Restore some map stuff

src/map/mapchunk.h

@@ -0,0 +1,38 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "maptile.h"
+#include "worldpos.h"
+#include "display/mesh/quad.h"
+
+typedef struct chunk_s {
+  chunkpos_t position;
+  maptile_t tiles[CHUNK_TILE_COUNT];
+  
+  uint8_t meshCount;
+  meshvertex_t vertices[CHUNK_VERTEX_COUNT_MAX];
+  mesh_t meshes[CHUNK_MESH_COUNT_MAX];
+  uint8_t entities[CHUNK_ENTITY_COUNT_MAX];
+} mapchunk_t;
+
+/**
+ * Gets the tile index for a tile position within a chunk.
+ *
+ * @param position The position within the chunk.
+ * @return The tile index within the chunk.
+ */
+uint32_t mapChunkGetTileindex(const chunkpos_t position);
+
+/**
+ * Checks if two chunk positions are equal.
+ * 
+ * @param a The first chunk position.
+ * @param b The second chunk position.
+ * @return true if equal, false otherwise.
+ */
+bool_t mapChunkPositionIsEqual(const chunkpos_t a, const chunkpos_t b);