mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-16 07:29:29 +00:00
300 lines
4.8 KiB
ArmAsm
300 lines
4.8 KiB
ArmAsm
; Flyer
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; 512 byte Apple II "boot sector" with graphics and Music
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; by Vince `deater` Weaver, vince@deater.net --- d e s i r e ---
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; 178 bytes -- original conversion from BASIC
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; 176 bytes -- know HGR2 returns with A=0
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; 172 bytes -- optimize page flip code
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; 170 bytes -- assume XDRAW never got over X=256
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; 504 bytes -- merge in the music code
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; 507 bytes -- turn off drive motor
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; 510 bytes -- add color change bg
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; 508 bytes -- assume Y=0 when entering mockingboard init code
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; 506 bytes -- optimize frame wrap
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; 505 bytes -- shave byte off wicket scale
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; 504 bytes -- tail call in xdraw
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; 512 bytes -- switch color with music
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; 510 bytes -- unneeded reload of A
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; 517 bytes -- made flyer go back and forth
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; 512 bytes -- removed extra cc, merged to common ZP zero init
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; 510 bytes -- optimize page flip
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; zero page locations
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AY_REGS = $70
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FRAME = $80
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SONG_OFFSET = $81
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SONG_COUNTDOWN = $82
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HGR_COLOR = $E4
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HGR_PAGE = $E6
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HGR_SCALE = $E7
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HGR_ROTATION = $F9
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FRAME2 = $DC
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HORIZON_Y = $FD
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HORIZON_LINE = $FE
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; soft-switches
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KEYPRESS = $C000
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KEYRESET = $C010
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PAGE1 = $C054
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PAGE2 = $C055
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; ROM calls
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HGR2 = $F3D8 ; after: A=0, Y=0, HGR_SHAPE=$40/$60
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HCLR = $F3F2 ; clear current page to 0
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BKGND0 = $F3F4 ; clear current page to A
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HPOSN = $F411 ; move to (Y,X), (A) (saves A,X,Y to zero page)
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HPLOT0 = $F457 ; plot at (Y,X), (A) (calls HPOSN)
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HGLIN = $F53A ; line to (X,A), (Y)
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DRAW0 = $F601
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XDRAW0 = $F65D
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.byte 2 ; number of sectors to load
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; turn off drive motor
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lda $C088,X ; turn off drive motor
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; hopefully slot*16 is in X
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flyer:
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jsr HGR2 ; HGR2 HGR_PAGE=$40
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; sta FRAME ; A=0, Y=0 after HGR2
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; init by mockingboard init
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;===================
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; music Player Setup
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tracker_song = peasant_song
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; assume mockingboard in slot#4
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; inline mockingboard_init
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.include "mockingboard_init.s"
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.include "tracker_init.s"
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; start the music playing
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; cli
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animate_loop:
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clc
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lda #96
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adc FRAME
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sta HORIZON_LINE ; S=96+FRAME
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; flip draw page $20/$40
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lda HGR_PAGE
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eor #$60
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sta HGR_PAGE
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; flip page
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; have $20/$40 want to map to C054/C055
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asl
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asl ; $20 -> C=1 $00
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asl ; $40 -> C=0 $00
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rol
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tax
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cmp PAGE1,X
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; clear screen
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clear_screen_smc:
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lda #$00 ; clear to this color
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jsr BKGND0
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;===============
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; draw mountain
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; FIXME: we in theory only have to do this once
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; as we never over-write it
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; the problem is we have no easy way to just
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; erase half the screen
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; color = blue (6)
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lda #$D5
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sta HGR_COLOR
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; HPLOT 0,96 TO 140,80
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ldy #0
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ldx #0
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lda #96
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jsr HPLOT0 ; plot at (Y,X), (A)
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ldx #0
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lda #140
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ldy #80
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jsr HGLIN ; line to (X,A),(Y)
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; HPLOT TO 279,96
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ldx #1
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lda #23
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ldy #96
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jsr HGLIN
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; color = green (1)
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; blue =$D5=1101 0101 want 0010 1010
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lda #$2A
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sta HGR_COLOR
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horizon_lines_loop:
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lsr HORIZON_LINE ; S=S/2:Y=96+S
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clc
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lda #96
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adc HORIZON_LINE
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sta HORIZON_Y
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; HPLOT 0,Y TO 279,Y
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ldy #0
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ldx #0
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; lda HORIZON_Y
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jsr HPLOT0 ; plot at (Y,X), (A)
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ldx #1
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lda #23
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ldy HORIZON_Y
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jsr HGLIN ; line to (X,A),(Y)
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;================
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; draw wicket
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; XDRAW 1 AT 140,Y
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lda HORIZON_LINE
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lsr
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lsr ; SCALE=1+S/4
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tax
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inx
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stx HGR_SCALE
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; ldy #0
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ldx #140 ; X=140
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lda HORIZON_Y ; Y
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jsr xdraw
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lda HORIZON_LINE
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bne horizon_lines_loop ; IF S>1 THEN 8
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;===================
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; draw ship
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; XDRAW 1 AT 140+16*SIN(H),180
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lda #2
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sta HGR_SCALE ; SCALE=2
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;====================
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; move ship
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inc FRAME2
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lda FRAME2
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and #$7
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tay
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ldx positions,Y
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;=========================
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; draw ship
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; ldx #140
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lda #180 ; Y=180
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jsr xdraw
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; H=H+0.3
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;========================
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; wrap frame
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; J=(J+12)*(J<84)
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lda FRAME
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cmp #84 ; if (J>84) then J=0
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bcc no_reset_frame ; bge
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; we know carry is set here
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lda #$F3 ; (-13) -12-C
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no_reset_frame:
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; we know carry is clear here
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adc #12 ; J=J+12
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sta FRAME
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;=======================
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; check for keypress
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check_keypress:
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lda KEYPRESS
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bmi quiet
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cli
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jmp animate_loop
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quiet:
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lda #$3f
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sta AY_REGS+7
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end:
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brk ; end?
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;=======================
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; xdraw
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;=======================
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xdraw:
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; setup X and Y co-ords
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ldy #0 ; XPOSH always 0 for us
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; ldx XPOS
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; lda YPOS
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jsr HPOSN ; X= (y,x) Y=(a)
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ldx #<ship_table
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ldy #>ship_table
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lda #0 ; set rotation
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jmp XDRAW0 ; XDRAW 1 AT X,Y
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; Both A and X are 0 at exit
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; optimize, can probably shave byte off
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; was originally in ASCII for basic bot purposes
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; "#%%-...",0
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; but we don't have that limitation
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ship_table:
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.byte $23 ; 00 100 011 NLT UP X
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.byte $25 ; 00 100 101 RT UP X
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.byte $25 ; 00 100 101 RT UP X
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.byte $2D ; 00 101 101 RT RT X
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.byte $2E ; 00 101 110 DN RT X
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.byte $2E ; 00 101 110 DN RT X
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.byte $0E ; 00 001 110 NDN RT X
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.byte $0
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positions:
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; +4 +8 +8 +4
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.byte 170,174,182,190,194,190,182,174
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.include "interrupt_handler.s"
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.include "mockingboard_constants.s"
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; music
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.include "mA2E_3.s"
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