Код:
SPRXCO DB 4
SPRYCO DB 0
SPRXLEN DB 3
SPRYLEN DB 48
SPRITESRC EQU #9B00
DRAWSPRITE
;check if sprite should be displayed without shifting
LD A,(SPRXCO)
AND 7
JP Z,DRAWNOX
;--------------------------------------------------
;---------------INITIALISATION---------------------
;--------------------------------------------------
ADD A,#B0
LD (RIGHTSIDE1+1),A
LD (RIGHTSIDE2+1),A
LD (RIGHTSIDE3+1),A
LD (RIGHTSIDE4+1),A
ADD A,8
LD (LEFTSIDE1+1),A
LD (LEFTSIDE2+1),A
LD (LEFTSIDE3+1),A
LD (LEFTSIDE4+1),A
LD BC,(SPRADR) ;BC = destination address on screen
LD DE,SPRITESRC ;DE = source address in memory
LD A,(SPRYLEN)
LD IXL,A ;ixl = sprite's height
LD A,(SPRXLEN)
DEC A
LD (DRAWSPRITEITELINE+2), A ;HARDCODED SPRITE'S WIDTH
;----------------------------------------------
;---------------MAIN CYCLE---------------------
;----------------------------------------------
DRAWSPRITEITELINE
LD IXH,0 ;ixh = sprite's width, HERE GOES A HARDCODE FROM INIT
PUSH BC
;-------START DRAWING RIGHT SIDE OF LEFT BYTE--------
LD A,(DE) ;READ COPY BYTE OF MASK FOR NEXT SCREEN BYTE
EX AF,AF'
LD A,(DE) ;READ BYTE OF MASK
RIGHTSIDE1
LD H,00
LD L,A ;HL = BYTE ADDRESS IN RIGHTSIDE PRESHIFTED TABLE
LD A,(BC) ;READ BYTE FROM SCREEN
OR (HL)
XOR (HL) ;APPLY PRESHIFTED MASK FROM TABLE
LD H,A ;SAVE TEMPORARY RESULT IN H
INC DE
LD A,(DE) ;READ BYTE OF SPRITE
LD L,A
LD A,H
RIGHTSIDE2
LD H,00 ;HL = BYTE ADDRESS IN RIGHTSIDE PRESHIFTED TABLE
OR (HL) ;APPLY PRESHIFTED SPRITE FROM TABLE
LD (BC),A ;LEFT HALFBYTE OF LEFT SIDE OF SPRITE IS DONE, PLACE IT BACK ON SCREEN
INC BC
;-------START DRAWING LEFT SIDE OF CENTER BYTE--------
DRAWSPRITEITECENTER
LD A,L ;SAVE LEFT SPRITE BYTE IN A
EX AF,AF' ;A = SAVED LEFT BYTE OF MASK
LEFTSIDE1
LD H,00
LD L,A ;HL = BYTE ADDRESS IN LEFTSIDE PRESHIFTED TABLE
LD A,(BC) ;READ FROM SCREEN
OR (HL)
XOR (HL) ;APPLY LEFT MASK BYTE FROM TABLE
LD H,A ;SAVE TEMPORARY RESULT IN H
EX AF,AF' ;A = SAVED LEFT BYTE OF SPRITE
LD L,A
LD A,H ;RESTORE TEMPORARY RESULT
LEFTSIDE2
LD H,00 ;HL = BYTE ADDRESS IN LEFTSIDE PRESHIFTED TABLE
OR (HL) ;APPLY LEFT SPRITE BYTE FROM TABLE
LD H,A ;SAVE TEMPORARY RESULT (READY LEFT SIDE OF ONSCREEN BYTE) IN H
INC DE
;-------START DRAWING RIGHT SIDE OF CENTER BYTE--------
LD A,(DE) ;READ COPY BYTE OF MASK FOR NEXT SCREEN BYTE
EX AF,AF'
LD A,(DE) ;READ BYTE OF MASK
LD L,A
LD A,H ;RESTORE TEMPORARY RESULT FROM H
RIGHTSIDE3
LD H,00 ;HL = BYTE ADDRESS IN RIGHTSIDE PRESHIFTED TABLE
OR (HL)
XOR (HL) ;APPLY PRESHIFTED MASK FROM TABLE
LD H,A ;SAVE TEMPORARY RESULT IN H
INC DE
LD A,(DE) ;READ BYTE OF SPRITE
LD L,A
LD A,H
RIGHTSIDE4
LD H,00 ;HL = BYTE ADDRESS IN RIGHTSIDE PRESHIFTED TABLE
OR (HL) ;APPLY PRESHIFTED SPRITE FROM TABLE
LD (BC),A ;LEFT HALFBYTE OF LEFT SIDE OF SPRITE IS DONE, PLACE IT BACK ON SCREEN
INC BC
DEC IXH
JR NZ,DRAWSPRITEITECENTER
;-------START DRAWING LEFT SIDE OF RIGHT BYTE--------
LD A,L ;SAVE LEFT SPRITE BYTE IN A
EX AF,AF' ;A = SAVED LEFT BYTE OF MASK
LEFTSIDE3
LD H,00
LD L,A ;HL = BYTE ADDRESS IN LEFTSIDE PRESHIFTED TABLE
LD A,(BC) ;READ FROM SCREEN
OR (HL)
XOR (HL) ;APPLY LEFT MASK BYTE FROM TABLE
LD H,A ;SAVE TEMPORARY RESULT IN H
EX AF,AF' ;A = SAVED LEFT BYTE OF SPRITE
LD L,A
LD A,H ;RESTORE TEMPORARY RESULT
LEFTSIDE4
LD H,00 ;HL = BYTE ADDRESS IN LEFTSIDE PRESHIFTED TABLE
OR (HL) ;APPLY LEFT SPRITE BYTE FROM TABLE
LD (BC),A
INC DE
POP BC
DEC IXL
RET Z
INC B
LD A,B
AND 7
JR NZ,DRAWSPRITEITELINE
LD A,C
ADD A,32
LD C,A
JR C,DRAWSPRITEITELINE
LD A,B
SUB 8
LD B,A
JR DRAWSPRITEITELINE
Помощь с оптимизацией кода
Ответить с цитированием
Размещение рекламы на форуме способствует его дальнейшему развитию 
