Day 33 complete.

handmade.h

@@ -136,42 +136,40 @@ void UpdateAndRender(thread_context *Thread, game_memory *Memory,
  *
  */
 
-typedef struct cannonical_position {
-#if 1
-    S32 TileMapX;
-    S32 TileMapY;
+typedef struct tile_chunk_position {
+    U32 TileChunkX;
+    U32 TileChunkY;
 
-    S32 TileX;
-    S32 TileY;
-#else
-    U32 _TileX;
-    U32 _TileY;
-#endif
+    U32 RelTileX;
+    U32 RelTileY;
+} tile_chunk_position;
+
+typedef struct cannonical_position {
+    U32 AbsTileX;
+    U32 AbsTileY;
 
     /* NOTE: Tile-relative X and Y. */
     F32 TileRelX;
     F32 TileRelY;
 } cannonical_position;
 
-typedef struct tile_map {
+typedef struct tile_chunk {
     U32 *Tiles;
-} tile_map;
+} tile_chunk;
 
 typedef struct world {
+    U32 ChunkShift;
+    U32 ChunkMask;
+    U32 ChunkDim;
+
     F32 TileSideInMeters;
     S32 TileSideInPixels;
     F32 MetersToPixels;
 
-    S32 CountX;
-    S32 CountY;
+    S32 TileChunkCountX;
+    S32 TileChunkCountY;
 
-    F32 UpperLeftX;
-    F32 UpperLeftY;
-
-    S32 TileMapCountX;
-    S32 TileMapCountY;
-
-    tile_map *TileMaps;
+    tile_chunk *TileChunks;
 } world;
 
 typedef struct game_state {