79 lines
3.1 KiB
JavaScript
79 lines
3.1 KiB
JavaScript
class App {
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constructor() {
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this.canvas = document.getElementsByTagName('canvas')[0];
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const engine = this.engine = Filament.Engine.create(this.canvas);
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this.scene = engine.createScene();
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this.triangle = Filament.EntityManager.get()
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.create();
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this.scene.addEntity(this.triangle);
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const TRIANGLE_POSITIONS = new Float32Array([
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1, 0,
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Math.cos(Math.PI * 2 / 3), Math.sin(Math.PI * 2 / 3),
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Math.cos(Math.PI * 4 / 3), Math.sin(Math.PI * 4 / 3),
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]);
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const TRIANGLE_COLORS = new Uint32Array([0xffff0000, 0xff00ff00, 0xff0000ff]);
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const VertexAttribute = Filament.VertexAttribute;
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const AttributeType = Filament.VertexBuffer$AttributeType;
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this.vb = Filament.VertexBuffer.Builder()
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.vertexCount(3)
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.bufferCount(2)
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.attribute(VertexAttribute.POSITION, 0, AttributeType.FLOAT2, 0, 8)
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.attribute(VertexAttribute.COLOR, 1, AttributeType.UBYTE4, 0, 4)
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.normalized(VertexAttribute.COLOR)
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.build(engine);
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this.vb.setBufferAt(engine, 0, TRIANGLE_POSITIONS);
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this.vb.setBufferAt(engine, 1, TRIANGLE_COLORS);
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this.ib = Filament.IndexBuffer.Builder()
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.indexCount(3)
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.bufferType(Filament.IndexBuffer$IndexType.USHORT)
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.build(engine);
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this.ib.setBuffer(engine, new Uint16Array([0, 1, 2]));
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const mat = engine.createMaterial('triangle.filamat');
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const matinst = mat.getDefaultInstance();
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Filament.RenderableManager.Builder(1)
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.boundingBox({
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center: [-1, -1, -1],
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halfExtent: [1, 1, 1]
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})
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.material(0, matinst)
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.geometry(0, Filament.RenderableManager$PrimitiveType.TRIANGLES, this.vb, this.ib)
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.build(engine, this.triangle);
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this.swapChain = engine.createSwapChain();
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this.renderer = engine.createRenderer();
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this.camera = engine.createCamera();
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this.view = engine.createView();
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this.view.setCamera(this.camera);
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this.view.setScene(this.scene);
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this.view.setClearColor([0.1, 0.2, 0.3, 1.0]); // blue-green background
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this.resize(); // adjust the initial viewport
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this.render = this.render.bind(this);
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this.resize = this.resize.bind(this);
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window.addEventListener('resize', this.resize);
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window.requestAnimationFrame(this.render);
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}
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render() {
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// Rotate the triangle.
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const radians = Date.now() / 1000;
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const transform = mat4.fromRotation(mat4.create(), radians, [0, 0, 1]);
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const tcm = this.engine.getTransformManager();
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const inst = tcm.getInstance(this.triangle);
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tcm.setTransform(inst, transform);
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inst.delete();
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// Render the frame.
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this.renderer.render(this.swapChain, this.view);
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window.requestAnimationFrame(this.render);
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}
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resize() {
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const dpr = window.devicePixelRatio;
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const width = this.canvas.width = window.innerWidth * dpr;
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const height = this.canvas.height = window.innerHeight * dpr;
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this.view.setViewport([0, 0, width, height]);
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const aspect = width / height;
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const Projection = Filament.Camera$Projection;
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this.camera.setProjection(Projection.ORTHO, -aspect, aspect, -1, 1, 0, 1);
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}
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}
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Filament.init(['triangle.filamat'], () => {
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window.app = new App()
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});
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