mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-10-30 02:26:58 +00:00
476 lines
7.4 KiB
ArmAsm
476 lines
7.4 KiB
ArmAsm
; Uses the 40x48d page1/page2 every-1-scanline pageflip mode
|
|
|
|
; self modifying code to get some extra colors (pseudo 40x192 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
|
|
DRAW_PAGE = $EE
|
|
LASTKEY = $F1
|
|
PADDLE_STATUS = $F2
|
|
TEMP = $FA
|
|
WHICH = $FB
|
|
|
|
OUTL = $FE
|
|
OUTH = $FF
|
|
|
|
|
|
; 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
|
|
PADDLE_BUTTON0 = $C061
|
|
PADDL0 = $C064
|
|
PTRIG = $C070
|
|
|
|
; ROM routines
|
|
|
|
TEXT = $FB36 ;; Set text mode
|
|
HOME = $FC58 ;; Clear the text screen
|
|
WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
|
|
|
|
|
|
start_rasterbars:
|
|
|
|
;===================
|
|
; init screen
|
|
jsr TEXT
|
|
jsr HOME
|
|
bit KEYRESET
|
|
|
|
;===================
|
|
; init vars
|
|
|
|
lda #0
|
|
sta DRAW_PAGE
|
|
sta WHICH
|
|
|
|
;=============================
|
|
; Load graphic page0
|
|
|
|
lda #$0c
|
|
sta BASH
|
|
lda #$00
|
|
sta BASL ; load image to $c00
|
|
|
|
lda WHICH
|
|
asl
|
|
asl ; which*4
|
|
tay
|
|
|
|
lda pictures,Y
|
|
sta GBASL
|
|
lda pictures+1,Y
|
|
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 WHICH
|
|
asl
|
|
asl ; which*4
|
|
tay
|
|
|
|
lda pictures+2,Y
|
|
sta GBASL
|
|
lda pictures+3,Y
|
|
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
|
|
;==============================
|
|
|
|
jsr vapor_lock
|
|
|
|
; vapor lock returns with us at beginning of hsync in line
|
|
; 114 (7410 cycles), so with 5070 lines to go
|
|
|
|
; GR part
|
|
bit LORES ; 4
|
|
bit SET_GR ; 4
|
|
bit FULLGR ; 4
|
|
|
|
jsr gr_copy_to_current ; 6+ 9292
|
|
|
|
; 5070 + 4550 = 9620
|
|
; 9292
|
|
; 12
|
|
; 6
|
|
; ====
|
|
; 310
|
|
|
|
; - 3 for jmp
|
|
; 307
|
|
|
|
; Try X=9 Y=6 cycles=307
|
|
|
|
ldy #6 ; 2
|
|
loopA: ldx #9 ; 2
|
|
loopB: dex ; 2
|
|
bne loopB ; 2nt/3
|
|
dey ; 2
|
|
bne loopA ; 2nt/3
|
|
|
|
jmp display_loop ; 3
|
|
|
|
.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
|
|
|
|
|
|
display_loop:
|
|
|
|
.include "rasterbars_screen.s"
|
|
|
|
;======================================================
|
|
; We have 4550 cycles in the vblank, use them wisely
|
|
;======================================================
|
|
|
|
; 4550 -- VBLANK
|
|
; -582 -- erase 22+4*(8+6+126) = 582
|
|
; -696 -- move+draw 4*(16+26+6+126) = 696
|
|
; -10 -- keypress
|
|
;=======
|
|
; 3262
|
|
|
|
pad_time:
|
|
|
|
; we erase, then draw
|
|
; doing a blanket erase of all 128 lines would cost 3459 cycles!
|
|
|
|
;=========================
|
|
; ERASE
|
|
;=========================
|
|
|
|
lda #$00 ; 2
|
|
sta smc_raster_color1_1+1 ; 4
|
|
sta smc_raster_color1_2+1 ; 4
|
|
sta smc_raster_color2_1+1 ; 4
|
|
sta smc_raster_color2_2+1 ; 4
|
|
sta smc_raster_color3_1+1 ; 4
|
|
;=============
|
|
; 22
|
|
|
|
; erase red
|
|
|
|
lda red_x ; 4
|
|
and #$7f ; 2
|
|
tax ; 2
|
|
|
|
jsr draw_rasterbar ; 6+126
|
|
|
|
; erase yellow
|
|
|
|
lda yellow_x ; 4
|
|
and #$7f ; 2
|
|
tax ; 2
|
|
|
|
jsr draw_rasterbar ; 6+126
|
|
|
|
; erase green
|
|
|
|
lda green_x ; 4
|
|
and #$7f ; 2
|
|
tax ; 2
|
|
|
|
jsr draw_rasterbar ; 6+126
|
|
|
|
; erase red
|
|
|
|
lda blue_x ; 4
|
|
and #$7f ; 2
|
|
tax ; 2
|
|
|
|
jsr draw_rasterbar ; 6+126
|
|
|
|
|
|
;=========================
|
|
; MOVE and DRAW
|
|
;=========================
|
|
|
|
|
|
;============
|
|
; move red
|
|
|
|
ldy red_x ; 4
|
|
lda movement_table,Y ; 4
|
|
sta red_x ; 4
|
|
and #$7f ; 2
|
|
tax ; 2
|
|
;==========
|
|
; 16
|
|
|
|
; draw red
|
|
|
|
lda #$33 ; 2
|
|
sta smc_raster_color1_1+1 ; 4
|
|
sta smc_raster_color1_2+1 ; 4
|
|
lda #$bb ; 2
|
|
sta smc_raster_color2_1+1 ; 4
|
|
sta smc_raster_color2_2+1 ; 4
|
|
lda #$ff ; 2
|
|
sta smc_raster_color3_1+1 ; 4
|
|
;=============
|
|
; 26
|
|
|
|
|
|
jsr draw_rasterbar ; 6+126
|
|
|
|
|
|
;============
|
|
; move yellow
|
|
|
|
ldy yellow_x ; 4
|
|
lda movement_table,Y ; 4
|
|
sta yellow_x ; 4
|
|
and #$7f ; 2
|
|
tax ; 2
|
|
;==========
|
|
; 16
|
|
|
|
; draw yellow
|
|
|
|
lda #$88 ; 2
|
|
sta smc_raster_color1_1+1 ; 4
|
|
sta smc_raster_color1_2+1 ; 4
|
|
lda #$dd ; 2
|
|
sta smc_raster_color2_1+1 ; 4
|
|
sta smc_raster_color2_2+1 ; 4
|
|
lda #$ff ; 2
|
|
sta smc_raster_color3_1+1 ; 4
|
|
;=============
|
|
; 26
|
|
|
|
|
|
jsr draw_rasterbar ; 6+126
|
|
|
|
;============
|
|
; move green
|
|
|
|
ldy green_x ; 4
|
|
lda movement_table,Y ; 4
|
|
sta green_x ; 4
|
|
and #$7f ; 2
|
|
tax ; 2
|
|
;==========
|
|
; 16
|
|
|
|
; draw green
|
|
|
|
lda #$44 ; 2
|
|
sta smc_raster_color1_1+1 ; 4
|
|
sta smc_raster_color1_2+1 ; 4
|
|
lda #$cc ; 2
|
|
sta smc_raster_color2_1+1 ; 4
|
|
sta smc_raster_color2_2+1 ; 4
|
|
lda #$ff ; 2
|
|
sta smc_raster_color3_1+1 ; 4
|
|
;=============
|
|
; 26
|
|
|
|
|
|
jsr draw_rasterbar ; 6+126
|
|
|
|
;============
|
|
; move blue
|
|
|
|
ldy blue_x ; 4
|
|
lda movement_table,Y ; 4
|
|
sta blue_x ; 4
|
|
and #$7f ; 2
|
|
tax ; 2
|
|
;==========
|
|
; 16
|
|
|
|
; draw blue
|
|
|
|
lda #$22 ; 2
|
|
sta smc_raster_color1_1+1 ; 4
|
|
sta smc_raster_color1_2+1 ; 4
|
|
lda #$66 ; 2
|
|
sta smc_raster_color2_1+1 ; 4
|
|
sta smc_raster_color2_2+1 ; 4
|
|
lda #$ff ; 2
|
|
sta smc_raster_color3_1+1 ; 4
|
|
;=============
|
|
; 26
|
|
|
|
|
|
jsr draw_rasterbar ; 6+126
|
|
|
|
|
|
|
|
|
|
;============================
|
|
; WAIT for VBLANK to finish
|
|
;============================
|
|
; Try X=5 Y=105 cycles=3256 R6
|
|
|
|
nop
|
|
nop
|
|
nop
|
|
|
|
ldy #105 ; 2
|
|
loop1: ldx #5 ; 2
|
|
loop2: dex ; 2
|
|
bne loop2 ; 2nt/3
|
|
dey ; 2
|
|
bne loop1 ; 2nt/3
|
|
|
|
|
|
lda KEYPRESS ; 4
|
|
bpl no_keypress ; 3
|
|
jmp display_loop
|
|
no_keypress:
|
|
|
|
jmp display_loop ; 3
|
|
|
|
|
|
;========================
|
|
; Draw a rasterbar
|
|
; unroll as memory is free! haha
|
|
;========================
|
|
; X is location
|
|
|
|
; 2+22+24+24+24+24+6 = 126
|
|
|
|
draw_rasterbar:
|
|
|
|
ldy #0 ; 2
|
|
;====
|
|
|
|
lda y_lookup_l,X ; 4
|
|
sta OUTL ; 3
|
|
lda y_lookup_h,X ; 4
|
|
sta OUTH ; 3
|
|
|
|
smc_raster_color1_1:
|
|
lda #$33 ; 2
|
|
sta (OUTL),Y ; 6
|
|
;============
|
|
; 22
|
|
|
|
inx ; 2
|
|
lda y_lookup_l,X ; 4
|
|
sta OUTL ; 3
|
|
lda y_lookup_h,X ; 4
|
|
sta OUTH ; 3
|
|
|
|
smc_raster_color2_1:
|
|
lda #$bb ; 2
|
|
sta (OUTL),Y ; 6
|
|
|
|
inx ; 2
|
|
lda y_lookup_l,X ; 4
|
|
sta OUTL ; 3
|
|
lda y_lookup_h,X ; 4
|
|
sta OUTH ; 3
|
|
|
|
smc_raster_color3_1:
|
|
lda #$ff ; 2
|
|
sta (OUTL),Y ; 6
|
|
|
|
inx
|
|
lda y_lookup_l,X ; 4
|
|
sta OUTL ; 3
|
|
lda y_lookup_h,X ; 4
|
|
sta OUTH ; 3
|
|
|
|
smc_raster_color2_2:
|
|
lda #$bb ; 2
|
|
sta (OUTL),Y ; 6
|
|
|
|
inx
|
|
lda y_lookup_l,X ; 4
|
|
sta OUTL ; 3
|
|
lda y_lookup_h,X ; 4
|
|
sta OUTH ; 3
|
|
|
|
smc_raster_color1_2:
|
|
lda #$33 ; 2
|
|
sta (OUTL),Y ; 6
|
|
|
|
rts ; 6
|
|
|
|
|
|
|
|
|
|
.include "gr_simple_clear.s"
|
|
.include "gr_offsets.s"
|
|
|
|
.include "../asm_routines/gr_unrle.s"
|
|
.include "../asm_routines/keypress.s"
|
|
.align $100
|
|
.include "rasterbars_table.s"
|
|
.include "movement_table.s"
|
|
.include "gr_copy.s"
|
|
.include "vapor_lock.s"
|
|
.include "delay_a.s"
|
|
|
|
pictures:
|
|
.word rb_bg_low,rb_bg_high
|
|
|
|
.include "rb_bg.inc"
|
|
|
|
red_x: .byte $10
|
|
yellow_x: .byte $20
|
|
green_x: .byte $30
|
|
blue_x: .byte $40
|