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glt/dlcache.cpp

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#include "dlcache.h"

#include <glt/error.h>

using namespace std;


GltDisplayListCache::GltDisplayListCache(const uint32 capacity)
: _capacity(capacity)
{
    _lists.reserve(capacity);
    assert(capacity>0);
}

GltDisplayListCache::~GltDisplayListCache()
{
    clear();
}

void
GltDisplayListCache::draw(const uint32 seed)
{
    GLuint *id = _lru.find(seed);

    GLERROR;

    if (id)
        glCallList(*id);
    else
    {
        GLuint list;

        if (_lru.size()>=_capacity)
            list = _lru.insert(seed);
        else
        {
            list = glGenLists(1);
            _lists.push_back(list);
            _lru.insert(seed,list);
        }

        // Compile and draw the display list

        glNewList(list,GL_COMPILE_AND_EXECUTE);
        OnDraw(seed);
        glEndList();
    }

    GLERROR;
}   

void 
GltDisplayListCache::clear()
{
    if (!_lists.size() && !_lru.size())
        return;

    GLERROR;

    // Free OpenGL display lists
    for (int i=0; i<_lists.size(); i++)
        glDeleteLists(_lists[i],1);
    
    GLERROR;

    // Clear OpenGL display list inventory
    _lists.clear();

    // Clear LRU Cache
    _lru.clear();
}

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