|
Routines |
| Prev: A2CF | Up: Map | Next: A30A |
|
Write 00 over the cached sprite bytes (*IX+09 to *IX+0F) of each of the 18 actor slots, so that every actor is redrawn from scratch and no stale image is XORed off the redrawn screen. Bytes 00-08 are the actor itself and bytes 10-17 are state specific to its type, so they are left alone.
|
||||
|
Start at byte 09 of the first slot, 6009.
|
||||
| ClearSpriteCaches | A2F5 | LD HL,$6009 | HL=6009. | |
| A2F8 | LD BC,$0718 | Set B to 07 cache bytes per slot and C to 18 slots. | ||
| A2FB | LD DE,$0011 | DE=0011. | ||
|
Clear the seven cache bytes of each slot in turn.
|
||||
| ClearSpriteCaches_Loop | A2FE | PUSH BC | Stash BC on the stack. | |
| ClearSpriteCaches_WriteByte | A2FF | LD (HL),$00 | Write 00 to the current cache byte. | |
| A301 | INC HL | Move onto the next cache byte. | ||
| A302 | DJNZ ClearSpriteCaches_WriteByte | Decrease the inner counter by one and loop back to ClearSpriteCaches_WriteByte until this slot is clear. | ||
| A304 | ADD HL,DE | Skip the rest of the slot. | ||
| A305 | POP BC | Restore BC from the stack. | ||
| A306 | DEC C | Decrease C by one. | ||
| A307 | JR NZ,ClearSpriteCaches_Loop | Jump back to ClearSpriteCaches_Loop until C is zero. | ||
| A309 | RET | Return. | ||
| Prev: A2CF | Up: Map | Next: A30A |