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xmas_2023: sorta working vapor lock

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it's off by 2 scanlines sometimes
This commit is contained in:
Vince Weaver 2023-12-22 00:52:14 -05:00
parent 08a2f6dbf5
commit c39b0d6395
1 changed files with 103 additions and 18 deletions
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121
demos/xmas_2023/fireplace.s
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@ -113,7 +113,7 @@ loop_forever:
; Vertical blank = 4550 cycles (70 scan lines)
; Total of 17030 cycles to get back to where was
; want 32 lines of lores, which will take us into VBLANK
; want 32 lines of hires, which will take us into VBLANK
; 2080 cycles - 4 = 2076
; -4
@ -163,29 +163,57 @@ loop20: dex ; 2
; frame increment
inc FRAMEL ; 5
lda FRAMEL ; 3
and #$3f ; 2
sta FRAMEL ; 3
bne frame_noflo ; 2/3
inc FRAMEH ; 5
jmp frame_inc_done ; 3
; 15
; 23
frame_noflo:
; 8
; 16
lda $0 ; nop3 ; 3
nop ; 2
nop ; 2
frame_inc_done:
; 15 / 15
; 23 / 23
;==================
; do the action
; 4 paths?
; nothing
; draw fire1
; draw fire2
; copy hgr line
; FRAMEH = 0/1 do nothing
; FRAMEH = 2 every other line do copy
; FRAMEH = 3 exit
; FRAMEL = 1 exactly, flicker
do_action:
check_action:
; 0
lda FRAMEL ; 3
cmp #1 ; 2
beq do_flicker ; 2/3
; 7
and #1 ; 2
bne do_nothing_odd ; 2/3
; 11
lda FRAMEH ; 3
cmp #3 ; 2
beq done_cycle_count ; 2/3
; 18
cmp #2 ; 2
bcc do_nothing_less_than_2 ; blt ; 2/3
; 22
;========================
; copy text
copy_text:
ldx HGR_COPY_Y1 ; 3
lda hposn_high,X ; 4
@ -218,22 +246,69 @@ copy_hgr_line_loop:
inc HGR_COPY_Y1 ; 5
inc HGR_COPY_Y2 ; 5
jmp done_action ; 3
; 22 + 21 + 21 + 641 + 10 + 3 = 718
do_flicker:
; 8
; 718-11 = 707
; Try X=2 Y=44 cycles=705
nop
ldy #44 ; 2
loop5: ldx #2 ; 2
loop6: dex ; 2
bne loop6 ; 2nt/3
dey ; 2
bne loop5 ; 2nt/3
jmp done_action ; 3
do_nothing_odd:
; 12 if from odd
lda $0 ; nop3
lda $0 ; nop3
lda $0 ; nop3
nop ; 2
do_nothing_less_than_2:
; 23 if from less than 2
; 718-23=695
; Try X=68 Y=2 cycles=693
nop
ldy #2 ; 2
loop7: ldx #68 ; 2
loop8: dex ; 2
bne loop8 ; 2nt/3
dey ; 2
bne loop7 ; 2nt/3
done_action:
; 718 from copy_text
; do the lores screen, 160 lines
; 10400
; -4 (bit LORES)
; -15 (inc FRAME)
; -23 (inc FRAME)
; -3 (jmp)
; -693
; -718 actions
;=======
; 9685
; 9652
; Try X=214 Y=9 cycles=9685
; Try X=39 Y=48 cycles=9649
ldy #9 ; 2
loop3: ldx #214 ; 2
lda $0 ; nop3
ldy #48 ; 2
loop3: ldx #39 ; 2
loop4: dex ; 2
bne loop4 ; 2nt/3
dey ; 2
@ -243,11 +318,21 @@ loop4: dex ; 2
jmp loop_forever ; 3
stop_cycle_count:
done_cycle_count:
bit TEXTGR
cli ; enable sound: FIXME check if mockingboard there
;==========================
; start music
lda SOUND_STATUS
and #SOUND_MOCKINGBOARD
beq no_music
cli ; enable sound
no_music:
; TODO: flicker fire a bit
; start scrolling text