573 lines
19 KiB
C
573 lines
19 KiB
C
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#pragma once
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#include "Library.h"
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#include "RasterOverlayCollection.h"
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#include "SampleHeightResult.h"
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#include "Tile.h"
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#include "TilesetContentLoader.h"
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#include "TilesetExternals.h"
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#include "TilesetLoadFailureDetails.h"
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#include "TilesetOptions.h"
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#include "ViewState.h"
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#include "ViewUpdateResult.h"
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#include <CesiumAsync/AsyncSystem.h>
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#include <CesiumUtility/IntrusivePointer.h>
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#include <rapidjson/fwd.h>
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#include <list>
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#include <memory>
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#include <optional>
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#include <string>
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#include <vector>
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namespace Cesium3DTilesSelection {
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class TilesetContentManager;
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class TilesetMetadata;
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class TilesetHeightQuery;
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struct TilesetHeightRequest;
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class TilesetSharedAssetSystem;
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/**
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* @brief A <a
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* href="https://github.com/CesiumGS/3d-tiles/tree/master/specification">3D
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* Tiles tileset</a>, used for streaming massive heterogeneous 3D geospatial
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* datasets.
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*/
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class CESIUM3DTILESSELECTION_API Tileset final {
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public:
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/**
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* @brief Constructs a new instance with a given custom tileset loader.
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* @param externals The external interfaces to use.
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* @param pCustomLoader The custom loader used to load the tileset and tile
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* content.
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* @param pRootTile The root tile that is associated with the custom loader
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* @param options Additional options for the tileset.
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*/
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Tileset(
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const TilesetExternals& externals,
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std::unique_ptr<TilesetContentLoader>&& pCustomLoader,
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std::unique_ptr<Tile>&& pRootTile,
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const TilesetOptions& options = TilesetOptions());
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/**
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* @brief Constructs a new instance with a given `tileset.json` URL.
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* @param externals The external interfaces to use.
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* @param url The URL of the `tileset.json`.
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* @param options Additional options for the tileset.
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*/
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Tileset(
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const TilesetExternals& externals,
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const std::string& url,
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const TilesetOptions& options = TilesetOptions());
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/**
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* @brief Constructs a new instance with the given asset ID on <a
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* href="https://cesium.com/ion/">Cesium ion</a>.
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* @param externals The external interfaces to use.
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* @param ionAssetID The ID of the Cesium ion asset to use.
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* @param ionAccessToken The Cesium ion access token authorizing access to the
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* asset.
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* @param options Additional options for the tileset.
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* @param ionAssetEndpointUrl The URL of the ion asset endpoint. Defaults
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* to Cesium ion but a custom endpoint can be specified.
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*/
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Tileset(
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const TilesetExternals& externals,
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int64_t ionAssetID,
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const std::string& ionAccessToken,
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const TilesetOptions& options = TilesetOptions(),
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const std::string& ionAssetEndpointUrl = "https://api.cesium.com/");
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/**
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* @brief Destroys this tileset.
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*
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* Destroying the tileset will immediately (before the destructor returns)
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* unload as much tile content as possible. However, tiles that are currently
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* in the process of being loaded cannot be unloaded immediately. These tiles
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* will be unloaded asynchronously some time after this destructor returns. To
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* be notified of completion of the async portion of the tileset destruction,
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* subscribe to {@link getAsyncDestructionCompleteEvent}.
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*/
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~Tileset() noexcept;
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/**
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* @brief A future that resolves when this Tileset has been destroyed (i.e.
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* its destructor has been called) and all async operations that it was
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* executing have completed.
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*/
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CesiumAsync::SharedFuture<void>& getAsyncDestructionCompleteEvent();
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/**
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* @brief A future that resolves when the details of the root tile of this
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* tileset are available. The root tile's content (e.g., 3D model), however,
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* will not necessarily be loaded yet.
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*/
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CesiumAsync::SharedFuture<void>& getRootTileAvailableEvent();
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/**
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* @brief Get tileset credits.
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*/
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const std::vector<CesiumUtility::Credit>& getTilesetCredits() const noexcept;
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/**
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* @brief Sets whether or not the tileset's credits should be shown on screen.
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* @param showCreditsOnScreen Whether the credits should be shown on screen.
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*/
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void setShowCreditsOnScreen(bool showCreditsOnScreen) noexcept;
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/**
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* @brief Gets the {@link TilesetExternals} that summarize the external
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* interfaces used by this tileset.
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*/
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TilesetExternals& getExternals() noexcept { return this->_externals; }
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/**
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* @brief Gets the {@link TilesetExternals} that summarize the external
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* interfaces used by this tileset.
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*/
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const TilesetExternals& getExternals() const noexcept {
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return this->_externals;
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}
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/**
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* @brief Returns the {@link CesiumAsync::AsyncSystem} that is used for
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* dispatching asynchronous tasks.
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*/
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CesiumAsync::AsyncSystem& getAsyncSystem() noexcept {
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return this->_asyncSystem;
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}
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/** @copydoc Tileset::getAsyncSystem() */
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const CesiumAsync::AsyncSystem& getAsyncSystem() const noexcept {
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return this->_asyncSystem;
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}
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/** @copydoc Tileset::getOptions() */
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const TilesetOptions& getOptions() const noexcept { return this->_options; }
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/**
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* @brief Gets the {@link TilesetOptions} of this tileset.
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*/
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TilesetOptions& getOptions() noexcept { return this->_options; }
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/**
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* @brief Gets the {@link CesiumGeospatial::Ellipsoid} used by this tileset.
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*/
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const CesiumGeospatial::Ellipsoid& getEllipsoid() const {
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return this->_options.ellipsoid;
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}
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/** @copydoc Tileset::getEllipsoid */
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CesiumGeospatial::Ellipsoid& getEllipsoid() noexcept {
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return this->_options.ellipsoid;
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}
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/**
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* @brief Gets the root tile of this tileset.
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*
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* This may be `nullptr` if there is currently no root tile.
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*/
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Tile* getRootTile() noexcept;
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/** @copydoc Tileset::getRootTile() */
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const Tile* getRootTile() const noexcept;
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/**
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* @brief Returns the {@link RasterOverlayCollection} of this tileset.
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*/
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RasterOverlayCollection& getOverlays() noexcept;
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/** @copydoc Tileset::getOverlays() */
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const RasterOverlayCollection& getOverlays() const noexcept;
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/**
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* @brief Returns the {@link TilesetSharedAssetSystem} of this tileset.
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*/
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TilesetSharedAssetSystem& getSharedAssetSystem() noexcept;
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/** @copydoc Tileset::getSharedAssetSystem() */
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const TilesetSharedAssetSystem& getSharedAssetSystem() const noexcept;
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/**
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* @brief Updates this view but waits for all tiles that meet sse to finish
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* loading and ready to be rendered before returning the function. This method
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* is significantly slower than {@link Tileset::updateView} and should only be
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* used for capturing movie or non-realtime situation.
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* @param frustums The {@link ViewState}s that the view should be updated for
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* @returns The set of tiles to render in the updated view. This value is only
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* valid until the next call to `updateView` or until the tileset is
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* destroyed, whichever comes first.
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*/
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const ViewUpdateResult&
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updateViewOffline(const std::vector<ViewState>& frustums);
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/**
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* @brief Updates this view, returning the set of tiles to render in this
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* view.
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* @param frustums The {@link ViewState}s that the view should be updated for
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* @param deltaTime The amount of time that has passed since the last call to
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* updateView, in seconds.
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* @returns The set of tiles to render in the updated view. This value is only
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* valid until the next call to `updateView` or until the tileset is
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* destroyed, whichever comes first.
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*/
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const ViewUpdateResult&
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updateView(const std::vector<ViewState>& frustums, float deltaTime = 0.0f);
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/**
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* @brief Gets the total number of tiles that are currently loaded.
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*/
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int32_t getNumberOfTilesLoaded() const;
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/**
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* @brief Estimate the percentage of the tiles for the current view that have
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* been loaded.
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*/
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float computeLoadProgress() noexcept;
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/**
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* @brief Invokes a function for each tile that is currently loaded.
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*
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* @param callback The function to invoke.
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*/
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void forEachLoadedTile(const std::function<void(Tile& tile)>& callback);
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/**
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* @brief Invokes a function for each tile that is currently loaded.
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*
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* @param callback The function to invoke.
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*/
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void forEachLoadedTile(
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const std::function<void(const Tile& tile)>& callback) const;
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/**
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* @brief Gets the total number of bytes of tile and raster overlay data that
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* are currently loaded.
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*/
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int64_t getTotalDataBytes() const noexcept;
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/**
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* @brief Gets the {@link TilesetMetadata} associated with the main or
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* external tileset.json that contains a given tile. If the metadata is not
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* yet loaded, this method returns nullptr.
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*
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* If this tileset's root tile is not yet available, this method returns
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* nullptr.
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*
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* If the tileset has a {@link TilesetMetadata::schemaUri}, it will not
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* necessarily have been loaded yet.
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*
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* If the provided tile is not the root tile of a tileset.json, this method
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* walks up the {@link Tile::getParent} chain until it finds the closest
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* root and then returns the metadata associated with the corresponding
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* tileset.json.
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*
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* Consider calling {@link loadMetadata} instead, which will return a future
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* that only resolves after the root tile is loaded and the `schemaUri`, if
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* any, has been resolved.
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*
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* @param pTile The tile. If this parameter is nullptr, the metadata for the
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* main tileset.json is returned.
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* @return The found metadata, or nullptr if the root tile is not yet loaded.
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*/
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const TilesetMetadata* getMetadata(const Tile* pTile = nullptr) const;
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/**
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* @brief Asynchronously loads the metadata associated with the main
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* tileset.json.
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*
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* Before the returned future resolves, the root tile of this tileset will be
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* loaded and the {@link TilesetMetadata::schemaUri} will be loaded if one
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* has been specified.
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*
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* If the tileset or `schemaUri` fail to load, the returned future will
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* reject.
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*
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* @return A shared future that resolves to the loaded metadata. Once this
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* future resolves, {@link getMetadata} can be used to synchronously obtain
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* the same metadata instance.
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*/
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CesiumAsync::Future<const TilesetMetadata*> loadMetadata();
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/**
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* @brief Initiates an asynchronous query for the height of this tileset at a
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* list of cartographic positions (longitude and latitude). The most detailed
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* available tiles are used to determine each height.
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*
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* The height of the input positions is ignored. The output height is
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* expressed in meters above the ellipsoid (usually WGS84), which should not
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* be confused with a height above mean sea level.
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*
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* Note that {@link Tileset::updateView} must be called periodically, or else
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* the returned `Future` will never resolve. If you are not using this tileset
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* for visualization, you can call `updateView` with an empty list of
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* frustums.
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*
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* @param positions The positions for which to sample heights.
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* @return A future that asynchronously resolves to the result of the height
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* query.
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*/
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CesiumAsync::Future<SampleHeightResult> sampleHeightMostDetailed(
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const std::vector<CesiumGeospatial::Cartographic>& positions);
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private:
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/**
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* @brief The result of traversing one branch of the tile hierarchy.
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*
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* Instances of this structure are created by the `_visit...` functions,
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* and summarize the information that was gathered during the traversal
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* of the respective branch, so that this information can be used by
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* the parent to decide on the further traversal process.
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*/
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struct TraversalDetails {
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/**
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* @brief Whether all selected tiles in this tile's subtree are renderable.
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*
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* This is `true` if all selected (i.e. not culled or refined) tiles in this
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* tile's subtree are renderable. If the subtree is renderable, we'll render
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* it; no drama.
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*/
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bool allAreRenderable = true;
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/**
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* @brief Whether any tile in this tile's subtree was rendered in the last
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* frame.
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*
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* This is `true` if any tiles in this tile's subtree were rendered last
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* frame. If any were, we must render the subtree rather than this tile,
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* because rendering this tile would cause detail to vanish that was visible
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* last frame, and that's no good.
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*/
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bool anyWereRenderedLastFrame = false;
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/**
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* @brief The number of selected tiles in this tile's subtree that are not
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* yet renderable.
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*
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* Counts the number of selected tiles in this tile's subtree that are
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* not yet ready to be rendered because they need more loading. Note that
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* this value will _not_ necessarily be zero when
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* `allAreRenderable` is `true`, for subtle reasons.
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* When `allAreRenderable` and `anyWereRenderedLastFrame` are both `false`,
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* we will render this tile instead of any tiles in its subtree and the
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* `allAreRenderable` value for this tile will reflect only whether _this_
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* tile is renderable. The `notYetRenderableCount` value, however, will
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* still reflect the total number of tiles that we are waiting on, including
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* the ones that we're not rendering. `notYetRenderableCount` is only reset
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* when a subtree is removed from the render queue because the
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* `notYetRenderableCount` exceeds the
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* {@link TilesetOptions::loadingDescendantLimit}.
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*/
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uint32_t notYetRenderableCount = 0;
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};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Input information that is constant throughout the traversal.
|
||
|
|
*
|
||
|
|
* An instance of this structure is created upon entry of the top-level
|
||
|
|
* `_visitTile` function, for the traversal for a certain frame, and
|
||
|
|
* passed on through the traversal.
|
||
|
|
*/
|
||
|
|
struct FrameState {
|
||
|
|
const std::vector<ViewState>& frustums;
|
||
|
|
std::vector<double> fogDensities;
|
||
|
|
int32_t lastFrameNumber;
|
||
|
|
int32_t currentFrameNumber;
|
||
|
|
};
|
||
|
|
|
||
|
|
TraversalDetails _renderLeaf(
|
||
|
|
const FrameState& frameState,
|
||
|
|
Tile& tile,
|
||
|
|
double tilePriority,
|
||
|
|
ViewUpdateResult& result);
|
||
|
|
TraversalDetails _renderInnerTile(
|
||
|
|
const FrameState& frameState,
|
||
|
|
Tile& tile,
|
||
|
|
ViewUpdateResult& result);
|
||
|
|
bool _kickDescendantsAndRenderTile(
|
||
|
|
const FrameState& frameState,
|
||
|
|
Tile& tile,
|
||
|
|
ViewUpdateResult& result,
|
||
|
|
TraversalDetails& traversalDetails,
|
||
|
|
size_t firstRenderedDescendantIndex,
|
||
|
|
size_t workerThreadLoadQueueIndex,
|
||
|
|
size_t mainThreadLoadQueueIndex,
|
||
|
|
bool queuedForLoad,
|
||
|
|
double tilePriority);
|
||
|
|
TileOcclusionState
|
||
|
|
_checkOcclusion(const Tile& tile, const FrameState& frameState);
|
||
|
|
|
||
|
|
TraversalDetails _visitTile(
|
||
|
|
const FrameState& frameState,
|
||
|
|
uint32_t depth,
|
||
|
|
bool meetsSse,
|
||
|
|
bool ancestorMeetsSse,
|
||
|
|
Tile& tile,
|
||
|
|
double tilePriority,
|
||
|
|
ViewUpdateResult& result);
|
||
|
|
|
||
|
|
struct CullResult {
|
||
|
|
// whether we should visit this tile
|
||
|
|
bool shouldVisit = true;
|
||
|
|
// whether this tile was culled (Note: we might still want to visit it)
|
||
|
|
bool culled = false;
|
||
|
|
};
|
||
|
|
|
||
|
|
// TODO: abstract these into a composable culling interface.
|
||
|
|
void _frustumCull(
|
||
|
|
const Tile& tile,
|
||
|
|
const FrameState& frameState,
|
||
|
|
bool cullWithChildrenBounds,
|
||
|
|
CullResult& cullResult);
|
||
|
|
void _fogCull(
|
||
|
|
const FrameState& frameState,
|
||
|
|
const std::vector<double>& distances,
|
||
|
|
CullResult& cullResult);
|
||
|
|
bool _meetsSse(
|
||
|
|
const std::vector<ViewState>& frustums,
|
||
|
|
const Tile& tile,
|
||
|
|
const std::vector<double>& distances,
|
||
|
|
bool culled) const noexcept;
|
||
|
|
|
||
|
|
TraversalDetails _visitTileIfNeeded(
|
||
|
|
const FrameState& frameState,
|
||
|
|
uint32_t depth,
|
||
|
|
bool ancestorMeetsSse,
|
||
|
|
Tile& tile,
|
||
|
|
ViewUpdateResult& result);
|
||
|
|
TraversalDetails _visitVisibleChildrenNearToFar(
|
||
|
|
const FrameState& frameState,
|
||
|
|
uint32_t depth,
|
||
|
|
bool ancestorMeetsSse,
|
||
|
|
Tile& tile,
|
||
|
|
ViewUpdateResult& result);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief When called on an additive-refined tile, queues it for load and adds
|
||
|
|
* it to the render list.
|
||
|
|
*
|
||
|
|
* For replacement-refined tiles, this method does nothing and returns false.
|
||
|
|
*
|
||
|
|
* @param tile The tile to potentially load and render.
|
||
|
|
* @param result The current view update result.
|
||
|
|
* @param tilePriority The load priority of this tile.
|
||
|
|
* priority.
|
||
|
|
* @param queuedForLoad True if this tile has already been queued for loading.
|
||
|
|
* @return true The additive-refined tile was queued for load and added to the
|
||
|
|
* render list.
|
||
|
|
* @return false The non-additive-refined tile was ignored.
|
||
|
|
*/
|
||
|
|
bool _loadAndRenderAdditiveRefinedTile(
|
||
|
|
Tile& tile,
|
||
|
|
ViewUpdateResult& result,
|
||
|
|
double tilePriority,
|
||
|
|
bool queuedForLoad);
|
||
|
|
|
||
|
|
void _processWorkerThreadLoadQueue();
|
||
|
|
void _processMainThreadLoadQueue();
|
||
|
|
|
||
|
|
void _unloadCachedTiles(double timeBudget) noexcept;
|
||
|
|
void _markTileVisited(Tile& tile) noexcept;
|
||
|
|
|
||
|
|
void _updateLodTransitions(
|
||
|
|
const FrameState& frameState,
|
||
|
|
float deltaTime,
|
||
|
|
ViewUpdateResult& result) const noexcept;
|
||
|
|
|
||
|
|
TilesetExternals _externals;
|
||
|
|
CesiumAsync::AsyncSystem _asyncSystem;
|
||
|
|
|
||
|
|
TilesetOptions _options;
|
||
|
|
|
||
|
|
int32_t _previousFrameNumber;
|
||
|
|
ViewUpdateResult _updateResult;
|
||
|
|
|
||
|
|
enum class TileLoadPriorityGroup {
|
||
|
|
/**
|
||
|
|
* @brief Low priority tiles that aren't needed right now, but
|
||
|
|
* are being preloaded for the future.
|
||
|
|
*/
|
||
|
|
Preload = 0,
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Medium priority tiles that are needed to render the current view
|
||
|
|
* the appropriate level-of-detail.
|
||
|
|
*/
|
||
|
|
Normal = 1,
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief High priority tiles that are causing extra detail to be rendered
|
||
|
|
* in the scene, potentially creating a performance problem and aliasing
|
||
|
|
* artifacts.
|
||
|
|
*/
|
||
|
|
Urgent = 2
|
||
|
|
};
|
||
|
|
|
||
|
|
struct TileLoadTask {
|
||
|
|
/**
|
||
|
|
* @brief The tile to be loaded.
|
||
|
|
*/
|
||
|
|
Tile* pTile;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief The priority group (low / medium / high) in which to load this
|
||
|
|
* tile.
|
||
|
|
*
|
||
|
|
* All tiles in a higher priority group are given a chance to load before
|
||
|
|
* any tiles in a lower priority group.
|
||
|
|
*/
|
||
|
|
TileLoadPriorityGroup group;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief The priority of this tile within its priority group.
|
||
|
|
*
|
||
|
|
* Tiles with a _lower_ value for this property load sooner!
|
||
|
|
*/
|
||
|
|
double priority;
|
||
|
|
|
||
|
|
bool operator<(const TileLoadTask& rhs) const noexcept {
|
||
|
|
if (this->group == rhs.group)
|
||
|
|
return this->priority < rhs.priority;
|
||
|
|
else
|
||
|
|
return this->group > rhs.group;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
std::vector<TileLoadTask> _mainThreadLoadQueue;
|
||
|
|
std::vector<TileLoadTask> _workerThreadLoadQueue;
|
||
|
|
std::vector<Tile*> _heightQueryLoadQueue;
|
||
|
|
|
||
|
|
Tile::LoadedLinkedList _loadedTiles;
|
||
|
|
|
||
|
|
// Holds computed distances, to avoid allocating them on the heap during tile
|
||
|
|
// selection.
|
||
|
|
std::vector<double> _distances;
|
||
|
|
|
||
|
|
// Holds the occlusion proxies of the children of a tile. Store them in this
|
||
|
|
// scratch variable so that it can allocate only when growing bigger.
|
||
|
|
std::vector<const TileOcclusionRendererProxy*> _childOcclusionProxies;
|
||
|
|
|
||
|
|
CesiumUtility::IntrusivePointer<TilesetContentManager>
|
||
|
|
_pTilesetContentManager;
|
||
|
|
|
||
|
|
std::list<TilesetHeightRequest> _heightRequests;
|
||
|
|
|
||
|
|
void addTileToLoadQueue(
|
||
|
|
Tile& tile,
|
||
|
|
TileLoadPriorityGroup priorityGroup,
|
||
|
|
double priority);
|
||
|
|
|
||
|
|
static TraversalDetails createTraversalDetailsForSingleTile(
|
||
|
|
const FrameState& frameState,
|
||
|
|
const Tile& tile,
|
||
|
|
const TileSelectionState& lastFrameSelectionState);
|
||
|
|
|
||
|
|
Tileset(const Tileset& rhs) = delete;
|
||
|
|
Tileset& operator=(const Tileset& rhs) = delete;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace Cesium3DTilesSelection
|