urho3d/Source/Urho3D/Engine/Application.cpp

//
// Copyright (c) 2008-2015 the Urho3D project.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

#include "../Engine/Application.h"
#include "../Engine/Engine.h"
#ifdef IOS
#include "../Graphics/Graphics.h"
#include "../Graphics/GraphicsImpl.h"
#endif
#include "../IO/IOEvents.h"
#include "../IO/Log.h"
#include "../Core/ProcessUtils.h"

#include <exception>

#include "../DebugNew.h"

namespace Urho3D
{

#ifdef IOS
// Code for supporting SDL_iPhoneSetAnimationCallback
void RunFrame(void* data)
{
    Application* instance = reinterpret_cast<Application*>(data);
    instance->GetSubsystem<Engine>()->RunFrame();
}
#endif

#if defined(EMSCRIPTEN)
#include <emscripten.h>
// REVISIT: it seems there should only be one instance of Application
// and it's needed here as there's no way to pass it along with a callback
// for emscripten_set_main_loop() so just store a static pointer here for now
static Application *emInstance = 0;
void RunFrame()
{
    if (emInstance)
        emInstance->GetSubsystem<Engine>()->RunFrame();
}
#endif
    
Application::Application(Context* context) :
    Object(context),
    exitCode_(EXIT_SUCCESS)
{
    engineParameters_ = Engine::ParseParameters(GetArguments());

    // Create the Engine, but do not initialize it yet. Subsystems except Graphics & Renderer are registered at this point
    engine_ = new Engine(context);
    
    // Subscribe to log messages so that can show errors if ErrorExit() is called with empty message
    SubscribeToEvent(E_LOGMESSAGE, HANDLER(Application, HandleLogMessage));
}

int Application::Run()
{
#if !defined(EMSCRIPTEN) // TODO: do we really need to do this?
    try
    {
#endif
        Setup();
        if (exitCode_)
            return exitCode_;
		
        if (!engine_->Initialize(engineParameters_))
        {
            ErrorExit();
            return exitCode_;
        }

        Start();
        if (exitCode_)
            return exitCode_;

        // Platforms other than iOS and EMSCRIPTEN run a blocking main loop
        #if !defined(IOS) && !defined(EMSCRIPTEN)
        while (!engine_->IsExiting())
            engine_->RunFrame();

        Stop();
        // iOS will setup a timer for running animation frames so eg. Game Center can run. In this case we do not
        // support calling the Stop() function, as the application will never stop manually
        #else
        #if defined(IOS)
        SDL_iPhoneSetAnimationCallback(GetSubsystem<Graphics>()->GetImpl()->GetWindow(), 1, &RunFrame, this);
        #else
        // EMSCRIPTEN
        emInstance = this; 
        emscripten_set_main_loop(RunFrame, 0, 1);
	
        #endif
        #endif
        
        return exitCode_;
#if !defined(EMSCRIPTEN)
    }
    catch (std::bad_alloc&)
    {
        ErrorDialog(GetTypeName(), "An out-of-memory error occurred. The application will now exit.");
        return EXIT_FAILURE;
    }
#endif
}

void Application::ErrorExit(const String& message)
{
    engine_->Exit(); // Close the rendering window
    exitCode_ = EXIT_FAILURE;

    // Only for WIN32, otherwise the error messages would be double posted on Mac OS X and Linux platforms
    if (!message.Length())
    {
        #ifdef WIN32
        ErrorDialog(GetTypeName(), startupErrors_.Length() ? startupErrors_ :
            "Application has been terminated due to unexpected error.");
        #endif
    }
    else
        ErrorDialog(GetTypeName(), message);
}

void Application::HandleLogMessage(StringHash eventType, VariantMap& eventData)
{
    using namespace LogMessage;
    
    if (eventData[P_LEVEL].GetInt() == LOG_ERROR)
    {
        // Strip the timestamp if necessary
        String error = eventData[P_MESSAGE].GetString();
        unsigned bracketPos = error.Find(']');
        if (bracketPos != String::NPOS)
            error = error.Substring(bracketPos + 2);
        
        startupErrors_ += error + "\n";
    }
}


}