@babylonjs/viewer/dist/chunks/flowGraphBezierCurveEasingBlock-SoRIZncN.esm.js

The Babylon Viewer aims to simplify a specific but common Babylon.js use case: loading, viewing, and interacting with a 3D model.

import { bF as BezierCurveEase, u as RegisterClass } from './index-HyNDfLMI.esm.js';
import { F as FlowGraphBlock } from './KHR_interactivity-CnR665Qq.esm.js';
import { d as RichTypeNumber, p as RichTypeVector2, R as RichTypeAny } from './declarationMapper-mPOKbCS_.esm.js';
import './objectModelMapping-OlchA9xj.esm.js';
import './spotLight.pure-C65PiYTZ.esm.js';

/** This file must only contain pure code and pure imports */
/**
 * Solves the CSS cubic-bezier easing for input progress `t`: find the curve parameter `u` where the
 * X coordinate equals `t` (implicit endpoints P0=(0,0), P3=(1,1)), then return the Y coordinate at `u`.
 *
 * This is a local solver rather than the shared `BezierCurve.Interpolate` on purpose: KHR_interactivity
 * needs a root finder that stays finite at stationary derivatives (e.g. control points (1,1)/(0,1), where
 * dX/du is 0 at the root). The shared solver uses plain Newton iteration and returns NaN there, so it must
 * not be changed for this consumer. Newton steps are taken when they stay inside the bracketing interval and
 * the derivative is non-negligible; otherwise the step falls back to bisection, which always converges.
 * @param t the input progress in [0, 1]
 * @param x1 X of the first control point
 * @param y1 Y of the first control point
 * @param x2 X of the second control point
 * @param y2 Y of the second control point
 * @returns the eased output progress
 */
function _SolveCssCubicBezier(t, x1, y1, x2, y2) {
    if (t <= 0) {
        return 0;
    }
    if (t >= 1) {
        return 1;
    }
    const fx0 = 1 - 3 * x2 + 3 * x1;
    const fx1 = 3 * x2 - 6 * x1;
    const fx2 = 3 * x1;
    let lowerBound = 0;
    let upperBound = 1;
    let u = t;
    for (let i = 0; i < 8; i++) {
        const u2 = u * u;
        const u3 = u2 * u;
        const x = fx0 * u3 + fx1 * u2 + fx2 * u;
        const error = x - t;
        if (Math.abs(error) < 1e-7) {
            break;
        }
        if (error > 0) {
            upperBound = u;
        }
        else {
            lowerBound = u;
        }
        const derivative = 3 * fx0 * u2 + 2 * fx1 * u + fx2;
        const newtonU = Math.abs(derivative) > 1e-7 ? u - error / derivative : NaN;
        u = Number.isFinite(newtonU) && newtonU > lowerBound && newtonU < upperBound ? newtonU : (lowerBound + upperBound) * 0.5;
    }
    const fy0 = 1 - 3 * y2 + 3 * y1;
    const fy1 = 3 * y2 - 6 * y1;
    const fy2 = 3 * y1;
    return fy0 * u * u * u + fy1 * u * u + fy2 * u;
}
/**
 * A {@link BezierCurveEase} that resolves the curve with {@link _SolveCssCubicBezier} so degenerate control
 * points (stationary X derivative) stay finite. It inherits the public `x1`/`y1`/`x2`/`y2` fields and the
 * easing-mode handling; only the core evaluation is replaced.
 */
class InteractivityBezierCurveEase extends BezierCurveEase {
    easeInCore(gradient) {
        return _SolveCssCubicBezier(gradient, this.x1, this.y1, this.x2, this.y2);
    }
}
/**
 * An easing block that generates a cubic Bézier easing function based on the data provided.
 *
 * Follows CSS cubic-bezier semantics: for input progress `t`, solve the curve parameter where X
 * equals `t`, then use the corresponding Y coordinate as the eased output progress.
 */
class FlowGraphBezierCurveEasingBlock extends FlowGraphBlock {
    constructor(
    /**
     * the configuration of the block
     */
    config) {
        super(config);
        this.config = config;
        /**
         * Internal cache of reusable easing functions.
         * key is type-mode-properties
         */
        this._easingFunctions = {};
        this.mode = this.registerDataInput("mode", RichTypeNumber, 0);
        this.controlPoint1 = this.registerDataInput("controlPoint1", RichTypeVector2);
        this.controlPoint2 = this.registerDataInput("controlPoint2", RichTypeVector2);
        this.easingFunction = this.registerDataOutput("easingFunction", RichTypeAny);
    }
    _updateOutputs(context) {
        const mode = this.mode.getValue(context);
        const controlPoint1 = this.controlPoint1.getValue(context);
        const controlPoint2 = this.controlPoint2.getValue(context);
        if (mode === undefined) {
            return;
        }
        const key = `${mode}-${controlPoint1.x}-${controlPoint1.y}-${controlPoint2.x}-${controlPoint2.y}`;
        if (!this._easingFunctions[key]) {
            const easing = new InteractivityBezierCurveEase(controlPoint1.x, controlPoint1.y, controlPoint2.x, controlPoint2.y);
            easing.setEasingMode(mode);
            this._easingFunctions[key] = easing;
        }
        this.easingFunction.setValue(this._easingFunctions[key], context);
    }
    getClassName() {
        return "FlowGraphBezierCurveEasing" /* FlowGraphBlockNames.BezierCurveEasing */;
    }
}
let _Registered = false;
/**
 * Register side effects for flowGraphBezierCurveEasingBlock.
 * Safe to call multiple times; only the first call has an effect.
 */
function RegisterFlowGraphBezierCurveEasingBlock() {
    if (_Registered) {
        return;
    }
    _Registered = true;
    RegisterClass("FlowGraphBezierCurveEasing" /* FlowGraphBlockNames.BezierCurveEasing */, FlowGraphBezierCurveEasingBlock);
}

/**
 * Re-exports pure implementation and applies runtime side effects.
 * Import flowGraphBezierCurveEasingBlock.pure for tree-shakeable, side-effect-free usage.
 */
RegisterFlowGraphBezierCurveEasingBlock();

export { FlowGraphBezierCurveEasingBlock, RegisterFlowGraphBezierCurveEasingBlock };
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