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josm-plugin-opengl

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

Installing

See Releases

Compiling

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:

Then run:

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

Developing

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.