1a6bf3c284
Previously, reading LINE_FEATURE_LIST/AREA_FEATURE_LIST/COASTLINE_LIST
files were not read with the .stg file, but deferred into the
DelayLoadReadFileCallback. When the the Callback was executed, the
files were read and appropriate terrain tiles dirtied for regeneration.
However, re-generating dirtied tiles caused significant frame pauses
and was disabled in commit
deb802f74a
This meant that the Line/Area/Coastline features would only be rendered
when the next LoD tile was generated. Which created a race condition
on startup for the tile the user starts on, between the
DelayLoadReadFileCallback and the tile itself.
This commit reads these files at the same time as the initial terrain
so that the VPB has all the data required when the tile is initially
rendered. The downside is that line data is read for every tile,
even if it is far away. As the line data is stored as a series of
lat/lon floats, this is assumed to be OK.
An alternative would be to re-instate the Visitor, and instead
of dirtying existing terrain, generate the roads, and flag them to
the UpdateVisitor to add to the terrain node.
SimGear - Simulator Construction Tools ====================================== http://www.flightgear.org SimGear is a set of open-source libraries designed to be used as building blocks for quickly assembling 3d simulations, games, and visualization applications. SimGear is developed by the FlightGear project and also provides the base for the FlightGear Flight Simulator. Source code for SimGear is released under the GNU Library General Public License (LGPL) - see COPYING for license details. See INSTALL file for help on building SimGear.