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Routines |
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Used by the routine at RunFrame.
Updates the four shots in the slots at ShotSlots. A shot with bit 7 of offset 22 set and a type of zero is a chasing shot, which is dealt with by UpdateChasingObject. The others are shots in use when offset 11 is not zero, and are dealt with by UpdateShot.
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| UpdateShots | 46854 | LD IX,45946 | The shot slots. | |
| 46858 | LD B,4 | B=4. | ||
| UpdateShots_Loop | 46860 | PUSH BC | Stash BC on the stack. | |
| 46861 | PUSH IX | Stash IX on the stack. | ||
| 46863 | BIT 7,(IX+22) | Jump to UpdateShots_Shot if bit 7 of offset 22 of IX is clear. | ||
| 46867 | JR Z,UpdateShots_Shot | |||
| 46869 | LD A,(IX+0) | Read offset 0 of IX. | ||
| 46872 | AND A | Call UpdateChasingObject if A is zero. | ||
| 46873 | CALL Z,UpdateChasingObject | |||
| 46876 | JR UpdateShots_Next | Jump to UpdateShots_Next. | ||
| UpdateShots_Shot | 46878 | LD A,(IX+11) | Read offset 11 of IX. | |
| 46881 | AND A | Call UpdateShot if A is not zero. | ||
| 46882 | CALL NZ,UpdateShot | |||
| UpdateShots_Next | 46885 | POP IX | Bring IX back off the stack. | |
| 46887 | LD BC,24 | BC=24. | ||
| 46890 | ADD IX,BC | IX gains BC. | ||
| 46892 | POP BC | Bring BC back off the stack. | ||
| 46893 | DJNZ UpdateShots_Loop | Decrease B and jump to UpdateShots_Loop until none remain. | ||
| 46895 | RET | Return. | ||
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