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import DeveloperError from "../../Core/DeveloperError.js";
import Matrix4 from "../../Core/Matrix4.js";
import Check from "../../Core/Check.js";
import destroyObject from "../../Core/destroyObject.js";
import ImageryState from "../ImageryState.js";
import ImageryCoverage from "./ImageryCoverage.js";
import ModelImageryMapping from "./ModelImageryMapping.js";
import ModelUtility from "./ModelUtility.js";
import MappedPositions from "./MappedPositions.js";
import Buffer from "../../Renderer/Buffer.js";
import BufferUsage from "../../Renderer/BufferUsage.js";
/**
* A class managing the draping of imagery on a single model primitive.
*
* The <code>ModelImagery</code> class creates one instance of this
* class for each primitive that appears in the model.
*
* It is responsible for computing
* - the mapped (cartographic) positions of the primitive
* - the imagery tiles that are covered by these mapped positions
* - the texture coordinates (attributes) that correspond to these mapped positions
*
* @private
*/
class ModelPrimitiveImagery {
/**
* Creates a new instance
*
* @param {Model} model The model
* @param {ModelRuntimeNode} runtimeNode The node that the primitive is attached to
* @param {ModelRuntimePrimitive} runtimePrimitive The primitive
* @throws {DeveloperError} If any argument is not defined
*/
constructor(model, runtimeNode, runtimePrimitive) {
//>>includeStart('debug', pragmas.debug);
Check.defined("model", model);
Check.defined("runtimeNode", runtimeNode);
Check.defined("runtimePrimitive", runtimePrimitive);
//>>includeEnd('debug');
/**
* The model that this instance was created for.
*
* @type {Model}
* @readonly
* @private
*/
this._model = model;
/**
* The node that the primitive is attached to
*
* @type {ModelRuntimeNode}
* @readonly
* @private
*/
this._runtimeNode = runtimeNode;
/**
* The primitive that this instance was created for.
*
* @type {ModelRuntimePrimitive}
* @readonly
* @private
*/
this._runtimePrimitive = runtimePrimitive;
/**
* The <code>MappedPositions</code> objects, one for each ellipsoid
* of one of the imagery layers
*
* These objects are just plain structures that summarize the
* cartographic positions of the primitive for one specific
* ellipsoid
*
* @type {MappedPositions[]|undefined}
* @private
*/
this._mappedPositionsPerEllipsoid = undefined;
/**
* The last <code>model.modelMatrix</code> for which the mapped
* positions have been computed.
*
* This is used for detecting changes in the model matrix that
* make it necessary to re-compute the mapped positions.
*
* @type {Matrix4}
* @readonly
* @private
*/
this._mappedPositionsModelMatrix = new Matrix4();
/**
* The value that the <code>Cesium3DTileset.imageryLayersModificationCounter</code>
* had during the last update call. This is used for triggering updates when the
* imagery layer collection in the tileset changes.
*/
this._lastImageryLayersModificationCounter = 0;
/**
* The texture coordinate attributes, one for each projection.
*
* This contains one <code>ModelComponents.Attribute</code> for each
* unique projection that is used in the imagery layers. These
* texture coordinate attributes are computed based on the mapped
* positions for the respective ellipsoid of that projection.
*/
this._imageryTexCoordAttributesPerProjection = undefined;
/**
* The current imagery layers.
*
* This is initialized when the _coveragesPerLayer are computed,
* and tracked to that the reference counters of the imageries
* can be decreased when the coverages per layer are deleted.
*
* @type {ImageryLayer[]|undefined}
* @private
*/
this._currentImageryLayers = undefined;
/**
* Information about the imagery tiles that are covered by the positions
* of the primitive.
*
* This is computed in the <code>update</code> function, based on the
* mapped positions of the primitive. After this computation,
* <code>_coveragesPerLayer[layerIndex]</code> is an array that contains
* the <code>ImageryCoverage</code> objects that describe the imagery
* tiles that are covered, including their texture coordinate rectangle.
*
* @type {ImageryCoverage[][]|undefined}
* @private
*/
this._coveragesPerLayer = undefined;
/**
* A flag indicating whether all imagery objects that are covered
* are "ready".
*
* This is initially <code>false</code>. During the calls to the
* <code>update</code> function (which are triggered from the
* <code>Model.update</code> function, each frame), the
* <code>_updateImageries</code> function will be called, and
* process the imagery tiles, until all them them are in a
* state like <code>ImageryState.READY</code>, at which point
* this flag is set to <code>true</code>.
*
* @type {boolean}
* @private
*/
this._allImageriesReady = false;
}
/**
* Returns the <code>ImageryCoverage</code> array that has been
* computed for the given imagery layer.
*
* This assumes that the given imagery layer is part of the
* imagery layer collection of the model, and that this
* model primitive imagery is "ready", meaning that the
* coverages have already been computed.
*
* Clients may <b>not</b> modify the returned array or any
* of its objects!
*
* @param {ImageryLayer} imageryLayer The imagery layer
* @returns {ImageryCoverage[]} The coverage information
*/
coveragesForImageryLayer(imageryLayer) {
const model = this._model;
const imageryLayers = model.imageryLayers;
const index = imageryLayers.indexOf(imageryLayer);
if (index === -1) {
throw new DeveloperError("Imagery layer is not part of the model");
}
const coveragesPerLayer = this._coveragesPerLayer;
if (!defined(coveragesPerLayer)) {
throw new DeveloperError(
`The coveragesPerLayer have not been computed yet`,
);
}
return coveragesPerLayer[index];
}
/**
* Update the state of this instance.
*
* This is called as part of <code>ModelImagery.update</code>, which in
* turn is part of the <code>Model.update</code> that is called in each
* frame.
*
* This will perform the computations that are required to establish
* the mapping between the imagery and the primitive. It will...
* <ul>
* <li>
* Compute the <code>MappedPositions</code> of the primitive,
* one instance for each ellipsoid
* </li>
* <li>
* Compute the "coverages per layer", containing the information
* about which parts of the respective imagery layer are covered
* by the mapped positions
* </li>
* <li>
* Compute the texture coordinate attributes for the imagery, one
* for each projection, and store them as the
* <code>_imageryTexCoordAttributesPerProjection</code>
* </li>
* <li>
* Update the imageries (i.e. processing their state machine by
* calling <code>Imagery.processStateMachine</code>) until they
* are in the <code>ImageryState.READY</code> state
* </li>
* </ul>
*
* @param {FrameState} frameState The frame state
*/
update(frameState) {
//>>includeStart('debug', pragmas.debug);
Check.defined("frameState", frameState);
//>>includeEnd('debug');
// If the imagery layers have been modified since the last call
// to this function, then re-build everything
const model = this._model;
const content = model.content;
const tileset = content.tileset;
const modificationCounter = tileset.imageryLayersModificationCounter;
Eif (this._lastImageryLayersModificationCounter !== modificationCounter) {
delete this._mappedPositionsPerEllipsoid;
this._lastImageryLayersModificationCounter = modificationCounter;
}
Eif (this._mappedPositionsNeedUpdate) {
model.resetDrawCommands();
this._mappedPositionsPerEllipsoid =
this._computeMappedPositionsPerEllipsoid();
this._deleteCoveragesPerLayer();
this._destroyImageryTexCoordAttributes();
}
if (!defined(this._imageryTexCoordAttributesPerProjection)) {
this._imageryTexCoordAttributesPerProjection =
this._computeImageryTexCoordsAttributesPerProjection();
this._uploadImageryTexCoordAttributes(frameState.context);
}
if (!defined(this._coveragesPerLayer)) {
this._computeCoveragesPerLayer();
this._allImageriesReady = false;
}
if (!this._allImageriesReady) {
this._updateImageries(frameState);
}
}
/**
* Delete the <code>_coveragesPerLayer</code> if they are defined.
*
* This will call <code>deleteCoverages</code> for each set of coverages,
* and eventually delete the <code>_coveragesPerLayer</code>.
*
* This will cause the reference counters of the imageries to be
* decreased.
*/
_deleteCoveragesPerLayer() {
const coveragesPerLayer = this._coveragesPerLayer;
if (!defined(coveragesPerLayer)) {
return;
}
const imageryLayers = this._currentImageryLayers;
const length = coveragesPerLayer.length;
for (let i = 0; i < length; i++) {
const imageryLayer = imageryLayers[i];
const coverages = coveragesPerLayer[i];
this._deleteCoverages(imageryLayer, coverages);
}
delete this._currentImageryLayers;
delete this._coveragesPerLayer;
}
/**
* Delete the given imagery coverage objects for the given imagery
* layer, meaning that it will cause the reference counters of the
* imageries to be decreased.
*
* If the imagery layer already has been destroyed, then nothing
* will be done.
*
* @param {ImageryLayer} imageryLayer The imagery layer
* @param {ImageryCoverage[]} coverages The coverages
*/
_deleteCoverages(imageryLayer, coverages) {
if (imageryLayer.isDestroyed()) {
return;
}
const length = coverages.length;
for (let i = 0; i < length; i++) {
const coverage = coverages[i];
const imagery = coverage.imagery;
imagery.releaseReference();
}
}
/**
* Create the GPU buffers for the typed arrays that are contained
* in the <code>_imageryTexCoordAttributesPerProjection</code>
*
* @param {Context} context The GL context
*/
_uploadImageryTexCoordAttributes(context) {
//>>includeStart('debug', pragmas.debug);
Check.defined("context", context);
//>>includeEnd('debug');
const attributes = this._imageryTexCoordAttributesPerProjection;
if (!defined(attributes)) {
return;
}
const n = attributes.length;
for (let i = 0; i < n; i++) {
const attribute = attributes[i];
// Allocate the GL resources for the new attribute
const imageryTexCoordBuffer = Buffer.createVertexBuffer({
context: context,
typedArray: attribute.typedArray,
usage: BufferUsage.STATIC_DRAW,
});
// TODO_DRAPING Review this. Probably, some cleanup
// has to happen somewhere else after setting this.
// Check that the call to "destroy" in
// _destroyImageryTexCoordAttributes is the right
// thing to do here.
imageryTexCoordBuffer.vertexArrayDestroyable = false;
attribute.buffer = imageryTexCoordBuffer;
}
}
/**
* Destroy the <code>_imageryTexCoordAttributesPerProjection</code>
* array.
*
* This is called for cleaning up the allocated GPU resources, before
* they are supposed to be re-computed with
* <code>_computeImageryTexCoordsAttributesPerProjection</code>
*/
_destroyImageryTexCoordAttributes() {
const attributes = this._imageryTexCoordAttributesPerProjection;
if (!defined(attributes)) {
return;
}
const n = attributes.length;
for (let i = 0; i < n; i++) {
const attribute = attributes[i];
if (defined(attribute)) {
if (defined(attribute.buffer)) {
if (!attribute.buffer.isDestroyed()) {
attribute.buffer.destroy();
}
}
attributes[i] = undefined;
}
}
delete this._imageryTexCoordAttributesPerProjection;
}
/**
* Returns whether the <code>MappedPositions</code> have to be
* re-computed with <code>_computeMappedPositionsPerEllipsoid</code>.
*
* This is <code>true</code> when the positions have not yet been
* computed, or when the <code>modelMatrix</code> of the model
* changed since the previous call.
*
* @returns {boolean} Whether the mapped positions need an update
* @private
*/
get _mappedPositionsNeedUpdate() {
Eif (!defined(this._mappedPositionsPerEllipsoid)) {
return true;
}
const model = this._model;
const lastModelMatrix = this._mappedPositionsModelMatrix;
if (!Matrix4.equals(model.modelMatrix, lastModelMatrix)) {
return true;
}
return false;
}
/**
* Computes the mapped positions of the primitive, one for each ellipsoid.
*
* This computes the <i>unique</i> ellipsoids that appear in the imagery
* layers of the model, and creates one <code>MappedPositions</code>
* object for each of them.
*
* The respective <code>MappedPositions</code> objects will contain
* the cartographic positions that are computed from the positions
* of the primitive. These will serve as the basis for computing the
* part of the imagery that is covered by the primitive.
*
* These mapped positions depend on the current <code>modelMatrix</code>
* of the model. So they have to be re-computed when the model matrix
* changes.
*
* @returns {MappedPositions[]} The mapped positions
* @private
*/
_computeMappedPositionsPerEllipsoid() {
const model = this._model;
const runtimeNode = this._runtimeNode;
const runtimePrimitive = this._runtimePrimitive;
const primitivePositionAttribute =
ModelPrimitiveImagery._obtainPrimitivePositionAttribute(
runtimePrimitive.primitive,
);
const numPositions = primitivePositionAttribute.count;
const primitivePositionTransform =
ModelPrimitiveImagery._computePrimitivePositionTransform(
model,
runtimeNode,
undefined,
);
const mappedPositionsPerEllipsoid = [];
const ellipsoids = ModelPrimitiveImagery._computeUniqueEllipsoids(
model.imageryLayers,
);
const length = ellipsoids.length;
for (let i = 0; i < length; i++) {
const ellipsoid = ellipsoids[i];
const cartographicPositions =
ModelImageryMapping.createCartographicPositions(
primitivePositionAttribute,
primitivePositionTransform,
ellipsoid,
);
const cartographicBoundingRectangle =
ModelImageryMapping.computeCartographicBoundingRectangle(
cartographicPositions,
);
const mappedPositions = new MappedPositions(
cartographicPositions,
numPositions,
cartographicBoundingRectangle,
ellipsoid,
);
mappedPositionsPerEllipsoid.push(mappedPositions);
}
Matrix4.clone(model.modelMatrix, this._mappedPositionsModelMatrix);
return mappedPositionsPerEllipsoid;
}
/**
* Computes an array containing the <i>unique</i> ellipsoids that
* appear in the imagery layers of the given collection.
*
* @param {ImageryLayerCollection} imageryLayers
* @returns {Ellipsoid[]} The ellipsoids
* @private
*/
static _computeUniqueEllipsoids(imageryLayers) {
//>>includeStart('debug', pragmas.debug);
Check.defined("imageryLayers", imageryLayers);
//>>includeEnd('debug');
const ellipsoidsSet = new Set();
const length = imageryLayers.length;
for (let i = 0; i < length; i++) {
const imageryLayer = imageryLayers.get(i);
const ellipsoid = ModelPrimitiveImagery._getEllipsoid(imageryLayer);
ellipsoidsSet.add(ellipsoid);
}
return [...ellipsoidsSet];
}
/**
* Computes one coordinate attribute for each unique projection
* that is used in the imagery layers.
*
* This is taking the mapped positions, projecting them with
* the respective projection, and creating a texture coordinate
* attribute that describes the texture coordinates of these
* positions, relative to the cartographic bounding rectangle
* of the mapped positions.
*
* @returns {ModelComponents.Attribute[]} The attributes
*/
_computeImageryTexCoordsAttributesPerProjection() {
const model = this._model;
const imageryLayers = model.imageryLayers;
// Compute the arrays containing ALL projections and the array
// containing the UNIQUE projections from the imagery layers.
// Texture coordinate attributes only have to be created once
// for each projection.
const allProjections =
ModelPrimitiveImagery._extractProjections(imageryLayers);
const uniqueProjections = [...new Set(allProjections)];
// Create one texture coordinate attribute for each distinct
// projection that is used in the imagery layers
const attributes = this._createImageryTexCoordAttributes(uniqueProjections);
return attributes;
}
/**
* Computes an array containing the projections that are used in
* the given imagery layers.
*
* (Note that this array may contain duplicates)
*
* @param {ImageryLayerCollection} imageryLayers The imagery layers
* @returns {MapProjection[]} The projections
* @private
*/
static _extractProjections(imageryLayers) {
//>>includeStart('debug', pragmas.debug);
Check.defined("imageryLayers", imageryLayers);
//>>includeEnd('debug');
const projections = [];
const length = imageryLayers.length;
for (let i = 0; i < length; i++) {
const imageryLayer = imageryLayers.get(i);
const projection = ModelPrimitiveImagery._getProjection(imageryLayer);
projections.push(projection);
}
return projections;
}
/**
* Returns the projection of the given imagery layer.
*
* This only exists to hide a train wreck
*
* @param {ImageryLayer} imageryLayer The imagery layer
* @returns {MapProjection} The projection
* @private
*/
static _getProjection(imageryLayer) {
//>>includeStart('debug', pragmas.debug);
Check.defined("imageryLayer", imageryLayer);
//>>includeEnd('debug');
const projection = imageryLayer.imageryProvider.tilingScheme.projection;
return projection;
}
/**
* Create texture coordinates, one for each projection.
*
* This will create a texture coordinate attribute for each of the given projections,
* using <code>ModelImageryMapping.createTextureCoordinatesAttributeForMappedPositions</code>,
*
* (This means that the given projections should indeed be unique,
* i.e. contain no duplicates)
*
* @param {MapProjection[]} uniqueProjections The projections
* @returns {ModelComponents.Attribute[]} The attributes
*/
_createImageryTexCoordAttributes(uniqueProjections) {
//>>includeStart('debug', pragmas.debug);
Check.defined("uniqueProjections", uniqueProjections);
//>>includeEnd('debug');
const imageryTexCoordAttributePerUniqueProjection = [];
const length = uniqueProjections.length;
for (let i = 0; i < length; i++) {
// Obtain the mapped positions for the ellipsoid that is used
// in the projection (i.e. the cartographic positions of the
// primitive, for the respective ellipsoid)
const projection = uniqueProjections[i];
const ellipsoid = projection.ellipsoid;
const mappedPositions = this.mappedPositionsForEllipsoid(ellipsoid);
// Create the actual attribute
const imageryTexCoordAttribute =
ModelImageryMapping.createTextureCoordinatesAttributeForMappedPositions(
mappedPositions,
projection,
);
imageryTexCoordAttributePerUniqueProjection.push(
imageryTexCoordAttribute,
);
}
return imageryTexCoordAttributePerUniqueProjection;
}
/**
* Compute the coverage information for the primitive, based on the
* imagery layers that are associated with the model.
*
* This updates the <code>_coveragesPerLayer[layerIndex]</code>, which
* is an array that contains the <code>ImageryCoverage</code> objects that
* describe the imagery tiles that are covered by the primitive, including
* their texture coordinate rectangle.
*
* This has to be called after the mapped positions for the primitive
* have been computed with <code>_computeMappedPositionsPerEllipsoid</code>.
*
* @private
*/
_computeCoveragesPerLayer() {
const coveragesPerLayer = [];
const currentImageryLayers = [];
const model = this._model;
const imageryLayers = model.imageryLayers;
const length = imageryLayers.length;
for (let i = 0; i < length; i++) {
const imageryLayer = imageryLayers.get(i);
const coverages = this._computeCoverage(imageryLayer);
coveragesPerLayer.push(coverages);
currentImageryLayers.push(imageryLayer);
}
this._coveragesPerLayer = coveragesPerLayer;
this._currentImageryLayers = currentImageryLayers;
}
/**
* Compute the coverage information for the primitive, based on the
* given imagery layer.
*
* This returns an array that contains the <code>ImageryCoverage</code>
* objects that describe the imagery tiles that are covered by the
* primitive, including their texture coordinate rectangle.
*
* This has to be called after the mapped positions for the primitive
* have been computed with <code>_computeMappedPositionsPerEllipsoid</code>.
*
* @param {ImageryLayer} imageryLayer The imagery layer
* @returns {ImageryCoverage[]} The coverage information
* @private
*/
_computeCoverage(imageryLayer) {
const mappedPositions = this.mappedPositionsForImageryLayer(imageryLayer);
const cartographicBoundingRectangle =
mappedPositions.cartographicBoundingRectangle;
const imageryLevel = this._computeImageryLevel(
imageryLayer,
cartographicBoundingRectangle,
);
const coverages = ImageryCoverage.createImageryCoverages(
cartographicBoundingRectangle,
imageryLayer,
imageryLevel,
);
return coverages;
}
/**
* Compute a <code>level</code> for accessing the imagery from the given
* imagery layer that is suitable for a primitive with the given bounding
* rectangle.
*
* @param {ImageryLayer} imageryLayer The imagery layer
* @param {Rectangle} cartographicBoundingRectangle The cartographic
* bounding rectangle, as obtained from the MappedPositions for
* the given imagery layer
* @returns {number} The imagery level
*/
_computeImageryLevel(imageryLayer, cartographicBoundingRectangle) {
const imageryProvider = imageryLayer.imageryProvider;
const tilingScheme = imageryProvider.tilingScheme;
const rectangle = tilingScheme.rectangle;
// The number of tiles covered by the boundingRectangle (b)
// for a certain level, based on the tiling scheme rectangle (r) is
// numberOfTilesCovered = b / (r / 2^level)
// Solving for "level" yields
// level = log2( numberOfTilesCovered * r / b)
// The goal here is to drape approximately (!) one imagery
// tile on each primitive. In practice, it may be more
// (up to 9 in theory)
const desiredNumberOfTilesCovered = 1;
// Perform the computation of the desired level, based on the
// number of tiles that should be covered (by whatever is
// larger, the width or the height)
let boundingRectangleSize = cartographicBoundingRectangle.width;
let rectangleSize = rectangle.width;
if (
cartographicBoundingRectangle.height > cartographicBoundingRectangle.width
) {
boundingRectangleSize = cartographicBoundingRectangle.height;
rectangleSize = rectangle.height;
}
const desiredLevel = Math.log2(
(desiredNumberOfTilesCovered * rectangleSize) / boundingRectangleSize,
);
// Clamp the level to a valid range, and an integer value
const imageryLevel = ImageryCoverage._clampImageryLevel(
imageryProvider,
desiredLevel,
);
return imageryLevel;
}
/**
* Update all <code>Imagery</code> objects.
*
* This is called as part of <code>update</code>, until all required
* imagery tiles are "ready", as indicated by their <code>state</code>
* being <code>ImageryState.READY</code>.
*
* This is called after it has been determined which imagery tiles are
* covered by the primitive (i.e. after the <code>_coveragesPerLayer</code>
* have been computed by calling <code>_computeCoverages</code>).
*
* For each covered imagery tile, this will call
* <code>Imagery.processStateMachine</code> until they are either
* READY, FAILED, or INVALID.
*
* Once they all are in one of these final states, it will set the
* <code>_allImageriesReady</code> flag to <code>true</code>.
*
* @param {FrameState} frameState The frame state, to be passed to
* <code>imagery.processStateMachine</code>
* @private
*/
_updateImageries(frameState) {
const model = this._model;
const coveragesPerLayer = this._coveragesPerLayer;
const length = coveragesPerLayer.length;
let allImageriesReady = true;
for (let i = 0; i < length; i++) {
const coverages = coveragesPerLayer[i];
const n = coverages.length;
for (let j = 0; j < n; j++) {
const coverage = coverages[j];
const imagery = coverage.imagery;
// In the context of loading the imagery for draping
// it over the primitive, the imagery counts as "ready"
// when it is really ready, but also when it failed
// or was invalid (otherwise, the primitive would
// never turn "ready"
const countsAsReady =
imagery.state === ImageryState.READY ||
imagery.state === ImageryState.FAILED ||
imagery.state === ImageryState.INVALID;
if (!countsAsReady) {
allImageriesReady = false;
imagery.processStateMachine(frameState, false, false);
}
}
}
// When the imageries turned ready, reset the draw commands
// to trigger a rendering with the updated draw commands
// that include the imagery now.
if (allImageriesReady) {
model.resetDrawCommands();
}
this._allImageriesReady = allImageriesReady;
}
/**
* Returns the <code>MappedPositions</code> object that contains
* information about the primitive positions that have been computed
* for the given imagery layer.
*
* This assumes that <code>_computeMappedPositionsPerEllipsoid</code> has
* already been called.
*
* @param {ImageryLayer} imageryLayer The imageryLayer
* @returns {MappedPositions} The mapped positions
* @throws {DeveloperError} If the mapped positions for the
* ellipsoid could not be found.
*/
mappedPositionsForImageryLayer(imageryLayer) {
const ellipsoid = ModelPrimitiveImagery._getEllipsoid(imageryLayer);
return this.mappedPositionsForEllipsoid(ellipsoid);
}
/**
* Returns the <code>MappedPositions</code> object that contains
* information about the primitive positions that have been computed
* from the given ellipsoid.
*
* This assumes that <code>_computeMappedPositions</code> has
* already been called.
*
* @param {Ellipsoid} ellipsoid The ellipsoid
* @returns {MappedPositions} The mapped positions
* @throws {DeveloperError} If the mapped positions for the
* given ellipsoid could not be found.
*/
mappedPositionsForEllipsoid(ellipsoid) {
const mappedPositionsPerEllipsoid = this._mappedPositionsPerEllipsoid;
if (!defined(mappedPositionsPerEllipsoid)) {
throw new DeveloperError(
`The mappedPositions have not been computed yet`,
);
}
const length = mappedPositionsPerEllipsoid.length;
for (let i = 0; i < length; i++) {
const mappedPositions = mappedPositionsPerEllipsoid[i];
if (mappedPositions.ellipsoid === ellipsoid) {
return mappedPositions;
}
}
throw new DeveloperError(
`Could not find mapped positions for ellipsoid ${ellipsoid}`,
);
}
/**
* Returns the texture coordinate attributes for the primitive that
* are used for draping the imagery.
*
* This will be available when this object is <code>ready</code>, and
* will contain one attribute for each unique projection that appears
* in the imagery layers.
*
* @returns {ModelComponents.Attribute[]} The attributes
*/
imageryTexCoordAttributesPerProjection() {
const imageryTexCoordAttributesPerProjection =
this._imageryTexCoordAttributesPerProjection;
if (!defined(imageryTexCoordAttributesPerProjection)) {
throw new DeveloperError(
`The imagery texture coordinate attributes have not been computed yet`,
);
}
return this._imageryTexCoordAttributesPerProjection;
}
/**
* Returns whether the draping computations are "ready".
*
* This means that the <code>coveragesPerLayer</code> information
* has been computed, which describes the set of imagery tiles
* that are covered by the primitive, <b>and</b> that all the
* covered imagery tiles are in a state that counts as "ready"
* (i.e. <code>ImageryState.READY</code>, <code>FAILED</code>,
* or <code>INVALID</code>).
*
* @returns {boolean} Whether the draping computations are ready
*/
get ready() {
const coveragesPerLayer = this._coveragesPerLayer;
if (!defined(coveragesPerLayer)) {
return false;
}
return this._allImageriesReady;
}
/**
* Returns whether this object was destroyed.
*
* If this object was destroyed, calling any function other than
* <code>isDestroyed</code> will result in a {@link DeveloperError}.
*
* @returns {boolean} Whether this object was destroyed
*/
isDestroyed() {
return false;
}
/**
* Destroys this object and all its resources.
*/
destroy() {
if (this.isDestroyed()) {
return;
}
this._deleteCoveragesPerLayer();
this._destroyImageryTexCoordAttributes();
return destroyObject(this);
}
/**
* Compute the transform that apparently has to be applied to
* the positions attribute of a primitive, to compute the
* actual, final positions in ECEF coordinates.
*
* This is based on the computation of the bounding
* sphere that is done at the end of buildDrawCommands
*
* @param {Model} model The model
* @param {ModelComponents.Node} runtimeNode The runtime node
* that the primitive is attached to
* @param {Matrix4} [result] The result
* @returns {Matrix4} The result
* @private
*/
static _computePrimitivePositionTransform(model, runtimeNode, result) {
//>>includeStart('debug', pragmas.debug);
Check.defined("model", model);
Check.defined("runtimeNode", runtimeNode);
//>>includeEnd('debug');
Eif (!defined(result)) {
result = new Matrix4();
}
const modelSceneGraph = model.sceneGraph;
Matrix4.clone(Matrix4.IDENTITY, result);
Matrix4.multiply(result, model.modelMatrix, result);
Matrix4.multiply(result, modelSceneGraph.components.transform, result);
Matrix4.multiply(result, modelSceneGraph.axisCorrectionMatrix, result);
Matrix4.multiply(result, runtimeNode.computedTransform, result);
return result;
}
/**
* Returns the <code>"POSITION"</code> attribute from the given primitive.
*
* The <code>"POSITION"</code> attribute is required. If it is not
* defined for the given primitive, then a <code>DeveloperError</code>
* is thrown.
*
* @param {ModelComponents.Primitive} primitive The primitive
* @returns {ModelComponents.Attribute} The position attribute
* @throws {DeveloperError} If there is no position attribute
* @private
*/
static _obtainPrimitivePositionAttribute(primitive) {
//>>includeStart('debug', pragmas.debug);
Check.defined("primitive", primitive);
//>>includeEnd('debug');
const primitivePositionAttribute = ModelUtility.getAttributeBySemantic(
primitive,
"POSITION",
);
if (!defined(primitivePositionAttribute)) {
throw new DeveloperError(
"The primitive does not have a POSITION attribute",
);
}
return primitivePositionAttribute;
}
/**
* Returns the ellipsoid of the given imagery layer.
*
* This only exists to hide a train wreck
*
* @param {ImageryLayer} imageryLayer The imagery layer
* @returns {Ellipsoid} The ellipsoid
* @private
*/
static _getEllipsoid(imageryLayer) {
const ellipsoid =
imageryLayer.imageryProvider.tilingScheme.projection.ellipsoid;
return ellipsoid;
}
}
export default ModelPrimitiveImagery;
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