Setting up the Worker SDK in C++

Requirements

Prerequisites

Follow the SpatialOS tools installation guide (Windows / macOS / Linux). This is a prerequisite for using the Worker SDK.

Supported compilers and runtimes

The Worker SDK in C++ requires a C++11-compliant compiler. We compile native libraries which target at least the following toolchains and platforms:

• Windows: Microsoft Visual Studio 2015 Update 3 and above.
• macOS: Xcode 10 targeting OS X Yosemite (10.10) and above.
• Linux: gcc 5.4.0 with GLIBCXX_3.4.21 and above.
• iOS: iOS 11.4 and above.
• Android: Android API level 24 and above.
• PS4 and Xbox One: See Game console development.

On Windows, if you choose to use a worker package which has been compiled with the /MD or /MDd flags (multithreaded dynamic, and multithreaded dynamic debug), then any system which uses these libraries (including client systems) will also require Visual C++ Redistributable for Visual Studio 2015. Usually, MSVC projects use the multi-threaded dynamic runtime (/MD) in the Release configuration, and the multi-threaded dynamic debug runtime (/MDd) in the Debug configuration.

Packages

You can obtain packages through worker packages, our package management framework. You can specify these packages in a spatialos_worker_packages.json or download them manually by running spatial package get worker_sdk <package_name> <version> <destination zip> (for example: spatial package get worker_sdk cpp_headers 14.0.0 windows.zip).

The Worker SDK in C++ is a header only library that wraps the Worker SDK for C, and is designed to work on the same set of platforms and configurations. To use the Worker SDK for C++, you’ll need to obtain the header files from the package below, plus the relevant Worker SDK to C library to link against. For more information, see Building a worker.

The tables below list all the packages you can retrieve, relevant to the Worker SDK for C++:

Setting up a worker using the SpatialOS build system

Assuming you have a worker set up with a worker configuration file, and assuming that worker_dir is <project_root>/workers/<your_worker> you can obtain the relevant worker package as follows:

1. First you’ll need to add a file called <worker_dir>/spatialos_worker_packages.json to download the header files and libraries to <worker_dir>/dependencies/worker_sdk.

   In this file, we specify a set of packages to download during spatial worker build. We’ve provided an example below to start you off. In this example, we download both the Multithreaded Dynamic (MD) and Multithreaded Dynamic Debug (MDd) packages on Windows, plus binaries for macOS and Linux platforms to enable cross platform development. You’d need to later set up a build system and import the relevant libraries into your chosen build system.

   spatialos_worker_packages.json:

   {
   "targets": [
   {
     "path": "dependencies/worker_sdk/headers",
     "type": "worker_sdk",
     "packages": [
       {
         "name": "cpp_headers"
       }
     ]
   },
   {
     "path": "dependencies/worker_sdk/lib/windows/debug",
     "type": "worker_sdk",
     "packages": [
       {
         "name": "c-static-x86_64-vc140_mdd-win32"
       }
     ]
   },
   {
     "path": "dependencies/worker_sdk/lib/windows/release",
     "type": "worker_sdk",
     "packages": [
       {
         "name": "c-static-x86_64-vc140_md-win32"
       }
     ]
   },
   {
     "path": "dependencies/worker_sdk/lib/macos",
     "type": "worker_sdk",
     "packages": [
       {
         "name": "c-static-x86_64-clang-macos"
       }
     ]
   },
   {
     "path": "dependencies/worker_sdk/lib/linux",
     "type": "worker_sdk",
     "packages": [
       {
         "name": "c-static-x86_64-gcc510-linux"
       }
     ]
   }
   ]
   }

2. In a terminal, cd to <worker_dir> and run spatial package unpack (which is done automatically by spatial worker build if unpack dependencies is specified in the build.json).

   This will unpack the worker package specified above into the sub-directory. The downloaded worker package will be compatible with the SpatialOS SDK version used for your application (specified in <root>/spatialos.json under sdk_version).

Head to Building a worker for the next steps.

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