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Routines |
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Used by the routine at GameStart.
Walk entities marked as falling, apply gravity to their Y fields and clear the fall latch when they land.
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| Process_Falling_Entities | 45481 | LD HL,29363 | Point HL at the game event flags (GameEventFlags). | |
| 45484 | BIT 2,(HL) | Is the falling-entity latch (bit 2 of GameEventFlags. set at 45571) set? If not, return. | ||
| 45486 | RET Z | |||
| 45487 | RES 2,(HL) | Clear the falling-entity latch (bit 2 of GameEventFlags). | ||
| 45489 | LD DE,14 | Each entity record is 0014 bytes long, then load that length into DE. | ||
| 45492 | LD IX,35689 | Point IX at the simple entity table (StateData_SimpleEntities). | ||
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Scan for falling entities and advance each marked one up to three steps before clearing the latch.
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| Process_Falling_Entities_Scan | 45496 | LD A,(IX+0) | Fetch the current entity's type for the type test. | |
| 45499 | CP 255 | Is the current entity's entity type equal to 255? If so, return. | ||
| 45501 | RET Z | |||
| 45502 | BIT 0,(IX+2) | Is bit 0 of the current entity's flags byte 2 set? If not, jump to Process_Falling_Entities_NextEntity. | ||
| 45506 | JR Z,Process_Falling_Entities_NextEntity | |||
| 45508 | CALL Advance_Falling_Entity | Call Advance_Falling_Entity to advance Falling Entity? If not, jump to Process_Falling_Entities_ClearFallBits. | ||
| 45511 | JR NC,Process_Falling_Entities_ClearFallBits | |||
| 45513 | CALL Advance_Falling_Entity | Call Advance_Falling_Entity again to advance Falling Entity? If not, jump to Process_Falling_Entities_ClearFallBits. | ||
| 45516 | JR NC,Process_Falling_Entities_ClearFallBits | |||
| 45518 | CALL Advance_Falling_Entity | Call Advance_Falling_Entity a third time to advance Falling Entity? If not, jump to Process_Falling_Entities_ClearFallBits. | ||
| 45521 | JR NC,Process_Falling_Entities_ClearFallBits | |||
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Advance to the next entity in the falling-entity walk.
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| Process_Falling_Entities_NextEntity | 45523 | ADD IX,DE | Advance IX to the next entity record. | |
| 45525 | JR Process_Falling_Entities_Scan | Jump to Process_Falling_Entities_Scan to advance to the next falling entity. | ||
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This entry point is used by the routine at Advance_Falling_Entity.
Clear the falling flag, set the landed flag, raise a room/script event, and continue the scan.
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| Process_Falling_Entities_ClearFallBits | 45527 | RES 0,(IX+2) | Reset bit 0 of the current entity's flags byte 2. | |
| 45531 | SET 7,(IX+1) | Set bit 7 of the current entity's flags byte 1. | ||
| 45535 | SET 0,(HL) | Set "room / script event raised" (bit 0 of GameEventFlags). | ||
| 45537 | JR Process_Falling_Entities_NextEntity | Jump to Process_Falling_Entities_NextEntity to skip this falling entity. | ||
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