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Routines |
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Used by the routine at handle_pickup_drop.
Tests IX against all 40 records with the per-axis tests at do_objs_intersect_on_x, do_objs_intersect_on_y and do_objs_intersect_on_z, with no offset on any axis. Empty slots are skipped, and so is any object with bit 1 of byte 7 set -- which is how IX avoids finding itself: it sets its own bit 1 for the duration. Only handle_pickup_drop uses it, to see whether there is room above Sabreman's head for a dropped object.
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| do_any_objs_intersect | B4FD | PUSH BC | save the registers; IY walks all 40 records | |||||||
| B4FE | PUSH DE | |||||||||
| B4FF | PUSH HL | |||||||||
| B500 | PUSH IY | |||||||||
| B502 | LD IY,$5C08 | |||||||||
| B506 | LD B,$28 | |||||||||
| B508 | LD C,$00 | no offset on X, Y or Z; and IX out of its own way | ||||||||
| B50A | LD L,C | |||||||||
| B50B | LD H,C | |||||||||
| B50C | SET 1,(IX+$07) | |||||||||
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The exit clears IX's bit 1 unconditionally, so an object that had the bit set before the call loses it. The only caller passes Sabreman's legs, which do not normally carry it.
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