Method Load

src/simulation/Simulation.cpp:50–340

}

void Simulation::Load(const GameSave *save, bool includePressure, Vec2<int> blockP) // block coordinates
{
	auto partP = blockP * CELL;

	auto &sd = SimulationData::CRef();
	auto &elements = sd.elements;

	RecalcFreeParticles(false);

	struct ExistingParticle
	{
		int id;
		Vec2<int> pos;
	};
	std::vector<ExistingParticle> existingParticles;
	auto pasteArea = RES.OriginRect() & RectSized(partP, save->blockSize * CELL);
	for (int i = 0; i < parts.active; i++)
	{
		if (parts[i].type)
		{
			auto p = Vec2<int>{ int(parts[i].x + 0.5f), int(parts[i].y + 0.5f) };
			if (pasteArea.Contains(p))
			{
				existingParticles.push_back({ i, p });
			}
		}
	}
	std::sort(existingParticles.begin(), existingParticles.end(), [](const auto &lhs, const auto &rhs) {
		return std::tie(lhs.pos.Y, lhs.pos.X) < std::tie(rhs.pos.Y, rhs.pos.X);
	});
	PlaneAdapter<std::vector<size_t>> existingParticleIndices(pasteArea.size, existingParticles.size());
	{
		auto lastPos = Vec2<int>{ -1, -1 }; // not a valid pos in existingParticles
		for (auto it = existingParticles.begin(); it != existingParticles.end(); ++it)
		{
			if (lastPos != it->pos)
			{
				existingParticleIndices[it->pos - pasteArea.pos] = it - existingParticles.begin();
				lastPos = it->pos;
			}
		}
	}
	auto removeExistingParticles = [this, pasteArea, &existingParticles, &existingParticleIndices](Vec2<int> p) {
		auto rp = p - pasteArea.pos;
		if (existingParticleIndices.Size().OriginRect().Contains(rp))
		{
			auto index = existingParticleIndices[rp];
			for (auto it = existingParticles.begin() + index; it != existingParticles.end() && it->pos == p; ++it)
			{
				kill_part(it->id);
			}
			existingParticleIndices[rp] = existingParticles.size();
		}
	};

	auto oldPrettyPowders = pretty_powder;
	pretty_powder = false;
	Defer restorePrettyPowders([this, oldPrettyPowders]() {