app/node_modules/@babylonjs/core/Engines/Extensions/engine.views.js

import { Engine } from "../engine.js";
import { Observable } from "../../Misc/observable.js";
/**
 * Class used to define an additional view for the engine
 * @see https://doc.babylonjs.com/features/featuresDeepDive/scene/multiCanvas
 */
export class EngineView {
}
const _onBeforeViewRenderObservable = new Observable();
const _onAfterViewRenderObservable = new Observable();
Object.defineProperty(Engine.prototype, "onBeforeViewRenderObservable", {
    get: function () {
        return _onBeforeViewRenderObservable;
    },
});
Object.defineProperty(Engine.prototype, "onAfterViewRenderObservable", {
    get: function () {
        return _onAfterViewRenderObservable;
    },
});
Object.defineProperty(Engine.prototype, "inputElement", {
    get: function () {
        return this._inputElement;
    },
    set: function (value) {
        if (this._inputElement !== value) {
            this._inputElement = value;
            this._onEngineViewChanged?.();
        }
    },
});
Engine.prototype.getInputElement = function () {
    return this.inputElement || this.getRenderingCanvas();
};
Engine.prototype.registerView = function (canvas, camera, clearBeforeCopy) {
    if (!this.views) {
        this.views = [];
    }
    for (const view of this.views) {
        if (view.target === canvas) {
            return view;
        }
    }
    const masterCanvas = this.getRenderingCanvas();
    if (masterCanvas) {
        canvas.width = masterCanvas.width;
        canvas.height = masterCanvas.height;
    }
    const newView = { target: canvas, camera, clearBeforeCopy, enabled: true, id: (Math.random() * 100000).toFixed() };
    this.views.push(newView);
    if (camera && !Array.isArray(camera)) {
        camera.onDisposeObservable.add(() => {
            this.unRegisterView(canvas);
        });
    }
    return newView;
};
Engine.prototype.unRegisterView = function (canvas) {
    if (!this.views || this.views.length === 0) {
        return this;
    }
    for (const view of this.views) {
        if (view.target === canvas) {
            const index = this.views.indexOf(view);
            if (index !== -1) {
                this.views.splice(index, 1);
            }
            break;
        }
    }
    return this;
};
Engine.prototype._renderViewStep = function (view) {
    const canvas = view.target;
    const context = canvas.getContext("2d");
    if (!context) {
        return true;
    }
    const parent = this.getRenderingCanvas();
    _onBeforeViewRenderObservable.notifyObservers(view);
    const camera = view.camera;
    let previewCamera = null;
    let previewCameras = null;
    let scene = null;
    if (camera) {
        scene = Array.isArray(camera) ? camera[0].getScene() : camera.getScene();
        previewCamera = scene.activeCamera;
        previewCameras = scene.activeCameras;
        this.activeView = view;
        if (Array.isArray(camera)) {
            scene.activeCameras = camera;
        }
        else {
            scene.activeCamera = camera;
            scene.activeCameras = null;
        }
    }
    if (view.customResize) {
        view.customResize(canvas);
    }
    else {
        // Set sizes
        const width = Math.floor(canvas.clientWidth / this._hardwareScalingLevel);
        const height = Math.floor(canvas.clientHeight / this._hardwareScalingLevel);
        const dimsChanged = width !== canvas.width || parent.width !== canvas.width || height !== canvas.height || parent.height !== canvas.height;
        if (canvas.clientWidth && canvas.clientHeight && dimsChanged) {
            canvas.width = width;
            canvas.height = height;
            this.setSize(width, height);
        }
    }
    if (!parent.width || !parent.height) {
        return false;
    }
    // Render the frame
    this._renderFrame();
    this.flushFramebuffer();
    // Copy to target
    if (view.clearBeforeCopy) {
        context.clearRect(0, 0, parent.width, parent.height);
    }
    context.drawImage(parent, 0, 0);
    // Restore
    if (scene) {
        scene.activeCameras = previewCameras;
        scene.activeCamera = previewCamera;
    }
    _onAfterViewRenderObservable.notifyObservers(view);
    return true;
};
Engine.prototype._renderViews = function () {
    if (!this.views || this.views.length === 0) {
        return false;
    }
    const parent = this.getRenderingCanvas();
    if (!parent) {
        return false;
    }
    let inputElementView;
    for (const view of this.views) {
        if (!view.enabled) {
            continue;
        }
        const canvas = view.target;
        // Always render the view correspondent to the inputElement for last
        if (canvas === this.inputElement) {
            inputElementView = view;
            continue;
        }
        if (!this._renderViewStep(view)) {
            return false;
        }
    }
    if (inputElementView) {
        if (!this._renderViewStep(inputElementView)) {
            return false;
        }
    }
    this.activeView = null;
    return true;
};
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