Function PreStepEmscripten

engine/engine/src/engine_loop.cpp:133–184

#if defined(__EMSCRIPTEN__)
    static void PreStepEmscripten(void* _ctx)
    {
        StepContext* ctx = (StepContext*)_ctx;
        const RunLoopParams* params = ctx->m_Params;
        HEngine engine = (HEngine)ctx->m_Engine;

        int exit_code = 0;
        int result = 0;
        params->m_EngineGetResult(engine, &result, &exit_code, NULL, NULL);

        if (RESULT_OK != result)
        {
            dmCrash::SetEnabled(false); // because emscripten_cancel_main_loop throws an 'unwind' exception (emscripten issue #11682)
            emscripten_pause_main_loop(); // stop further callbacks
            emscripten_cancel_main_loop(); // Causes an exception (emscripten issue #11682)

            params->m_EngineDestroy(engine);
            engine = 0;

            if (RESULT_REBOOT == result)
            {
                // Only request argc/argv when actually rebooting
                int argc = 0;
                char** argv = NULL;
                params->m_EngineGetResult(engine, NULL, NULL, &argc, &argv);

                ctx->m_Engine = params->m_EngineCreate(argc, argv);

                // Free argv allocated within dmEngineGetResult
                for (int i = 0; i < argc; ++i)
                    free(argv[i]);
                free(argv);

                if (ctx->m_Engine)
                {
                    // Won't return from this
                    emscripten_set_main_loop_arg(PerformStep, ctx, 0, 1);
                }
                else {
                    dmLogError("Engine failed to reboot");
                    exit_code = 1;
                }
            }

            dmLogInfo("Engine exited with code %d", exit_code);
            exit(exit_code);
        }

        if (!dmCrash::IsEnabled()) {
            dmCrash::SetEnabled(true);
        }
    }

    static void PerformStep(void* _ctx)
    {