Lazy init default tiles. Make TemporalTileProviders only use one default tile

modules/globebrowsing/tile/temporaltileprovider.cpp

@@ -64,6 +64,7 @@ namespace openspace {
         // read file
         std::string xml( (std::istreambuf_iterator<char>(in)), (std::istreambuf_iterator<char>()));
         _gdalXmlTemplate = consumeTemporalMetaData(xml);
+        _defaultTile = getTileProvider()->getDefaultTile();
     }
 
     std::string TemporalTileProvider::consumeTemporalMetaData(const std::string& xml) {
@@ -124,8 +125,7 @@ namespace openspace {
     }
 
     Tile TemporalTileProvider::getDefaultTile() {
-        ensureUpdated();
-        return _currentTileProvider->getDefaultTile();
+        return _defaultTile;
     }
 
 

modules/globebrowsing/tile/temporaltileprovider.h

@@ -161,6 +161,8 @@ namespace openspace {
         std::unordered_map<TimeKey, std::shared_ptr<TileProvider> > _tileProviderMap;
         TileProviderInitData _tileProviderInitData;
 
+        Tile _defaultTile;
+
         std::shared_ptr<TileProvider> _currentTileProvider;
 
         TimeFormat * _timeFormat;

modules/globebrowsing/tile/tileprovider.cpp

@@ -104,7 +104,7 @@ namespace openspace {
         , _framesUntilRequestFlush(framesUntilFlushRequestQueue)
         , _framesSinceLastRequestFlush(0)
     {
-        _defaultTile = createTile(_asyncTextureDataProvider->getTextureDataProvider()->defaultTileData());
+        
     }
 
 
@@ -146,6 +146,9 @@ namespace openspace {
     }
 
     Tile CachingTileProvider::getDefaultTile() {
+        if (_defaultTile.texture == nullptr) {
+            _defaultTile = createTile(_asyncTextureDataProvider->getTextureDataProvider()->defaultTileData());
+        }
         return _defaultTile;
     }