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Routines |
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Used by the routines at TransitionRoomRight, TransitionRoomLeft, Start_Level, MainMenu and Handle_Level_Complete.
Fetch the current room number and set up the default tile and attribute data pointers.
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| PopulateRoomBuffer | 5E24 | LD A,($5FC5) | Load A with *CurrentRoom. | |
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Initialise the room pointer/ default tile set.
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| 5E27 | LD HL,$83A9 | Write Room01 to *PointerRoomData. | ||
| 5E2A | LD ($5FC3),HL | |||
| 5E2D | LD HL,$9BAA | Write TileSet_Default to *PointerActiveTileSet. | ||
| 5E30 | LD ($5FC1),HL | |||
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If this is not room 00 look up the correct room data pointer.
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| 5E33 | OR A | Call FindRoomData if this is not room 00. | ||
| 5E34 | CALL NZ,FindRoomData | |||
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Clear the screen buffer at RoomBuffer.
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| 5E37 | LD HL,$C000 | Clear 17FF bytes from RoomBuffer onwards. | ||
| 5E3A | LD DE,$C001 | |||
| 5E3D | LD (HL),$00 | |||
| 5E3F | LD BC,$17FF | |||
| 5E42 | LDIR | |||
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Initialise drawing state variables.
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| 5E44 | LD A,$FF | Write FF to *RespawnFlag. | ||
| 5E46 | LD ($5FBB),A | |||
| 5E49 | LD HL,$00FF | Write 00FF to *RoomDrawPosition. | ||
| 5E4C | LD ($5FB9),HL | |||
| 5E4F | LD DE,$02C1 | DE=02C1. | ||
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The main room data parsing loop. Reads a command byte from the room data and dispatches to the appropriate handler based on its value.
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| 5E52 | LD HL,($5FC3) | Fetch the *PointerRoomData and store it in HL. | ||
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This entry point is used by the routines at Command04_SwitchTileSet, Command01_SkipTiles, Command02_RepeatedTile and Command08Plus_SingleTile.
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| PopulateRoomBuffer_ParseByte | 5E55 | LD A,(HL) | Fetch the room data byte from the pointer. | |
| 5E56 | OR A | Jump to Command00_Skip if the room data byte is 00. | ||
| 5E57 | JR Z,Command00_Skip | |||
| 5E59 | CP $01 | Jump to Command01_SkipTiles if the room data byte is 01. | ||
| 5E5B | JR Z,Command01_SkipTiles | |||
| 5E5D | CP $02 | Jump to Command02_RepeatedTile if the room data byte is 02. | ||
| 5E5F | JR Z,Command02_RepeatedTile | |||
| 5E61 | CP $03 | Jump to Command03_FillAttributes if the room data byte is 03. | ||
| 5E63 | JR Z,Command03_FillAttributes | |||
| 5E65 | CP $04 | Jump to Command04_SwitchTileSet if the room data byte is 04. | ||
| 5E67 | JR Z,Command04_SwitchTileSet | |||
| 5E69 | CP $08 | Jump to Command08Plus_SingleTile if the room data byte is 08 or higher. | ||
| 5E6B | JR NC,Command08Plus_SingleTile | |||
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This entry point is used by the routines at Command01_SkipTiles, Command02_RepeatedTile, Command08Plus_SingleTile and Command03_FillAttributes.
If none of the above matched, trigger an error (with an arbitrary error code).
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| PopulateRoomBuffer_Error | 5E6D | RST $08 | Run the ERROR_1 routine: RST 08. | |
| 5E6E | DEFB $04 | Error code: 04 ("Out of memory"). | ||
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Command 00: no-op. Skip this byte and continue parsing.
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| Command00_Skip | 5E6F | INC HL | Increment the room data pointer by one. | |
| 5E70 | JR PopulateRoomBuffer_ParseByte | Jump to PopulateRoomBuffer_ParseByte. | ||
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