void performDrawOpsAndCode()
{
// Allows us to make some assumptions.
if (ops.empty())
{
for (CodeMap::iterator it = code.begin(), end = code.end(); it != end; ++it)
it->second();
return;
}
// Apply Z-Ordering.
std::stable_sort(ops.begin(), ops.end());
// We will loop: Drawing DrawOps, execute custom code.
// This means if there is no code, we just draw one batch
// of DrawOps, so no performance is sacrified.
DrawOps::const_iterator current = ops.begin(), last = ops.begin();
CodeMap::const_iterator it = code.begin();
while (true)
{
if (it == code.end())
// Last or only batch of DrawOps:
// Just draw everything.
last = ops.end() - 1;
else
{
// There is code waiting:
// Only draw up to this Z level.
while (last != ops.end() - 1 && (last + 1)->z < it->first)
++last;
}
if (current <= last)
{
// Draw DrawOps until next code is due
RenderState renderState;
while (current < last)
{
DrawOps::const_iterator next = current + 1;
current->perform(renderState, &*next);
current = next;
}
last->perform(renderState, 0);
++current;
}
// Draw next code, or break if there is none
if (it == code.end())
break;
else
{
it->second();
++it;
}
}
}
