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dos33fsprogs
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hgr: sier: fix bug where top line drawn at bottom

This commit is contained in:
Vince Weaver 2021-04-13 15:05:07 -04:00
parent c8f7bc5982
commit 8f819534b9
1 changed files with 17 additions and 15 deletions
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32
graphics/hgr/tiny_triangles/sier_hgr.s
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@ -86,11 +86,6 @@ sier:
sta T_H
sier_outer:
lda #$42 ; start on page2 line 32 ($4200)
sta GBASH
lda #$1 ; center
sta GBASL
ldx #0 ; get X 0 for later
stx YY ; YY starts at 0
@ -134,10 +129,26 @@ no_carry:
inc speed_smc+1
lda #$1 ; center
sta GBASL
lda #$42 ; start on page2 line 32 ($4200)
sta GBASH
sier_yloop:
; GBASH is in A here
; lda GBASH ; update output pointer
sta gb_smc+2
lda GBASL ; adjust so centered
clc
adc #$1
sta gb_smc+1
ldx YY ; 3
stx add_yy_smc+1 ; 4
lda YT_LOOKUP_TABLE,X ; 4
@ -217,22 +228,13 @@ gb_smc:
jsr MOVE_DOWN ; X/Y left alone
; returns with GBASH in A
; lda GBASH ; update output pointer
sta gb_smc+2
lda GBASL ; adjust so centered
clc
adc #$1
sta gb_smc+1
inc YY ; repeat until YY=128
bpl sier_yloop
;flip_pages:
; TODO if frame rate ever gets fast enough
bmi sier_outer ; branch always
jmp sier_outer ; branch always
; $386, want to be at $3F5