Made a big mess of the codebase

src/rpg/world/overworld.c

@@ -0,0 +1,72 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "overworld.h"
+#include "chunk.h"
+#include "display/render.h"
+#include "assert/assert.h"
+#include "entity/entity.h"
+
+uint32_t OVERWORLD_CAMERA_X;
+uint32_t OVERWORLD_CAMERA_Y;
+overworldcameratype_t OVERWORLD_CAMERA_TYPE;
+
+void overworldInit(void) {
+  playerInit();
+  chunkMapInit();
+
+  OVERWORLD_CAMERA_X = 0;
+  OVERWORLD_CAMERA_Y = 0;
+  OVERWORLD_CAMERA_TYPE = OVERWORLD_CAMERA_TYPE_CENTERED_POSITION;
+}
+
+void overworldUpdate() {
+  entity_t *entity;
+
+  assertTrue(
+    OVERWORLD_CAMERA_X < OVERWORLD_CAMERA_LIMIT_X,
+    "Camera position limit (just because I haven't tested properly)"
+  );
+  assertTrue(
+    OVERWORLD_CAMERA_Y < OVERWORLD_CAMERA_LIMIT_Y,
+    "Camera position limit (just because I haven't tested properly)"
+  );
+  
+  entity = ENTITIES;
+  do {
+    entityUpdate(entity++);
+  } while(entity->type != ENTITY_TYPE_NULL);
+
+  // Testing, follow player
+  entity = &ENTITIES[0]; // Player entity
+  assertTrue(
+    entity->type == ENTITY_TYPE_PLAYER,
+    "First entity must be player"
+  );
+  OVERWORLD_CAMERA_X = entity->x * TILE_WIDTH_HEIGHT + entity->subX;
+  OVERWORLD_CAMERA_Y = entity->y * TILE_WIDTH_HEIGHT + entity->subY;
+
+  uint16_t x, y;
+  uint16_t halfWidth, halfHeight;
+  halfWidth = ((CHUNK_MAP_WIDTH - 1) * CHUNK_WIDTH * TILE_WIDTH_HEIGHT) / 2;
+  halfHeight = ((CHUNK_MAP_HEIGHT - 1) * CHUNK_HEIGHT * TILE_WIDTH_HEIGHT) / 2;
+
+  // Calculate the chunk map position based on the camera position.
+  if(OVERWORLD_CAMERA_X < halfWidth) {
+    x = 0;
+  } else {
+    x = (OVERWORLD_CAMERA_X - halfWidth) / (CHUNK_WIDTH*TILE_WIDTH_HEIGHT);
+  }
+
+  if(OVERWORLD_CAMERA_Y < halfHeight) {
+    y = 0;
+  } else {
+    y = (OVERWORLD_CAMERA_Y - halfHeight) / (CHUNK_HEIGHT*TILE_WIDTH_HEIGHT);
+  }
+
+  chunkMapSetPosition(x, y);
+}