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mode7: rasterbars: speed up by not drawing transparent

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This commit is contained in:
Vince Weaver 2018-01-31 00:31:16 -05:00
parent 4f5f6d08d2
commit f57854e43a
1 changed files with 16 additions and 9 deletions
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25
mode7/rasterbars.s
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@ -80,21 +80,25 @@ init_rows:
ldy #(NUM_ROWS-1) ; 2 ldy #(NUM_ROWS-1) ; 2
draw_rows_loop: draw_rows_loop:
lda row_color,Y lda row_color,Y ; 5
sta COLOR beq draw_rows_skip ; skip if black ; 2nt/3
tya sta COLOR ; 3
pha
asl
tya ; 2
pha ; 3
asl ; 2
ldy #39 ; 2 ldy #39 ; 2
sty V2 ; 3 sty V2 ; 3
ldy #0 ; 2 ldy #0 ; 2
jsr hlin_double ; hlin y,V2 at A ; 63+(X*16) jsr hlin_double ; hlin y,V2 at A ; 63+(X*16)
pla ; 4 pla ; 4
tay tay ; 2
dey draw_rows_skip:
bpl draw_rows_loop dey ; 2
bpl draw_rows_loop ; 2
;================== ;==================
@ -108,6 +112,9 @@ draw_rows_loop:
; delay? ; delay?
;================== ;==================
lda #100
jsr WAIT
;================== ;==================
; update y pointer ; update y pointer
@ -133,7 +140,7 @@ not_there:
;=================== ;===================
; color in A ; color in A
; Y=offset ; Y=offset
; Y preserved ; Y incremented
; A, X trashed ; A, X trashed
set_row_color: set_row_color: