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import DeveloperError from "../Core/DeveloperError.js";
import Intersect from "../Core/Intersect.js";
import Cesium3DTileOptimizationHint from "./Cesium3DTileOptimizationHint.js";
import Cesium3DTileRefine from "./Cesium3DTileRefine.js";
/**
* Traverses a {@link Cesium3DTileset} to determine which tiles to load and render.
* This type describes an interface and is not intended to be instantiated directly.
*
* @alias Cesium3DTilesetTraversal
* @constructor
* @abstract
*
* @see Cesium3DTilesetBaseTraversal
* @see Cesium3DTilesetSkipTraversal
* @see Cesium3DTilesetMostDetailedTraversal
*
* @private
*/
function Cesium3DTilesetTraversal() {}
/**
* Traverses a {@link Cesium3DTileset} to determine which tiles to load and render.
*
* @private
* @param {Cesium3DTileset} tileset
* @param {FrameState} frameState
*/
Cesium3DTilesetTraversal.selectTiles = function (tileset, frameState) {
DeveloperError.throwInstantiationError();
};
/**
* Sort by farthest child first since this is going on a stack
*
* @private
* @param {Cesium3DTile} a
* @param {Cesium3DTile} b
* @returns {number}
*/
Cesium3DTilesetTraversal.sortChildrenByDistanceToCamera = function (a, b) {
if (b._distanceToCamera === 0 && a._distanceToCamera === 0) {
return b._centerZDepth - a._centerZDepth;
}
return b._distanceToCamera - a._distanceToCamera;
};
/**
* Determine if a tile can and should be traversed for children tiles that
* would contribute to rendering the current view
*
* @private
* @param {Cesium3DTile} tile
* @returns {boolean}
*/
Cesium3DTilesetTraversal.canTraverse = function (tile) {
if (tile.children.length === 0) {
return false;
}
if (tile.hasTilesetContent || tile.hasImplicitContent) {
// Traverse external tileset to visit its root tile
// Don't traverse if the subtree is expired because it will be destroyed
return !tile.contentExpired;
}
return tile._screenSpaceError > tile.tileset.memoryAdjustedScreenSpaceError;
};
/**
* Mark a tile as selected, and add it to the tileset's list of selected tiles
*
* @private
* @param {Cesium3DTile} tile
* @param {FrameState} frameState
*/
Cesium3DTilesetTraversal.selectTile = function (tile, frameState) {
if (tile.contentVisibility(frameState) === Intersect.OUTSIDE) {
return;
}
tile._wasSelectedLastFrame = true;
const { content, tileset } = tile;
if (content.featurePropertiesDirty) {
// A feature's property in this tile changed, the tile needs to be re-styled.
content.featurePropertiesDirty = false;
tile.lastStyleTime = 0; // Force applying the style to this tile
tileset._selectedTilesToStyle.push(tile);
} else if (tile._selectedFrame < frameState.frameNumber - 1) {
// Tile is newly selected; it is selected this frame, but was not selected last frame.
tileset._selectedTilesToStyle.push(tile);
tile._wasSelectedLastFrame = false;
}
tile._selectedFrame = frameState.frameNumber;
tileset._selectedTiles.push(tile);
};
/**
* @private
* @param {Cesium3DTile} tile
* @param {FrameState} frameState
*/
Cesium3DTilesetTraversal.visitTile = function (tile, frameState) {
++tile.tileset._statistics.visited;
tile._visitedFrame = frameState.frameNumber;
};
/**
* @private
* @param {Cesium3DTile} tile
* @param {FrameState} frameState
*/
Cesium3DTilesetTraversal.touchTile = function (tile, frameState) {
if (tile._touchedFrame === frameState.frameNumber) {
// Prevents another pass from touching the frame again
return;
}
tile.tileset._cache.touch(tile);
tile._touchedFrame = frameState.frameNumber;
};
/**
* Add a tile to the list of requested tiles, if appropriate
*
* @private
* @param {Cesium3DTile} tile
* @param {FrameState} frameState
*/
Cesium3DTilesetTraversal.loadTile = function (tile, frameState) {
const { tileset } = tile;
if (
tile._requestedFrame === frameState.frameNumber ||
(!tile.hasUnloadedRenderableContent && !tile.contentExpired)
) {
return;
}
if (!isOnScreenLongEnough(tile, frameState)) {
return;
}
const cameraHasNotStoppedMovingLongEnough =
frameState.camera.timeSinceMoved < tileset.foveatedTimeDelay;
if (tile.priorityDeferred && cameraHasNotStoppedMovingLongEnough) {
return;
}
tile._requestedFrame = frameState.frameNumber;
tileset._requestedTiles.push(tile);
};
/**
* Prevent unnecessary loads while camera is moving by getting the ratio of travel distance to tile size.
*
* @private
* @param {Cesium3DTile} tile
* @param {FrameState} frameState
* @returns {boolean}
*/
function isOnScreenLongEnough(tile, frameState) {
const { tileset } = tile;
if (!tileset._cullRequestsWhileMoving) {
return true;
}
const { positionWCDeltaMagnitude, positionWCDeltaMagnitudeLastFrame } =
frameState.camera;
const deltaMagnitude =
positionWCDeltaMagnitude !== 0.0
? positionWCDeltaMagnitude
: positionWCDeltaMagnitudeLastFrame;
// How do n frames of this movement compare to the tile's physical size.
const diameter = Math.max(tile.boundingSphere.radius * 2.0, 1.0);
const movementRatio =
(tileset.cullRequestsWhileMovingMultiplier * deltaMagnitude) / diameter;
return movementRatio < 1.0;
}
/**
* Reset some of the tile's flags and re-evaluate visibility and priority
*
* @private
* @param {Cesium3DTile} tile
* @param {FrameState} frameState
*/
Cesium3DTilesetTraversal.updateTile = function (tile, frameState) {
updateTileVisibility(tile, frameState);
tile.updateExpiration();
tile._wasMinPriorityChild = false;
tile._priorityHolder = tile;
updateMinimumMaximumPriority(tile);
// SkipLOD
tile._shouldSelect = false;
tile._finalResolution = true;
};
/**
* @private
* @param {Cesium3DTile} tile
* @param {FrameState} frameState
*/
function updateTileVisibility(tile, frameState) {
tile.updateVisibility(frameState);
if (!tile.isVisible) {
return;
}
const hasChildren = tile.children.length > 0;
if ((tile.hasTilesetContent || tile.hasImplicitContent) && hasChildren) {
// Use the root tile's visibility instead of this tile's visibility.
// The root tile may be culled by the children bounds optimization in which
// case this tile should also be culled.
const child = tile.children[0];
updateTileVisibility(child, frameState);
tile._visible = child._visible;
return;
}
if (meetsScreenSpaceErrorEarly(tile, frameState)) {
tile._visible = false;
return;
}
// Optimization - if none of the tile's children are visible then this tile isn't visible
const replace = tile.refine === Cesium3DTileRefine.REPLACE;
const useOptimization =
tile._optimChildrenWithinParent ===
Cesium3DTileOptimizationHint.USE_OPTIMIZATION;
if (replace && useOptimization && hasChildren) {
if (!anyChildrenVisible(tile, frameState)) {
++tile.tileset._statistics.numberOfTilesCulledWithChildrenUnion;
tile._visible = false;
return;
}
}
}
/**
* @private
* @param {Cesium3DTile} tile
* @param {FrameState} frameState
* @returns {boolean}
*/
function meetsScreenSpaceErrorEarly(tile, frameState) {
const { parent, tileset } = tile;
if (
!defined(parent) ||
parent.hasTilesetContent ||
parent.hasImplicitContent ||
parent.refine !== Cesium3DTileRefine.ADD
) {
return false;
}
// Use parent's geometric error with child's box to see if the tile already meet the SSE
return (
tile.getScreenSpaceError(frameState, true) <=
tileset.memoryAdjustedScreenSpaceError
);
}
/**
* @private
* @param {Cesium3DTile} tile
* @param {FrameState} frameState
* @returns {boolean}
*/
function anyChildrenVisible(tile, frameState) {
let anyVisible = false;
const children = tile.children;
for (let i = 0; i < children.length; ++i) {
const child = children[i];
child.updateVisibility(frameState);
anyVisible = anyVisible || child.isVisible;
}
return anyVisible;
}
/**
* @private
* @param {Cesium3DTile} tile
*/
function updateMinimumMaximumPriority(tile) {
const minimumPriority = tile.tileset._minimumPriority;
const maximumPriority = tile.tileset._maximumPriority;
const priorityHolder = tile._priorityHolder;
maximumPriority.distance = Math.max(
priorityHolder._distanceToCamera,
maximumPriority.distance,
);
minimumPriority.distance = Math.min(
priorityHolder._distanceToCamera,
minimumPriority.distance,
);
maximumPriority.depth = Math.max(tile._depth, maximumPriority.depth);
minimumPriority.depth = Math.min(tile._depth, minimumPriority.depth);
maximumPriority.foveatedFactor = Math.max(
priorityHolder._foveatedFactor,
maximumPriority.foveatedFactor,
);
minimumPriority.foveatedFactor = Math.min(
priorityHolder._foveatedFactor,
minimumPriority.foveatedFactor,
);
maximumPriority.reverseScreenSpaceError = Math.max(
tile._priorityReverseScreenSpaceError,
maximumPriority.reverseScreenSpaceError,
);
minimumPriority.reverseScreenSpaceError = Math.min(
tile._priorityReverseScreenSpaceError,
minimumPriority.reverseScreenSpaceError,
);
}
export default Cesium3DTilesetTraversal;
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