Avalon: Routine at 49808

49808: Set up room floor-wall connector graphics

Used by the routine at 49765.
49808	LD A,1	Graphics type = 1 (fixed scenery item)
49810	LD (60227),A	Graphics type = 1 (fixed scenery item)
49813	LD A,17	Graphic number - address pointer offset for graphic address table at 38851 - unnecessary because it'll be overwritten in a few more instructions at 49845
49815	LD (60240),A
49818	LD A,(60280)	Room graphic item's horizontal position within current room, in half-character (4 pixel) steps. Copy into data buffer.
49821	LD (60232),A
49824	LD A,(60281)	Room graphic item's vertical position within current room, in pixels. Copy into data buffer.
49827	LD (60234),A
Sets up (including mirroring if needed) wall/floor connector graphics, depending on which wall is being dealt with (left, right or back) Uses the byte at 60287 to identify the graphics address offset (C register) and frame (A register) for the wall/floor connector graphic address: Back wall (byte value = 0) Right wall (byte value = 1) Left wall (byte value = 2)
49830	LD A,(60287)
49833	CP 0	Back wall - offset for graphics address 38879, back wall floor section (see 40392)
49835	JR Z,49841
49837	LD C,16	Right/left wall - offset for: address pointer = 38881, right wall side/wall floor section (see 40423), or address pointer = 38883, left wall (mirrored) side wall/floor section (see 32851)
49839	JR 49845
49841	LD C,15
49843	LD A,1
49845	LD (60240),A
Calculate graphics offset based on level offset and the above
49848	LD A,(60279)	Level type offset to scenery graphics (either 0 or 12 depending on whether it's a 'brick' or 'cavern' style level)
49851	ADD A,C	Add to calculated value to indicate the correct graphic number based on level type and wall alignment
49852	CALL 57538	Set up graphics (copy graphics address pointers and mirror any graphic data)
49855	CALL 57520	Copy the item data from the working buffer 60227 into a 16 byte room item data set at 31744.