This is a josm plugin that replaces the default, Java2D map view with a version rendered using OpenGL.

See Releases

For this plugin, you need a special version of JOSM and of GLG2D. For the ease of compiling, GLG2D is just added to the plugin by a symbilic link, so you need Linux to compile this.

Check out those repositories in the same directory:

• https://github.com/michaelzangl/josm-plugin-opengl
• https://github.com/openstreetmap/josm (JOSM with changes for this plugin).
• https://github.com/michaelzangl/glg2d (Bug fixes for GLG2D)

Then run:

• ant josm/build.xml
• ant josm-plugin-opengl/build.xml

I use eclipse for developing. Simply add josm and josm-plugin-opengl as eclipse projects.

All classes have Javadocs. Those are the most important entry points to get started:

• OpenGLViewPlugin is the main entry point for the plugin.
• MapPanel is the OpenGL-replacement of the MapView
• LayerDrawManager does the layer drawing and replaces MapView#paint()
• StyleGenerationManager generates the styles and geometries for the current frame and - in a background thread - for future frames.
• StyleGeometryCache stores the geometries generated and handles invalidation.
• MergeGroup contains an explonation of the way geometries are stored.
• RecordingGraphics2D is our Graphics2D instance that records all draw calls and stores them for later use.
• the SimpeBuferPool pools our vertex buffers to avoid many allocate()-calls.