mirror of
https://github.com/deater/dos33fsprogs.git
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mode7_demo: move all code into one dir
if I mess around with common asm_routines it will mess with the size optimized demo. So lock in place the files and make a copy here. Should have done this once when I was prepping the PoC||GTFO code.
This commit is contained in:
Vince Weaver
parent
517a7600a2
commit
60c3137e62
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@ -36,12 +36,12 @@ MODE7_DEMO: mode7_demo.o
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mode7_demo.o: mode7_demo.s mode7_demo_backgrounds.inc sprites.inc \
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a2.scrolltext deater.scrolltext wave.krg \
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../asm_routines/gr_unrle.s \
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../asm_routines/gr_fast_clear.s \
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gr_unrle.s \
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gr_fast_clear.s \
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gr_setpage.s \
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../asm_routines/gr_fade.s \
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../asm_routines/gr_copy.s \
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../asm_routines/gr_scroll.s \
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gr_fade.s \
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gr_copy.s \
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gr_scroll.s \
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mockingboard.s \
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credits.s mode7.s rasterbars.s starfield_demo.s \
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interrupt_handler.s \
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79
mode7_demo/bg_scroll.s
Normal file
79
mode7_demo/bg_scroll.s
Normal file
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@ -0,0 +1,79 @@
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;==================
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; scroll background
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;==================
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; background already loaded
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; ANGLE 0-15 sets angle
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; CV is Y position to display at
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; 182/220... 220/16 = 13.75
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; 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
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; 0 11 22 34 45 56 68 79 91 102 113 125 136 147 159 170 182
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scroll_offsets:
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.byte 0,11,22,34,45,56,68,79,91,102,113,125,136,147,159,170
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scroll_background:
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ldy ANGLE ; use angle
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lda scroll_offsets,Y ; lookup in table
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sta OFFSET ; calculate offset
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ldx #0
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ldy CV ; lookup Y co-ord
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lsr ; and set up self-modify code
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lda gr_offsets,Y ; get position
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sta bgsm1+1
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lda gr_offsets+2,Y ; get position
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sta bgsm2+1
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lda gr_offsets+4,Y ; get position
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sta bgsm3+1
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lda gr_offsets+6,Y ; get position
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sta bgsm4+1
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iny
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clc
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lda gr_offsets,Y ; get position
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adc DRAW_PAGE
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sta bgsm1+2
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lda gr_offsets+2,Y ; get position
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adc DRAW_PAGE
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sta bgsm2+2
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lda gr_offsets+4,Y ; get position
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adc DRAW_PAGE
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sta bgsm3+2
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lda gr_offsets+6,Y ; get position
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adc DRAW_PAGE
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sta bgsm4+2
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ldy OFFSET
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bgdraw_loop:
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lda scroll_row1,Y
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bgsm1:
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sta $400,X
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lda scroll_row2,Y
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bgsm2:
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sta $480,X
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lda scroll_row3,Y
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bgsm3:
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sta $500,X
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lda scroll_row4,Y
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bgsm4:
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sta $580,X
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iny
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inx
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cpx #40
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bne bgdraw_loop
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rts
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53
mode7_demo/gr_copy.s
Normal file
53
mode7_demo/gr_copy.s
Normal file
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@ -0,0 +1,53 @@
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;=========================================================
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; gr_copy_to_current
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;=========================================================
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; copy 0xc00 to DRAW_PAGE
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; ORIGINAL: 2 + 8*38 + 4*80*23 + 4*120*26 + 13 = 20,159 = 20ms = 50Hz
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;
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; OPTIMIZED: 2+ 8*38 + 9*4 + 7*4 + 14*120*4 + 14*80*4 + 9*8 + 6 =
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; 11,648 = 11ms = 90Hz
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gr_copy_to_current:
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ldx #0 ; set ypos to zero ; 2
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gr_copy_loop:
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lda gr_offsets,X ; lookup low byte for line addr ; 4+
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sta gr_copy_line+1 ; out and in are the same ; 4
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sta gr_copy_line+4 ; 4
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lda gr_offsets+1,X ; lookup high byte for line addr ; 4+
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clc ; 2
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adc DRAW_PAGE ; 3
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sta gr_copy_line+5 ; 4
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lda gr_offsets+1,X ; lookup high byte for line addr ; 4+
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adc #$8 ; for now, fixed 0xc ; 2
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sta gr_copy_line+2 ; 4
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ldy #0 ; set xpos counter to 0 ; 2
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cpx #$8 ; don't want to copy bottom 4*40 ; 2
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bcs gr_copy_above4 ; 2nt/3
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gr_copy_below4:
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ldy #119 ; for early ones, copy 120 bytes ; 2
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bcc gr_copy_line ; ; 3
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gr_copy_above4: ; for last four, just copy 80 bytes
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ldy #79 ; 2
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gr_copy_line:
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lda $ffff,Y ; load a byte (self modified) ; 4+
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sta $ffff,Y ; store a byte (self modified) ; 5
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dey ; decrement pointer ; 2
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bpl gr_copy_line ; ; 2nt/3
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gr_copy_line_done:
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inx ; increment ypos value ; 2
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inx ; twice, as address is 2 bytes ; 2
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cpx #16 ; there are 8*2 of them ; 2
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bne gr_copy_loop ; if not, loop ; 3
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rts ; 6
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191
mode7_demo/gr_fade.s
Normal file
191
mode7_demo/gr_fade.s
Normal file
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@ -0,0 +1,191 @@
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;============================================
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; gr, "fade" out. Badly fake a pallette fade
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;============================================
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; Image to fade out should be in $C00
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fade_out:
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lda #<fade_lookup
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sta GBASL
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lda #>fade_lookup
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sta GBASH
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jsr gr_fade
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jsr page_flip
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lda #200
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jsr WAIT
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lda #<(fade_lookup+16)
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sta GBASL
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lda #>(fade_lookup+16)
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sta GBASH
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jsr gr_fade
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jsr page_flip
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lda #200
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jsr WAIT
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lda #<(fade_lookup+32)
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sta GBASL
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lda #>(fade_lookup+32)
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sta GBASH
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jsr gr_fade
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jsr page_flip
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lda #200
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jsr WAIT
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lda #<(fade_lookup+48)
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sta GBASL
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lda #>(fade_lookup+48)
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sta GBASH
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jsr gr_fade
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jsr page_flip
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lda #200
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jsr WAIT
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rts
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;===========================================
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; gr, "fade" in. Badly fake a pallette fade
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;===========================================
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; Image to fade in should be in $C00
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fade_in:
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lda #<(fade_lookup+48)
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sta GBASL
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lda #>(fade_lookup+48)
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sta GBASH
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jsr gr_fade
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jsr page_flip
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lda #200
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jsr WAIT
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lda #<(fade_lookup+32)
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sta GBASL
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lda #>(fade_lookup+32)
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sta GBASH
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jsr gr_fade
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jsr page_flip
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lda #200
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jsr WAIT
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lda #<(fade_lookup+16)
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sta GBASL
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lda #>(fade_lookup+16)
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sta GBASH
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jsr gr_fade
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jsr page_flip
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lda #200
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jsr WAIT
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lda #<(fade_lookup+0)
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sta GBASL
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lda #>(fade_lookup+0)
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sta GBASH
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jsr gr_fade
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jsr page_flip
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lda #200
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jsr WAIT
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rts
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;================================================
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; Fade in/out lowres graphics
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; GR image should be in $C00
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; pointer to fade table in GBASL/GBASH
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gr_fade:
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ldx #0 ; set ypos to zero ; 2
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gr_fade_loop:
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lda gr_offsets,X ; lookup low byte for line addr ; 4+
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sta gr_fade_line1+1 ; out and in are the same ; 4
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sta gr_fade_line2+1 ; 4
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lda gr_offsets+1,X ; lookup high byte for line addr ; 4+
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clc ; 2
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adc DRAW_PAGE ; 3
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sta gr_fade_line2+2 ; 4
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lda gr_offsets+1,X ; lookup high byte for line addr ; 4+
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adc #$8 ; for now, fixed 0xc ; 2
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sta gr_fade_line1+2 ; 4
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ldy #0 ; set xpos counter to 0 ; 2
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cpx #$8 ; don't want to copy bottom 4*40 ; 2
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bcs gr_fade_above4 ; 2nt/3
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gr_fade_below4:
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ldy #119 ; for early ones, copy 120 bytes ; 2
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bcc gr_fade_line1 ; ; 3
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gr_fade_above4: ; for last four, just copy 80 bytes
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ldy #79 ; 2
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gr_fade_line1:
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lda $ffff,Y ; load a byte (self modified) ; 4+
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pha
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sty TEMPY ; save Y
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; do high nibble
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and #$f0
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lsr
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lsr
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lsr
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lsr
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tay
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lda (GBASL),Y
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and #$f0
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sta TEMP
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; do low nibble
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pla
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and #$0f
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tay
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lda (GBASL),Y
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and #$0f
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ora TEMP
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ldy TEMPY ; restore Y
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gr_fade_line2:
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sta $ffff,Y ; store a byte (self modified) ; 5
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dey ; decrement pointer ; 2
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bpl gr_fade_line1 ; ; 2nt/3
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gr_fade_line_done:
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inx ; increment ypos value ; 2
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inx ; twice, as address is 2 bytes ; 2
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cpx #16 ; there are 8*2 of them ; 2
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bne gr_fade_loop ; if not, loop ; 3
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rts ; 6
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; Fade paramaters
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fade_lookup:
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.byte $00,$11,$22,$33,$44,$55,$66,$77, $88,$99,$aa,$bb,$cc,$dd,$ee,$ff
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.byte $00,$00,$00,$22,$00,$00,$22,$55, $55,$88,$55,$33,$44,$88,$44,$77
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.byte $00,$00,$00,$00,$00,$00,$55,$00, $00,$00,$00,$00,$88,$00,$00,$55
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.byte $00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00
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192
mode7_demo/gr_fast_clear.s
Normal file
192
mode7_demo/gr_fast_clear.s
Normal file
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@ -0,0 +1,192 @@
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clear_screens:
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;===================================
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; Clear top/bottom of page 0
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;===================================
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lda #$0
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sta DRAW_PAGE
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jsr clear_top
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jsr clear_bottom
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;===================================
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; Clear top/bottom of page 1
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;===================================
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lda #$4
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sta DRAW_PAGE
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jsr clear_top
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jsr clear_bottom
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rts
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clear_bottoms:
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;===================================
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; Clear bottom of page 0
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;===================================
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lda #$0
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sta DRAW_PAGE
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jsr clear_bottom
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;===================================
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; Clear bottom of page 1
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;===================================
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lda #$4
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sta DRAW_PAGE
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jsr clear_bottom
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rts
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;=========================================================
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; clear_top
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;=========================================================
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; clear DRAW_PAGE
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; original = 14,558 cycles(?) 15ms, 70Hz
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; OPTIMIZED MAX (page0,48rows): 45*120+4+6 = 5410 = 5.4ms 185Hz
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; (pageX,40rows): 50*120+4+6 = 6010 = 6.0ms 166Hz
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; 50*120+4+6+37 = 6055 = 6.0ms 166Hz
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clear_top:
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lda #0 ; 2
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clear_top_a:
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sta COLOR ; 3
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clc ; 2
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lda DRAW_PAGE ; 3
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adc #4 ; 2
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sta __ctf+2 ; 3
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sta __ctf+5 ; 3
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adc #1 ; 2
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sta __ctf+8 ; 3
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sta __ctf+11 ; 3
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adc #1 ; 2
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sta __ctf2+2 ; 3
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sta __ctf2+5 ; 3
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adc #1 ; 2
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sta __ctf2+8 ; 3
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sta __ctf2+11 ; 3
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ldy #120 ; 2
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lda COLOR ; 3
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clear_top_fast_loop:
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__ctf:
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sta $400,Y ; 5
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sta $480,Y ; 5
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sta $500,Y ; 5
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sta $580,Y ; 5
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cpy #80 ; 2
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bpl no_draw_bottom ; 2nt/3
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__ctf2:
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sta $600,Y ; 5
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sta $680,Y ; 5
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sta $700,Y ; 5
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sta $780,Y ; 5
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no_draw_bottom:
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dey ; 2
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bpl clear_top_fast_loop ; 2nt/3
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rts ; 6
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;=========================================================
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; clear_bottom
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;=========================================================
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; clear bottom of draw page
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clear_bottom:
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clc ; 2
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lda DRAW_PAGE ; 3
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adc #6 ; 2
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sta __cbf2+2 ; 3
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sta __cbf2+5 ; 3
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adc #1 ; 2
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sta __cbf2+8 ; 3
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sta __cbf2+11 ; 3
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ldy #120 ; 2
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lda #$a0 ; Normal Space ; 2
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clear_bottom_fast_loop:
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__cbf2:
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sta $600,Y ; 5
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sta $680,Y ; 5
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sta $700,Y ; 5
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sta $780,Y ; 5
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dey ; 2
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cpy #80 ; 2
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bpl clear_bottom_fast_loop ; 2nt/3
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rts ; 6
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clear_screens_notext:
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;===================================
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; Clear top/bottom of page 0
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;===================================
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lda #$0
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sta DRAW_PAGE
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jsr clear_all
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;===================================
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; Clear top/bottom of page 1
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;===================================
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lda #$4
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sta DRAW_PAGE
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jsr clear_all
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rts
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;=========================================================
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; clear_all
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;=========================================================
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; clear 48 rows
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clear_all:
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clc ; 2
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lda DRAW_PAGE ; 3
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adc #4 ; 2
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sta __caf+2 ; 3
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sta __caf+5 ; 3
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adc #1 ; 2
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sta __caf+8 ; 3
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sta __caf+11 ; 3
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adc #1 ; 2
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sta __caf2+2 ; 3
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sta __caf2+5 ; 3
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adc #1 ; 2
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sta __caf2+8 ; 3
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sta __caf2+11 ; 3
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ldy #120 ; 2
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clear_all_color:
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lda #0 ; 2
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clear_all_fast_loop:
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__caf:
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sta $400,Y ; 5
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sta $480,Y ; 5
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sta $500,Y ; 5
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sta $580,Y ; 5
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__caf2:
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sta $600,Y ; 5
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sta $680,Y ; 5
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sta $700,Y ; 5
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sta $780,Y ; 5
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dey ; 2
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bpl clear_all_fast_loop ; 2nt/3
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rts ; 6
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67
mode7_demo/gr_hlin_double.s
Normal file
67
mode7_demo/gr_hlin_double.s
Normal file
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@ -0,0 +1,67 @@
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|||
;=====================================================================
|
||||
;= ROUTINES
|
||||
;=====================================================================
|
||||
|
||||
;================================
|
||||
; hlin_setup
|
||||
;================================
|
||||
; put address in GBASL/GBASH
|
||||
; Ycoord in A, Xcoord in Y
|
||||
hlin_setup:
|
||||
sty TEMPY ; 3
|
||||
tay ; y=A ; 2
|
||||
lda gr_offsets,Y ; lookup low-res memory address ; 4
|
||||
clc ; 2
|
||||
adc TEMPY ; 3
|
||||
sta GBASL ; 3
|
||||
iny ; 2
|
||||
|
||||
lda gr_offsets,Y ; 4
|
||||
adc DRAW_PAGE ; add in draw page offset ; 3
|
||||
sta GBASH ; 3
|
||||
rts ; 6
|
||||
;===========
|
||||
; 35
|
||||
;================================
|
||||
; hlin_double:
|
||||
;================================
|
||||
; HLIN Y, V2 AT A
|
||||
; Y, X, A trashed
|
||||
; start at Y, draw up to and including X
|
||||
hlin_double:
|
||||
;int hlin_double(int page, int x1, int x2, int at) {
|
||||
|
||||
jsr hlin_setup ; 41
|
||||
|
||||
sec ; 2
|
||||
lda V2 ; 3
|
||||
sbc TEMPY ; 3
|
||||
|
||||
tax ; 2
|
||||
inx ; 2
|
||||
;===========
|
||||
; 53
|
||||
; fallthrough
|
||||
|
||||
;=================================
|
||||
; hlin_double_continue: width
|
||||
;=================================
|
||||
; GBASL has correct offset for row/col
|
||||
; width in X
|
||||
|
||||
hlin_double_continue:
|
||||
|
||||
ldy #0 ; 2
|
||||
lda COLOR ; 3
|
||||
hlin_double_loop:
|
||||
sta (GBASL),Y ; 6
|
||||
inc GBASL ; 5
|
||||
dex ; 2
|
||||
bne hlin_double_loop ; 2nt/3
|
||||
|
||||
rts ; 6
|
||||
;=============
|
||||
; 53+5+X*16+5
|
||||
|
||||
|
||||
|
||||
5
mode7_demo/gr_offsets.s
Normal file
5
mode7_demo/gr_offsets.s
Normal file
|
|
@ -0,0 +1,5 @@
|
|||
; move these to zero page for slight speed increase?
|
||||
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,$7d0
|
||||
48
mode7_demo/gr_plot.s
Normal file
48
mode7_demo/gr_plot.s
Normal file
|
|
@ -0,0 +1,48 @@
|
|||
;================================
|
||||
; plot routine
|
||||
;================================
|
||||
; Xcoord in XPOS
|
||||
; Ycoord in YPOS
|
||||
; color in COLOR
|
||||
plot:
|
||||
lda YPOS ; 2
|
||||
|
||||
lsr ; shift bottom bit into carry ; 2
|
||||
|
||||
bcc plot_even ; 2nt/3
|
||||
plot_odd:
|
||||
ldx #$f0 ; 2
|
||||
bcs plot_c_done ; 2nt/3
|
||||
plot_even:
|
||||
ldx #$0f ; 2
|
||||
plot_c_done:
|
||||
stx MASK ; 3
|
||||
|
||||
asl ; shift back (now even) ; 2
|
||||
tay
|
||||
|
||||
lda gr_offsets,Y ; lookup low-res memory address ; 4
|
||||
clc ; 2
|
||||
adc XPOS ; 3
|
||||
sta GBASL ; 3
|
||||
iny ; 2
|
||||
|
||||
lda gr_offsets,Y ; 4
|
||||
adc DRAW_PAGE ; add in draw page offset ; 3
|
||||
sta GBASH ; 3
|
||||
|
||||
ldy #0 ; 2
|
||||
|
||||
plot_write:
|
||||
lda MASK ; 3
|
||||
eor #$ff ; 2
|
||||
|
||||
and (GBASL),Y ; 5
|
||||
sta COLOR_MASK ; 3
|
||||
|
||||
lda COLOR ; 3
|
||||
and MASK ; 3
|
||||
ora COLOR_MASK ; 3
|
||||
sta (GBASL),Y ; 5
|
||||
|
||||
rts ; 6
|
||||
101
mode7_demo/gr_putsprite.s
Normal file
101
mode7_demo/gr_putsprite.s
Normal file
|
|
@ -0,0 +1,101 @@
|
|||
;=============================================
|
||||
; put_sprite
|
||||
;=============================================
|
||||
; Sprite to display in INH,INL
|
||||
; Location is XPOS,YPOS
|
||||
; Note, only works if YPOS is multiple of two?
|
||||
|
||||
put_sprite:
|
||||
|
||||
ldy #0 ; byte 0 is xsize ; 2
|
||||
lda (INL),Y ; 5
|
||||
sta CH ; xsize is in CH ; 3
|
||||
iny ; 2
|
||||
|
||||
lda (INL),Y ; byte 1 is ysize ; 5
|
||||
sta CV ; ysize is in CV ; 3
|
||||
iny ; 2
|
||||
|
||||
lda YPOS ; make a copy of ypos ; 3
|
||||
sta TEMPY ; as we modify it ; 3
|
||||
;===========
|
||||
; 28
|
||||
put_sprite_loop:
|
||||
sty TEMP ; save sprite pointer ; 3
|
||||
|
||||
ldy TEMPY ; 3
|
||||
lda gr_offsets,Y ; lookup low-res memory address ; 5
|
||||
clc ; 2
|
||||
adc XPOS ; add in xpos ; 3
|
||||
sta OUTL ; store out low byte of addy ; 3
|
||||
lda gr_offsets+1,Y ; look up high byte ; 5
|
||||
adc DRAW_PAGE ; ; 3
|
||||
sta OUTH ; and store it out ; 3
|
||||
ldy TEMP ; restore sprite pointer ; 3
|
||||
|
||||
; OUTH:OUTL now points at right place
|
||||
|
||||
ldx CH ; load xsize into x ; 3
|
||||
;===========
|
||||
; 36
|
||||
put_sprite_pixel:
|
||||
lda (INL),Y ; get sprite colors ; 5
|
||||
iny ; increment sprite pointer ; 2
|
||||
|
||||
sty TEMP ; save sprite pointer ; 3
|
||||
ldy #$0 ; 2
|
||||
|
||||
; check if completely transparent
|
||||
; if so, skip
|
||||
|
||||
cmp #$0 ; if all zero, transparent ; 2
|
||||
beq put_sprite_done_draw ; don't draw it ; 2nt/3
|
||||
; FIXME: use BIT? ;==============
|
||||
; 17
|
||||
|
||||
sta COLOR ; save color for later ; 3
|
||||
|
||||
; check if top pixel transparent
|
||||
|
||||
and #$f0 ; check if top nibble zero ; 2
|
||||
bne put_sprite_bottom ; if not skip ahead ; 2nt/3
|
||||
|
||||
lda #$f0 ; setup mask ; 2
|
||||
sta MASK ; 3
|
||||
bmi put_sprite_mask ; 2nt/3
|
||||
|
||||
put_sprite_bottom:
|
||||
lda COLOR ; re-load color ; 3
|
||||
and #$0f ; check if bottom nibble zero ; 2
|
||||
bne put_sprite_all ; if not, skip ahead ; 2nt/3
|
||||
lda #$0f ; 2
|
||||
sta MASK ; setup mask ; 3
|
||||
|
||||
put_sprite_mask:
|
||||
lda (OUTL),Y ; get color at output ; 5
|
||||
and MASK ; mask off unneeded part ; 3
|
||||
ora COLOR ; or the color in ; 3
|
||||
sta (OUTL),Y ; store it back ; 5
|
||||
|
||||
jmp put_sprite_done_draw ; we are done ; 3
|
||||
|
||||
put_sprite_all:
|
||||
lda COLOR ; load color ; 3
|
||||
sta (OUTL),Y ; and write it out ; 5
|
||||
|
||||
|
||||
put_sprite_done_draw:
|
||||
|
||||
ldy TEMP ; restore sprite pointer ; 3
|
||||
|
||||
inc OUTL ; increment output pointer ; 5
|
||||
dex ; decrement x counter ; 2
|
||||
bne put_sprite_pixel ; if not done, keep looping ; 2nt/3
|
||||
|
||||
inc TEMPY ; each line has two y vars ; 5
|
||||
inc TEMPY ; 5
|
||||
dec CV ; decemenet total y count ; 5
|
||||
bne put_sprite_loop ; loop if not done ; 2nt/3
|
||||
|
||||
rts ; return ; 6
|
||||
|
||||
195
mode7_demo/gr_scroll.s
Normal file
195
mode7_demo/gr_scroll.s
Normal file
|
|
@ -0,0 +1,195 @@
|
|||
.ifndef scroll_row1
|
||||
scroll_row1 EQU $8A00
|
||||
scroll_row2 EQU $8B00
|
||||
scroll_row3 EQU $8C00
|
||||
scroll_row4 EQU $8D00
|
||||
.endif
|
||||
|
||||
SCROLL_LENGTH EQU $61
|
||||
OFFSET EQU $62
|
||||
|
||||
|
||||
;========================
|
||||
; scroll some text
|
||||
;========================
|
||||
; RLE compressed data in INL/INH
|
||||
; CV is Y position to display at
|
||||
|
||||
gr_scroll:
|
||||
lda #0
|
||||
sta OFFSET
|
||||
|
||||
;=======================
|
||||
; decompress scroll text
|
||||
;=======================
|
||||
|
||||
jsr decompress_scroll
|
||||
|
||||
|
||||
scroll_loop:
|
||||
|
||||
ldx #0
|
||||
|
||||
ldy CV
|
||||
lsr
|
||||
|
||||
lda gr_offsets,Y ; get position
|
||||
sta sm1+1
|
||||
lda gr_offsets+2,Y ; get position
|
||||
sta sm2+1
|
||||
lda gr_offsets+4,Y ; get position
|
||||
sta sm3+1
|
||||
lda gr_offsets+6,Y ; get position
|
||||
sta sm4+1
|
||||
|
||||
|
||||
iny
|
||||
|
||||
clc
|
||||
|
||||
lda gr_offsets,Y ; get position
|
||||
adc DRAW_PAGE
|
||||
sta sm1+2
|
||||
lda gr_offsets+2,Y ; get position
|
||||
adc DRAW_PAGE
|
||||
sta sm2+2
|
||||
lda gr_offsets+4,Y ; get position
|
||||
adc DRAW_PAGE
|
||||
sta sm3+2
|
||||
lda gr_offsets+6,Y ; get position
|
||||
adc DRAW_PAGE
|
||||
sta sm4+2
|
||||
|
||||
ldy OFFSET
|
||||
|
||||
draw_loop:
|
||||
|
||||
lda scroll_row1,Y
|
||||
sm1:
|
||||
sta $400,X
|
||||
|
||||
lda scroll_row2,Y
|
||||
sm2:
|
||||
sta $480,X
|
||||
|
||||
lda scroll_row3,Y
|
||||
sm3:
|
||||
sta $500,X
|
||||
|
||||
lda scroll_row4,Y
|
||||
sm4:
|
||||
sta $580,X
|
||||
|
||||
iny
|
||||
inx
|
||||
cpx #40
|
||||
bne draw_loop
|
||||
|
||||
;==================
|
||||
; flip pages
|
||||
;==================
|
||||
|
||||
jsr page_flip ; 6
|
||||
|
||||
;==================
|
||||
; delay
|
||||
;==================
|
||||
|
||||
lda #125
|
||||
jsr WAIT
|
||||
|
||||
|
||||
;==================
|
||||
; loop forever
|
||||
;==================
|
||||
clc
|
||||
lda OFFSET
|
||||
adc #40
|
||||
cmp SCROLL_LENGTH
|
||||
beq done_scrolling
|
||||
inc OFFSET
|
||||
jmp scroll_loop ; 3
|
||||
|
||||
done_scrolling:
|
||||
rts
|
||||
|
||||
;=======================
|
||||
; decompress scroll
|
||||
;=======================
|
||||
decompress_scroll:
|
||||
ldy #0
|
||||
jsr scroll_load_and_increment
|
||||
sta SCROLL_LENGTH
|
||||
|
||||
lda #<scroll_row1
|
||||
sta OUTL
|
||||
lda #>scroll_row1
|
||||
sta OUTH
|
||||
|
||||
decompress_scroll_loop:
|
||||
jsr scroll_load_and_increment ; load compressed value
|
||||
|
||||
cmp #$A1 ; EOF marker
|
||||
beq done_decompress_scroll ; if EOF, exit
|
||||
|
||||
pha ; save
|
||||
|
||||
and #$f0 ; mask
|
||||
cmp #$a0 ; see if special AX
|
||||
beq decompress_scroll_special
|
||||
|
||||
pla ; note, PLA sets flags!
|
||||
|
||||
ldx #$1 ; only want to print 1
|
||||
bne decompress_scroll_run
|
||||
|
||||
decompress_scroll_special:
|
||||
pla
|
||||
|
||||
and #$0f ; check if was A0
|
||||
|
||||
bne decompress_scroll_color ; if A0 need to read run, color
|
||||
|
||||
decompress_scroll_large:
|
||||
jsr scroll_load_and_increment ; get run length
|
||||
|
||||
decompress_scroll_color:
|
||||
tax ; put runlen into X
|
||||
jsr scroll_load_and_increment ; get color
|
||||
|
||||
decompress_scroll_run:
|
||||
sta (OUTL),Y
|
||||
pha
|
||||
|
||||
clc ; increment 16-bit pointer
|
||||
lda OUTL
|
||||
adc #$1
|
||||
sta OUTL
|
||||
lda OUTH
|
||||
adc #$0
|
||||
sta OUTH
|
||||
|
||||
pla
|
||||
|
||||
dex ; repeat for X times
|
||||
bne decompress_scroll_run
|
||||
|
||||
beq decompress_scroll_loop ; get next run
|
||||
|
||||
done_decompress_scroll:
|
||||
rts
|
||||
|
||||
|
||||
scroll_load_and_increment:
|
||||
lda (INL),Y ; load and increment 16-bit pointer
|
||||
pha
|
||||
clc
|
||||
lda INL
|
||||
adc #$1
|
||||
sta INL
|
||||
lda INH
|
||||
adc #$0
|
||||
sta INH
|
||||
pla
|
||||
rts
|
||||
|
||||
115
mode7_demo/gr_unrle.s
Normal file
115
mode7_demo/gr_unrle.s
Normal file
|
|
@ -0,0 +1,115 @@
|
|||
;=================
|
||||
; load RLE image
|
||||
;=================
|
||||
; Output is BASH/BASL
|
||||
; Input is in GBASH/GBASL
|
||||
load_rle_gr:
|
||||
lda #$0
|
||||
tay ; init Y to 0
|
||||
sta TEMP ; stores the xcoord
|
||||
|
||||
sta CV ; ycoord=0
|
||||
|
||||
jsr load_and_increment ; load xsize
|
||||
sta CH
|
||||
|
||||
rle_loop:
|
||||
jsr load_and_increment
|
||||
|
||||
cmp #$A1 ; if 0xa1
|
||||
beq rle_done ; we are done
|
||||
|
||||
pha
|
||||
|
||||
and #$f0 ; mask
|
||||
cmp #$a0 ; see if special AX
|
||||
beq decompress_special
|
||||
|
||||
pla ; note, PLA sets flags!
|
||||
|
||||
ldx #$1 ; only want to print 1
|
||||
bne decompress_run
|
||||
|
||||
decompress_special:
|
||||
pla
|
||||
|
||||
and #$0f ; check if was A0
|
||||
|
||||
bne decompress_color ; if A0 need to read run, color
|
||||
|
||||
decompress_large:
|
||||
jsr load_and_increment ; get run length
|
||||
|
||||
decompress_color:
|
||||
tax ; put runlen into X
|
||||
jsr load_and_increment ; get color
|
||||
|
||||
decompress_run:
|
||||
rle_run_loop:
|
||||
sta (BASL),y ; write out the value
|
||||
inc BASL ; increment the pointer
|
||||
bne rle_skip3 ; if wrapped
|
||||
inc BASH ; then increment the high value
|
||||
|
||||
rle_skip3:
|
||||
pha ; store colore for later
|
||||
|
||||
inc TEMP ; increment the X value
|
||||
lda TEMP
|
||||
cmp CH ; compare against the image width
|
||||
bcc rle_not_eol ; if less then keep going
|
||||
|
||||
lda BASL ; cheat to avoid a 16-bit add
|
||||
cmp #$a7 ; we are adding 0x58 to get
|
||||
bcc rle_add_skip ; to the next line
|
||||
inc BASH
|
||||
rle_add_skip:
|
||||
clc
|
||||
adc #$58 ; actually do the 0x58 add
|
||||
sta BASL ; and store it back
|
||||
|
||||
inc CV ; add 2 to ypos
|
||||
inc CV ; each "line" is two high
|
||||
|
||||
lda CV ; load value
|
||||
cmp #15 ; if it's greater than 14 it wraps
|
||||
bcc rle_no_wrap ; Thanks Woz
|
||||
|
||||
lda #$0 ; we wrapped, so set to zero
|
||||
sta CV
|
||||
|
||||
; when wrapping have to sub 0x3d8
|
||||
sec ; this is a 16-bit subtract routine
|
||||
lda BASL
|
||||
sbc #$d8 ; LSB
|
||||
sta BASL
|
||||
lda BASH ; MSB
|
||||
sbc #$3 ;
|
||||
sta BASH
|
||||
|
||||
rle_no_wrap:
|
||||
lda #$0 ; set X value back to zero
|
||||
sta TEMP
|
||||
|
||||
rle_not_eol:
|
||||
pla ; restore color
|
||||
dex
|
||||
bne rle_run_loop ; if not zero, keep looping
|
||||
beq rle_loop ; and branch always
|
||||
|
||||
rle_done:
|
||||
lda #$15 ; move the cursor somewhere sane
|
||||
sta CV
|
||||
rts
|
||||
|
||||
|
||||
load_and_increment:
|
||||
lda (GBASL),y ; load value ; 5?
|
||||
inc GBASL ; 5?
|
||||
bne lskip2 ; 2nt/3
|
||||
inc GBASH ; 5?
|
||||
lskip2:
|
||||
rts ; 6
|
||||
|
||||
|
||||
|
||||
|
|
@ -1160,8 +1160,8 @@ lookup_checkerboard_map:
|
|||
; External modules
|
||||
;===============================================
|
||||
|
||||
.include "../asm_routines/gr_putsprite.s"
|
||||
.include "../asm_routines/bg_scroll.s"
|
||||
.include "gr_putsprite.s"
|
||||
.include "bg_scroll.s"
|
||||
|
||||
.include "sprites.inc"
|
||||
|
||||
|
|
@ -1172,7 +1172,7 @@ lookup_checkerboard_map:
|
|||
.include "island_map.inc"
|
||||
.include "starry_sky.scroll"
|
||||
|
||||
.include "../asm_routines/multiply_fast.s"
|
||||
.include "multiply_fast.s"
|
||||
|
||||
|
||||
; 8.8 fixed point
|
||||
|
|
|
|||
|
|
@ -330,11 +330,11 @@ title_routine:
|
|||
.byte 0,0,0,0
|
||||
.byte $A0,$55,$26,$55,$81 ; at $4800
|
||||
|
||||
.include "../asm_routines/pageflip.s"
|
||||
.include "pageflip.s"
|
||||
.include "rasterbars.s"
|
||||
.include "starfield_demo.s"
|
||||
.include "../asm_routines/gr_unrle.s"
|
||||
.include "../asm_routines/gr_offsets.s"
|
||||
.include "gr_unrle.s"
|
||||
.include "gr_offsets.s"
|
||||
.include "gr_setpage.s"
|
||||
.byte 0,0,0,0,0,0,0,0
|
||||
.byte 0,0,0,0,0,0,0,0
|
||||
|
|
@ -345,13 +345,13 @@ title_routine:
|
|||
;===============================================
|
||||
|
||||
|
||||
.include "../asm_routines/gr_fast_clear.s"
|
||||
.include "../asm_routines/gr_hlin_double.s"
|
||||
.include "../asm_routines/text_print.s"
|
||||
.include "../asm_routines/gr_fade.s"
|
||||
.include "../asm_routines/gr_plot.s"
|
||||
.include "../asm_routines/gr_copy.s"
|
||||
.include "../asm_routines/gr_scroll.s"
|
||||
.include "gr_fast_clear.s"
|
||||
.include "gr_hlin_double.s"
|
||||
.include "text_print.s"
|
||||
.include "gr_fade.s"
|
||||
.include "gr_plot.s"
|
||||
.include "gr_copy.s"
|
||||
.include "gr_scroll.s"
|
||||
|
||||
|
||||
.include "mode7.s"
|
||||
|
|
|
|||
351
mode7_demo/multiply_fast.s
Normal file
351
mode7_demo/multiply_fast.s
Normal file
|
|
@ -0,0 +1,351 @@
|
|||
; Fast mutiply
|
||||
|
||||
|
||||
; Note for our purposes we only care about 8.8 x 8.8 fixed point
|
||||
; with 8.8 result, which means we only care about the middle two bytes
|
||||
; of the 32 bit result. So we disable generation of the high and low byte
|
||||
; to save some cycles.
|
||||
|
||||
;
|
||||
; The old routine took around 700 cycles for a 16bitx16bit=32bit mutiply
|
||||
; This routine, at an expense of 2kB of looku tables, takes around 250
|
||||
; If you reuse a term the next time this drops closer to 200
|
||||
|
||||
; This routine was described by Stephen Judd and found
|
||||
; in The Fridge and in the C=Hacking magazine
|
||||
; http://codebase64.org/doku.php?id=base:seriously_fast_multiplication
|
||||
|
||||
; The key thing to note is that
|
||||
; (a+b)^2 (a-b)^2
|
||||
; a*b = ------- - --------
|
||||
; 4 4
|
||||
; So if you have tables of the squares of 0..511 you can lookup and subtract
|
||||
; instead of multiplying.
|
||||
|
||||
; Table generation: I:0..511
|
||||
; square1_lo = <((I*I)/4)
|
||||
; square1_hi = >((I*I)/4)
|
||||
; square2_lo = <(((I-255)*(I-255))/4)
|
||||
; square2_hi = >(((I-255)*(I-255))/4)
|
||||
|
||||
; Note: DOS3.3 starts at $9600
|
||||
|
||||
.ifndef square1_lo
|
||||
square1_lo EQU $8E00
|
||||
square1_hi EQU $9000
|
||||
square2_lo EQU $9200
|
||||
square2_hi EQU $9400
|
||||
.endif
|
||||
|
||||
; for(i=0;i<512;i++) {
|
||||
; square1_lo[i]=((i*i)/4)&0xff;
|
||||
; square1_hi[i]=(((i*i)/4)>>8)&0xff;
|
||||
; square2_lo[i]=( ((i-255)*(i-255))/4)&0xff;
|
||||
; square2_hi[i]=(( ((i-255)*(i-255))/4)>>8)&0xff;
|
||||
; }
|
||||
|
||||
init_multiply_tables:
|
||||
|
||||
; Build the add tables
|
||||
|
||||
ldx #$00
|
||||
txa
|
||||
.byte $c9 ; CMP #immediate - skip TYA and clear carry flag
|
||||
lb1: tya
|
||||
adc #$00 ; 0
|
||||
ml1: sta square1_hi,x ; square1_hi[0]=0
|
||||
tay ; y=0
|
||||
cmp #$40 ; subtract 64 and update flags (c=0)
|
||||
txa ; a=0
|
||||
ror ; rotate
|
||||
ml9: adc #$00 ; add 0
|
||||
sta ml9+1 ; update add value
|
||||
inx ; x=1
|
||||
ml0: sta square1_lo,x ; square1_lo[0]=1
|
||||
bne lb1 ; if not zero, loop
|
||||
inc ml0+2 ; increment values
|
||||
inc ml1+2 ; increment values
|
||||
clc ; c=0
|
||||
iny ; y=1
|
||||
bne lb1 ; loop
|
||||
|
||||
; Build the subtract tables based on the existing one
|
||||
|
||||
ldx #$00
|
||||
ldy #$ff
|
||||
second_table:
|
||||
lda square1_hi+1,x
|
||||
sta square2_hi+$100,x
|
||||
lda square1_hi,x
|
||||
sta square2_hi,y
|
||||
lda square1_lo+1,x
|
||||
sta square2_lo+$100,x
|
||||
lda square1_lo,x
|
||||
sta square2_lo,y
|
||||
dey
|
||||
inx
|
||||
bne second_table
|
||||
|
||||
|
||||
rts
|
||||
|
||||
|
||||
; Fast 16x16 bit unsigned multiplication, 32-bit result
|
||||
; Input: NUM1H:NUM1L * NUM2H:NUM2L
|
||||
; Result: RESULT3:RESULT2:RESULT1:RESULT0
|
||||
;
|
||||
; Does self-modifying code to hard-code NUM1H:NUM1L into the code
|
||||
; carry=0: re-use previous NUM1H:NUM1L
|
||||
; carry=1: reload NUM1H:NUM1L (58 cycles slower)
|
||||
;
|
||||
; clobbered: RESULT, X, A, C
|
||||
; Allocation setup: T1,T2 and RESULT preferably on Zero-page.
|
||||
;
|
||||
; NUM1H (x_i), NUM1L (x_f)
|
||||
; NUM2H (y_i), NUM2L (y_f)
|
||||
|
||||
; NUM1L * NUM2L = AAaa
|
||||
; NUM1L * NUM2H = BBbb
|
||||
; NUM1H * NUM2L = CCcc
|
||||
; NUM1H * NUM2H = DDdd
|
||||
;
|
||||
; AAaa
|
||||
; BBbb
|
||||
; CCcc
|
||||
; + DDdd
|
||||
; ----------
|
||||
; RESULT
|
||||
|
||||
;fixed_16x16_mul_unsigned:
|
||||
|
||||
multiply:
|
||||
|
||||
bcc num1_same_as_last_time ; 2nt/3
|
||||
|
||||
;============================
|
||||
; Set up self-modifying code
|
||||
; this changes the code to be hard-coded to multiply by NUM1H:NUM1L
|
||||
;============================
|
||||
|
||||
lda NUM1L ; load the low byte ; 3
|
||||
sta sm1a+1 ; 3
|
||||
sta sm3a+1 ; 3
|
||||
sta sm5a+1 ; 3
|
||||
sta sm7a+1 ; 3
|
||||
eor #$ff ; invert the bits for subtracting ; 2
|
||||
sta sm2a+1 ; 3
|
||||
sta sm4a+1 ; 3
|
||||
sta sm6a+1 ; 3
|
||||
sta sm8a+1 ; 3
|
||||
lda NUM1H ; load the high byte ; 3
|
||||
sta sm1b+1 ; 3
|
||||
sta sm3b+1 ; 3
|
||||
sta sm5b+1 ; 3
|
||||
; sta sm7b+1 ;
|
||||
eor #$ff ; invert the bits for subtractin ; 2
|
||||
sta sm2b+1 ; 3
|
||||
sta sm4b+1 ; 3
|
||||
sta sm6b+1 ; 3
|
||||
; sta sm8b+1 ;
|
||||
;===========
|
||||
; 52
|
||||
|
||||
num1_same_as_last_time:
|
||||
|
||||
;==========================
|
||||
; Perform NUM1L * NUM2L = AAaa
|
||||
;==========================
|
||||
|
||||
ldx NUM2L ; (low le) ; 3
|
||||
sec ; 2
|
||||
sm1a:
|
||||
lda square1_lo,x ; 4
|
||||
sm2a:
|
||||
sbc square2_lo,x ; 4
|
||||
|
||||
; a is _aa
|
||||
|
||||
; sta RESULT+0 ;
|
||||
|
||||
sm3a:
|
||||
lda square1_hi,x ; 4
|
||||
sm4a:
|
||||
sbc square2_hi,x ; 4
|
||||
; a is _AA
|
||||
sta _AA+1 ; 3
|
||||
;===========
|
||||
; 24
|
||||
|
||||
; Perform NUM1H * NUM2L = CCcc
|
||||
sec ; 2
|
||||
sm1b:
|
||||
lda square1_lo,x ; 4
|
||||
sm2b:
|
||||
sbc square2_lo,x ; 4
|
||||
; a is _cc
|
||||
sta _cc+1 ; 3
|
||||
sm3b:
|
||||
lda square1_hi,x ; 4
|
||||
sm4b:
|
||||
sbc square2_hi,x ; 4
|
||||
; a is _CC
|
||||
sta _CC+1 ; 3
|
||||
;===========
|
||||
; 24
|
||||
|
||||
;==========================
|
||||
; Perform NUM1L * NUM2H = BBbb
|
||||
;==========================
|
||||
ldx NUM2H ; 3
|
||||
sec ; 2
|
||||
sm5a:
|
||||
lda square1_lo,x ; 4
|
||||
sm6a:
|
||||
sbc square2_lo,x ; 4
|
||||
; a is _bb
|
||||
sta _bb+1 ; 3
|
||||
|
||||
sm7a:
|
||||
lda square1_hi,x ; 4
|
||||
sm8a:
|
||||
sbc square2_hi,x ; 4
|
||||
; a is _BB
|
||||
sta _BB+1 ; 3
|
||||
;===========
|
||||
; 27
|
||||
|
||||
;==========================
|
||||
; Perform NUM1H * NUM2H = DDdd
|
||||
;==========================
|
||||
sec ; 2
|
||||
sm5b:
|
||||
lda square1_lo,x ; 4
|
||||
sm6b:
|
||||
sbc square2_lo,x ; 4
|
||||
; a is _dd
|
||||
sta _dd+1 ; 3
|
||||
;sm7b:
|
||||
; lda square1_hi,x ;
|
||||
;sm8b:
|
||||
; sbc square2_hi,x ;
|
||||
; a = _DD
|
||||
; sta RESULT+3 ;
|
||||
;===========
|
||||
; 13
|
||||
|
||||
;===========================================
|
||||
; Add the separate multiplications together
|
||||
;===========================================
|
||||
|
||||
clc ; 2
|
||||
_AA:
|
||||
lda #0 ; loading _AA ; 2
|
||||
_bb:
|
||||
adc #0 ; adding in _bb ; 2
|
||||
sta RESULT+1 ; 3
|
||||
;==========
|
||||
; 9
|
||||
; product[2]=_BB+_CC+c
|
||||
|
||||
_BB:
|
||||
lda #0 ; loading _BB ; 2
|
||||
_CC:
|
||||
adc #0 ; adding in _CC ; 2
|
||||
sta RESULT+2 ; 3
|
||||
;===========
|
||||
; 7
|
||||
|
||||
; product[3]=_DD+c
|
||||
|
||||
; bcc dd_no_carry1 ;
|
||||
; inc RESULT+3 ;
|
||||
clc ; 2
|
||||
;=============
|
||||
; 2
|
||||
dd_no_carry1:
|
||||
|
||||
; product[1]=_AA+_bb+_cc
|
||||
|
||||
_cc:
|
||||
lda #0 ; load _cc ; 2
|
||||
adc RESULT+1 ; 3
|
||||
sta RESULT+1 ; 3
|
||||
|
||||
; product[2]=_BB+_CC+_dd+c
|
||||
|
||||
_dd:
|
||||
lda #0 ; load _dd ; 2
|
||||
adc RESULT+2 ; 3
|
||||
sta RESULT+2 ; 3
|
||||
|
||||
;===========
|
||||
; 16
|
||||
; product[3]=_DD+c
|
||||
|
||||
|
||||
; bcc dd_no_carry2 ;
|
||||
; inc RESULT+3 ;
|
||||
|
||||
;=============
|
||||
; 0
|
||||
|
||||
dd_no_carry2:
|
||||
|
||||
; *z_i=product[1];
|
||||
; *z_f=product[0];
|
||||
|
||||
; rts ; 6
|
||||
|
||||
|
||||
;=================
|
||||
; Signed multiply
|
||||
;=================
|
||||
|
||||
;multiply:
|
||||
|
||||
; jsr fixed_16x16_mul_unsigned ; 6
|
||||
|
||||
lda NUM1H ; x_i ; 3
|
||||
;===========
|
||||
; 12
|
||||
|
||||
|
||||
bpl x_positive ;^3/2nt
|
||||
|
||||
sec ; 2
|
||||
lda RESULT+2 ; 3
|
||||
sbc NUM2L ; 3
|
||||
sta RESULT+2 ; 3
|
||||
; lda RESULT+3 ;
|
||||
; sbc NUM2H ;
|
||||
; sta RESULT+3 ;
|
||||
;============
|
||||
; 10
|
||||
|
||||
x_positive:
|
||||
|
||||
lda NUM2H ; y_i ; 3
|
||||
;============
|
||||
; ; 6
|
||||
|
||||
bpl y_positive ;^3/2nt
|
||||
|
||||
|
||||
sec ; 2
|
||||
lda RESULT+2 ; 3
|
||||
sbc NUM1L ; 3
|
||||
sta RESULT+2 ; 3
|
||||
; lda RESULT+3 ;
|
||||
; sbc NUM1H ;
|
||||
; sta RESULT+3 ;
|
||||
;===========
|
||||
; 10
|
||||
|
||||
y_positive:
|
||||
ldx RESULT+2 ; *z_i=product[2]; ; 3
|
||||
lda RESULT+1 ; *z_f=product[1]; ; 3
|
||||
|
||||
rts ; 6
|
||||
;==========
|
||||
; 12
|
||||
|
||||
24
mode7_demo/pageflip.s
Normal file
24
mode7_demo/pageflip.s
Normal file
|
|
@ -0,0 +1,24 @@
|
|||
;==========
|
||||
; page_flip
|
||||
;==========
|
||||
|
||||
page_flip:
|
||||
lda DISP_PAGE ; 3
|
||||
beq page_flip_show_1 ; 2nt/3
|
||||
page_flip_show_0:
|
||||
bit PAGE0 ; 4
|
||||
lda #4 ; 2
|
||||
sta DRAW_PAGE ; DRAW_PAGE=1 ; 3
|
||||
lda #0 ; 2
|
||||
sta DISP_PAGE ; DISP_PAGE=0 ; 3
|
||||
rts ; 6
|
||||
page_flip_show_1:
|
||||
bit PAGE1 ; 4
|
||||
sta DRAW_PAGE ; DRAW_PAGE=0 ; 3
|
||||
lda #1 ; 2
|
||||
sta DISP_PAGE ; DISP_PAGE=1 ; 3
|
||||
rts ; 6
|
||||
;====================
|
||||
; DISP_PAGE=0 26
|
||||
; DISP_PAGE=1 24
|
||||
|
||||
80
mode7_demo/text_print.s
Normal file
80
mode7_demo/text_print.s
Normal file
|
|
@ -0,0 +1,80 @@
|
|||
;================================
|
||||
; htab_vtab
|
||||
;================================
|
||||
; move to CH/CV
|
||||
htab_vtab:
|
||||
lda CV
|
||||
asl
|
||||
tay
|
||||
lda gr_offsets,Y ; lookup low-res memory address
|
||||
clc
|
||||
adc CH ; add in xpos
|
||||
sta BASL ; store out low byte of addy
|
||||
|
||||
lda gr_offsets+1,Y ; look up high byte
|
||||
adc DRAW_PAGE ;
|
||||
sta BASH ; and store it out
|
||||
; BASH:BASL now points at right place
|
||||
|
||||
rts
|
||||
|
||||
;================================
|
||||
; move_and_print
|
||||
;================================
|
||||
; move to CH/CV
|
||||
move_and_print:
|
||||
jsr htab_vtab
|
||||
|
||||
;================================
|
||||
; print_string
|
||||
;================================
|
||||
|
||||
print_string:
|
||||
ldy #0
|
||||
print_string_loop:
|
||||
lda (OUTL),Y
|
||||
beq done_print_string
|
||||
ora #$80
|
||||
sta (BASL),Y
|
||||
iny
|
||||
bne print_string_loop
|
||||
done_print_string:
|
||||
rts
|
||||
|
||||
;====================
|
||||
; point_to_end_string
|
||||
;====================
|
||||
point_to_end_string:
|
||||
iny
|
||||
tya
|
||||
clc
|
||||
adc OUTL
|
||||
sta OUTL
|
||||
lda #0
|
||||
adc OUTH
|
||||
sta OUTH
|
||||
|
||||
rts
|
||||
|
||||
|
||||
;================================
|
||||
; print_both_pages
|
||||
;================================
|
||||
print_both_pages:
|
||||
lda DRAW_PAGE
|
||||
pha
|
||||
|
||||
lda #0
|
||||
sta DRAW_PAGE
|
||||
jsr move_and_print
|
||||
|
||||
lda #4
|
||||
sta DRAW_PAGE
|
||||
jsr move_and_print
|
||||
|
||||
pla
|
||||
sta DRAW_PAGE
|
||||
|
||||
rts ; oops forgot this initially
|
||||
; explains the weird vertical stripes on the screen
|
||||
|
||||
Loading…
Reference in New Issue
Block a user