755 lines
21 KiB
Text
755 lines
21 KiB
Text
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########################################################
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# compatibility layer for local weather package
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# Thorsten Renk, March 2011
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########################################################
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# function purpose
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#
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# setDefaultCloudsOff to remove the standard Flightgear 3d clouds
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# setVisibility to set the visibility to a given value
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# setLift to set lift to given value
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# setRain to set rain to a given value
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# setSnow to set snow to a given value
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# setTurbulence to set turbulence to a given value
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# setTemperature to set temperature to a given value
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# setPressure to set pressure to a given value
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# setDewpoint to set the dewpoint to a given value
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# setLight to set light saturation to given value
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# setWind to set wind
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# setWindSmoothly to set the wind gradually across a second
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# smooth_wind_loop (helper function for setWindSmoothly)
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# create_cloud to place a single cloud into the scenery
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# create_cloud_array to place clouds from storage arrays into the scenery
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# get_elevation to get the terrain elevation at given coordinates
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# get_elevation_vector to get terrain elevation at given coordinate vector
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# This file contains portability wrappers for the local weather system:
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# http://wiki.flightgear.org/index.php/A_local_weather_system
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#
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# This module is intended to provide a certain degree of backward compatibility for past
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# FlightGear releases, while sketching out the low level APIs used and required by the
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# local weather system, as these
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# are being added to FlightGear.
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#
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# This file contains various workarounds for doing things that are currently not yet directly
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# supported by the core FlightGear/Nasal APIs (fgfs 2.0).
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#
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# Some of these workarounds are purely implemented in Nasal space, and may thus not provide sufficient
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# performance in some situations.
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#
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# The goal is to move all such workarounds eventually into this module, so that the high level weather modules
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# only refer to this "compatibility layer" (using an "ideal API"), while this module handles
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# implementation details
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# and differences among different versions of FlightGear, so that key APIs can be ported to C++ space
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# for the sake
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# of improving runtime performance and efficiency.
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#
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# This provides an abstraction layer that isolates the rest of the local weather system from low
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# level implementation details.
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#
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# C++ developers who want to help improve the local weather system (or the FlightGear/Nasal
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# interface in general) should
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# check out this file (as well as the wiki page) for APIs or features that shall eventually be
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# re/implemented in C++ space for
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# improving the local weather system.
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#
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#
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# This module provides a handful of helpers for dynamically querying the Nasal API of the running fgfs binary,
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# so that it can make use of new APIs (where available), while still working with older fgfs versions.
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#
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# Note: The point of these helpers is that they should really only be used
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# by this module, and not in other parts/files of the
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# local weather system. Any hard coded special cases should be moved into this module.
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#
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# The compatibility layer is currently work in progress and will be extended as new Nasal
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# APIs are being added to FlightGear.
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var weather_dynamics = nil;
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var weather_tile_management = nil;
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var compat_layer = nil;
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var weather_tiles = nil;
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_setlistener("/nasal/local_weather/loaded", func {
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compat_layer = local_weather;
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weather_dynamics = local_weather;
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weather_tile_management = local_weather;
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weather_tiles = local_weather;
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var result = "yes";
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print("Compatibility layer: testing for hard coded support");
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if (props.globals.getNode("/rendering/scene/saturation", 0) == nil)
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{result = "no"; features.can_set_light = 0;}
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else
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{result = "yes"; features.can_set_light = 1;}
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print("* can set light saturation: "~result);
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if (props.globals.getNode("/rendering/scene/scattering", 0) == nil)
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{result = "no"; features.can_set_scattering = 0;}
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else
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{result = "yes"; features.can_set_scattering = 1;}
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print("* can set horizon scattering: "~result);
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if (props.globals.getNode("/environment/terrain", 0) == nil)
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{result = "no"; features.terrain_presampling = 0;}
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else
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{result = "yes"; features.terrain_presampling = 1;setprop("/environment/terrain/area[0]/enabled",1);}
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print("* hard coded terrain presampling: "~result);
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if ((props.globals.getNode("/environment/terrain/area[0]/enabled",1).getBoolValue() == 1) and (features.terrain_presampling ==1))
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{result = "yes"; features.terrain_presampling_active = 1;}
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else
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{result = "no"; features.terrain_presampling_active = 0;}
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print("* terrain presampling initialized: "~result);
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if (props.globals.getNode("/environment/config/enabled", 0) == nil)
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{result = "no"; features.can_disable_environment = 0;}
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else
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{result = "yes"; features.can_disable_environment = 1;}
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print("* can disable global weather: "~result);
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print("Compatibility layer: tests done.");
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});
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var setDefaultCloudsOff = func {
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if (features.can_disable_environment == 1)
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{
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var layers = props.globals.getNode("/environment/clouds").getChildren("layer");
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foreach (l; layers)
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{
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l.getNode("coverage-type").setValue(5);
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}
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}
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else
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{
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var layers = props.globals.getNode("/environment/clouds").getChildren("layer");
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foreach (l; layers)
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{
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l.getNode("coverage").setValue("clear");
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}
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}
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}
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####################################
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# set visibility to given value
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####################################
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var setVisibility = func (vis) {
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if (features.can_disable_environment == 1)
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{
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setprop("/environment/visibility-m",vis);
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}
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else
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{
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# this is a workaround for systems which lack hard-coded support
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# essentially we update all entries in config and reinit environment
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var entries_aloft = props.globals.getNode("environment/config/aloft", 1).getChildren("entry");
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foreach (var e; entries_aloft) {
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e.getNode("visibility-m",1).setValue(vis);
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}
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var entries_boundary = props.globals.getNode("environment/config/boundary", 1).getChildren("entry");
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foreach (var e; entries_boundary) {
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e.getNode("visibility-m",1).setValue(vis);
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}
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fgcommand("reinit", props.Node.new({subsystem:"environment"}));
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}
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}
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####################################
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# set thermal lift to given value
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####################################
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var setLift = func (lift) {
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if (features.can_disable_environment == 1)
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{
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setprop("/environment/wind-from-down-fps",lift);
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}
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}
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####################################
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# set rain to given value
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####################################
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var setRain = func (rain) {
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if (features.can_disable_environment == 1)
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{
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setprop("/environment/rain-norm", rain);
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}
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else
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{
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# setting the lowest cloud layer to 30.000 ft is a workaround
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# as rain is only created below that layer in default
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setprop("/environment/clouds/layer[0]/elevation-ft", 30000.0);
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setprop("/environment/metar/rain-norm",rain);
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}
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}
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####################################
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# set snow to given value
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####################################
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var setSnow = func (snow) {
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if (features.can_disable_environment == 1)
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{
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setprop("/environment/snow-norm", snow);
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}
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else
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{
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# setting the lowest cloud layer to 30.000 ft is a workaround
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# as snow is only created below that layer in default
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setprop("environment/clouds/layer[0]/elevation-ft", 30000.0);
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setprop("environment/metar/snow-norm",snow);
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}
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}
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####################################
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# set turbulence to given value
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####################################
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var setTurbulence = func (turbulence) {
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if (features.can_disable_environment == 1)
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{
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setprop("/environment/turbulence/magnitude-norm",turbulence);
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setprop("/environment/turbulence/rate-hz",3.0);
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}
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else
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{
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# this is a workaround for systems which lack hard-coded support
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# essentially we update all entries in config and reinit environment
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var entries_aloft = props.globals.getNode("environment/config/aloft", 1).getChildren("entry");
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foreach (var e; entries_aloft) {
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e.getNode("turbulence/magnitude-norm",1).setValue(turbulence);
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e.getNode("turbulence/rate-hz",1).setValue(3.0);
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e.getNode("turbulence/factor",1).setValue(1.0);
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}
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# turbulence is slightly reduced in boundary layers
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var entries_boundary = props.globals.getNode("environment/config/boundary", 1).getChildren("entry");
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var i = 1;
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foreach (var e; entries_boundary) {
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e.getNode("turbulence/magnitude-norm",1).setValue(turbulence * 0.25*i);
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e.getNode("turbulence/rate-hz",1).setValue(5.0);
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e.getNode("turbulence/factor",1).setValue(1.0);
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i = i + 1;
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}
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fgcommand("reinit", props.Node.new({subsystem:"environment"}));
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}
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}
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####################################
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# set temperature to given value
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####################################
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var setTemperature = func (T) {
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if (features.can_disable_environment == 1)
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{
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setprop("/environment/temperature-sea-level-degc",T);
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}
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else
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{
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# this is a workaround for systems which lack hard-coded support
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# essentially we update the entry in config and reinit environment
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setprop(ec~"boundary/entry[0]/temperature-degc",T);
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fgcommand("reinit", props.Node.new({subsystem:"environment"}));
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}
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}
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####################################
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# set pressure to given value
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####################################
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var setPressure = func (p) {
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if (features.can_disable_environment == 1)
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{
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setprop("/environment/pressure-sea-level-inhg",p);
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}
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else
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{
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# this is a workaround for systems which lack hard-coded support
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# essentially we update the entry in config and reinit environment
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setprop(ec~"boundary/entry[0]/pressure-sea-level-inhg",p);
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setprop(ec~"aloft/entry[0]/pressure-sea-level-inhg",p);
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fgcommand("reinit", props.Node.new({subsystem:"environment"}));
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}
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}
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####################################
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# set dewpoint to given value
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####################################
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var setDewpoint = func (D) {
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if (features.can_disable_environment == 1)
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{
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setprop("/environment/dewpoint-sea-level-degc",D);
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}
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else
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{
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# this is a workaround for systems which lack hard-coded support
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# essentially we update the entry in config and reinit environment
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setprop(ec~"boundary/entry[0]/dewpoint-degc",D);
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fgcommand("reinit", props.Node.new({subsystem:"environment"}));
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}
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}
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####################################
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# set light saturation to given value
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####################################
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var setLight = func (s) {
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if (features.can_set_light == 1)
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{
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setprop("/rendering/scene/saturation",s);
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}
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}
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####################################
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# set horizon scattering
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####################################
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var setScattering = func (s) {
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if (features.can_set_scattering == 1)
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{
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setprop("/rendering/scene/scattering",s);
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}
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}
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####################################
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# set overcast haze
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####################################
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var setOvercast = func (o) {
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if (features.can_set_scattering == 1)
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{
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setprop("/rendering/scene/overcast",o);
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}
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}
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###########################################################
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# set wind to given direction and speed
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###########################################################
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var setWind = func (dir, speed) {
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if (features.can_disable_environment == 1)
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{
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setprop("/environment/wind-from-heading-deg",dir);
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setprop("/environment/wind-speed-kt",speed);
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}
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else
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{
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# this is a workaround for systems which lack hard-coded support
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# essentially we update all entries in config and reinit environment
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var entries_aloft = props.globals.getNode("environment/config/aloft", 1).getChildren("entry");
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foreach (var e; entries_aloft) {
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e.getNode("wind-from-heading-deg",1).setValue(dir);
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e.getNode("wind-speed-kt",1).setValue(speed);
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}
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var entries_boundary = props.globals.getNode("environment/config/boundary", 1).getChildren("entry");
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foreach (var e; entries_boundary) {
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e.getNode("wind-from-heading-deg",1).setValue(dir);
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e.getNode("wind-speed-kt",1).setValue(speed);
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}
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fgcommand("reinit", props.Node.new({subsystem:"environment"}));
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}
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}
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###########################################################
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# set wind smoothly to given direction and speed
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# interpolating across several frames
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###########################################################
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var setWindSmoothly = func (dir, speed) {
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if (features.can_disable_environment == 1)
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{
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setWind(dir, speed);
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}
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else
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{
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var entries_aloft = props.globals.getNode("environment/config/aloft", 1).getChildren("entry");
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var dir_old = entries_aloft[0].getNode("wind-from-heading-deg",1).getValue();
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var speed_old = entries_aloft[0].getNode("wind-speed-kt",1).getValue();
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var dir = dir * math.pi/180.0;
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var dir_old = dir_old * math.pi/180.0;
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var vx = speed * math.sin(dir);
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var vx_old = speed_old * math.sin(dir_old);
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var vy = speed * math.cos(dir);
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var vy_old = speed_old * math.cos(dir_old);
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smooth_wind_loop(vx,vy,vx_old, vy_old, 4, 4);
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}
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}
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var smooth_wind_loop = func (vx, vy, vx_old, vy_old, counter, count_max) {
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var time_delay = 0.9/count_max;
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if (counter == 0) {return;}
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var f = (counter -1)/count_max;
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var vx_set = f * vx_old + (1-f) * vx;
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var vy_set = f * vy_old + (1-f) * vy;
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var speed_set = math.sqrt(vx_set * vx_set + vy_set * vy_set);
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var dir_set = math.atan2(vx_set,vy_set) * 180.0/math.pi;
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setWind(dir_set,speed_set);
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settimer( func {smooth_wind_loop(vx,vy,vx_old,vy_old,counter-1, count_max); },time_delay);
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}
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###########################################################
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# place a single cloud
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###########################################################
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var create_cloud = func(path, lat, long, alt, heading) {
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var tile_counter = getprop(lw~"tiles/tile-counter");
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var buffer_flag = getprop(lw~"config/buffer-flag");
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var d_max = weather_tile_management.cloud_view_distance + 1000.0;
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# check if we deal with a convective cloud
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var convective_flag = 0;
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if (find("cumulus",path) != -1)
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{
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if ((find("alto",path) != -1) or (find("cirro", path) != -1) or (find("strato", path) != -1))
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{convective_flag = 0;}
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else if ((find("small",path) != -1) or (find("whisp",path) != -1))
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{convective_flag = 1;}
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else if (find("bottom",path) != -1)
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{convective_flag = 4;}
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else
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{convective_flag = 2;}
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}
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else if (find("congestus",path) != -1)
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{
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if (find("bottom",path) != -1)
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{convective_flag = 5;}
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else
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{convective_flag = 3;}
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}
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#print("path: ", path, " flag: ", convective_flag);
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# first check if the cloud should be stored in the buffer
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# we keep it if it is in visual range or at high altitude (where visual range is different)
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if (buffer_flag == 1)
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{
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# calculate the distance to the aircraft
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var pos = geo.aircraft_position();
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var cpos = geo.Coord.new();
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cpos.set_latlon(lat,long,0.0);
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var d = pos.distance_to(cpos);
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if ((d > d_max) and (alt < 20000.0)) # we buffer the cloud
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{
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var b = weather_tile_management.cloudBuffer.new(lat, long, alt, path, heading, tile_counter, convective_flag);
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if (local_weather.dynamics_flag ==1)
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{
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b.timestamp = weather_dynamics.time_lw;
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if (convective_flag !=0) # Cumulus clouds get some extra info
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{
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b.evolution_timestamp = cloud_evolution_timestamp;
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b.flt = cloud_flt;
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b.rel_alt = alt - cloud_mean_altitude;
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}
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}
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append(weather_tile_management.cloudBufferArray,b);
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return;
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}
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}
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# now check if we are writing from the buffer, in this case change tile index
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# to buffered one
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if (getprop(lw~"tmp/buffer-status") == "placing")
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{
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#tile_counter = getprop(lw~"tmp/buffer-tile-index");
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tile_counter = buffered_tile_index;
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}
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# if the cloud is not buffered, get property tree nodes and write it
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# into the scenery
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var n = props.globals.getNode("local-weather/clouds", 1);
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var c = n.getChild("tile",tile_counter,1);
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var cloud_number = n.getNode("placement-index").getValue();
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for (var i = cloud_number; 1; i += 1)
|
|
if (c.getChild("cloud", i, 0) == nil)
|
|
break;
|
|
cl = c.getChild("cloud", i, 1);
|
|
n.getNode("placement-index").setValue(i);
|
|
|
|
var placement_index = i;
|
|
|
|
var model_number = n.getNode("model-placement-index").getValue();
|
|
var m = props.globals.getNode("models", 1);
|
|
for (var i = model_number; 1; i += 1)
|
|
if (m.getChild("model", i, 0) == nil)
|
|
break;
|
|
model = m.getChild("model", i, 1);
|
|
n.getNode("model-placement-index").setValue(i);
|
|
|
|
|
|
|
|
var latN = cl.getNode("position/latitude-deg", 1); latN.setValue(lat);
|
|
var lonN = cl.getNode("position/longitude-deg", 1); lonN.setValue(long);
|
|
var altN = cl.getNode("position/altitude-ft", 1); altN.setValue(alt);
|
|
var hdgN = cl.getNode("orientation/true-heading-deg", 1); hdgN.setValue(heading);
|
|
|
|
cl.getNode("tile-index",1).setValue(tile_counter);
|
|
|
|
model.getNode("path", 1).setValue(path);
|
|
model.getNode("latitude-deg-prop", 1).setValue(latN.getPath());
|
|
model.getNode("longitude-deg-prop", 1).setValue(lonN.getPath());
|
|
model.getNode("elevation-ft-prop", 1).setValue(altN.getPath());
|
|
model.getNode("heading-deg-prop", 1).setValue(hdgN.getPath());
|
|
model.getNode("tile-index",1).setValue(tile_counter);
|
|
model.getNode("load", 1).remove();
|
|
|
|
|
|
# sort the model node into a vector for easy deletion
|
|
# append(weather_tile_management.modelArrays[tile_counter-1],model);
|
|
|
|
# sort the cloud into the cloud hash array
|
|
|
|
if (buffer_flag == 1)
|
|
{
|
|
var cs = weather_tile_management.cloudScenery.new(tile_counter, convective_flag, cl, model);
|
|
append(weather_tile_management.cloudSceneryArray,cs);
|
|
}
|
|
|
|
# if weather dynamics is on, also create a timestamp property and sort the cloud hash into quadtree
|
|
|
|
if (local_weather.dynamics_flag == 1)
|
|
{
|
|
cs.timestamp = weather_dynamics.time_lw;
|
|
cs.write_index = placement_index;
|
|
|
|
if (convective_flag !=0) # Cumulus clouds get some extra info
|
|
{
|
|
cs.evolution_timestamp = cloud_evolution_timestamp;
|
|
cs.flt = cloud_flt;
|
|
cs.rel_alt = alt - cloud_mean_altitude;
|
|
cs.target_alt = alt;
|
|
}
|
|
|
|
if (getprop(lw~"tmp/buffer-status") == "placing")
|
|
{
|
|
var blat = buffered_tile_latitude;
|
|
var blon = buffered_tile_longitude;
|
|
var alpha = buffered_tile_alpha;
|
|
#var blat1 = getprop(lw~"tiles/tmp/latitude-deg");
|
|
#var blon1 = getprop(lw~"tiles/tmp/longitude-deg");
|
|
#var alpha1 = getprop(lw~"tmp/tile-orientation-deg");
|
|
|
|
#print("Lat: ", blat1, " ", blat);
|
|
#print("Lon: ", blon1, " ", blon);
|
|
#print("Alp: ", alpha1, " ", alpha);
|
|
|
|
}
|
|
else
|
|
{
|
|
var blat = getprop(lw~"tiles/tmp/latitude-deg");
|
|
var blon = getprop(lw~"tiles/tmp/longitude-deg");
|
|
var alpha = getprop(lw~"tmp/tile-orientation-deg");
|
|
}
|
|
weather_dynamics.sort_into_quadtree(blat, blon, alpha, lat, long, weather_dynamics.cloudQuadtrees[tile_counter-1], cs);
|
|
}
|
|
|
|
}
|
|
|
|
|
|
###########################################################
|
|
# place a cloud layer from arrays, split across frames
|
|
###########################################################
|
|
|
|
var create_cloud_array = func (i, clouds_path, clouds_lat, clouds_lon, clouds_alt, clouds_orientation) {
|
|
|
|
if (getprop(lw~"tmp/thread-status") != "placing") {return;}
|
|
if (getprop(lw~"tmp/convective-status") != "idle") {return;}
|
|
if ((i < 0) or (i==0))
|
|
{
|
|
if (local_weather.debug_output_flag == 1)
|
|
{print("Cloud placement from array finished!"); }
|
|
setprop(lw~"tmp/thread-status", "idle");
|
|
|
|
# now set flag that tile has been completely processed
|
|
var dir_index = props.globals.getNode(lw~"tiles/tmp/dir-index").getValue();
|
|
|
|
props.globals.getNode(lw~"tiles").getChild("tile",dir_index).getNode("generated-flag").setValue(2);
|
|
|
|
return;
|
|
}
|
|
|
|
|
|
var k_max = 30;
|
|
var s = size(clouds_path);
|
|
|
|
if (s < k_max) {k_max = s;}
|
|
|
|
for (var k = 0; k < k_max; k = k+1)
|
|
{
|
|
if (getprop(lw~"config/dynamics-flag") ==1)
|
|
{
|
|
cloud_mean_altitude = local_weather.clouds_mean_alt[s-k-1];
|
|
cloud_flt = local_weather.clouds_flt[s-k-1];
|
|
cloud_evolution_timestamp = local_weather.clouds_evolution_timestamp[s-k-1];
|
|
}
|
|
create_cloud(clouds_path[s-k-1], clouds_lat[s-k-1], clouds_lon[s-k-1], clouds_alt[s-k-1], clouds_orientation[s-k-1]);
|
|
}
|
|
|
|
setsize(clouds_path,s-k_max);
|
|
setsize(clouds_lat,s-k_max);
|
|
setsize(clouds_lon,s-k_max);
|
|
setsize(clouds_alt,s-k_max);
|
|
setsize(clouds_orientation,s-k_max);
|
|
|
|
if (getprop(lw~"config/dynamics-flag") ==1)
|
|
{
|
|
setsize(local_weather.clouds_mean_alt,s-k_max);
|
|
setsize(local_weather.clouds_flt,s-k_max);
|
|
setsize(local_weather.clouds_evolution_timestamp,s-k_max);
|
|
}
|
|
|
|
settimer( func {create_cloud_array(i - k, clouds_path, clouds_lat, clouds_lon, clouds_alt, clouds_orientation ) }, 0 );
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
###########################################################
|
|
# get terrain elevation
|
|
###########################################################
|
|
|
|
var get_elevation = func (lat, lon) {
|
|
|
|
var info = geodinfo(lat, lon);
|
|
if (info != nil) {var elevation = info[0] * local_weather.m_to_ft;}
|
|
else {var elevation = -1.0; }
|
|
|
|
|
|
return elevation;
|
|
}
|
|
|
|
###########################################################
|
|
# get terrain elevation vector
|
|
###########################################################
|
|
|
|
var get_elevation_array = func (lat, lon) {
|
|
|
|
var elevation = [];
|
|
var n = size(lat);
|
|
|
|
|
|
for(var i = 0; i < n; i=i+1)
|
|
{
|
|
append(elevation, get_elevation(lat[i], lon[i]));
|
|
}
|
|
|
|
|
|
return elevation;
|
|
}
|
|
|
|
|
|
|
|
############################################################
|
|
# global variables
|
|
############################################################
|
|
|
|
# some common abbreviations
|
|
|
|
var lw = "/local-weather/";
|
|
var ec = "/environment/config/";
|
|
|
|
# storage arrays for model vector
|
|
|
|
var mvec = [];
|
|
var msize = 0;
|
|
|
|
# available hard-coded support
|
|
|
|
var features = {};
|
|
|
|
# globals to transmit info if clouds are written from buffer
|
|
|
|
var buffered_tile_latitude = 0.0;
|
|
var buffered_tile_longitude = 0.0;
|
|
var buffered_tile_alpha = 0.0;
|
|
var buffered_tile_index = 0;
|
|
|
|
# globals to handle additional info for Cumulus cloud dynamics
|
|
|
|
var cloud_mean_altitude = 0.0;
|
|
var cloud_flt = 0.0;
|
|
var cloud_evolution_timestamp = 0.0;
|