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pt3: optimize fast_clear

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This commit is contained in:
Peter Ferrie 2019-06-01 21:43:18 -04:00 committed by Vince Weaver
parent a24bf74d23
commit cb037335f7
1 changed files with 7 additions and 12 deletions
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19
pt3_player/gr_fast_clear.s
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@ -4,7 +4,6 @@ clear_screens:
;===================================
lda #$0
sta DRAW_PAGE
jsr clear_top
jsr clear_bottom
@ -13,7 +12,6 @@ clear_screens:
;===================================
lda #$4
sta DRAW_PAGE
jsr clear_top
jmp clear_bottom
@ -29,11 +27,12 @@ clear_screens:
; (pageX,40rows): 50*120+4+6 = 6010 = 6.0ms 166Hz
; 50*120+4+6+37 = 6055 = 6.0ms 166Hz
clear_top:
lda #0 ; 2
clear_top_a:
sta COLOR ; 3
ldy #0 ; 2
clear_top_y:
sty COLOR ; 3
sta DRAW_PAGE ; 3
clc ; 2
lda DRAW_PAGE ; 3
adc #4 ; 2
sta __ctf+2 ; 3
@ -80,7 +79,6 @@ clear_bottoms:
;===================================
lda #$0
sta DRAW_PAGE
jsr clear_bottom
;===================================
@ -88,7 +86,6 @@ clear_bottoms:
;===================================
lda #$4
sta DRAW_PAGE
; fall through
;=========================================================
@ -97,8 +94,8 @@ clear_bottoms:
; clear bottom of draw page
clear_bottom:
sta DRAW_PAGE ; 3
clc ; 2
lda DRAW_PAGE ; 3
adc #6 ; 2
sta __cbf2+2 ; 3
@ -130,7 +127,6 @@ clear_screens_notext:
;===================================
lda #$0
sta DRAW_PAGE
jsr clear_all
;===================================
@ -138,7 +134,6 @@ clear_screens_notext:
;===================================
lda #$4
sta DRAW_PAGE
; fall through
@ -149,8 +144,8 @@ clear_screens_notext:
; clear color: clear_all_color+1
clear_all:
sta DRAW_PAGE ; 3
clc ; 2
lda DRAW_PAGE ; 3
adc #4 ; 2
sta __caf+2 ; 3