dos33fsprogs/interlace_demo/rasterbars.s

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ArmAsm
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; 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
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OUTL = $FE
OUTH = $FF
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; 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
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sta WHICH
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;=============================
; Load graphic page0
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lda #$0c
sta BASH
lda #$00
sta BASL ; load image to $c00
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lda WHICH
asl
asl ; which*4
tay
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lda pictures,Y
sta GBASL
lda pictures+1,Y
sta GBASH
jsr load_rle_gr
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lda #4
sta DRAW_PAGE
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jsr gr_copy_to_current ; copy to page1
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; GR part
bit PAGE1
bit LORES ; 4
bit SET_GR ; 4
bit FULLGR ; 4
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; jsr wait_until_keypressed
;=============================
; Load graphic page1
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lda #$0c
sta BASH
lda #$00
sta BASL ; load image to $c00
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lda WHICH
asl
asl ; which*4
tay
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lda pictures+2,Y
sta GBASL
lda pictures+3,Y
sta GBASH
jsr load_rle_gr
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lda #0
sta DRAW_PAGE
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jsr gr_copy_to_current
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; ; GR part
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bit PAGE0
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; 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
;======================================================
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; 4550 -- VBLANK
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; -582 -- erase 22+4*(8+6+126) = 582
; -696 -- move+draw 4*(16+26+6+126) = 696
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; -10 -- keypress
;=======
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; 3262
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pad_time:
; we erase, then draw
; doing a blanket erase of all 128 lines would cost 3459 cycles!
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;=========================
; ERASE
;=========================
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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
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; erase red
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lda red_x ; 4
and #$7f ; 2
tax ; 2
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jsr draw_rasterbar ; 6+126
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; 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
;=========================
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;============
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; move red
ldy red_x ; 4
lda movement_table,Y ; 4
sta red_x ; 4
and #$7f ; 2
tax ; 2
;==========
; 16
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; draw red
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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
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;============
; move yellow
ldy yellow_x ; 4
lda movement_table,Y ; 4
sta yellow_x ; 4
and #$7f ; 2
tax ; 2
;==========
; 16
; draw yellow
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lda #$88 ; 2
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sta smc_raster_color1_1+1 ; 4
sta smc_raster_color1_2+1 ; 4
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lda #$dd ; 2
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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
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lda #$44 ; 2
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sta smc_raster_color1_1+1 ; 4
sta smc_raster_color1_2+1 ; 4
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lda #$cc ; 2
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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
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lda #$22 ; 2
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sta smc_raster_color1_1+1 ; 4
sta smc_raster_color1_2+1 ; 4
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lda #$66 ; 2
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sta smc_raster_color2_1+1 ; 4
sta smc_raster_color2_2+1 ; 4
lda #$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
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nop
nop
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ldy #105 ; 2
loop1: ldx #5 ; 2
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loop2: dex ; 2
bne loop2 ; 2nt/3
dey ; 2
bne loop1 ; 2nt/3
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lda KEYPRESS ; 4
bpl no_keypress ; 3
jmp display_loop
no_keypress:
jmp display_loop ; 3
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;========================
; Draw a rasterbar
; unroll as memory is free! haha
;========================
; X is location
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; 2+22+24+24+24+24+6 = 126
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draw_rasterbar:
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ldy #0 ; 2
;====
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lda y_lookup_l,X ; 4
sta OUTL ; 3
lda y_lookup_h,X ; 4
sta OUTH ; 3
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smc_raster_color1_1:
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lda #$33 ; 2
sta (OUTL),Y ; 6
;============
; 22
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inx ; 2
lda y_lookup_l,X ; 4
sta OUTL ; 3
lda y_lookup_h,X ; 4
sta OUTH ; 3
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smc_raster_color2_1:
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lda #$bb ; 2
sta (OUTL),Y ; 6
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inx ; 2
lda y_lookup_l,X ; 4
sta OUTL ; 3
lda y_lookup_h,X ; 4
sta OUTH ; 3
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smc_raster_color3_1:
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lda #$ff ; 2
sta (OUTL),Y ; 6
inx
lda y_lookup_l,X ; 4
sta OUTL ; 3
lda y_lookup_h,X ; 4
sta OUTH ; 3
smc_raster_color2_2:
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lda #$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:
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lda #$33 ; 2
sta (OUTL),Y ; 6
rts ; 6
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.include "gr_simple_clear.s"
.include "gr_offsets.s"
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.include "../asm_routines/gr_unrle.s"
.include "../asm_routines/keypress.s"
.align $100
.include "rasterbars_table.s"
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.include "movement_table.s"
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.include "gr_copy.s"
.include "vapor_lock.s"
.include "delay_a.s"
pictures:
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.word rb_bg_low,rb_bg_high
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.include "rb_bg.inc"
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red_x: .byte $10
yellow_x: .byte $20
green_x: .byte $30
blue_x: .byte $40