laSegment.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: laSegment.cpp
// This class represents a signle segment of the level. The whole level is slinced in several
// such segments so that at any given time only the visible ones have to be rendered.
//
// Copyright (C) 2007-2013 Atanas Laskov, <latanas@gmail.com>
//
#include "stdafx.h"
#include "Core-Level-JR.h"

// Constructor
//
laSegment::laSegment(unsigned nIndex)
{
    // Initalize member variables
    //
    _nSegmentIndex = nIndex;

    _pTileset = NULL;
    _pPrev = _pNext = NULL;

    _nBackgroundElement = 0;
    _nLitterBoxCount = 0;
    _nCompilationID = 0;

    _bObjectListReset = M_FALSE;

    // Link the collision domains of individual tiles
    //
    laCollisionDomain *pNext;

    for(int y=0; y<M_SEGH; y++) for(int x=0; x<M_SEGW; x++)
    {
        if( x>=(M_SEGW-1) )
        {
            if(y>=(M_SEGH-1))   pNext = NULL;
            else                pNext = _arTiles[0][y+1].getDomain();
        }
        else pNext = _arTiles[x+1][y].getDomain();

        _arTiles[x][y].getDomain()->setNextDomain(pNext);
        _arTiles[x][y]._pSegment = this;
        _arTiles[x][y]._nSegX = x;
        _arTiles[x][y]._nSegY = y;
    }

    srand(::GetTickCount());
    _update_wave();
}

laSegment::~laSegment(void){
}

// Get terrain curviture properties form the TS
// and randomize them
//
void laSegment::_update_curviture_parameters()
{
    laPropertyList *pl = getTS()->getElement("terrain-curviture");

    _arTerrainCurvitureParams[0] = pl->getDouble("big") + pl->getDouble("big-variation")*(rand()%100)/100.0;    // big-scale
    _arTerrainCurvitureParams[1] = pl->getDouble("strange") + pl->getDouble("strange-variation")*(rand()%100)/100.0;    // strange
    _arTerrainCurvitureParams[2] = pl->getDouble("small") + pl->getDouble("small-variation")*(rand()%100)/100.0;    // small-scale
    _arTerrainCurvitureParams[3] = 0;
}


// Load segment from the level file
//
void laSegment::load(laFileParser* fp)
{
    unsigned j=0;
    laCollisionDomain *pNext;

    //Load the litter boxes
    fp->readUnsigned(&_nLitterBoxCount);

    if(_nLitterBoxCount>=M_MAXLITTER_BOX)
        throw laError("laSegment::load() failed: Too many litter boxes (%d requested, %d allowed)",
        _nLitterBoxCount, M_MAXLITTER_BOX);

    for(unsigned i=0; i<_nLitterBoxCount; i++)
    {
        fp->readObj(_arLitterBox+i, M_FALSE);
        _arLitterBox[i].litter(_pTileset);
    }

    //Load the tiles
    //
    for(int y=0; y<M_SEGH; y++)
    {
        for(int x=0; x<M_SEGW; x++)
        {
            //Read the object
            _arTiles[x][y].setTS(_pTileset);
            fp->readObj( &(_arTiles[x][y]), M_FALSE );
        }
    }
}

// Draw the terrain
//
void laSegment::drawTerrain(laRenderer *r)
{
    PROFILE_REN(laSegment_drawTerrain);
    ASSERT(_pTileset, "Invalid tileset object");
    ASSERT(_pLevel, "Invalid level object");

    // Draw background
    // TODO: This should be moved to drawBackground() and the offset appied ther for all segs at once ?
    //
    r->transPush();
    r->transTranslate( laPoint3(0,M_UNIT*M_SEGH) );
    _pTileset->getElement(_nBackgroundElement)->drawGeometry(r);

    for(unsigned i=0; i<_nLitterBoxCount; i++)
        _arLitterBox[i].drawGeometry(r, laPoint3());

    r->transPop();

    // Foreground
    //
    if(_nCompilationID)
    {
        // Draw everything as a precompitled object
        //
        r->compiledDraw( _nCompilationID );
        _draw_dynamic(r);                       //< except animated stuff
    }
    else
    {
        // Draw tiles indivudualy; remember in compilation _nCompilationID
        //
        _nCompilationID = r->compiledActivate(M_TRUE);
        _draw_static(r);
        r->compiledActivate(M_FALSE);
    }
}

void laSegment::_draw_static(laRenderer *r)
{
    PROFILE_REN(laSegment__draw_static);

    double dCurrentOffset, dCurrentAngle, dPreviousAngle, dScale;

    for(int x=0; x<M_SEGW; x++)
    {
        // For each column calculate the Z-offset
        // and curivture angle
        //
        dCurrentOffset  = terrainZOffset(x);
        dCurrentAngle   = terrainAngle(x);
        dPreviousAngle  = terrainAngle(x-1);
        dScale          = terrainScale(x);

        for(unsigned y=0; y<M_SEGH; y++)
        {
            if( _arTiles[x][y].isEmpty() ) continue;

            //r->vtexOffset( laPoint3(M_UNIT*x, M_UNIT*y) );
            laModel::edRotate(M_TRUE,   -dCurrentAngle);
            laModel::edBend(M_TRUE,     -dPreviousAngle + dCurrentAngle, dScale);
            laModel::edOffset(M_TRUE,   laPoint3(M_UNIT*x, M_UNIT*y, dCurrentOffset) );

            _arTiles[x][y].drawGeometry(r);

            laModel::edRotate(M_FALSE);
            laModel::edBend(M_FALSE);
            laModel::edOffset(M_FALSE);
        }
    }
}

// Draw tile geometry that cannot be cached
//
void laSegment::_draw_dynamic(laRenderer *r)
{
    PROFILE_REN(laSegment__draw_dynamic);

    // Terrain
    //
    double dCurrentOffset, dCurrentAngle;

    for(int x=0; x<M_SEGW; x++)
    {
        dCurrentOffset  = terrainZOffset(x);
        dCurrentAngle   = M_R2D(terrainAngle(x));

        for(unsigned y=0; y<M_SEGH; y++)
        {
            if( _arTiles[x][y].isEmpty() || _arTiles[x][y].isStatic() ) continue;

            r->transPush();
            r->transTranslate( laPoint3(M_UNIT*x, M_UNIT*y, dCurrentOffset + M_UNIT/2.0) );
            r->transRotate( dCurrentAngle, laPoint3(0,1,0)) ;
            r->transTranslate( laPoint3(0, 0, -M_UNIT/2.0) );

            //Draw
            _arTiles[x][y].drawDynamicGeometry( r );
            r->transPop();
        }
    }

}

void laSegment::drawObjects(laRenderer *r) {
    PROFILE_REN(laSegment__draw_objects);
    std::list<class laObject*>::iterator i;

    for(i=_listObjects.begin(); i!= _listObjects.end(); i++) (*i)->drawGeometry(r, laPoint3());
}

// Draw visual effects associated with the terrain grid
//
void laSegment::drawFx(laRenderer *r, const laPoint3 &pos)
{
    PROFILE_REN(laSegment_drawFx);
    ASSERT(_pTileset, "Invalid tileset object");
    ASSERT(_pLevel, "Invalid level object");

    // Terrain
    //
    double dCurrentOffset, dCurrentAngle;

    for(unsigned x=0; x<M_SEGW; x++)
    {
        dCurrentOffset  = terrainZOffset(x);
        dCurrentAngle   = M_R2D(terrainAngle(x));

        for(unsigned i=0; i<M_SEGH; i++)
        {
            if( _arTiles[x][i].isEmpty() || _arTiles[x][i].isWithoutFx() ) continue;

            // Position the tile
            // NOTE: No rotation intentionaly - it slows down things noticeably; it should not be needed for Fx,
            //
            r->transPush();
            r->transTranslate( pos + laPoint3(M_UNIT*x, M_UNIT*i, dCurrentOffset) );
            _arTiles[x][i].drawFx(r);
            r->transPop();
        }
    }

    // Objects
    //
    std::list<class laObject*>::iterator i;

    for(i=_listObjects.begin(); i!= _listObjects.end(); i++) (*i)->drawFx(r, laPoint3());

    // Litter boxes bg
    //
    for(unsigned i=0; i<_nLitterBoxCount; i++) _arLitterBox[i].drawFx(r, laPoint3(0,M_UNIT*M_SEGH));
}

// Animate the segment
//
void laSegment::animate(laTimer &t)
{
    ERRORLEVEL_BEGIN;
    PROFILE_ANIM(laSegment_animate);
    ASSERT(_pTileset, "Invalid tileset object");
    ASSERT(_pLevel, "Invalid level object");
    std::list<class laObject*>::iterator i = _listObjects.begin();

    // Animate objects contained in this segment
    // NOTE: This also takes care that any object out of bounds migrate to neighbouring segments
    //
    while( i != _listObjects.end() )
    {
        (*i)->animate(t);

        // In case sombody called _init_object_list() ( or otherwise changed the list ),
        // it's no longer possible to use the old iterator.
        // NOTE: This happens on rewspawn events / when the player character dies
        //
        if(_bObjectListReset) {
            _bObjectListReset = M_FALSE;
            break;
        }

        if( _pNext && ((*i)->getPosition().x() >= (_nSegmentIndex + 1) * M_UNIT * M_SEGW) )
        {
            _pNext->_migrate_object( *i );
            i = _listObjects.erase( i );
        }
        else if( _pPrev && ((*i)->getPosition().x() < _nSegmentIndex * M_UNIT * M_SEGW) )
        {
            _pPrev->_migrate_object( *i );
            i = _listObjects.erase( i );
        }
        else i++;

        ERRORLEVEL_ARG(ERRORLEVEL_ARGVAL + 1);
    }

    // Terrain
    for(unsigned i=0; i<M_SEGH; i++) for(unsigned j=0; j<M_SEGW; j++)
        _arTiles[j][i].animate(t);

    _update_wave();

    ERRORLEVEL_END;
}

// Initialize the list of objects within bounds
// Called by friend laLevel::load()
//
void laSegment::_init_object_list (  class laObject** par, unsigned n )
{
    _bObjectListReset = M_TRUE; // Indicate the list has changed; laSegment::animate() needs to know if it is active
    _listObjects.clear();

    for(unsigned i=0; i<n; i++)
    {
        if( par[i]->getPosition().x() >= (_nSegmentIndex + 1) * M_UNIT * M_SEGW ) continue;
        if( par[i]->getPosition().x() < _nSegmentIndex * M_UNIT * M_SEGW ) continue;

        _migrate_object( par[i] );
    }

    //MLOG("%d objects distributed to segment %d", _listObjects.size(), _nSegmentIndex);
}

// Animate the sin wave
//
void laSegment::_update_wave()
{
    PROFILE_ANIM(laSegment__update_wave);

    double dWaveOffset = (_pTileset) ? _pTileset->getAnimatedWaveOffset() : 0;
    double dx;

    for(unsigned x=0; x<=M_SEGW; x++)
    {
        dx = (_nSegmentIndex*(M_SEGW) + x)*M_UNIT*WAVE_FREQUENCY + dWaveOffset;
        _arWave[x] = sin( dx );
    }
}

// Initalize the collision domains of all tiles in the segment
//
void laSegment::bulidDomains(laPoint3 pos)
{
    laPoint3 ptTilePosition;

    _nCollisionDomainSize = 0;
    _nCollisionDomains = 0;

    for(unsigned i=0; i<M_SEGH; i++) for(unsigned j=0; j<M_SEGW; j++)
    {
        ptTilePosition = pos + laPoint3(j, i)*M_UNIT;

        unsigned n = _arTiles[j][i].bulidDomain( ptTilePosition );

        _nCollisionDomainSize += n;
        if(n) _nCollisionDomains++;
    }

    MLOG("This segment contains %d collision lines in %d domains", _nCollisionDomainSize, _nCollisionDomains);
}


double laSegment::terrainZOffset(int nX) {
    return _pLevel->terrainZOffset(nX + _nSegmentIndex*M_SEGW);
}

double laSegment::terrainAngle(int nX) {
    return _pLevel->terrainAngle(nX + _nSegmentIndex*M_SEGW);
}

double laSegment::terrainScale(int nX) {
    return _pLevel->terrainScale(nX + _nSegmentIndex*M_SEGW);
}