i++) {
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if (Math.abs(this.values[i] - matrix.at(i)) > threshold) {
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return false;
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}
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}
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return true;
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}
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determinant() {
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const a00 = this.values[0];
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const a01 = this.values[1];
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const a02 = this.values[2];
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const a10 = this.values[3];
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const a11 = this.values[4];
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const a12 = this.values[5];
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const a20 = this.values[6];
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const a21 = this.values[7];
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const a22 = this.values[8];
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const det01 = a22 * a11 - a12 * a21;
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const det11 = -a22 * a10 + a12 * a20;
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const det21 = a21 * a10 - a11 * a20;
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return a00 * det01 + a01 * det11 + a02 * det21;
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}
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setIdentity() {
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this.values[0] = 1;
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this.values[1] = 0;
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this.values[2] = 0;
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this.values[3] = 0;
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this.values[4] = 1;
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this.values[5] = 0;
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this.values[6] = 0;
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this.values[7] = 0;
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this.values[8] = 1;
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return this;
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}
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transpose() {
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const temp01 = this.values[1];
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const temp02 = this.values[2];
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const temp12 = this.values[5];
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this.values[1] = this.values[3];
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this.values[2] = this.values[6];
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this.values[3] = temp01;
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this.values[5] = this.values[7];
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this.values[6] = temp02;
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this.values[7] = temp12;
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return this;
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}
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inverse() {
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const a00 = this.values[0];
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const a01 = this.values[1];
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const a02 = this.values[2];
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const a10 = this.values[3];
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const a11 = this.values[4];
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const a12 = this.values[5];
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const a20 = this.values[6];
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const a21 = this.values[7];
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const a22 = this.values[8];
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const det01 = a22 * a11 - a12 * a21;
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const det11 = -a22 * a10 + a12 * a20;
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const det21 = a21 * a10 - a11 * a20;
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let det = a00 * det01 + a01 * det11 + a02 * det21;
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if (!det) {
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return null;
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}
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det = 1.0 / det;
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this.values[0] = det01 * det;
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this.values[1] = (-a22 * a01 + a02 * a21) * det;
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this.values[2] = (a12 * a01 - a02 * a11) * det;
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this.values[3] = det11 * det;
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this.values[4] = (a22 * a00 - a02 * a20) * det;
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this.values[5] = (-a12 * a00 + a02 * a10) * det;
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this.values[6] = det21 * det;
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this.values[7] = (-a21 * a00 + a01 * a20) * det;
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this.values[8] = (a11 * a00 - a01 * a10) * det;
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return this;
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}
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multiply(matrix) {
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const a00 = this.values[0];
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const a01 = this.values[1];
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const a02 = this.values[2];
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const a10 = this.values[3];
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const a11 = this.values[4];
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const a12 = this.values[5];
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const a20 = this.values[6];
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const a21 = this.values[7];
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const a22 = this.values[8];
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const b00 = matrix.at(0);
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const b01 = matrix.at(1);
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const b02 = matrix.at(2);
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const b10 = matrix.at(3);
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const b11 = matrix.at(4);
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const b12 = matrix.at(5);
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const b20 = matrix.at(6);
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const b21 = matrix.at(7);
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const b22 = matrix.at(8);
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this.values[0] = b00 * a00 + b01 * a10 + b02 * a20;
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this.values[1] = b00 * a01 + b01 * a11 + b02 * a21;
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this.values[2] = b00 * a02 + b01 * a12 + b02 * a22;
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this.values[3] = b10 * a00 + b11 * a10 + b12 * a20;
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this.values[4] = b10 * a01 + b11 * a11 + b12 * a21;
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this.values[5] = b10 * a02 + b11 * a12 + b12 * a22;
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this.values[6] = b20 * a00 + b21 * a10 + b22 * a20;
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this.values[7] = b20 * a01 + b21 * a11 + b22 * a21;
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this.values[8] = b20 * a02 + b21 * a12 + b22 * a22;
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return this;
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}
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multiplyVec2(vector, result) {
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const x = vector.x;
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const y = vector.y;
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if (result) {
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result.xy = [
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x * this.values[0] + y * this.values[3] + this.values[6],
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x * this.values[1] + y * this.values[4] + this.values[7]
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];
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return result;
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}
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else {
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return new vec2([
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x * this.values[0] + y * this.values[3] + this.values[6],
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x * this.values[1] + y * this.values[4] + this.values[7]
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]);
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}
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}
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multiplyVec3(vector, result) {
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const x = vector.x;
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const y = vector.y;
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const z = vector.z;
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if (result) {
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result.xyz = [
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x * this.values[0] + y * this.values[3] + z * this.values[6],
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x * this.values[1] + y * this.values[4] + z * this.values[7],
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x * this.values[2] + y * this.values[5] + z * this.values[8]
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];
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return result;
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}
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else {
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return new vec3([
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x * this.values[0] + y * this.values[3] + z * this.values[6],
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x * this.values[1] + y * this.values[4] + z * this.values[7],
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x * this.values[2] + y * this.values[5] + z * this.values[8]
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]);
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}
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}
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toMat4(result) {
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if (result) {
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result.init([
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this.values[0],
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this.values[1],
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this.values[2],
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0,
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this.values[3],
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this.values[4],
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this.values[5],
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0,
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this.values[6],
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this.values[7],
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this.values[8],
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0,
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0,
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0,
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0,
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1
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]);
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return result;
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}
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else {
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return new mat4([
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this.values[0],
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this.values[1],
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this.values[2],
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0,
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this.values[3],
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this.values[4],
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this.values[5],
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0,
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this.values[6],
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this.values[7],
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this.values[8],
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0,
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0,
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0,
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0,
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1
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]);
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}
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}
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toQuat() {
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const m00 = this.values[0];
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const m01 = this.values[1];
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const m02 = this.values[2];
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const m10 = this.values[3];
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const m11 = this.values[4];
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const m12 = this.values[5];
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const m20 = this.values[6];
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const m21 = this.values[7];
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const m22 = this.values[8];
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const fourXSquaredMinus1 = m00 - m11 - m22;
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const fourYSquaredMinus1 = m11 - m00 - m22;
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const fourZSquaredMinus1 = m22 - m00 - m11;
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const fourWSquaredMinus1 = m00 + m11 + m22;
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let biggestIndex = 0;
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let fourBiggestSquaredMinus1 = fourWSquaredMinus1;
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if (fourXSquaredMinus1 > fourBiggestSquaredMinus1) {
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fourBiggestSquaredMinus1 = fourXSquaredMinus1;
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biggestIndex = 1;
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}
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if (fourYSquaredMinus1 > fourBiggestSquaredMinus1) {
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fourBiggestSquaredMinus1 = fourYSquaredMinus1;
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biggestIndex = 2;
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}
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if (fourZSquaredMinus1 > fourBiggestSquaredMinus1) {
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fourBiggestSquaredMinus1 = fourZSquaredMinus1;
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biggestIndex = 3;
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}
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const biggestVal = Math.sqrt(fourBiggestSquaredMinus1 + 1) * 0.5;
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const mult = 0.25 / biggestVal;
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const result = new quat();
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switch (biggestIndex) {
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case 0:
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result.w = biggestVal;
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result.x = (m12 - m21) * mult;
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result.y = (m20 - m02) * mult;
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result.z = (m01 - m10) * mult;
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break;
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case 1:
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result.w = (m12 - m21) * mult;
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result.x = biggestVal;
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result.y = (m01 + m10) * mult;
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result.z = (m20 + m02) * mult;
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break;
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case 2:
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result.w = (m20 - m02) * mult;
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result.x = (m01 + m10) * mult;
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result.y = biggestVal;
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result.z = (m12 + m21) * mult;
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break;
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case 3:
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result.w = (m01 - m10) * mult;
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result.x = (m20 + m02) * mult;
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result.y = (m12 + m21) * mult;
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result.z = biggestVal;
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break;
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}
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return result;
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}
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rotate(angle, axis) {
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let x = axis.x;
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let y = axis.y;
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let z = axis.z;
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let length = Math.sqrt(x * x + y * y + z * z);
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if (!length) {
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return null;
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}
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if (length !== 1) {
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length = 1 / length;
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x *= length;
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y *= length;
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z *= length;
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}
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const s = Math.sin(angle);
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const c = Math.cos(angle);
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const t = 1.0 - c;
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const a00 = this.values[0];
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const a01 = this.values[1];
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const a02 = this.values[2];
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const a10 = this.values[4];
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const a11 = this.values[5];
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const a12 = this.values[6];
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const a20 = this.values[8];
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const a21 = this.values[9];
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const a22 = this.values[10];
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const b00 = x * x * t + c;
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const b01 = y * x * t + z * s;
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const b02 = z * x * t - y * s;
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const b10 = x * y * t - z * s;
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const b11 = y * y * t + c;
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const b12 = z * y * t + x * s;
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const b20 = x * z * t + y * s;
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const b21 = y * z * t - x * s;
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const b22 = z * z * t + c;
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this.values[0] = a00 * b00 + a10 * b01 + a20 * b02;
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this.values[1] = a01 * b00 + a11 * b01 + a21 * b02;
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this.values[2] = a02 * b00 + a12 * b01 + a22 * b02;
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this.values[3] = a00 * b10 + a10 * b11 + a20 * b12;
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this.values[4] = a01 * b10 + a11 * b11 + a21 * b12;
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this.values[5] = a02 * b10 + a12 * b11 + a22 * b12;
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this.values[6] = a00 * b20 + a10 * b21 + a20 * b22;
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this.values[7] = a01 * b20 + a11 * b21 + a21 * b22;
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this.values[8] = a02 * b20 + a12 * b21 + a22 * b22;
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return this;
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}
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static product(m1, m2, result) {
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const a00 = m1.at(0);
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const a01 = m1.at(1);
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const a02 = m1.at(2);
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const a10 = m1.at(3);
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const a11 = m1.at(4);
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const a12 = m1.at(5);
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const a20 = m1.at(6);
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const a21 = m1.at(7);
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const a22 = m1.at(8);
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const b00 = m2.at(0);
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const b01 = m2.at(1);
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const b02 = m2.at(2);
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const b10 = m2.at(3);
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const b11 = m2.at(4);
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const b12 = m2.at(5);
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const b20 = m2.at(6);
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const b21 = m2.at(7);
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const b22 = m2.at(8);
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if (result) {
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result.init([
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b00 * a00 + b01 * a10 + b02 * a20,
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b00 * a01 + b01 * a11 + b02 * a21,
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b00 * a02 + b01 * a12 + b02 * a22,
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b10 * a00 + b11 * a10 + b12 * a20,
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b10 * a01 + b11 * a11 + b12 * a21,
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b10 * a02 + b11 * a12 + b12 * a22,
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b20 * a00 + b21 * a10 + b22 * a20,
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b20 * a01 + b21 * a11 + b22 * a21,
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b20 * a02 + b21 * a12 + b22 * a22
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]);
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return result;
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}
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else {
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return new mat3([
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b00 * a00 + b01 * a10 + b02 * a20,
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b00 * a01 + b01 * a11 + b02 * a21,
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b00 * a02 + b01 * a12 + b02 * a22,
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b10 * a00 + b11 * a10 + b12 * a20,
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b10 * a01 + b11 * a11 + b12 * a21,
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b10 * a02 + b11 * a12 + b12 * a22,
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b20 * a00 + b21 * a10 + b22 * a20,
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b20 * a01 + b21 * a11 + b22 * a21,
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b20 * a02 + b21 * a12 + b22 * a22
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]);
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}
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}
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}
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mat3.identity = new mat3().setIdentity();
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