mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-30 22:32:48 +00:00
409 lines
7.3 KiB
ArmAsm
409 lines
7.3 KiB
ArmAsm
; Display fancy Fireworks
|
|
|
|
; Uses the 40x48d page1/page2 every-1-scanline pageflip mode
|
|
|
|
; by deater (Vince Weaver) <vince@deater.net>
|
|
|
|
; Zero Page
|
|
FRAMEBUFFER = $00 ; $00 - $0F
|
|
YPOS = $10
|
|
YPOS_SIN = $11
|
|
CH = $24
|
|
CV = $25
|
|
GBASL = $26
|
|
GBASH = $27
|
|
BASL = $28
|
|
BASH = $29
|
|
FRAME = $60
|
|
BLARGH = $69
|
|
HGR_COLOR = $E4
|
|
DRAW_PAGE = $EE
|
|
LASTKEY = $F1
|
|
PADDLE_STATUS = $F2
|
|
TEMP = $FA
|
|
WHICH = $FB
|
|
|
|
; Soft Switches
|
|
KEYPRESS= $C000
|
|
KEYRESET= $C010
|
|
SET_GR = $C050 ; Enable graphics
|
|
FULLGR = $C052 ; Full screen, no text
|
|
PAGE0 = $C054 ; Page0
|
|
PAGE1 = $C055 ; Page1
|
|
LORES = $C056 ; Enable LORES graphics
|
|
HIRES = $C057 ; Enable HIRES graphics
|
|
|
|
PADDLE_BUTTON0 = $C061
|
|
PADDL0 = $C064
|
|
PTRIG = $C070
|
|
|
|
; ROM routines
|
|
;HGR = $F3E2
|
|
;HPLOT0 = $F457
|
|
;HGLIN = $F53A
|
|
;COLORTBL= $F6F6
|
|
TEXT = $FB36 ;; Set text mode
|
|
HOME = $FC58 ;; Clear the text screen
|
|
WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
|
|
|
|
|
|
jsr draw_fireworks
|
|
|
|
;==================================
|
|
;==================================
|
|
|
|
|
|
setup_background:
|
|
|
|
;===================
|
|
; init screen
|
|
jsr TEXT
|
|
jsr HOME
|
|
bit KEYRESET
|
|
|
|
;===================
|
|
; init vars
|
|
|
|
lda #0
|
|
sta DRAW_PAGE
|
|
|
|
;=============================
|
|
; Load graphic page0
|
|
|
|
lda #$0c
|
|
sta BASH
|
|
lda #$00
|
|
sta BASL ; load image to $c00
|
|
|
|
lda #<bg_final_low
|
|
sta GBASL
|
|
lda #>bg_final_low
|
|
sta GBASH
|
|
jsr load_rle_gr
|
|
|
|
lda #4
|
|
sta DRAW_PAGE
|
|
|
|
jsr gr_copy_to_current ; copy to page1
|
|
|
|
; GR part
|
|
bit PAGE1
|
|
bit LORES ; 4
|
|
bit SET_GR ; 4
|
|
bit FULLGR ; 4
|
|
|
|
jsr wait_until_keypressed
|
|
|
|
|
|
;=============================
|
|
; Load graphic page1
|
|
|
|
lda #$0c
|
|
sta BASH
|
|
lda #$00
|
|
sta BASL ; load image to $c00
|
|
|
|
lda #<bg_final_high
|
|
sta GBASL
|
|
lda #>bg_final_high
|
|
sta GBASH
|
|
jsr load_rle_gr
|
|
|
|
lda #0
|
|
sta DRAW_PAGE
|
|
|
|
jsr gr_copy_to_current
|
|
|
|
; GR part
|
|
bit PAGE0
|
|
|
|
jsr wait_until_keypressed
|
|
|
|
|
|
;==============================
|
|
; setup graphics for vapor lock
|
|
;==============================
|
|
|
|
; Clear Page0
|
|
lda #$0
|
|
sta DRAW_PAGE
|
|
lda #$44
|
|
jsr clear_gr
|
|
|
|
; Make screen half green
|
|
lda #$11
|
|
ldy #24
|
|
jsr clear_page_loop
|
|
|
|
|
|
;=====================================================
|
|
; attempt vapor lock
|
|
; by reading the "floating bus" we can see most recently
|
|
; written value of the display
|
|
; we look for $55 (which is the grey line)
|
|
;=====================================================
|
|
; See:
|
|
; Have an Apple Split by Bob Bishop
|
|
; Softalk, October 1982
|
|
|
|
; Challenges: each scan line scans 40 bytes.
|
|
; The blanking happens at the *beginning*
|
|
; So 65 bytes are scanned, starting at adress of the line - 25
|
|
|
|
; the scan takes 8 cycles, look for 4 repeats of the value
|
|
; to avoid false positive found if the horiz blanking is mirroring
|
|
; the line (max 3 repeats in that case)
|
|
|
|
vapor_lock_loop: ; first make sure we have all zeroes
|
|
LDA #$11
|
|
zxloop:
|
|
LDX #$04
|
|
wiloop:
|
|
CMP $C051
|
|
BNE zxloop
|
|
DEX
|
|
BNE wiloop
|
|
|
|
LDA #$44 ; now look for our border color (4 times)
|
|
zloop:
|
|
LDX #$04
|
|
qloop:
|
|
CMP $C051
|
|
BNE zloop
|
|
DEX
|
|
BNE qloop
|
|
|
|
; found first line of black after green, at up to line 26 on screen
|
|
; so we want roughly 22 lines * 4 = 88*65 = 5720 + 4550 = 10270
|
|
; - 65 (for the scanline we missed) = 10205 - 12 = 10193
|
|
|
|
jsr gr_copy_to_current ; 6+ 9292
|
|
; 10193 - 9298 = 895
|
|
; Fudge factor (unknown) -30 = 865
|
|
|
|
; GR part
|
|
bit LORES ; 4
|
|
bit SET_GR ; 4
|
|
bit FULLGR ; 4
|
|
|
|
; Try X=88 Y=2 cycles=893 R2
|
|
|
|
nop
|
|
ldy #2 ; 2
|
|
loopA:
|
|
ldx #88 ; 2
|
|
loopB:
|
|
dex ; 2
|
|
bne loopB ; 2nt/3
|
|
|
|
dey ; 2
|
|
bne loopA ; 2nt/3
|
|
|
|
jmp display_loop
|
|
.align $100
|
|
|
|
|
|
;================================================
|
|
; Display Loop
|
|
;================================================
|
|
; each scan line 65 cycles
|
|
; 1 cycle each byte (40cycles) + 25 for horizontal
|
|
; Total of 12480 cycles to draw screen
|
|
; Vertical blank = 4550 cycles (70 scan lines)
|
|
; Total of 17030 cycles to get back to where was
|
|
|
|
; We want to alternate between page1 and page2 every 65 cycles
|
|
; vblank = 4550 cycles to do scrolling
|
|
|
|
|
|
; 2 + 48*( (4+2+25*(2+3)) + (4+2+23*(2+3)+4+5)) + 9)
|
|
; 48*[(6+125)-1] + [(6+115+10)-1]
|
|
|
|
display_loop:
|
|
|
|
; 152 * 65 = 9880 - 12 = 9868
|
|
|
|
bit HIRES ; 4
|
|
bit PAGE0 ; 4
|
|
|
|
; Try X=81 Y=24 cycles=9865 R3
|
|
|
|
lda DRAW_PAGE ; 3
|
|
|
|
ldy #24 ; 2
|
|
sloop1:
|
|
ldx #81 ; 2
|
|
sloop2:
|
|
dex ; 2
|
|
bne sloop2 ; 2nt/3
|
|
|
|
dey ; 2
|
|
bne sloop1 ; 2nt/3
|
|
|
|
bit LORES ; 4
|
|
|
|
|
|
;top_loop:
|
|
;
|
|
;
|
|
; ldy #76 ; 2
|
|
;
|
|
;outer_loop:
|
|
;
|
|
; bit PAGE0 ; 4
|
|
; ldx #12 ; 65 cycles with PAGE0 ; 2
|
|
;page0_loop: ; delay 61+bit
|
|
; dex ; 2
|
|
; bne page0_loop ; 2/3
|
|
|
|
|
|
; bit(4) -1(fallthrough) + loop*5 -1(fallthrouh)+4 extra = 61
|
|
; 5L = 55
|
|
;
|
|
; bit PAGE1 ; 4
|
|
; ldx #11 ; 65 cycles with PAGE1 ; 2
|
|
; ;
|
|
;page1_loop: ; delay 115+(7 loop)+4 (bit)+4(extra)
|
|
; dex ; 2
|
|
; bne page1_loop ; 2/3
|
|
;
|
|
; dey ; 2
|
|
; bne outer_loop ; 2/3
|
|
;
|
|
;
|
|
;
|
|
;bottom_loop:
|
|
|
|
|
|
|
|
ldy #20 ; 2
|
|
|
|
bouter_loop:
|
|
|
|
bit PAGE0 ; 4
|
|
ldx #12 ; 65 cycles with PAGE0 ; 2
|
|
bpage0_loop: ; delay 61+bit
|
|
dex ; 2
|
|
bne bpage0_loop ; 2/3
|
|
|
|
|
|
; bit(4) -1(fallthrough) + loop*5 -1(fallthrouh)+4 extra = 61
|
|
; 5L = 55
|
|
|
|
bit PAGE1 ; 4
|
|
ldx #11 ; 65 cycles with PAGE1 ; 2
|
|
;
|
|
bpage1_loop: ; delay 115+(7 loop)+4 (bit)+4(extra)
|
|
dex ; 2
|
|
bne bpage1_loop ; 2/3
|
|
|
|
dey ; 2
|
|
bne bouter_loop ; 2/3
|
|
|
|
|
|
|
|
;======================================================
|
|
; We have 4550 cycles in the vblank, use them wisely
|
|
;======================================================
|
|
; do_nothing should be 4550+1 -2-9 -7= 4533
|
|
; 4550
|
|
; +1 fallthrough
|
|
; -2 ldy at entry
|
|
; -7 keyboard
|
|
; -6 jsr
|
|
; -3 jmp
|
|
; ========
|
|
; 4533
|
|
|
|
jsr do_nothing ; 6
|
|
|
|
lda KEYPRESS ; 4
|
|
bpl no_keypress ; 3
|
|
jmp loop_forever
|
|
no_keypress:
|
|
|
|
jmp display_loop ; 3
|
|
|
|
loop_forever:
|
|
jmp loop_forever
|
|
|
|
|
|
;=================================
|
|
; do nothing
|
|
;=================================
|
|
; and take 4533-6 = 4527 cycles to do it
|
|
do_nothing:
|
|
|
|
; Try X=4 Y=174 cycles=4525 R2
|
|
|
|
nop ; 2
|
|
|
|
ldy #174 ; 2
|
|
loop1:
|
|
ldx #4 ; 2
|
|
loop2:
|
|
dex ; 2
|
|
bne loop2 ; 2nt/3
|
|
|
|
dey ; 2
|
|
bne loop1 ; 2nt/3
|
|
|
|
|
|
rts ; 6
|
|
|
|
|
|
|
|
;==================================
|
|
; HLINE
|
|
;==================================
|
|
|
|
; Color in A
|
|
; Y has which line
|
|
hline:
|
|
pha ; 3
|
|
ldx gr_offsets,y ; 4+
|
|
stx hline_loop+1 ; 4
|
|
lda gr_offsets+1,y ; 4+
|
|
clc ; 2
|
|
adc DRAW_PAGE ; 3
|
|
sta hline_loop+2 ; 4
|
|
pla ; 4
|
|
ldx #39 ; 2
|
|
hline_loop:
|
|
sta $5d0,X ; 38 ; 5
|
|
dex ; 2
|
|
bpl hline_loop ; 2nt/3
|
|
rts ; 6
|
|
|
|
;==========================
|
|
; Clear gr screen
|
|
;==========================
|
|
; Color in A
|
|
clear_gr:
|
|
ldy #46
|
|
clear_page_loop:
|
|
jsr hline
|
|
dey
|
|
dey
|
|
bpl clear_page_loop
|
|
rts
|
|
|
|
gr_offsets:
|
|
.word $400,$480,$500,$580,$600,$680,$700,$780
|
|
.word $428,$4a8,$528,$5a8,$628,$6a8,$728,$7a8
|
|
.word $450,$4d0,$550,$5d0,$650,$6d0,$750,$7d0
|
|
|
|
|
|
.include "../asm_routines/gr_unrle.s"
|
|
.include "../asm_routines/keypress.s"
|
|
.include "gr_copy.s"
|
|
.include "random16.s"
|
|
.include "fw.s"
|
|
.include "hgr.s"
|
|
|
|
background:
|
|
|
|
.include "background_final.inc"
|
|
|
|
|