mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-01 01:06:33 +00:00
85 lines
2.3 KiB
ArmAsm
85 lines
2.3 KiB
ArmAsm
;FIXME -- this doesn't actuall work yet
|
|
|
|
|
|
;=============================================
|
|
; hgr_put_sprite
|
|
;=============================================
|
|
; Sprite to display in INH,INL
|
|
; Location is XPOS,YPOS
|
|
|
|
hgr_put_sprite:
|
|
|
|
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
|
|
iny ; 2
|
|
|
|
lda YPOS ; make a copy of ypos ; 3
|
|
sta TEMPY ; as we modify it ; 3
|
|
;===========
|
|
; 28
|
|
|
|
hgr_put_sprite_loop:
|
|
sty TEMP ; save sprite pointer ; 3
|
|
|
|
lda TEMPY ; load tempy
|
|
lsr
|
|
lsr ; divide by 8 to get proper row
|
|
; but mul by 4 because array is 2byte addr
|
|
tay ; put in Y
|
|
|
|
lda TEMPY
|
|
and #$7 ; bottom 3 bits
|
|
asl
|
|
asl
|
|
sta SPRITETEMP
|
|
|
|
|
|
lda hgr_offsets,Y ; lookup hi-res row address ; 5
|
|
|
|
clc
|
|
adc XPOS ; add in XPOS (FIXME: which is div by 7)
|
|
sta OUTL ; store out low byte of addy ; 3
|
|
|
|
lda hgr_offsets+1,Y ; look up high byte ; 5
|
|
adc SPRITETEMP
|
|
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
|
|
|
|
|
|
hgr_put_sprite_pixel:
|
|
lda (INL),Y ; get sprite colors ; 5
|
|
iny ; increment sprite pointer ; 2
|
|
|
|
sty TEMP ; save sprite pointer ; 3
|
|
ldy #$0 ; 2
|
|
|
|
sta (OUTL),Y
|
|
|
|
hgr_put_sprite_done_draw:
|
|
|
|
ldy TEMP ; restore sprite pointer ; 3
|
|
|
|
inc OUTL ; increment output pointer ; 5
|
|
dex ; decrement x counter ; 2
|
|
bne hgr_put_sprite_pixel ; if not done, keep looping ; 2nt/3
|
|
|
|
inc TEMPY ; 5
|
|
dec CV ; decemenet total y count ; 5
|
|
bne hgr_put_sprite_loop ; loop if not done ; 2nt/3
|
|
|
|
rts ; return ; 6
|
|
|