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Routines |
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Load the actor's cached (old) sprite, work out the new sprite position, and XOR both onto the screen through XORSpriteLoop.
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Load the cached sprite, then XOR it onto the screen.
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| DrawSprite | 34561 | CALL LoadSpriteScratch | Call LoadSpriteScratch. | |||||||
| 34564 | EXX | Switch to the shadow registers. | ||||||||
| 34565 | CALL PositionSprite | Call PositionSprite. | ||||||||
| 34568 | EXX | Switch back to the normal registers. | ||||||||
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Compare the cached Y position with the actor Y.
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| 34569 | LD A,(24150) | Subtract the actor Y from SpriteCachedY. | ||||||||
| 34572 | SUB (IX+4) | |||||||||
| 34575 | JP Z,XORSpriteLoop_Write | Jump to XORSpriteLoop_Write if they match. | ||||||||
| 34578 | JP M,DrawSprite_ActorMovedDown | Jump to DrawSprite_ActorMovedDown if the actor has moved down (the result is negative). | ||||||||
| 34581 | LD C,A | Store the row difference in the row counter. | ||||||||
| 34582 | LD A,(24154) | Jump to XORSpriteLoop_Write if the difference is taller than the old sprite's rows in SpriteCachedRows. | ||||||||
| 34585 | CP C | |||||||||
| 34586 | JP C,XORSpriteLoop_Write | |||||||||
| 34589 | SUB C | Subtract it from SpriteCachedRows and jump to XORSpriteLoop. | ||||||||
| 34590 | LD (24154),A | |||||||||
| 34593 | JP XORSpriteLoop | |||||||||
| DrawSprite_ActorMovedDown | 34596 | EXX | Switch register sets and negate the row difference. | |||||||
| 34597 | NEG | |||||||||
| 34599 | LD C,A | |||||||||
| 34600 | LD A,(24153) | Jump to XORSpriteLoop_FinishSprite if the difference is taller than the new sprite's rows in SpriteRowsLeft. | ||||||||
| 34603 | CP C | |||||||||
| 34604 | JP C,XORSpriteLoop_FinishSprite | |||||||||
| 34607 | SUB C | Subtract it from the row count and jump to XORSpriteLoop_NextPair. | ||||||||
| 34608 | JP XORSpriteLoop_NextPair | |||||||||
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