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| − | [[Category:Z80 Routines:Graphic|largesprite]][[Category:Z80 Routines|largesprite]] | + | #REDIRECT [[Z80_Routines:Graphic:putLargeSprite]] |
| − | The '''Largesprite''' routine is used to copy the contents of a variable sized sprite to the Graph Buffer.
| + | |
| − | | + | |
| − | | + | |
| − | == Code ==
| + | |
| − | Here is Joe Wingbermuehle's version, which is the one used in ION. Gbuf must be defined before its use.
| + | |
| − | | + | |
| − | <nowiki>
| + | |
| − | ;=======================
| + | |
| − | ;LargeSprite
| + | |
| − | ;by Joe Wingbermuehle
| + | |
| − | ;=======================
| + | |
| − | ;Does: Copy a sprite to the gbuf
| + | |
| − | ;Input: ix=sprite address, a='x', l='y', b='height' (in pixels), c='width' (in bytes, e.g. 2 would be 16)
| + | |
| − | ;Output: The sprite is copied to the gbuf
| + | |
| − | ;-----------------------
| + | |
| − | largeSprite:
| + | |
| − | di ;turn interrupts off (we want to use shadow registers)
| + | |
| − | ex af,af'
| + | |
| − | ;exchange af with af' \
| + | |
| − | ld a,c ;ld c in a (a = 'width') | for not destroying a ('x')
| + | |
| − | push af ;push a |
| + | |
| − | ex af,af'
| + | |
| − | ;exchange back | and 'width' is now in a' (saved)
| + | |
| − | ld e,l ;e = 'y'
| + | |
| − | ld h,$00 ;h = 0
| + | |
| − | ld d,h ;d = 0
| + | |
| − | add hl,de ;'y' *2 \
| + | |
| − | add hl,de ; *3 | calculate 'y' *12 because 'y' is 'in rows'
| + | |
| − | add hl,hl ; *6 | (screen is 12 bytes in length)
| + | |
| − | add hl,hl ; *12 /
| + | |
| − | ld e,a ;e = 'x'
| + | |
| − | and $07 ;and %00000111
| + | |
| − | ld c,a ;last 3 bits in c (amount of bits to shift all bytes)
| + | |
| − | srl e ;e/2 | shifting e ('x') 3 bits to the right
| + | |
| − | srl e ; /4 | %11111111 becomes %00011111 for example
| + | |
| − | srl e ; /8 /
| + | |
| − | add hl,de ;hl = 'y'; de = 'x' (rounded) | add them
| + | |
| − | ld de, gbuf ;de = the adress of graph buffer
| + | |
| − | add hl,de ;add hl to the adress of the gbuf
| + | |
| − | largeSpriteLoop1:
| + | |
| − | push hl ;save adress
| + | |
| − | largeSpriteLoop2:
| + | |
| − | ld d,(ix) ;first sprite data in d
| + | |
| − | ld e,$00 ;e = 0
| + | |
| − | ld a,c ;a = c (to not destroy c)
| + | |
| − | or a ;is a = 0? (same as cp 0)
| + | |
| − | jr z,largeSpriteSkip1 ;if theres nothing to shift (a = 0) loop it
| + | |
| − | largeSpriteLoop3:
| + | |
| − | srl d ;shift one bit to the right; put the destroyed bit in the carry flag
| + | |
| − | rr e ;put the carry flag in e (%00000000 becomes %10000000 if carry flag = 1)
| + | |
| − | dec a ;decrease counter (with was 'the amount of bits to shift')
| + | |
| − | jr nz,largeSpriteLoop3 ;if the counter is not 0 loop back
| + | |
| − | largeSpriteSkip1:
| + | |
| − | ld a,(hl) ;graphbyte in a
| + | |
| − | xor d ;xor first byte of sprite (that can be changed to 'or d' if you want a OR-routine)
| + | |
| − | ld (hl),a ;back to buffer
| + | |
| − | inc hl ;increase pointer
| + | |
| − | ld a,(hl) ;graphbyte in a
| + | |
| − | xor e ;xor with shifted sprite byte (change to 'or e' for OR-routine)
| + | |
| − | ld (hl),a ;back to buffer
| + | |
| − | inc ix ;increase sprite adress
| + | |
| − | ex af,af'
| + | |
| − | ;exchange af with af' ( a is now the 'width' from the first line)
| + | |
| − | dec a ;decrease 'width'
| + | |
| − | push af ;push the 'width'
| + | |
| − | ex af,af'
| + | |
| − | ;exchange back
| + | |
| − | pop af ;pop the 'width'
| + | |
| − | jr nz,largeSpriteLoop2 ;if a is not 0 (if a = 0 then we would be done) loop it
| + | |
| − | pop hl ;pop gbuf adress (search the last push hl!)
| + | |
| − | pop af ;pop | to restore the real 'width'
| + | |
| − | push af ;push /
| + | |
| − | ex af,af'
| + | |
| − | ;af' must be the original 'width' when loop 'largeSpriteLoop1'
| + | |
| − | ld de,$0C ;ld de,12
| + | |
| − | add hl,de ;next line
| + | |
| − | djnz largeSpriteLoop1 ;if not b = 0 loop (b = height of sprite)
| + | |
| − | pop af ;pop because we dont want a stack problem :)
| + | |
| − | ret ;return</nowiki>
| + | |
| − | | + | |
| − | == Example ==
| + | |
| − | <nowiki>
| + | |
| − | ;...
| + | |
| − | ld l,8 ;y
| + | |
| − | ld a,16 ;x
| + | |
| − | ld b,8 ;height
| + | |
| − | ld c,2 ;width in bytes
| + | |
| − | ld ix,sprite
| + | |
| − | call largesprite
| + | |
| − | call fastcopy
| + | |
| − | ;...
| + | |
| − | sprite:
| + | |
| − | .db %11111111,%11111111
| + | |
| − | .db %10000000,%00000001
| + | |
| − | .db %10000000,%00000001
| + | |
| − | .db %10000000,%00000001
| + | |
| − | .db %10000000,%00000001
| + | |
| − | .db %10000000,%00000001
| + | |
| − | .db %10000000,%00000001
| + | |
| − | .db %11111111,%11111111</nowiki>
| + | |
| − | | + | |
| − | | + | |
| − | == Version without shadow registers ==
| + | |
| − | | + | |
| − | by Tijl Coosemans, made for Venus. Compatible with ION's routine. screenBuf must be defined.
| + | |
| − | | + | |
| − | <nowiki>
| + | |
| − | iLargeSprite
| + | |
| − | ld h,0
| + | |
| − | ld d,h
| + | |
| − | ld e,l
| + | |
| − | add hl,de
| + | |
| − | add hl,de
| + | |
| − | add hl,hl
| + | |
| − | add hl,hl
| + | |
| − | ld e,a
| + | |
| − | srl e
| + | |
| − | srl e
| + | |
| − | srl e
| + | |
| − | add hl,de
| + | |
| − | ld de,screenBuf
| + | |
| − | add hl,de
| + | |
| − | and 7
| + | |
| − | ld e,a
| + | |
| − | iLargeSpriteLoop1
| + | |
| − | push bc
| + | |
| − | push hl
| + | |
| − | ld b,c
| + | |
| − | iLargeSpriteLoop2
| + | |
| − | ld c,(ix)
| + | |
| − | ld d,0
| + | |
| − | inc ix
| + | |
| − | ld a,e
| + | |
| − | or a
| + | |
| − | jr z,iLargeSprite1
| + | |
| − | iLargeSpriteLoop3
| + | |
| − | srl c
| + | |
| − | rr d
| + | |
| − | dec a
| + | |
| − | jr nz,iLargeSpriteLoop3
| + | |
| − | iLargeSprite1
| + | |
| − | ld a,c
| + | |
| − | xor (hl)
| + | |
| − | ld (hl),a
| + | |
| − | inc hl
| + | |
| − | ld a,d
| + | |
| − | xor (hl)
| + | |
| − | ld (hl),a
| + | |
| − | djnz iLargeSpriteLoop2
| + | |
| − | pop hl
| + | |
| − | ld c,12
| + | |
| − | add hl,bc
| + | |
| − | pop bc
| + | |
| − | djnz iLargeSpriteLoop1
| + | |
| − | ret
| + | |
| − | </nowiki>
| + | |
| − | | + | |
| − | | + | |
| − | | + | |
| − | == Version with Clipping ==
| + | |
| − | This is a version that supports clipping the large sprite. It's considerable larger and requires Self modifying code. The SMC can be removed without to much difficulty. It has different inputs than ION's.
| + | |
| − | | + | |
| − | <nowiki>;--------------------------------
| + | |
| − | ;Clip Big Sprite
| + | |
| − | ;by James Montelongo
| + | |
| − | ;MAX SIZE: 64x64
| + | |
| − | ;ix - Sprite
| + | |
| − | ;b - height
| + | |
| − | ;c - width in bytes
| + | |
| − | ;d - x
| + | |
| − | ;e - y
| + | |
| − | | + | |
| − | ClipBigSprite:
| + | |
| − | ; Early out, Check if its even remotely on screen
| + | |
| − | ld a,e
| + | |
| − | cp 64
| + | |
| − | ret p
| + | |
| − | add a,b
| + | |
| − | ret m
| + | |
| − | ret z
| + | |
| − | ld a,d
| + | |
| − | cp 96
| + | |
| − | ret p
| + | |
| − | ld a,c
| + | |
| − | add a,a
| + | |
| − | add a,a
| + | |
| − | add a,a
| + | |
| − | add a,d
| + | |
| − | ret m
| + | |
| − | ret z
| + | |
| − | | + | |
| − | ld a,e
| + | |
| − | or a
| + | |
| − | jp p,Check_clip_bottom
| + | |
| − | neg
| + | |
| − | push de
| + | |
| − | ld hl,0
| + | |
| − | ld d,l
| + | |
| − | ld e,a
| + | |
| − | bit 2,c
| + | |
| − | jr z,$+2+1
| + | |
| − | add hl,de
| + | |
| − | add hl,hl
| + | |
| − | bit 1,c
| + | |
| − | jr z,$+2+1
| + | |
| − | add hl,de
| + | |
| − | add hl,hl
| + | |
| − | bit 0,c
| + | |
| − | jr z,$+2+1
| + | |
| − | add hl,de
| + | |
| − | pop de
| + | |
| − | ex de,hl
| + | |
| − | add ix,de ;Here you can save the top offset
| + | |
| − | ex de,hl
| + | |
| − | ld e,0
| + | |
| − | neg
| + | |
| − | add a,b
| + | |
| − | ld b,a
| + | |
| − | Check_clip_bottom:
| + | |
| − | | + | |
| − | ld a,e
| + | |
| − | add a,b
| + | |
| − | sub 64
| + | |
| − | jp m,Check_clip_Left
| + | |
| − | neg
| + | |
| − | add a,b
| + | |
| − | ld b,a
| + | |
| − | Check_clip_Left:
| + | |
| − | ; at this point you may want to save b
| + | |
| − | xor a
| + | |
| − | ld (bigskip),a
| + | |
| − | ld a,Clipleftsize
| + | |
| − | ld (Do_Clipleft),a
| + | |
| − | ld a,d
| + | |
| − | or a
| + | |
| − | jp p,Check_clip_right
| + | |
| − | neg
| + | |
| − | and $F8
| + | |
| − | rra
| + | |
| − | rra
| + | |
| − | rra
| + | |
| − | ex de,hl ;save the clipped left offset
| + | |
| − | ld e,a
| + | |
| − | ld d,0
| + | |
| − | add ix,de
| + | |
| − | ld (bigskip),a
| + | |
| − | ex de,hl
| + | |
| − | inc a
| + | |
| − | neg
| + | |
| − | add a,c
| + | |
| − | ld c,a
| + | |
| − | xor a
| + | |
| − | ld (Do_Clipleft),a
| + | |
| − | ld a,d
| + | |
| − | and $07
| + | |
| − | ld d,a
| + | |
| − | Check_clip_right:
| + | |
| − | | + | |
| − | ld a,Cliprightsize
| + | |
| − | ld (Do_Clipright),a
| + | |
| − | ld a,c
| + | |
| − | add a,a
| + | |
| − | add a,a
| + | |
| − | add a,a
| + | |
| − | add a,d
| + | |
| − | sub 96
| + | |
| − | jp m,Check_clip_middle
| + | |
| − | and $F8
| + | |
| − | rra
| + | |
| − | rra
| + | |
| − | rra
| + | |
| − | ld l,a
| + | |
| − | ld a,(bigskip)
| + | |
| − | add a,l
| + | |
| − | inc a
| + | |
| − | ld (bigskip),a
| + | |
| − | neg
| + | |
| − | add a,c
| + | |
| − | ld c,a
| + | |
| − | xor a
| + | |
| − | ld (Do_Clipright),a
| + | |
| − | Check_clip_middle:
| + | |
| − | ; This is where C should be saved.
| + | |
| − | xor a
| + | |
| − | ld (Do_ClipMiddle),a
| + | |
| − | ld a,c
| + | |
| − | or a
| + | |
| − | jp nz,dontskipmiddle
| + | |
| − | ld a,ClipMiddlesize
| + | |
| − | ld (Do_ClipMiddle),a
| + | |
| − | dontskipmiddle:
| + | |
| − | ld l,e
| + | |
| − | ld a,d
| + | |
| − | ld h,0
| + | |
| − | ld d,h
| + | |
| − | add hl,hl
| + | |
| − | add hl,de
| + | |
| − | add hl,hl
| + | |
| − | add hl,hl
| + | |
| − | ld e,a
| + | |
| − | and $07
| + | |
| − | xor 7
| + | |
| − | ld (BigRot1),a
| + | |
| − | ld (BigRot2),a
| + | |
| − | ld (BigRot3),a
| + | |
| − | add a,a
| + | |
| − | ld (clipbigrot1),a
| + | |
| − | ld a,$ff
| + | |
| − | clipbigrot1 = $+1
| + | |
| − | jr $
| + | |
| − | srl a
| + | |
| − | srl a
| + | |
| − | srl a
| + | |
| − | srl a
| + | |
| − | srl a
| + | |
| − | srl a
| + | |
| − | srl a
| + | |
| − | srl e
| + | |
| − | srl e
| + | |
| − | srl e
| + | |
| − | add hl,de
| + | |
| − | ld de,gbuf
| + | |
| − | add hl,de
| + | |
| − | ; This is where gbuf offset should be saved.
| + | |
| − | ld d,a
| + | |
| − | cpl
| + | |
| − | ld e,a
| + | |
| − | ;masks should be saved to
| + | |
| − | BigSpriteRow:
| + | |
| − | push bc
| + | |
| − | push hl
| + | |
| − | ld b,c
| + | |
| − | Do_Clipleft = $+1
| + | |
| − | jr Clipleft
| + | |
| − | ld a,(ix)
| + | |
| − | inc ix
| + | |
| − | BigRot1 = $+1
| + | |
| − | jr $
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | BigMask0:
| + | |
| − | and e
| + | |
| − | or (hl)
| + | |
| − | ld (hl),a
| + | |
| − | Clipleft:
| + | |
| − | Clipleftsize = Clipleft-(Do_Clipleft+1)
| + | |
| − | | + | |
| − | Do_ClipMiddle = $+1
| + | |
| − | jr $+2
| + | |
| − | BigSpriteloop:
| + | |
| − | ld a,(ix)
| + | |
| − | inc ix
| + | |
| − | BigRot2 = $+1
| + | |
| − | jr $
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | ld c,a
| + | |
| − | BigMask1:
| + | |
| − | and d
| + | |
| − | or (hl)
| + | |
| − | ld (hl),a
| + | |
| − | inc hl
| + | |
| − | ld a,c
| + | |
| − | BigMask2:
| + | |
| − | and e
| + | |
| − | or (hl)
| + | |
| − | ld (hl),a
| + | |
| − | djnz BigSpriteloop
| + | |
| − | ClipMiddle:
| + | |
| − | ClipMiddlesize = ClipMiddle-(Do_ClipMiddle+1)
| + | |
| − | | + | |
| − | Do_ClipRight = $+1
| + | |
| − | jr ClipRight
| + | |
| − | ld a,(ix)
| + | |
| − | BigRot3 = $+1
| + | |
| − | jr $
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | rrca
| + | |
| − | BigMask3:
| + | |
| − | and d
| + | |
| − | or (hl)
| + | |
| − | ld (hl),a
| + | |
| − | ClipRight:
| + | |
| − | Cliprightsize = ClipRight-(Do_ClipRight+1)
| + | |
| − | pop hl
| + | |
| − | | + | |
| − | ld bc,12 ;width of the screen
| + | |
| − | add hl,bc
| + | |
| − | | + | |
| − | bigskip = $+1
| + | |
| − | ld bc,0
| + | |
| − | add ix,bc
| + | |
| − | pop bc
| + | |
| − | djnz BigSpriteRow
| + | |
| − | ret
| + | |
| − | </nowiki>
| + | |
