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Routines |
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Used by the routines at TestObjectIntersections, BlockMovementInX, BlockMovementInY and BlockMovementInZ.
Tests whether collision tests should take any notice of an object. The zero flag is set if the slot is unused or bit 1 of the flags is set.
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Return if the slot is empty.
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| TestObjectSolid | B74D | LD A,(IY+$00) | Fetch the sprite number of the object. | |||||||||
| B750 | AND A | Return if the slot is not used. | ||||||||||
| B751 | RET Z | |||||||||||
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After invert, bit 1 is set when the object is not ignored.
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| B752 | LD A,(IY+$07) | Fetch the flags of the object. | ||||||||||
| B755 | CPL | Invert them. | ||||||||||
| B756 | AND %00000010 | Keep only bit 1. | ||||||||||
| B758 | RET | Return. | ||||||||||
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View the equivalent code in;
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| Prev: B712 | Up: Map | Next: B759 |