Routines
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43071: 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 43071 PUSH AF Stash the registers this tile walk uses.
43072 PUSH BC
43073 PUSH DE
43074 PUSH HL
43075 DEC A Start one ID before the first tile so the increment lands on it.
43076 LD (47778),A Write the tile ID to *DrawSpriteID.
43079 LD A,E Remember the remaining width in *DrawSpriteWidth.
43080 LD (47779),A
WriteSpriteBuffer_NextRow 43083 LD A,(47779) Reload the remaining width.
43086 LD E,A
43087 PUSH BC Stash the position and size.
43088 PUSH DE
43089 CALL ConvertDrawCoordinate Convert this tile into a room-buffer offset.
43092 POP DE Restore the position and size.
43093 POP BC
WriteSpriteBuffer_NextTile 43094 LD A,(47778) Advance *DrawSpriteID to the next tile ID.
43097 INC A
43098 LD (47778),A
43101 CALL PopulateRoomBuffer Write that tile into the room buffer.
43104 DEC E Move one column across.
43105 JR NZ,WriteSpriteBuffer_NextTile Jump to WriteSpriteBuffer_NextTile until this row is complete.
43107 DEC D Move on to the next row of tiles.
43108 JR Z,WriteSpriteBuffer_Done Jump to WriteSpriteBuffer_Done if every row is written.
43110 DEC B Move one row up.
43111 JR WriteSpriteBuffer_NextRow Jump to WriteSpriteBuffer_NextRow.
WriteSpriteBuffer_Done 43113 POP HL Restore HL, DE, BC and AF from the stack.
43114 POP DE
43115 POP BC
43116 POP AF
43117 RET Return.
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