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Routines |
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This uses the current room index and the night-time flag to decide which screen attributes should be used for the game window. Additionally, when in non-illuminated tunnel rooms it will wipe the visible tiles to obscure the tunnel's route.
Used by the routines at pick_up_item, drop_item, event_another_day_dawns, zoombox, action_shovel and searchlight_mask_test.
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| choose_game_window_attributes | AB6B | LD A,($68A0) | If the global current room index is room_28_HUT1LEFT or below... | |||||
| AB6E | CP $1D | |||||||
| AB70 | JR NC,choose_attribute_tunnel | |||||||
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The hero is outside, or in a room, but not in a tunnel.
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| AB72 | LD A,($A146) | Read the night-time flag | ||||||
| AB75 | LD C,$07 | Default attribute is attribute_WHITE_OVER_BLACK | ||||||
| AB77 | AND A | Is it night-time? | ||||||
| AB78 | JR Z,set_attribute_from_C | Jump if not | ||||||
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Consider night-time colours.
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| AB7A | LD A,($68A0) | Read the global current room index | ||||||
| AB7D | LD C,$41 | For outside at night we use attribute_BRIGHT_BLUE_OVER_BLACK | ||||||
| AB7F | AND A | Are we outside? | ||||||
| AB80 | JR Z,set_attribute_from_C | Jump if so | ||||||
| AB82 | LD C,$05 | Otherwise for inside at night we use attribute_CYAN_OVER_BLACK | ||||||
| set_attribute_from_C | AB84 | LD A,C | Copy | |||||
| set_attribute_from_A | AB85 | LD ($AB6A),A | Assign game_window_attribute | |||||
| AB88 | RET | Return | ||||||
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The hero is in a tunnel.
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| choose_attribute_tunnel | AB89 | LD C,$02 | For an illuminated tunnel we use attribute_RED_OVER_BLACK | |||||
| AB8B | LD HL,($8215) | Load HL with items_held | ||||||
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If the hero holds a torch - illuminate the room.
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| AB8E | LD A,$04 | Load item_TORCH into A | ||||||
| AB90 | CP L | Item is torch? | ||||||
| AB91 | JR Z,set_attribute_from_C | Jump if so | ||||||
| AB93 | CP H | Item is torch? | ||||||
| AB94 | JR Z,set_attribute_from_C | Jump if so | ||||||
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The hero holds no torch - wipe the tiles so that nothing gets drawn.
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| AB96 | CALL wipe_visible_tiles | Wipe the visible tiles array | ||||||
| AB99 | CALL plot_interior_tiles | Render visible tiles array into the screen buffer | ||||||
| AB9C | LD A,$01 | For a dark tunnel we use attribute_BLUE_OVER_BLACK | ||||||
| AB9E | JR set_attribute_from_A | Jump to set_attribute_from_A | ||||||
| Prev: AB6A | Up: Map | Next: ABA0 |