|
Routines |
| Prev: 86A1 | Up: Map | Next: 8733 |
|
Load the actor's cached (old) sprite, work out the new sprite position, and XOR both onto the screen through XORSpriteLoop.
|
||||||||||
Load the cached sprite, then XOR it onto the screen.
|
||||||||||
| DrawSprite | 8701 | CALL LoadSpriteScratch | Call LoadSpriteScratch. | |||||||
| 8704 | EXX | Switch to the shadow registers. | ||||||||
| 8705 | CALL PositionSprite | Call PositionSprite. | ||||||||
| 8708 | EXX | Switch back to the normal registers. | ||||||||
|
Compare the cached Y position with the actor Y.
|
||||||||||
| 8709 | LD A,($5E56) | Subtract the actor Y from SpriteCachedY. | ||||||||
| 870C | SUB (IX+$04) | |||||||||
| 870F | JP Z,XORSpriteLoop_Write | Jump to XORSpriteLoop_Write if they match. | ||||||||
| 8712 | JP M,DrawSprite_ActorMovedDown | Jump to DrawSprite_ActorMovedDown if the actor has moved down (the result is negative). | ||||||||
| 8715 | LD C,A | Store the row difference in the row counter. | ||||||||
| 8716 | LD A,($5E5A) | Jump to XORSpriteLoop_Write if the difference is taller than the old sprite's rows in SpriteCachedRows. | ||||||||
| 8719 | CP C | |||||||||
| 871A | JP C,XORSpriteLoop_Write | |||||||||
| 871D | SUB C | Subtract it from SpriteCachedRows and jump to XORSpriteLoop. | ||||||||
| 871E | LD ($5E5A),A | |||||||||
| 8721 | JP XORSpriteLoop | |||||||||
| DrawSprite_ActorMovedDown | 8724 | EXX | Switch register sets and negate the row difference. | |||||||
| 8725 | NEG | |||||||||
| 8727 | LD C,A | |||||||||
| 8728 | LD A,($5E59) | Jump to XORSpriteLoop_FinishSprite if the difference is taller than the new sprite's rows in SpriteRowsLeft. | ||||||||
| 872B | CP C | |||||||||
| 872C | JP C,XORSpriteLoop_FinishSprite | |||||||||
| 872F | SUB C | Subtract it from the row count and jump to XORSpriteLoop_NextPair. | ||||||||
| 8730 | JP XORSpriteLoop_NextPair | |||||||||
| Prev: 86A1 | Up: Map | Next: 8733 |
