20,741
edits
Howto:Start core development: Difference between revisions
Jump to navigation
Jump to search
m
→Plain C ? (Nasal)
| Line 262: | Line 262: | ||
The Nasal interpreter is part of the SimGear project, and can be found in $SG_SRC/nasal: http://gitorious.org/fg/simgear/trees/next/simgear/nasal | The Nasal interpreter is part of the SimGear project, and can be found in $SG_SRC/nasal: http://gitorious.org/fg/simgear/trees/next/simgear/nasal | ||
The longest-standing issue related to Nasal scripting is fixing its Garbage Collector (GC) to become generational, incremental or even concurrent, this is to reduce main loop impact (frame rate & frame spacing), see [[How the Nasal GC works]] to learn more. Almost certainly, we're going to adopt an existing GC library, or even implement an interface to experiment with different GC schemes, and allow those to be selected at startup. | |||
Adding new extension functions to the built-in Nasal interpreter is documented here: [[Howto: Extend Nasal]]. | Adding new extension functions to the built-in Nasal interpreter is documented here: [[Howto: Extend Nasal]]. | ||
| Line 271: | Line 273: | ||
Only the scripting interface connecting the Nasal interpreter and FlightGear is implemented in C++, it can be found in $FG_SRC/Scripting: http://gitorious.org/fg/flightgear/trees/next/src/Scripting | Only the scripting interface connecting the Nasal interpreter and FlightGear is implemented in C++, it can be found in $FG_SRC/Scripting: http://gitorious.org/fg/flightgear/trees/next/src/Scripting | ||
Basically, the scripting interface implements a custom SGSubsystem, so that the Nasal interpreter can be run as a FlightGear system. In addition, all FlightGear-specific extension functions are to be found there. Increasingly, this folder also contains wrappers to map FlightGear classes to Nasal space in an OOP fashion, so that not just functions, but full "objects" are provided, which are computed lazily. If that's what you are interested in, you should take a look at the | Basically, the scripting interface implements a custom SGSubsystem, so that the Nasal interpreter can be run as a FlightGear system. In addition, all FlightGear-specific extension functions are to be found there. Increasingly, this folder also contains wrappers to map FlightGear classes to Nasal space in an OOP fashion using the [[Nasal/CppBind]] framework, so that not just functions, but full "objects" are provided, which are computed lazily. If that's what you are interested in, you should take a look at the NasalPositioned_cppbind.cxx source code, which demonstrates how this is done. | ||
In other words, even without knowing C++, you can contribute to FlightGear core by extending the Nasal system. If you have some specific project in mind, you could probably implement it largely in scripting space using Nasal and only augment it as required with new extension functions in C space. | In other words, even without knowing C++, you can contribute to FlightGear core by extending the Nasal system. If you have some specific project in mind, you could probably implement it largely in scripting space using Nasal and only augment it as required with new extension functions in C space. | ||