Multi-pool texture memory management

(0,4) (1,4) (2,4) (3,4) (4,4) (5,4) (6,4) (7,4 > (8,4) (9,4)

(0,3) (1,3) (2,3) (3,3) (4,3) (5,3) (6,3) (7,3) (8,3) (9,3)

(0,2) (1,2) (2,2) (3,2) (4,2) (5,2 ) (6,2) (7,2) (8,2) (9,1}