feat(core): add chunk storage and world container

core/include/vf/Chunk.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <array>
+#include "Block.h"
+
+namespace vf {
+
+constexpr int chunkSize = 16;
+constexpr int chunkVolume = chunkSize * chunkSize * chunkSize;
+
+inline bool inChunkBounds(int x, int y, int z) {
+    return x >= 0 && x < chunkSize && y >= 0 && y < chunkSize && z >= 0 && z < chunkSize;
+}
+
+inline int localIndex(int x, int y, int z) {
+    return (y * chunkSize + z) * chunkSize + x;
+}
+
+class Chunk {
+public:
+    Chunk() { blocks.fill(Block::Air); }
+
+    Block at(int x, int y, int z) const { return blocks[localIndex(x, y, z)]; }
+    void set(int x, int y, int z, Block b) { blocks[localIndex(x, y, z)] = b; }
+
+    bool empty() const {
+        for (Block b : blocks)
+            if (b != Block::Air) return false;
+        return true;
+    }
+
+    const std::array<Block, chunkVolume>& raw() const { return blocks; }
+    std::array<Block, chunkVolume>& raw() { return blocks; }
+
+private:
+    std::array<Block, chunkVolume> blocks;
+};
+
+} // namespace vf