@woosh/meep-engine/src/engine/physics/fluid/prototype.js

Pure JavaScript game engine. Fully featured and production ready.

import { MetricCollection } from "../../development/performance/MetricCollection.js";
import {
    MetricCollectionConsoleMonitor
} from "../../development/performance/monitor/MetricCollectionConsoleMonitor.js";
import Entity from "../../ecs/Entity.js";
import GUIElement from "../../ecs/gui/GUIElement.js";
import GUIElementSystem from "../../ecs/gui/GUIElementSystem.js";
import { EngineHarness } from "../../EngineHarness.js";
import { BehaviorComponent } from "../../intelligence/behavior/ecs/BehaviorComponent.js";
import { BehaviorSystem } from "../../intelligence/behavior/ecs/BehaviorSystem.js";
import { FluidField } from "./FluidField.js";
import { FluidSimulator } from "./FluidSimulator.js";
import { SliceVisualiser } from "./SliceVisualiser.js";

const harness = new EngineHarness();

const metrics = new MetricCollection();

metrics.create({ name: 'sim' })

/**
 *
 * @param {Engine} engine
 */
function main(engine) {

    const ecd = engine.entityManager.dataset;

    const field = new FluidField();

    field.addAttribute('x');
    field.addAttribute('y');
    field.addAttribute('z');

    field.resolution = [32, 32, 64];

    field.build();

    field.setAttributeAt(0, 15, 16, 0, -100);
    field.setAttributeAt(0, 17, 16, 0, 100);
    field.setAttributeAt(1, 16, 15, 0, -100);
    field.setAttributeAt(1, 16, 17, 0, 100);

    field.setAttributeAt(2, 15, 16, 0, 100);
    field.setAttributeAt(2, 17, 16, 0, 100);
    field.setAttributeAt(2, 16, 15, 0, 100);
    field.setAttributeAt(2, 16, 17, 0, 100);


    const sim = new FluidSimulator();


    const slice_view = new SliceVisualiser();

    slice_view.size.set(432, 1000);
    slice_view.scale.setScalar(2);
    slice_view.transformOrigin.set(0, 0);

    slice_view.setData(field.buffer, field.resolution);


    new Entity()
        .add(BehaviorComponent.loop(time_delta => {

            const t0 = performance.now();

            sim.step(field, 0.015);

            metrics.get('sim').record(performance.now() - t0);

            slice_view.setData(field.buffer, field.resolution);

            slice_view.draw();

        }))
        .build(ecd);

    MetricCollectionConsoleMonitor.from(metrics).start()

    new Entity()
        .add(GUIElement.fromView(slice_view))
        .build(ecd);

}

harness.initialize({
    configuration(config, engine) {
        config.addSystem(new GUIElementSystem(engine.gameView, engine))
        config.addSystem(new BehaviorSystem(engine))
    }
}).then(main)