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Routines |
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Used by the routines at UpdatePickupEntity and UpdateShotEntity.
Decreases the counter in the high nibble of field 22 of an entity by one. When the counter reaches zero the entity is freed and hidden.
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| DecreaseEntityCounter | 40414 | LD A,(IX+22) | Read field 22 of the entity. | |||||
| 40417 | AND %11110000 | Keep the counter. | ||||||
| 40419 | RET Z | Return if it is zero. | ||||||
| 40420 | LD A,(IX+22) | Read field 22 of the entity. | ||||||
| 40423 | SUB 16 | Subtract one from the counter. | ||||||
| 40425 | LD (IX+22),A | Store it. | ||||||
| 40428 | AND %11110000 | Keep the counter. | ||||||
| 40430 | RET NZ | Return if it is not zero. | ||||||
| 40431 | LD (IX+0),0 | Set the type of the entity to 0 to free it. | ||||||
| 40435 | SET 7,(IX+1) | Set bit 7 of the frame of the entity, to hide it. | ||||||
| 40439 | RET | Return. | ||||||
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