unsigned int GL::LightHandler::AddLight(const GL::Light& light) {
if (light.GetTTL() == 0 || light.GetRadius() <= 0.0f) { return -1U; }
if (light.GetIntensityWeight().SqLength() <= 0.01f) { return -1U; }
if (lights.size() >= maxLights || lightIDs.empty()) {
unsigned int minPriorityValue = light.GetPriority();
unsigned int minPriorityHandle = -1U;
for (std::map<unsigned int, GL::Light>::const_iterator it = lights.begin(); it != lights.end(); ++it) {
const GL::Light& lgt = it->second;
if (lgt.GetPriority() < minPriorityValue) {
minPriorityValue = lgt.GetPriority();
minPriorityHandle = it->first;
}
}
if (minPriorityHandle != -1U) {
lightIntensityWeight -= lights[minPriorityHandle].GetIntensityWeight();
lightIDs.push_back(lights[minPriorityHandle].GetID());
lights.erase(minPriorityHandle);
} else {
// no available light to replace
return -1U;
}
}
lights[lightHandle] = light;
lights[lightHandle].SetID(lightIDs.front());
lights[lightHandle].SetRelativeTime(0);
lights[lightHandle].SetAbsoluteTime(gs->frameNum);
lightIntensityWeight += light.GetIntensityWeight();
lightIDs.pop_front();
return (lightHandle++);
}
