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