//##################################################################################################
//
//   Custom Visualization Core library
//   Copyright (C) 2011-2013 Ceetron AS
//
//   This library may be used under the terms of either the GNU General Public License or
//   the GNU Lesser General Public License as follows:
//
//   GNU General Public License Usage
//   This library is free software: you can redistribute it and/or modify
//   it under the terms of the GNU General Public License as published by
//   the Free Software Foundation, either version 3 of the License, or
//   (at your option) any later version.
//
//   This library is distributed in the hope that it will be useful, but WITHOUT ANY
//   WARRANTY; without even the implied warranty of MERCHANTABILITY or
//   FITNESS FOR A PARTICULAR PURPOSE.
//
//   See the GNU General Public License at <<http://www.gnu.org/licenses/gpl.html>>
//   for more details.
//
//   GNU Lesser General Public License Usage
//   This library is free software; you can redistribute it and/or modify
//   it under the terms of the GNU Lesser General Public License as published by
//   the Free Software Foundation; either version 2.1 of the License, or
//   (at your option) any later version.
//
//   This library is distributed in the hope that it will be useful, but WITHOUT ANY
//   WARRANTY; without even the implied warranty of MERCHANTABILITY or
//   FITNESS FOR A PARTICULAR PURPOSE.
//
//   See the GNU Lesser General Public License at <<http://www.gnu.org/licenses/lgpl-2.1.html>>
//   for more details.
//
//##################################################################################################


#include "cafEffectGenerator.h"
#include "cafEffectCache.h"

namespace caf {


//==================================================================================================
//
// EffectCache
//
//==================================================================================================

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
EffectCache::EffectCache()
{
    m_effectType = EffectGenerator::SHADER_BASED;
}

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
EffectCache* EffectCache::instance()
{
    static EffectCache staticInstance;

    return &staticInstance;
}


//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
cvf::Effect* EffectCache::findEffect(const EffectGenerator* generator)
{
    CVF_ASSERT(generator);

    // Effect cache does not support mixing of effect types. Clear cache if type changes.
    if (EffectGenerator::renderingMode() != m_effectType)
    {
        clear();
        m_effectType = EffectGenerator::renderingMode();
    }

    size_t i;
    for (i = 0; i < m_effectCache.size(); i++)
    {
        if (m_effectCache[i].first->isEqual(generator))
        {
            cvf::ref<cvf::Effect> effect = m_effectCache[i].second;
            return effect.p();
        }
    }

    return NULL;
}

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
void EffectCache::clear()
{
    size_t i;
    for (i = 0; i < m_effectCache.size(); i++)
    {
        EffectGenerator* effGenerator = m_effectCache[i].first;
        delete effGenerator;
    }

    m_effectCache.clear();
}

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
void EffectCache::addEffect(const EffectGenerator* generator, cvf::Effect* effect)
{
    EffectGenerator* myCopy = generator->copy();
    m_effectCache.push_back(std::make_pair(myCopy, effect));
}

//--------------------------------------------------------------------------------------------------
/// 
//--------------------------------------------------------------------------------------------------
void EffectCache::releaseUnreferencedEffects()
{
    std::vector<std::pair<EffectGenerator*, cvf::ref<cvf::Effect> > > newCache;
    size_t i;
    for (i = 0; i < m_effectCache.size(); i++)
    {
        if (m_effectCache[i].second.p()->refCount() <= 1 )
        {
            m_effectCache[i].second = NULL;
            delete m_effectCache[i].first;
            m_effectCache[i].first = NULL;
        }
        else
        {
            newCache.push_back(m_effectCache[i]);
        }
    }
    
    m_effectCache.swap(newCache);
}


}