mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-20 03:35:24 +00:00
452 lines
6.6 KiB
ArmAsm
452 lines
6.6 KiB
ArmAsm
.include "zp.inc"
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scroll_row1 EQU $8A00
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scroll_row2 EQU $8B00
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scroll_row3 EQU $8C00
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scroll_row4 EQU $8D00
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SCROLL_LENGTH EQU $E6
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;================================
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; Clear screen and setup graphics
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;================================
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jsr clear_screens ; clear top/bottom of page 0/1
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jsr set_gr_page0
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;===============
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; Init Variables
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;===============
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lda #0
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sta DISP_PAGE
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sta ANGLE
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;=======================
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; decompress scroll text
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;=======================
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lda #>deater_scroll
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sta INH
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lda #<deater_scroll
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sta INL
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jsr decompress_scroll
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scroll_loop:
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ldx #0
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ldy ANGLE
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lda DISP_PAGE
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beq draw_page2
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lda #4
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sta sm1+2
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sta sm2+2
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lda #5
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sta sm3+2
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sta sm4+2
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jmp draw_done
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draw_page2:
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lda #8
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sta sm1+2
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sta sm2+2
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lda #9
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sta sm3+2
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sta sm4+2
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draw_done:
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draw_loop:
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lda scroll_row1,Y
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sm1:
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sta $400,X
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lda scroll_row2,Y
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sm2:
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sta $480,X
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lda scroll_row3,Y
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sm3:
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sta $500,X
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lda scroll_row4,Y
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sm4:
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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 draw_loop
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;==================
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; flip pages
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;==================
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jsr page_flip ; 6
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;==================
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; delay
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;==================
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lda #125
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jsr WAIT
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;==================
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; loop forever
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;==================
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clc
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lda ANGLE
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adc #40
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cmp SCROLL_LENGTH
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bne blah
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lda #0
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sta ANGLE
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jmp scroll_loop
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blah:
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inc ANGLE
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jmp scroll_loop ; 3
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;=======================
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; decompress scroll
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;=======================
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decompress_scroll:
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ldy #0
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jsr load_and_increment
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sta SCROLL_LENGTH
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lda #<scroll_row1
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sta OUTL
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lda #>scroll_row1
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sta OUTH
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decompress_scroll_loop:
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jsr load_and_increment ; load compressed value
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cmp #$A1 ; EOF marker
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beq done_decompress_scroll ; if EOF, exit
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pha ; save
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and #$f0 ; mask
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cmp #$a0 ; see if special AX
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beq decompress_special
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pla ; note, PLA sets flags!
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ldx #$1 ; only want to print 1
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bne decompress_run
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decompress_special:
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pla
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and #$0f ; check if was A0
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bne decompress_color ; if A0 need to read run, color
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decompress_large:
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jsr load_and_increment ; get run length
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decompress_color:
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tax ; put runlen into X
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jsr load_and_increment ; get color
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decompress_run:
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sta (OUTL),Y
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pha
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clc ; increment 16-bit pointer
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lda OUTL
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adc #$1
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sta OUTL
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lda OUTH
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adc #$0
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sta OUTH
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pla
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dex ; repeat for X times
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bne decompress_run
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beq decompress_scroll_loop ; get next run
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done_decompress_scroll:
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rts
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load_and_increment:
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lda (INL),Y ; load and increment 16-bit pointer
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pha
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clc
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lda INL
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adc #$1
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sta INL
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lda INH
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adc #$0
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sta INH
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pla
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rts
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;===============================================
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; Variables
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;===============================================
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.include "deater_scroll.inc"
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;=====================================================================
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;= ROUTINES
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;=====================================================================
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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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;==========
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; page_flip
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;==========
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page_flip:
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; lda $c019 ; wait for vertical refresh
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; bmi page_flip
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lda DISP_PAGE ; 3
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beq page_flip_show_1 ; 2nt/3
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page_flip_show_0:
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bit PAGE0 ; 4
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lda #4 ; 2
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sta DRAW_PAGE ; DRAW_PAGE=1 ; 3
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lda #0 ; 2
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sta DISP_PAGE ; DISP_PAGE=0 ; 3
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rts ; 6
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page_flip_show_1:
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bit PAGE1 ; 4
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sta DRAW_PAGE ; DRAW_PAGE=0 ; 3
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lda #1 ; 2
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sta DISP_PAGE ; DISP_PAGE=1 ; 3
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rts ; 6
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;====================
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; DISP_PAGE=0 26
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; DISP_PAGE=1 24
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;==========================================================
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; set_gr_page0
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;==========================================================
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;
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set_gr_page0:
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;lda #4
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;sta GR_PAGE
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bit PAGE0 ; set page 0
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bit LORES ; Lo-res graphics
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bit TEXTGR ; mixed gr/text mode
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bit SET_GR ; set graphics
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rts
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;================================
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; hlin_setup
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;================================
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; put address in GBASL/GBASH
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; Ycoord in A, Xcoord in Y
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hlin_setup:
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sty TEMPY ; 3
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tay ; y=A ; 2
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lda gr_offsets,Y ; lookup low-res memory address ; 4
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clc ; 2
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adc TEMPY ; 3
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sta GBASL ; 3
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iny ; 2
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lda gr_offsets,Y ; 4
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adc DRAW_PAGE ; add in draw page offset ; 3
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sta GBASH ; 3
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rts ; 6
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;===========
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; 35
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;================================
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; hlin_double:
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;================================
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; HLIN Y, V2 AT A
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; Y, X, A trashed
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; start at Y, draw up to and including X
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hlin_double:
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;int hlin_double(int page, int x1, int x2, int at) {
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jsr hlin_setup ; 41
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sec ; 2
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lda V2 ; 3
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sbc TEMPY ; 3
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tax ; 2
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inx ; 2
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;===========
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; 53
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; fallthrough
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;=================================
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; hlin_double_continue: width
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;=================================
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; width in X
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hlin_double_continue:
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ldy #0 ; 2
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lda COLOR ; 3
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hlin_double_loop:
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sta (GBASL),Y ; 6
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inc GBASL ; 5
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dex ; 2
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bne hlin_double_loop ; 2nt/3
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rts ; 6
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;=============
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; 53+5+X*16+5
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;================================
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; hlin_single:
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;================================
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; HLIN Y, V2 AT A
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; Y, X, A trashed
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hlin_single:
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jsr hlin_setup
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sec
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lda V2
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sbc TEMPY
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tax
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; fallthrough
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;=================================
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; hlin_single_continue: width
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;=================================
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; width in X
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hlin_single_continue:
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hlin_single_top:
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lda COLOR
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and #$f0
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sta COLOR
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hlin_single_top_loop:
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ldy #0
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lda (GBASL),Y
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and #$0f
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ora COLOR
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sta (GBASL),Y
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inc GBASL
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dex
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bne hlin_single_top_loop
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rts
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hlin_single_bottom:
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lda COLOR
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and #$0f
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sta COLOR
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hlin_single_bottom_loop:
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ldy #0
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lda (GBASL),Y
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and #$f0
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sta (GBASL),Y
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inc GBASL
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dex
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bne hlin_single_bottom_loop
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rts
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;=============================
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; clear_top
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;=============================
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clear_top:
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lda #$00
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;=============================
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; clear_top_a
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;=============================
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clear_top_a:
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sta COLOR
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; VLIN Y, V2 AT A
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lda #40
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sta V2
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lda #0
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clear_top_loop:
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ldy #0
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pha
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jsr hlin_double
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pla
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clc
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adc #$2
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cmp #40
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bne clear_top_loop
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rts
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clear_bottom:
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lda #$a0 ; NORMAL space
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sta COLOR
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lda #40
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sta V2
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clear_bottom_loop:
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ldy #0
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pha
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jsr hlin_double
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pla
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clc
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adc #$2
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cmp #48
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bne clear_bottom_loop
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rts
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; move these to zero page for slight speed increase?
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gr_offsets:
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.word $400,$480,$500,$580,$600,$680,$700,$780
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.word $428,$4a8,$528,$5a8,$628,$6a8,$728,$7a8
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.word $450,$4d0,$550,$5d0,$650,$6d0,$750,$7d0
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