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This is a performance improvement that reduces the amount of frame pauses which are related to mipmap creation when the geometry (osg::Texture) is added to the scene graph within osg::Texture::applyTexImage2D_load The texture cache is configured from FG as follows - /sim/rendering/texture-cache/cache-enabled - /sim/rendering/texture-cache/compress-transparent - /sim/rendering/texture-cache/compress-solid - /sim/rendering/texture-cache/compress These properties are set via the SGSceneFeatures singleton. When the texture cache is enabled it will auto convert files from any supported osg::Image format that can be read and store the resulting (compressed or raw) file in the texture cache. The texture cache uses osg_nvtt to perform texture compression (and mipmap generation) if available. When not available simgear::effect::computeMipmap is used to make mimaps but compression isn't available. The texture cache filename ends with .TIME.cache.dds where TIME is the hex modtime of the original file. As yet there isn't a clean way to maintain the texture cache to ensure that stale files are removed; and in fact this is quite difficult to do because of the dynamic nature of the cache. The texture cache will be stored in download_dir/texture-cache unless --texture-cache is passed on the command line. The UI has a single checkbox to turn the texture cache on or off.
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.