Update chunk rendering, improve chunk loading

- On world_init, LOAD_CHUNK amount of chunks are preloaded
- Chunks are loaded around the player's current chunk, in a square
  shape. The size of the shape is controlled by CHUNK_DISTANCE
- Allow chunks struct to be independent of a position. We load a chunk
  TO a position in the world chunk grid (x, y). This allows us to "wrap"
  chunks, so we have an endless world, but we are really just wrapping
  around

1 files changed, 10 insertions, 1 deletions

diff --git a/src/engine.h b/src/engine.h
index 2eb7518..0633bcc 100644
--- a/src/engine.h
+++ b/src/engine.h
@@ -2,12 +2,21 @@
 #include "window.h"
 #include "shader.h"
 #include "junk/vector.h"
+// CHUNK_DISTANCE is essentially render distance, it shows you how many chunks
+// around the user you can see
+// The number of loaded chunks can be determined as follows:
+// We want a square around curr_chunk, and a side of the square will be 1
+// (center chunk) + 2 * CHUNK_DISTANCE (either side of center)
+// loaded chunks = (1 + CHUNK_DISTANCE * 2)^2
+#define CHUNK_DISTANCE 5
+
 struct engine {
     struct window* window;
     struct shader* shader;
-    struct vector* objects;
     struct camera* camera;
     int game_loop;
+    int curr_chunk[2];
+    struct world* world;
 };
 
 /**