Routines
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41543: Select Draw Sprite
Used by the routines at PrepareDraw and UpdateStarLayer.
Sets up the second sprite, which is the sprite that is drawn by DrawSprites.
Input
B Number of rows
C Index of the routine that draws the sprite
H Width in bytes
Output
B High byte of the shift table to use
IX Address of the routine that draws the sprite
SelectDrawSprite 41543 LD A,B Fetch the number of rows.
41544 LD (41432),A Store it.
41547 LD A,H Fetch the width.
41548 LD (23593),A Store it.
41551 LD HL,41642 Use the table of routines that draw sprites.
41554 CALL GetTableEntry Fetch the address of the routine.
41557 PUSH HL Put it in IX.
41558 POP IX
41560 LD A,(41429) Fetch the horizontal position of the second sprite.
41563 JR SelectEraseSprite_Shift Jump to SelectEraseSprite_Shift.
This entry point is used by the routine at SelectEraseSprite.
SelectEraseSprite_Position 41565 LD A,(41427) Fetch the horizontal position of the first sprite.
SelectEraseSprite_Shift 41568 AND %00000110 Only bits 1 and 2, which are the number of pixels to shift by.
41570 ADD A,248 Add the high byte of the shift table that does no shifting.
41572 LD B,A Store it in B.
41573 RET Return.
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