Add existing to tracked

node_modules/@cesium/engine/Source/Scene/VoxelBoundsCollection.js

@@ -0,0 +1,494 @@
+import Cartesian2 from "../Core/Cartesian2.js";
+import Cartesian3 from "../Core/Cartesian3.js";
+import Cartesian4 from "../Core/Cartesian4.js";
+import Check from "../Core/Check.js";
+import ClippingPlane from "./ClippingPlane.js";
+import ContextLimits from "../Renderer/ContextLimits.js";
+import defined from "../Core/defined.js";
+import destroyObject from "../Core/destroyObject.js";
+import Event from "../Core/Event.js";
+import Frozen from "../Core/Frozen.js";
+import Intersect from "../Core/Intersect.js";
+import Matrix4 from "../Core/Matrix4.js";
+import PixelFormat from "../Core/PixelFormat.js";
+import PixelDatatype from "../Renderer/PixelDatatype.js";
+import Plane from "../Core/Plane.js";
+import Sampler from "../Renderer/Sampler.js";
+import Texture from "../Renderer/Texture.js";
+
+/**
+ * Specifies a set of clipping planes defining rendering bounds for a {@link VoxelPrimitive}.
+ *
+ * @alias VoxelBoundsCollection
+ * @constructor
+ *
+ * @param {object} [options] Object with the following properties:
+ * @param {ClippingPlane[]} [options.planes=[]] An array of {@link ClippingPlane} objects used to selectively disable rendering on the outside of each plane.
+ * @param {Matrix4} [options.modelMatrix=Matrix4.IDENTITY] The 4x4 transformation matrix specifying an additional transform relative to the clipping planes original coordinate system.
+ * @param {boolean} [options.unionClippingRegions=false] If true, a region will be clipped if it is on the outside of any plane in the collection. Otherwise, a region will only be clipped if it is on the outside of every plane.
+ *
+ * @private
+ */
+function VoxelBoundsCollection(options) {
+  const {
+    planes,
+    modelMatrix = Matrix4.IDENTITY,
+    unionClippingRegions = false,
+  } = options ?? Frozen.EMPTY_OBJECT;
+
+  this._planes = [];
+
+  /**
+   * The 4x4 transformation matrix specifying an additional transform relative to the clipping planes
+   * original coordinate system.
+   *
+   * @type {Matrix4}
+   * @default Matrix4.IDENTITY
+   */
+  this.modelMatrix = Matrix4.clone(modelMatrix);
+
+  /**
+   * An event triggered when a new clipping plane is added to the collection.  Event handlers
+   * are passed the new plane and the index at which it was added.
+   * @type {Event}
+   * @readonly
+   */
+  this.planeAdded = new Event();
+
+  /**
+   * An event triggered when a new clipping plane is removed from the collection.  Event handlers
+   * are passed the new plane and the index from which it was removed.
+   * @type {Event}
+   * @readonly
+   */
+  this.planeRemoved = new Event();
+
+  this._unionClippingRegions = unionClippingRegions;
+  this._testIntersection = unionClippingRegions
+    ? unionIntersectFunction
+    : defaultIntersectFunction;
+
+  this._float32View = undefined;
+
+  this._clippingPlanesTexture = undefined;
+
+  // Add each ClippingPlane object.
+  if (defined(planes)) {
+    for (let i = 0; i < planes.length; ++i) {
+      this.add(planes[i]);
+    }
+  }
+}
+
+function unionIntersectFunction(value) {
+  return value === Intersect.OUTSIDE;
+}
+
+function defaultIntersectFunction(value) {
+  return value === Intersect.INSIDE;
+}
+
+Object.defineProperties(VoxelBoundsCollection.prototype, {
+  /**
+   * Returns the number of planes in this collection.  This is commonly used with
+   * {@link VoxelBoundsCollection#get} to iterate over all the planes
+   * in the collection.
+   *
+   * @memberof VoxelBoundsCollection.prototype
+   * @type {number}
+   * @readonly
+   */
+  length: {
+    get: function () {
+      return this._planes.length;
+    },
+  },
+
+  /**
+   * If true, a region will be clipped if it is on the outside of any plane in the
+   * collection. Otherwise, a region will only be clipped if it is on the
+   * outside of every plane.
+   *
+   * @memberof VoxelBoundsCollection.prototype
+   * @type {boolean}
+   * @default false
+   */
+  unionClippingRegions: {
+    get: function () {
+      return this._unionClippingRegions;
+    },
+    set: function (value) {
+      //>>includeStart('debug', pragmas.debug);
+      Check.typeOf.bool("value", value);
+      //>>includeEnd('debug');
+      if (this._unionClippingRegions === value) {
+        return;
+      }
+      this._unionClippingRegions = value;
+      this._testIntersection = value
+        ? unionIntersectFunction
+        : defaultIntersectFunction;
+    },
+  },
+
+  /**
+   * Returns a texture containing packed, untransformed clipping planes.
+   *
+   * @memberof VoxelBoundsCollection.prototype
+   * @type {Texture}
+   * @readonly
+   * @private
+   */
+  texture: {
+    get: function () {
+      return this._clippingPlanesTexture;
+    },
+  },
+
+  /**
+   * Returns a Number encapsulating the state for this VoxelBoundsCollection.
+   *
+   * Clipping mode is encoded in the sign of the number, which is just the plane count.
+   * If this value changes, then shader regeneration is necessary.
+   *
+   * @memberof VoxelBoundsCollection.prototype
+   * @returns {number} A Number that describes the VoxelBoundsCollection's state.
+   * @readonly
+   * @private
+   */
+  clippingPlanesState: {
+    get: function () {
+      return this._unionClippingRegions
+        ? this._planes.length
+        : -this._planes.length;
+    },
+  },
+});
+
+/**
+ * Adds the specified {@link ClippingPlane} to the collection to be used to selectively disable rendering
+ * on the outside of each plane. Use {@link VoxelBoundsCollection#unionClippingRegions} to modify
+ * how modify the clipping behavior of multiple planes.
+ *
+ * @param {ClippingPlane} plane The ClippingPlane to add to the collection.
+ *
+ * @see VoxelBoundsCollection#unionClippingRegions
+ * @see VoxelBoundsCollection#remove
+ * @see VoxelBoundsCollection#removeAll
+ */
+VoxelBoundsCollection.prototype.add = function (plane) {
+  const newPlaneIndex = this._planes.length;
+  plane.index = newPlaneIndex;
+  this._planes.push(plane);
+  this.planeAdded.raiseEvent(plane, newPlaneIndex);
+};
+
+/**
+ * Returns the plane in the collection at the specified index.  Indices are zero-based
+ * and increase as planes are added.  Removing a plane shifts all planes after
+ * it to the left, changing their indices.  This function is commonly used with
+ * {@link VoxelBoundsCollection#length} to iterate over all the planes
+ * in the collection.
+ *
+ * @param {number} index The zero-based index of the plane.
+ * @returns {ClippingPlane} The ClippingPlane at the specified index.
+ *
+ * @see VoxelBoundsCollection#length
+ */
+VoxelBoundsCollection.prototype.get = function (index) {
+  //>>includeStart('debug', pragmas.debug);
+  Check.typeOf.number("index", index);
+  //>>includeEnd('debug');
+
+  return this._planes[index];
+};
+
+function indexOf(planes, plane) {
+  for (let i = 0; i < planes.length; ++i) {
+    if (Plane.equals(planes[i], plane)) {
+      return i;
+    }
+  }
+  return -1;
+}
+
+/**
+ * Checks whether this collection contains a ClippingPlane equal to the given ClippingPlane.
+ *
+ * @param {ClippingPlane} [clippingPlane] The ClippingPlane to check for.
+ * @returns {boolean} true if this collection contains the ClippingPlane, false otherwise.
+ *
+ * @see VoxelBoundsCollection#get
+ */
+VoxelBoundsCollection.prototype.contains = function (clippingPlane) {
+  return indexOf(this._planes, clippingPlane) !== -1;
+};
+
+/**
+ * Removes the first occurrence of the given ClippingPlane from the collection.
+ *
+ * @param {ClippingPlane} clippingPlane
+ * @returns {boolean} <code>true</code> if the plane was removed; <code>false</code> if the plane was not found in the collection.
+ *
+ * @see VoxelBoundsCollection#add
+ * @see VoxelBoundsCollection#contains
+ * @see VoxelBoundsCollection#removeAll
+ */
+VoxelBoundsCollection.prototype.remove = function (clippingPlane) {
+  const planes = this._planes;
+  const index = indexOf(planes, clippingPlane);
+
+  if (index === -1) {
+    return false;
+  }
+
+  // Unlink this VoxelBoundsCollection from the ClippingPlane
+  if (clippingPlane instanceof ClippingPlane) {
+    clippingPlane.onChangeCallback = undefined;
+    clippingPlane.index = -1;
+  }
+
+  // Shift and update indices
+  const length = planes.length - 1;
+  for (let i = index; i < length; ++i) {
+    const planeToKeep = planes[i + 1];
+    planes[i] = planeToKeep;
+    if (planeToKeep instanceof ClippingPlane) {
+      planeToKeep.index = i;
+    }
+  }
+
+  planes.length = length;
+
+  this.planeRemoved.raiseEvent(clippingPlane, index);
+
+  return true;
+};
+
+/**
+ * Removes all planes from the collection.
+ *
+ * @see VoxelBoundsCollection#add
+ * @see VoxelBoundsCollection#remove
+ */
+VoxelBoundsCollection.prototype.removeAll = function () {
+  // Dereference this VoxelBoundsCollection from all ClippingPlanes
+  const planes = this._planes;
+  for (let i = 0; i < planes.length; ++i) {
+    const plane = planes[i];
+    if (plane instanceof ClippingPlane) {
+      plane.onChangeCallback = undefined;
+      plane.index = -1;
+    }
+    this.planeRemoved.raiseEvent(plane, i);
+  }
+  this._planes = [];
+};
+
+const scratchPlane = new Plane(Cartesian3.fromElements(1.0, 0.0, 0.0), 0.0);
+
+// Pack starting at the beginning of the buffer to allow partial update
+function transformAndPackPlanes(clippingPlaneCollection, transform) {
+  const float32View = clippingPlaneCollection._float32View;
+  const planes = clippingPlaneCollection._planes;
+
+  let floatIndex = 0;
+  for (let i = 0; i < planes.length; ++i) {
+    const { normal, distance } = transformPlane(
+      planes[i],
+      transform,
+      scratchPlane,
+    );
+
+    float32View[floatIndex] = normal.x;
+    float32View[floatIndex + 1] = normal.y;
+    float32View[floatIndex + 2] = normal.z;
+    float32View[floatIndex + 3] = distance;
+
+    floatIndex += 4; // each plane is 4 floats
+  }
+}
+
+const scratchPlaneCartesian4 = new Cartesian4();
+const scratchTransformedNormal = new Cartesian3();
+
+function transformPlane(plane, transform, result) {
+  //>>includeStart('debug', pragmas.debug);
+  Check.typeOf.object("plane", plane);
+  Check.typeOf.object("transform", transform);
+  //>>includeEnd('debug');
+
+  const { normal, distance } = plane;
+  const planeAsCartesian4 = Cartesian4.fromElements(
+    normal.x,
+    normal.y,
+    normal.z,
+    distance,
+    scratchPlaneCartesian4,
+  );
+  let transformedPlane = Matrix4.multiplyByVector(
+    transform,
+    planeAsCartesian4,
+    scratchPlaneCartesian4,
+  );
+
+  // Convert the transformed plane to Hessian Normal Form
+  const transformedNormal = Cartesian3.fromCartesian4(
+    transformedPlane,
+    scratchTransformedNormal,
+  );
+  transformedPlane = Cartesian4.divideByScalar(
+    transformedPlane,
+    Cartesian3.magnitude(transformedNormal),
+    scratchPlaneCartesian4,
+  );
+
+  return Plane.fromCartesian4(transformedPlane, result);
+}
+
+function computeTextureResolution(pixelsNeeded, result) {
+  result.x = Math.min(pixelsNeeded, ContextLimits.maximumTextureSize);
+  result.y = Math.ceil(pixelsNeeded / result.x);
+  return result;
+}
+
+const textureResolutionScratch = new Cartesian2();
+/**
+ * Called when {@link Viewer} or {@link CesiumWidget} render the scene to
+ * build the resources for clipping planes.
+ * <p>
+ * Do not call this function directly.
+ * </p>
+ */
+VoxelBoundsCollection.prototype.update = function (frameState, transform) {
+  let clippingPlanesTexture = this._clippingPlanesTexture;
+
+  // Compute texture requirements for current planes
+  // In RGBA FLOAT, a plane is 4 floats packed to a single RGBA pixel.
+  const pixelsNeeded = this.length;
+
+  if (defined(clippingPlanesTexture)) {
+    const currentPixelCount =
+      clippingPlanesTexture.width * clippingPlanesTexture.height;
+    // Recreate the texture to double current requirement if it isn't big enough or is 4 times larger than it needs to be.
+    // Optimization note: this isn't exactly the classic resizeable array algorithm
+    // * not necessarily checking for resize after each add/remove operation
+    // * random-access deletes instead of just pops
+    // * alloc ops likely more expensive than demonstrable via big-O analysis
+    if (
+      currentPixelCount < pixelsNeeded ||
+      pixelsNeeded < 0.25 * currentPixelCount
+    ) {
+      clippingPlanesTexture.destroy();
+      clippingPlanesTexture = undefined;
+      this._clippingPlanesTexture = undefined;
+    }
+  }
+
+  // If there are no bound planes, there's nothing to update.
+  if (this.length === 0) {
+    return;
+  }
+
+  if (!defined(clippingPlanesTexture)) {
+    const requiredResolution = computeTextureResolution(
+      pixelsNeeded,
+      textureResolutionScratch,
+    );
+    // Allocate twice as much space as needed to avoid frequent texture reallocation.
+    // Allocate in the Y direction, since texture may be as wide as context texture support.
+    requiredResolution.y *= 2;
+
+    clippingPlanesTexture = new Texture({
+      context: frameState.context,
+      width: requiredResolution.x,
+      height: requiredResolution.y,
+      pixelFormat: PixelFormat.RGBA,
+      pixelDatatype: PixelDatatype.FLOAT,
+      sampler: Sampler.NEAREST,
+      flipY: false,
+    });
+    this._float32View = new Float32Array(
+      requiredResolution.x * requiredResolution.y * 4,
+    );
+
+    this._clippingPlanesTexture = clippingPlanesTexture;
+  }
+
+  const { width, height } = clippingPlanesTexture;
+  transformAndPackPlanes(this, transform);
+  clippingPlanesTexture.copyFrom({
+    source: {
+      width: width,
+      height: height,
+      arrayBufferView: this._float32View,
+    },
+  });
+};
+
+/**
+ * Function for getting the clipping plane collection's texture resolution.
+ * If the VoxelBoundsCollection hasn't been updated, returns the resolution that will be
+ * allocated based on the current plane count.
+ *
+ * @param {VoxelBoundsCollection} clippingPlaneCollection The clipping plane collection
+ * @param {Context} context The rendering context
+ * @param {Cartesian2} result A Cartesian2 for the result.
+ * @returns {Cartesian2} The required resolution.
+ * @private
+ */
+VoxelBoundsCollection.getTextureResolution = function (
+  clippingPlaneCollection,
+  context,
+  result,
+) {
+  const texture = clippingPlaneCollection.texture;
+  if (defined(texture)) {
+    result.x = texture.width;
+    result.y = texture.height;
+    return result;
+  }
+
+  const pixelsNeeded = clippingPlaneCollection.length;
+  const requiredResolution = computeTextureResolution(pixelsNeeded, result);
+
+  // Allocate twice as much space as needed to avoid frequent texture reallocation.
+  requiredResolution.y *= 2;
+  return requiredResolution;
+};
+
+/**
+ * Returns true if this object was destroyed; otherwise, false.
+ * <br /><br />
+ * If this object was destroyed, it should not be used; calling any function other than
+ * <code>isDestroyed</code> will result in a {@link DeveloperError} exception.
+ *
+ * @returns {boolean} <code>true</code> if this object was destroyed; otherwise, <code>false</code>.
+ *
+ * @see VoxelBoundsCollection#destroy
+ */
+VoxelBoundsCollection.prototype.isDestroyed = function () {
+  return false;
+};
+
+/**
+ * Destroys the WebGL resources held by this object.  Destroying an object allows for deterministic
+ * release of WebGL resources, instead of relying on the garbage collector to destroy this object.
+ * <br />
+ * Once an object is destroyed, it should not be used; calling any function other than
+ * <code>isDestroyed</code> will result in a {@link DeveloperError} exception.  Therefore,
+ * assign the return value (<code>undefined</code>) to the object as done in the example.
+ *
+ * @exception {DeveloperError} This object was destroyed, i.e., destroy() was called.
+ *
+ * @example
+ * voxelBounds = voxelBounds && voxelBounds.destroy();
+ *
+ * @see VoxelBoundsCollection#isDestroyed
+ */
+VoxelBoundsCollection.prototype.destroy = function () {
+  this._clippingPlanesTexture =
+    this._clippingPlanesTexture && this._clippingPlanesTexture.destroy();
+  return destroyObject(this);
+};
+export default VoxelBoundsCollection;