@giraphics/grpkggfx/lib/renderer/camera.js

A nice greeter

import { mat4, vec3 } from 'gl-matrix';
export class Camera {
    constructor(aspect) {
        this.x = 0;
        this.y = 0;
        this.z = 0;
        this.rotX = 0;
        this.rotY = 0;
        this.rotZ = 0;
        this.fovy = (2 * Math.PI) / 5;
        this.aspect = 16 / 9;
        this.near = 1;
        this.far = 1000;
        this.aspect = aspect;
    }
    getViewMatrix() {
        const viewMatrix = mat4.create();
        mat4.lookAt(viewMatrix, vec3.fromValues(this.x, this.y, this.z), vec3.fromValues(0, 0, 0), vec3.fromValues(0, 1, 0));
        mat4.rotateX(viewMatrix, viewMatrix, this.rotX);
        mat4.rotateY(viewMatrix, viewMatrix, this.rotY);
        mat4.rotateZ(viewMatrix, viewMatrix, this.rotZ);
        return viewMatrix;
    }
    getProjectionMatrix() {
        const projectionMatrix = mat4.create();
        mat4.perspective(projectionMatrix, this.fovy, this.aspect, this.near, this.far);
        return projectionMatrix;
    }
    getCameraViewProjMatrix() {
        const viewProjMatrix = mat4.create();
        const view = this.getViewMatrix();
        const proj = this.getProjectionMatrix();
        mat4.multiply(viewProjMatrix, proj, view);
        return viewProjMatrix;
    }
    hello() {
        return "Hello from camera";
    }
}