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

laStateObject::laStateObject(void)
{
    //_bExplicidDirection = M_FALSE;
    _nState = 0;
}

laStateObject::~laStateObject(void) {
}

void laStateObject::load(class laFileParser *fp)
{
    ERRORLEVEL_BEGIN;
    laObject::load(fp);

    laStaticModel* pm = getObject()->getModel(_nState)->framePtr();
    _animBlend.blend(pm, pm);

    ERRORLEVEL_END;
}

void laStateObject::create()
{
    ERRORLEVEL_BEGIN;

    laStaticModel* pm = getObject()->getModel(_nState)->framePtr();
    _animBlend.blend(pm, pm);

    ERRORLEVEL_END;
}

// Respawn
//
void laStateObject::respawn() {
    laObject::respawn();

    _nState = 0;
    //_nOldState = 0;
}

// Switch to a different state
//
void laStateObject::state(unsigned nState, double dBlendTime) {
    ASSERT( nState < getObject()->getModelCnt(), "Requested state %d not implemented in TS", nState);

    // Get a snapshot of the current frame and make a new blending animation
    //
    getStateModel()->snapshot(&_snapshot);
    _animBlend.blend( &_snapshot, getObject()->getModel(nState)->framePtr(), dBlendTime);

    _nState = nState;
    _dBlendTime = dBlendTime;
}

laAnimatedModel* laStateObject::getStateModel() {
    return ( _animBlend.frameIndex() < 1 ) ? &_animBlend : getObject()->getModel(_nState);
    //return getObject()->getModel(_nState);
}

// Draw geometry
//
// NOTE: This method is different form laObject::_draw_positioned_rotated() in that
// it draws only the 3D model corresponding to the active state, rather than all of them
// Do not call laObject::_draw_positioned_rotated() here, it will draw all states.
//
void laStateObject::_draw_positioned_rotated(laRenderer *r) {
    getStateModel()->draw( r );
}

// Draw FX
// TODO: Switch fx to state fx only?
//
void laStateObject::drawFx(laRenderer *r, laPoint3 ptBasePos) {
    laObject::drawFx(r, ptBasePos);
}

// This function determines state switches;
// Can be overloaded by laStateObject derivatives
//
unsigned laStateObject::_next_state(unsigned nCurrentState ) {
    return nCurrentState;
}

// Animate
//
void laStateObject::animate(laTimer &t)
{
    ERRORLEVEL_BEGIN;

    unsigned nNewState = this->_next_state(_nState);    //< derived objects can overload this

    // Detect changes of state
    //
    if( nNewState != _nState )
    {
        // Get a snapshot of the current frame and make a new blending animation
        //
        getStateModel()->snapshot(&_snapshot);
        _animBlend.blend( &_snapshot, getObject()->getModel(nNewState)->framePtr(), _dBlendTime);

        _nState = nNewState;
        //fxMessages.add(1, laColor(), "%d -> %d", _nOldState, _nState);
    }

    // Blend between the two states by useing the liner interpulation implemented in
    // laAnimated model
    //
    _animBlend.animate(t);

    // Default
    //
    laObject::animate(t);
    ERRORLEVEL_END;
}