Routines
Prev: A817 Up: Map Next: A86E
A83F: Write Sprite Buffer
Used by the routine at DrawRoom.
Writes a sprite into the room buffer, starting from sprite ID A with width E and height D. Clone of WriteGameSpriteBuffer.
Input
A Starting sprite ID
B Vertical position
C Horizontal position
D Height
E Width
WriteSpriteBuffer A83F PUSH AF Stash the registers this tile walk uses.
A840 PUSH BC
A841 PUSH DE
A842 PUSH HL
A843 DEC A Start one ID before the first tile so the increment lands on it.
A844 LD ($BAA2),A Write the tile ID to *DrawSpriteID.
A847 LD A,E Remember the remaining width in *DrawSpriteWidth.
A848 LD ($BAA3),A
WriteSpriteBuffer_NextRow A84B LD A,($BAA3) Reload the remaining width.
A84E LD E,A
A84F PUSH BC Stash the position and size.
A850 PUSH DE
A851 CALL ConvertDrawCoordinate Convert this tile into a room-buffer offset.
A854 POP DE Restore the position and size.
A855 POP BC
WriteSpriteBuffer_NextTile A856 LD A,($BAA2) Advance *DrawSpriteID to the next tile ID.
A859 INC A
A85A LD ($BAA2),A
A85D CALL PopulateRoomBuffer Write that tile into the room buffer.
A860 DEC E Move one column across.
A861 JR NZ,WriteSpriteBuffer_NextTile Jump to WriteSpriteBuffer_NextTile until this row is complete.
A863 DEC D Move on to the next row of tiles.
A864 JR Z,WriteSpriteBuffer_Done Jump to WriteSpriteBuffer_Done if every row is written.
A866 DEC B Move one row up.
A867 JR WriteSpriteBuffer_NextRow Jump to WriteSpriteBuffer_NextRow.
WriteSpriteBuffer_Done A869 POP HL Restore HL, DE, BC and AF from the stack.
A86A POP DE
A86B POP BC
A86C POP AF
A86D RET Return.
Prev: A817 Up: Map Next: A86E