Add entity map

game/entity_map.h

@@ -0,0 +1,60 @@
+#ifndef PIXELDEFENSE_ENTITY_MAP_H
+#define PIXELDEFENSE_ENTITY_MAP_H
+
+#include <breeze.h>
+#include <flecs.h>
+
+#include "components.h"
+
+typedef struct EntityMapIndex {
+    i32 minX, minY;
+    i32 maxX, maxY;
+} EntityMapIndex;
+
+typedef struct EntityMapEntry {
+    ecs_entity_t entity;
+    i32 queryIdx;
+    i32 entryID;
+    EntityMapIndex index;
+} EntityMapEntry;
+
+typedef i32 EntityMapCell;
+
+typedef struct EntityMap {
+    EntityMapEntry *entities;
+    EntityMapCell *cells;
+    i32 width;
+    i32 height;
+    i32 cellResolution;
+    i32 cellDepth;
+} EntityMap;
+
+typedef struct EntityMapDesc {
+    i32 maxWidth;
+    i32 maxHeight;
+    i32 cellResolution;
+    i32 cellDepth;
+} EntityMapDesc;
+
+typedef struct EntityMapIter {
+    EntityMap *entityMap;
+    EntityMapEntry entry;
+    EntityMapIndex index;
+    i32 x;
+    i32 y;
+    i32 cellIdx;
+} EntityMapIter;
+
+EntityMap entityMapCreate(const EntityMapDesc *desc);
+void entityMapDestroy(EntityMap *entityMap);
+
+EntityMapEntry entityMapInsert(EntityMap *entityMap, ecs_entity_t entity, Position pos, Size size);
+void entityMapRemove(EntityMap *entityMap, EntityMapEntry entry);
+void entityMapRemoveID(EntityMap *entityMap, i32 entryID);
+
+EntityMapIter entityMapQueryIter(EntityMap *entityMap, Position pos, Size size);
+bool entityMapQueryNext(EntityMapIter *it);
+
+
+
+#endif //PIXELDEFENSE_ENTITY_MAP_H