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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef LUA_DISPLAY_LISTS_H
#define LUA_DISPLAY_LISTS_H
#include <vector>
#include "Rendering/GL/MatrixStateTracker.h"
class CLuaDisplayLists {
public:
CLuaDisplayLists() { Clear(); }
~CLuaDisplayLists() {
// free the display lists
// NOTE:
// it is not an error to delete a list with id=0, but we might
// be called from ~LuaParser which can run in multiple threads
// and the null-list is always present (even after Clear())
for (size_t i = 1; i < active.size(); i++) {
glDeleteLists(active[i].id, 1);
}
}
void Clear() {
unused.clear();
active.clear();
active.push_back(DLdata(0));
}
unsigned int GetCount() const { return active.size(); }
GLuint GetDList(unsigned int index) const
{
if (index < active.size())
return active[index].id;
return 0;
}
SMatrixStateData GetMatrixState(unsigned int index) const
{
if (index < active.size())
return active[index].matData;
return SMatrixStateData();
}
unsigned int NewDList(GLuint dlist, SMatrixStateData& m)
{
if (dlist == 0)
return 0;
if (!unused.empty()) {
const unsigned int index = unused[unused.size() - 1];
active[index] = DLdata(dlist, m);
unused.pop_back();
return index;
}
active.push_back(DLdata(dlist, m));
return active.size() - 1;
}
void FreeDList(unsigned int index)
{
if ((index < active.size()) && (active[index].id != 0)) {
active[index] = DLdata(0);
unused.push_back(index);
}
}
private:
struct DLdata {
DLdata(int i): id(i) {}
DLdata(int i, SMatrixStateData &m): id(i), matData(m) {}
GLuint id;
SMatrixStateData matData;
};
std::vector<DLdata> active;
std::vector<unsigned int> unused; // references slots in active
};
#endif /* LUA_DISPLAY_LISTS_H */
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