FeatherMC/src/world/Chunk.h

#pragma once

#include "Common.h"
#include "Types.h"

#include "nbt/NBT.h"
#include "PalettedContainer.h"
#include "block/state/BlockState.h"

namespace Feather
{
	// 16x16x16 sections of a chunk
	struct ChunkSection
	{
        static constexpr size_t NUM_BLOCKS = (16 * 16 * 16);

        static constexpr size_t MAX_BITS = Math::CeilLog2(NUM_BLOCKS);

        static constexpr size_t DEFAULT_BITS = 4;

        PalettedContainer<uint64, NUM_BLOCKS, MAX_BITS> blockStates;

    public:
        ChunkSection() : blockStates(NUM_BLOCKS, DEFAULT_BITS) {}
	};

	// Chunk: 16x256x16 world chunk
	class Chunk
	{
	public:
		static constexpr int NUM_SECTIONS = 16;

		// Each chunk is made of up 16 ChunkSections
		ChunkSection sections[NUM_SECTIONS];

		ChunkPos pos;

		// TODO: Nuke this shit!
		std::unique_ptr<NBT::CompoundTag> nbt;

		// TODO: save heightmaps here
		// UNSERIALIZED
		//const NBT::CompoundTag* heightmaps;

		Chunk(ChunkPos& pos, std::unique_ptr<NBT::CompoundTag> tag);

        inline int GetSection(BlockPos& pos) { return pos.y >> 4; }

		bool SetBlock(BlockPos& pos, BlockState& state);
	};
};