laGame.cpp

/*

Jump'n'Run Engine
http://www.atanaslaskov.com/jnr/

BSD LICENSE
Copyright (c) 2007-2013, Atanas Laskov
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL ATANAS LASKOV BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

//
// FILE: laGame.cpp
//
// Copyright (C) 2007-2013 Atanas Laskov, <latanas@gmail.com>
//
#include "stdafx.h"
#include "Core.h"

laGame::laGame()
{
    _bInitialized = _bFinalized = _bSwitchRequest = M_FALSE;
    _nActiveStage = _nSwitchStage = 0;
}

laGame::~laGame(void)
{
    std::vector<laStage*>::iterator iter;

    for (iter = _vStages.begin(); iter != _vStages.end(); iter++)
    {
        delete *iter;
    }
}

void laGame::addStage(laStage* pStage)
{
    ASSERT(!_bFinalized, "The game object is terminated.");

    _vStages.push_back(pStage);
    pStage->_pGame = this;
    pStage->bInitialized = M_FALSE;
}

// Request a different stage
// NOTE: This method doesn't switch the state immediately; Instead, it sets the _bSwitchRequest flag
// and at the beginning of the next onFrame(), the _switch_actions() does the job;
//
// WHY? Because calling onDesactivate() / onActivate() can mess up the current onFrame(),
// e.g. if they delete objects or change pointers.
//
void laGame::setStage(unsigned n)
{
    MLOG("Request for stage change (%d -> %d)", _nActiveStage, n);
    ASSERT(n < _vStages.size(), "Unimplemented stage requested in laGame::setStage(%d)", n);
    if(n==_nActiveStage)  return;

    if( _bInitialized )
    {
        _bSwitchRequest = M_TRUE;
        _nSwitchStage = n;
    }
    else _nActiveStage = n;
}

void laGame::_switch_actions()
{
    _bSwitchRequest = M_FALSE;          // The request is handled
    unsigned nTarget = _nSwitchStage;   // NOTE: It's important to copy, in case onActivate()
                                        // decides to make another state change


    if( _vStages[_nActiveStage]->bInitialized ) _vStages[_nActiveStage]->onDeactivate();

    if( !(_vStages[nTarget]->bInitialized) )
    {
        _vStages[nTarget]->onInit();
        _vStages[nTarget]->bInitialized = M_TRUE;
    }

    _vStages[nTarget]->onActivate();

    // Set to the new stage
    //
    MLOG("Active stage changed %d -> %d", _nActiveStage, nTarget);
    _nActiveStage = nTarget;
}

void laGame::setStage(char* strName)
{
    /*std::vector<laStage*>::iterator iter;
    unsigned n=0;

    for (iter = _vStages.begin(); iter != _vStages.end(); iter++)
    {
        if( !strcmp((*iter)->name(), strName) )
        {
            _nActiveStage = n;
            return;
        }
        n++;
    }*/

    throw laError("laGame::setStage('%s'): Not implemented", strName);
    //throw laError("Unimplemented Stage requested in laGame::setStage('%s')", strName);
}

laStage* laGame::getStage(unsigned n)
{
    ASSERT(n<_vStages.size(), "Unimplemented stage requested in laGame::getStage(%d)", n);

    return _vStages[n];
}

laStage* laGame::getStage(char* strName)
{
    /*std::vector<laStage*>::iterator iter;

    for (iter = _vStages.begin(); iter != _vStages.end(); iter++)
    {
        if( !strcmp((*iter)->name(), strName) )
        {
            return (*iter);
        }
    }*/

    throw laError("laGame::getStage('%s'): Not implemented", strName);
    //throw laError("Unimplemented Stage requested in laGame::getStage('%s')", strName);
}

void laGame::onInit()
{
    ASSERT(!_bInitialized, "Already initialized");
    _bInitialized = M_TRUE;

    // Initialize the starting stage
    //
    if( !(_vStages[_nActiveStage]->bInitialized) )
    {
        _vStages[_nActiveStage]->onInit();
        _vStages[_nActiveStage]->bInitialized = M_TRUE;
        _vStages[_nActiveStage]->onActivate();
    }
}

void laGame::onFini()
{
    ASSERT(!_bFinalized, "Already discarded");
    _bFinalized = M_TRUE;

    std::vector<laStage*>::iterator iter;

    //Destroy all created stages
    //
    for (iter = _vStages.begin(); iter != _vStages.end(); iter++)
        if(_vStages[_nActiveStage]->bInitialized) {
            (*iter)->onFini();
            (*iter)->bInitialized = M_FALSE;
        }
}

void laGame::onFrame(laRenderer *pr, laInputManager *pi, laTimer *pt)
{
    ASSERT(_nActiveStage < _vStages.size(), "Unimplemented stage requested (%d)", _nActiveStage);

    while(_bSwitchRequest) _switch_actions();       // Swith a new stage if there was a request
    _vStages[_nActiveStage]->onFrame(pr, pi, pt);
}