可变地修改了，但是出错了，怎么办？

TILES_X

TILES_Y

TILES_TOTAL

    /* How many points should be in each tile? */
    /* NOTE: MUST BE POWER OF TWO */
    #define TILE_WIDTH 32
    #define TILE_HEIGHT TILE_WIDTH
    #define TILE_AREA ( TILE_WIDTH * TILE_HEIGHT )

    /* How far should the origin of each tile be spaced? */
    #define TILE_OFFSET_X TILE_WIDTH
    #define TILE_OFFSET_Y ( TILE_HEIGHT * 0.866f )

    /* Relative to the origin, where does the tile really end? */
    #define TILE_MIN_X 0.0f
    #define TILE_MIN_Y 0.0f
    #define TILE_MAX_X ( TILE_OFFSET_X + 0.5f )
    #define TILE_MAX_Y ( TILE_OFFSET_Y + 0.5f )

    /* How many tiles should be cached offscreen? */
    #define TILE_BLEED 2

    #define CAMERA_WIDTH 256.0f
    #define CAMERA_HEIGHT 192.0f

    #define TILES_X ( ( size_t ) ( ( float ) ( ( CAMERA_WIDTH * 2.0f ) + ( TILE_BLEED * ( TILE_WIDTH + TILE_WIDTH ) ) ) / ( float ) TILE_OFFSET_X ) )
    #define TILES_Y ( ( size_t ) ( ( float ) ( ( CAMERA_HEIGHT * 2.0f ) + ( TILE_BLEED * ( TILE_HEIGHT + TILE_HEIGHT ) ) ) / ( float ) TILE_OFFSET_Y ) )
    #define TILES_TOTAL ( TILES_X * TILES_Y )

TILES_X expands to:
    ( ( size_t ) ( ( float ) ( ( 256.0f * 2.0f ) + ( 2 * ( 32 + 32 ) ) ) / ( float ) 32 ) )