Apple-2-SW/dos33fsprogs
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optimize putsprite code

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This commit is contained in:
Peter Ferrie 2019-06-01 00:00:40 -04:00 committed by Vince Weaver
parent efbb34fce7
commit c863fd9462
1 changed files with 10 additions and 12 deletions
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22
pt3_player/gr_putsprite.s
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@ -21,27 +21,24 @@ put_sprite:
sta CV ; ysize is in CV ; 3
iny ; 2
lda YPOS ; make a copy of ypos ; 3
sta TEMPY ; as we modify it ; 3
ldx YPOS ; make a copy of ypos ; 3
;===========
; 28
; 25
put_sprite_loop:
sty TEMP ; save sprite pointer ; 3
ldy TEMPY ; 3
lda gr_offsets,Y ; lookup low-res memory address ; 4
stx TEMPY ; as we modify it ; 3
lda gr_offsets,X ; 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
lda gr_offsets+1,X ; 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 CH ; load xsize into x ; 3
;===========
; 34
; 28
put_sprite_pixel:
lda (INL),Y ; get sprite colors ; 5
iny ; increment sprite pointer ; 2
@ -88,12 +85,13 @@ put_sprite_done_draw:
;==============
; 12/13
inc TEMPY ; each line has two y vars ; 5
inc TEMPY ; 5
ldx TEMPY ; 3
inx ; each line has two y vars ; 2
inx ; 2
dec CV ; decemenet total y count ; 5
bne put_sprite_loop ; loop if not done ; 2nt/3
;==============
; 17/18
; 14/15
rts ; return ; 6