OpenSpace/modules/globebrowsing/tile/tileprovider/tileproviderbylevel.cpp

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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2017                                                               *
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#include <modules/globebrowsing/tile/tileprovider/tileproviderbylevel.h>
#include <modules/globebrowsing/rendering/layer/layergroupid.h>

#include <ghoul/misc/dictionary.h>
#include <ghoul/logging/logmanager.h>

namespace {
    const char* KeyProviders = "LevelTileProviders";
    const char* KeyMaxLevel = "MaxLevel";
    const char* KeyTileProvider = "TileProvider";
    const char* KeyLayerGroupID = "LayerGroupID";
}

namespace openspace {
namespace globebrowsing {
namespace tileprovider {

TileProviderByLevel::TileProviderByLevel(const ghoul::Dictionary& dictionary) {
    std::string name = "Name unspecified";
    dictionary.getValue("Name", name);
  
    layergroupid::ID layerGroupID;
    dictionary.getValue(KeyLayerGroupID, layerGroupID);
    const char* _loggerCat = ("TileProviderByLevel" + name).c_str();
  
    ghoul::Dictionary providers = dictionary.value<ghoul::Dictionary>(KeyProviders);

    for (size_t i = 0; i < providers.size(); i++) {
        try {
            std::string dictKey = std::to_string(i + 1);
            ghoul::Dictionary levelProviderDict = providers.value<ghoul::Dictionary>(
                dictKey
            );
            double floatMaxLevel;
            int maxLevel = 0;
            if (!levelProviderDict.getValue<double>(KeyMaxLevel, floatMaxLevel)) {
                throw std::runtime_error(
                    "Must define key '" + std::string(KeyMaxLevel) + "'"
                );
            }
            maxLevel = std::round(floatMaxLevel);
                
            ghoul::Dictionary providerDict;
            if (!levelProviderDict.getValue<ghoul::Dictionary>(KeyTileProvider, providerDict)) {
                throw std::runtime_error(
                    "Must define key '" + std::string(KeyTileProvider) + "'"
                );
            }
            providerDict.setValue(KeyLayerGroupID, layerGroupID);
                
            _levelTileProviders.push_back(
                std::shared_ptr<TileProvider>(TileProvider::createFromDictionary(providerDict))
            );
            
            // Ensure we can represent the max level
            if(static_cast<int>(_providerIndices.size()) < maxLevel){
                _providerIndices.resize(maxLevel+1, -1);
            }
                
            // map this level to the tile provider index
            _providerIndices[maxLevel] = _levelTileProviders.size() - 1;
        }
        catch (const ghoul::RuntimeError& e) {
            LWARNING("Unable to create tile provider: " + std::string(e.what()));
        }    
    }

    // If all failed
    if (_levelTileProviders.size() == 0) {
        throw ghoul::RuntimeError("Failed to create tile provider: " + name);
    }

    // Fill in the gaps (value -1) in provider indices, from back to end
    for(int i = _providerIndices.size() - 2; i >= 0; --i){
        if(_providerIndices[i] == -1){
            _providerIndices[i] = _providerIndices[i+1];
        }
    }
}

Tile TileProviderByLevel::getTile(const TileIndex& tileIndex) {
    return levelProvider(tileIndex.level)->getTile(tileIndex);
}

Tile::Status TileProviderByLevel::getTileStatus(const TileIndex& index) {
    return levelProvider(index.level)->getTileStatus(index);
}

TileDepthTransform TileProviderByLevel::depthTransform() {
    TileDepthTransform transform;
    transform.depthOffset = 0.0f;
    transform.depthScale = 1.0f;
    return transform;
}

void TileProviderByLevel::update() {
    for(auto provider : _levelTileProviders){
        provider->update();
    }
}

void TileProviderByLevel::reset() {
    for(auto provider : _levelTileProviders){
        provider->reset();
    }
}

int TileProviderByLevel::maxLevel() {
    return _providerIndices.size()-1;
}

int TileProviderByLevel::providerIndex(int level) const {
    int clampedLevel = std::max(
        0,
        std::min(level, static_cast<int>(_providerIndices.size()-1))
    );
    return _providerIndices[clampedLevel];
}

TileProvider* TileProviderByLevel::levelProvider(int level) const {
    return _levelTileProviders[providerIndex(level)].get();
}

} // namespace tileprovider
} // namespace globebrowsing
} // namespace openspace