mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-12 12:07:53 +00:00
360 lines
7.4 KiB
ArmAsm
360 lines
7.4 KiB
ArmAsm
;=============================================
|
|
; put_sprite_crop
|
|
;=============================================
|
|
; Sprite to display in INH,INL
|
|
; Location is XPOS,YPOS
|
|
; Note, only works if YPOS is multiple of two
|
|
|
|
; transparent color is $A (grey #2)
|
|
; this means we can have black ($0) in a sprite
|
|
|
|
; FIXME: force YPOS to be even?
|
|
|
|
put_sprite_crop:
|
|
|
|
ldy #0 ; byte 0 is xsize ; 2
|
|
lda (INL),Y ; 5
|
|
sta CH ; xsize is in CH ; 3
|
|
iny ; 2
|
|
clc
|
|
adc XPOS
|
|
sta XMAX
|
|
|
|
lda (INL),Y ; byte 1 is ysize ; 5
|
|
sta CV ; ysize is in CV ; 3
|
|
iny ; 2
|
|
|
|
lda YPOS ; make a copy of ypos ; 3
|
|
sta TEMPY ; as we modify it ; 3
|
|
;===========
|
|
; 28
|
|
put_sprite_crop_loop:
|
|
sty TEMP ; save sprite pointer ; 3
|
|
ldy TEMPY ; 3
|
|
|
|
bpl put_sprite_crop_pos ; if < 0, skip to next
|
|
|
|
clc ; skip line in sprite too
|
|
lda TEMP
|
|
adc CH
|
|
tay
|
|
|
|
bne crop_increment_y
|
|
|
|
put_sprite_crop_pos:
|
|
|
|
psc_smc1:
|
|
cpy #48 ; bge if >= 48, done sprite
|
|
bcs crop_sprite_done
|
|
|
|
|
|
lda gr_offsets,Y ; lookup low-res memory address ; 4
|
|
clc ; 2
|
|
adc XPOS ; add in xpos ; 3
|
|
sta OUTL ; store out low byte of addy ; 3
|
|
clc ; never wraps, handle negative
|
|
lda gr_offsets+1,Y ; look up high byte ; 4
|
|
adc DRAW_PAGE ; ; 3
|
|
sta OUTH ; and store it out ; 3
|
|
ldy TEMP ; restore sprite pointer ; 3
|
|
|
|
; OUTH:OUTL now points at right place
|
|
|
|
ldx XPOS ; load xposition into x ; 3
|
|
;===========
|
|
; 34
|
|
crop_put_sprite_pixel:
|
|
lda (INL),Y ; get sprite colors ; 5
|
|
iny ; increment sprite pointer ; 2
|
|
sty TEMP ; save sprite pointer ; 3
|
|
|
|
|
|
cpx #0 ; if off-screen left, skip draw
|
|
bmi skip_drawing
|
|
cpx #40
|
|
bcs skip_drawing ; if off-screen right, skip draw
|
|
|
|
ldy #$0 ; 2
|
|
|
|
; check if completely transparent
|
|
; if so, skip
|
|
|
|
cmp #$aa ; if all zero, transparent ; 2
|
|
beq crop_put_sprite_done_draw ; don't draw it ; 2nt/3
|
|
;==============
|
|
; 16/17
|
|
|
|
sta COLOR ; save color for later ; 3
|
|
|
|
; check if top pixel transparent
|
|
|
|
and #$f0 ; check if top nibble zero ; 2
|
|
cmp #$a0
|
|
bne crop_put_sprite_bottom ; if not skip ahead ; 2nt/3
|
|
;==============
|
|
; 7/8
|
|
|
|
lda COLOR
|
|
and #$0f
|
|
sta COLOR
|
|
|
|
lda #$f0 ; setup mask ; 2
|
|
sta MASK ; 3
|
|
bmi crop_put_sprite_mask ; always? ; 3
|
|
;=============
|
|
; 8
|
|
|
|
crop_put_sprite_bottom:
|
|
lda COLOR ; re-load color ; 3
|
|
and #$0f ; check if bottom nibble zero ; 2
|
|
cmp #$0a
|
|
bne crop_put_sprite_all ; if not, skip ahead ; 2nt/3
|
|
;=============
|
|
; 7/8
|
|
|
|
lda COLOR
|
|
and #$f0
|
|
sta COLOR
|
|
lda #$0f ; 2
|
|
sta MASK ; setup mask ; 3
|
|
;===========
|
|
; 5
|
|
|
|
crop_put_sprite_mask:
|
|
lda (OUTL),Y ; get color at output ; 5
|
|
and MASK ; mask off unneeded part ; 3
|
|
ora COLOR ; or the color in ; 3
|
|
sta (OUTL),Y ; store it back ; 6
|
|
|
|
jmp crop_put_sprite_done_draw ; we are done ; 3
|
|
;===========
|
|
; 20
|
|
|
|
crop_put_sprite_all:
|
|
lda COLOR ; load color ; 3
|
|
sta (OUTL),Y ; and write it out ; 6
|
|
;============
|
|
; 9
|
|
|
|
crop_put_sprite_done_draw:
|
|
skip_drawing:
|
|
|
|
ldy TEMP ; restore sprite pointer ; 3
|
|
|
|
inc OUTL ; increment output pointer ; 5
|
|
inx ; increment x counter ; 2
|
|
cpx XMAX
|
|
bne crop_put_sprite_pixel ; if not done, keep looping ; 2nt/3
|
|
;==============
|
|
; 12/13
|
|
crop_increment_y:
|
|
|
|
inc TEMPY ; each line has two y vars ; 5
|
|
inc TEMPY ; 5
|
|
dec CV ; decemenet total y count ; 5
|
|
bne put_sprite_crop_loop ; loop if not done ; 2nt/3
|
|
;==============
|
|
; 17/18
|
|
crop_sprite_done:
|
|
rts ; return ; 6
|
|
|
|
|
|
|
|
; 0,0 = 400+0
|
|
; -1,0 = 400+ff=4ff, inc=400
|
|
|
|
; sprite: 5x4
|
|
;
|
|
; -2,0 Xstart=0, sprite_offset=2, xsize=3
|
|
; -1,0, Xstart=0, sprite_offset=1, xsize=4
|
|
; 0,0, Xstrat=0, sprite_offset=0, xsize=5
|
|
; 1,0, Xstart=1, sprite_offset=0, xsize=5
|
|
;
|
|
; 39,0 Xstart=39, sprite_offset=0, xsize=1
|
|
;
|
|
;
|
|
;
|
|
;
|
|
|
|
|
|
.if 0
|
|
;=============================================
|
|
; put_sprite_flipped_crop
|
|
;=============================================
|
|
; Sprite to display in INH,INL
|
|
; Location is XPOS,YPOS
|
|
; Note, only works if YPOS is multiple of two
|
|
|
|
; transparent color is $A (grey #2)
|
|
; this means we can have black ($0) in a sprite
|
|
|
|
|
|
put_sprite_flipped_crop:
|
|
|
|
ldy #0 ; byte 0 is xsize ; 2
|
|
lda (INL),Y ; 5
|
|
sta CH ; xsize is in CH ; 3
|
|
iny ; 2
|
|
|
|
|
|
lda (INL),Y ; byte 1 is ysize ; 5
|
|
sta CV ; ysize is in CV ; 3
|
|
dey ; make Y zero again ; 2
|
|
|
|
lda INH ; ???
|
|
sta ppfc_smc+2
|
|
clc
|
|
lda INL
|
|
adc #1 ; add one (not two) because X counts
|
|
; from CH to 1 (not CH-1 to 0)
|
|
sta ppfc_smc+1
|
|
bcc psfc16
|
|
inc ppfc_smc+2
|
|
psfc16:
|
|
|
|
|
|
lda YPOS ; make a copy of ypos ; 3
|
|
|
|
sta TEMPY ; as we modify it ; 3
|
|
;===========
|
|
; 28
|
|
|
|
|
|
|
|
put_spritefc_loop:
|
|
; sty TEMP ; save sprite pointer ; 3
|
|
ldy TEMPY ; 3
|
|
|
|
bmi fcrop_increment_y ; if < 0, skip to next
|
|
psc_smc2:
|
|
cpy #48 ; bge if >= 48, done sprite
|
|
bcs fcrop_sprite_done
|
|
|
|
|
|
lda gr_offsets,Y ; lookup low-res memory address ; 4
|
|
clc ; 2
|
|
adc XPOS ; add in xpos ; 3
|
|
sta OUTL ; store out low byte of addy ; 3
|
|
lda gr_offsets+1,Y ; look up high byte ; 4
|
|
clc
|
|
adc DRAW_PAGE ; ; 3
|
|
sta OUTH ; and store it out ; 3
|
|
; ldy TEMP ; restore sprite pointer ; 3
|
|
|
|
; OUTH:OUTL now points at right place
|
|
|
|
ldx CH ; load xsize into x ; 3
|
|
;===========
|
|
; 34
|
|
put_spritefc_pixel:
|
|
|
|
clc
|
|
txa ; want (CH-X-1)+XPOS
|
|
eor #$ff
|
|
adc CH
|
|
adc XPOS
|
|
|
|
bmi cskip_drawing
|
|
cmp #40
|
|
|
|
bcs cskip_drawing ; if off-screen right, skip draw
|
|
|
|
ppfc_smc:
|
|
lda $C000,X ; get sprite colors ; 5
|
|
; iny ; increment sprite pointer ; 2
|
|
; sty TEMP ; save sprite pointer ; 3
|
|
ldy #$0 ; 2
|
|
|
|
; check if completely transparent
|
|
; if so, skip
|
|
|
|
cmp #$aa ; if all zero, transparent ; 2
|
|
beq put_spritefc_done_draw ; don't draw it ; 2nt/3
|
|
;==============
|
|
; 16/17
|
|
|
|
sta COLOR ; save color for later ; 3
|
|
|
|
; check if top pixel transparent
|
|
|
|
and #$f0 ; check if top nibble zero ; 2
|
|
cmp #$a0
|
|
bne put_spritefc_bottom ; if not skip ahead ; 2nt/3
|
|
;==============
|
|
; 7/8
|
|
|
|
lda COLOR
|
|
and #$0f
|
|
sta COLOR
|
|
|
|
lda #$f0 ; setup mask ; 2
|
|
sta MASK ; 3
|
|
bmi put_spritefc_mask ; always? ; 3
|
|
;=============
|
|
; 8
|
|
|
|
put_spritefc_bottom:
|
|
lda COLOR ; re-load color ; 3
|
|
and #$0f ; check if bottom nibble zero ; 2
|
|
cmp #$0a
|
|
bne put_spritefc_all ; if not, skip ahead ; 2nt/3
|
|
;=============
|
|
; 7/8
|
|
|
|
lda COLOR
|
|
and #$f0
|
|
sta COLOR
|
|
lda #$0f ; 2
|
|
sta MASK ; setup mask ; 3
|
|
;===========
|
|
; 5
|
|
|
|
put_spritefc_mask:
|
|
lda (OUTL),Y ; get color at output ; 5
|
|
and MASK ; mask off unneeded part ; 3
|
|
ora COLOR ; or the color in ; 3
|
|
sta (OUTL),Y ; store it back ; 6
|
|
|
|
jmp put_spritefc_done_draw ; we are done ; 3
|
|
;===========
|
|
; 20
|
|
|
|
put_spritefc_all:
|
|
lda COLOR ; load color ; 3
|
|
sta (OUTL),Y ; and write it out ; 6
|
|
;============
|
|
; 9
|
|
|
|
put_spritefc_done_draw:
|
|
cskip_drawing:
|
|
; ldy TEMP ; restore sprite pointer ; 3
|
|
|
|
inc OUTL ; increment output pointer ; 5
|
|
dex ; decrement x counter ; 2
|
|
bne put_spritefc_pixel ; if not done, keep looping ; 2nt/3
|
|
;==============
|
|
; 12/13
|
|
fcrop_increment_y:
|
|
inc TEMPY ; each line has two y vars ; 5
|
|
inc TEMPY ; 5
|
|
|
|
lda CH
|
|
clc
|
|
adc ppfc_smc+1
|
|
sta ppfc_smc+1
|
|
bcc psfco
|
|
inc ppfc_smc+2
|
|
psfco:
|
|
|
|
dec CV ; decemenet total y count ; 5
|
|
beq fcrop_sprite_done ; loop if not done ; 2nt/3
|
|
jmp put_spritefc_loop
|
|
;==============
|
|
; 17/18
|
|
|
|
fcrop_sprite_done:
|
|
rts ; return ; 6
|
|
|
|
|
|
.endif
|