; --------------------------------------------------------------
; UPDATE SAT BUFFER
; Generate vpos, hpos and cc data for the sprites that make up
; each of the cars (player and Ash).

; Generate sat buffer data from player's x,y coordinates.

upbuf  ld a,(ply)          ; load player's current y-coordinate.
       ld hl,plrvp         ; point to sat buffer.
       call cary           ; refresh buffer according to y.

       ld a,(plx)          ; load player's current x-coordinate.
       ld hl,plrhp         ; point to sat buffer.
       call carx           ; refresh buffer according to x.

; Generate sat buffer data from Ash's x,y coordinates.

       ld a,(ashy)         ; load Ash's current y-coordinate.
       ld hl,ashvp         ; point to sat buffer.
       call cary           ; refresh buffer according to y.

       ld a,(ashx)         ; load Ash's current x-coordinate.
       ld hl,ashhp         ; point to sat buffer.
       call carx           ; refresh buffer according to x.

       ret