mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-27 07:29:29 +00:00
431 lines
4.9 KiB
ArmAsm
431 lines
4.9 KiB
ArmAsm
; hgr fast hlin
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HGR_BITS = $1C
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GBASL = $26
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GBASH = $27
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HGR_COLOR = $E4
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HGR_PAGE = $E6
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div7_table = $9000
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mod7_table = $9100
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KEYPRESS = $C000
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KEYRESET = $C010
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HGR2 = $F3D8 ; clear PAGE2 to 0
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HGR = $F3E2 ; set hires page1 and clear $2000-$3fff
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HPOSN = $F411 ; (Y,X),(A) (values stores in HGRX,XH,Y)
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COLOR_SHIFT = $F47E
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COLORTBL = $F6F6
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main:
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; set graphics
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jsr HGR
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; init tables
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jsr vgi_init
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; draw lines
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ldy #0
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loop1:
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tya
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lsr
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and #$7
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tax
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jsr set_hcolor
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tya
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pha
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ldx #10
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; lda #10
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; ldy #100
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jsr hgr_hlin
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pla
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tay
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iny
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iny
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cpy #190
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bne loop1
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jsr wait_until_keypress
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; test 2
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jsr HGR2
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; draw lines
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ldy #0
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loop2:
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ldx #7 ; draw white
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jsr set_hcolor
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tya ; save y on stack
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pha
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tya ; line
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lsr
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sec
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eor #$ff
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adc #96
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tax
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tya
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jsr hgr_hlin
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pla
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tay
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iny
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iny
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cpy #192
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bne loop2
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jsr wait_until_keypress
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; test 3
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jsr HGR2
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; draw lines
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ldy #0
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loop3:
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ldx #7 ; draw white
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jsr set_hcolor
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tya
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pha
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ldx #0
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jsr hgr_hlin
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pla
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tay
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iny
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cpy #192
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bne loop3
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jsr wait_until_keypress
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; test 4
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jsr HGR2
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; draw lines
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ldy #0
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loop4:
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ldx #3 ; draw white1
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jsr set_hcolor
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tya
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pha
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eor #$ff
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sec
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adc #192
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tax
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tya
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jsr hgr_hlin
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pla
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tay
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iny
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cpy #192
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bne loop4
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jsr wait_until_keypress
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done:
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jmp main
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wait_until_keypress:
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bit KEYRESET
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keypress_loop:
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lda KEYPRESS
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bpl keypress_loop
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rts
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;=================================
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; Simple Horizontal LINE
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;=================================
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; line from (x,a) to (x+y,a)
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; todo: use Carry to say if X>255
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hgr_hlin:
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; get ROW into (GBASL)
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sty xrun_save
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stx x1_save
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;ldx VGI_RX1 ; X1 into X
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; lda VGI_RY1 ; Y1 into A
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ldy #0 ; always 0
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jsr HPOSN ; (Y,X),(A) (values stores in HGRX,XH,Y)
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; important part is row is in GBASL/GBASH
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; also shifts color for us
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; Y is already the RX1/7
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; inc xrun_save ; needed because we compare with beq/bne
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; check if narrow corner case where begin and end same block
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; if RX%7 + XRUN < 8
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ldx x1_save
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lda mod7_table,X
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clc
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adc xrun_save
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cmp #7
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bcs not_same_block
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same_block:
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; want to use MASK of left_mask (MOD7) ORed with
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; right_mask (7-(mod7+xrun7)
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; 4+3
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; 0000 CCCC 0000 1111
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; 0000 000C 0000 0001
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; 4000 = 80 80
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; 4400 = 81 81
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; 4800 = 83 83
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; 4C00 = 87 87
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; 5000 = 8F 8F
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; 5400 = 9F 9F
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; 5800 = BF BF
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;----
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; 5C00 = FF FF
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; 4080 = ff 83 FF 81
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; 4480 = ff 87
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; 4880 = ff 8F
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lda mod7_table,X ; get x1%7
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tax ; put in X
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lda left_masks,X
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sta $10
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txa ; x1%7
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clc
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adc xrun_save ; (x1%7)+xrun
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tax
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lda left_masks,X
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eor #$7f
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and $10
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sta $10
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lda (GBASL),Y
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eor HGR_BITS
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and $10
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eor (GBASL),Y
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; lda (GBASL),Y ; get current pattern
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; eor HGR_BITS
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; and left_masks,X
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; ldx xrun_save
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; and right_masks,X
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; eor (GBASL),Y
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sta (GBASL),Y
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rts
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not_same_block:
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; see if not starting on boundary
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; ldx x1_save
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lda mod7_table,X
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beq draw_run
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; handle not full left border
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handle_ragged_left:
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tax
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lda (GBASL),Y
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eor HGR_BITS
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and left_masks,X
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eor (GBASL),Y
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sta (GBASL),Y
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iny ; move to next
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; adjust RUN length by 7- mod7
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txa ; load mod7
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eor #$ff
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sec
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adc #7
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eor #$ff
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sec
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adc xrun_save
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sta xrun_save
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; lda HGR_BITS ; cycle colors for next
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; jsr COLOR_SHIFT
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jsr shift_colors
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; draw common
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draw_run:
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lda xrun_save
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cmp #7
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bcc draw_right ; blt
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lda HGR_BITS ; get color
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sta (GBASL),Y ; store out
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; jsr COLOR_SHIFT ; shift colors
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iny ; move to next block
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jsr shift_colors
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lda xrun_save ; take 7 off the run
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sec
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sbc #7
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sta xrun_save
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jmp draw_run
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; draw rightmost
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draw_right:
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beq done_row
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; lda HGR_BITS
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; jsr COLOR_SHIFT
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; see if not starting on boundary
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ldx xrun_save
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tax
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lda (GBASL),Y
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eor HGR_BITS
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and right_masks,X
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eor (GBASL),Y
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sta (GBASL),Y
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done_row:
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done_done:
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rts
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x1_save: .byte $00
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xrun_save: .byte $00
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;=====================
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; make /7 %7 tables
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;=====================
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vgi_init:
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vgi_make_tables:
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ldy #0
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lda #0
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ldx #0
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div7_loop:
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sta div7_table,Y
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inx
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cpx #7
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bne div7_not7
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clc
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adc #1
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ldx #0
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div7_not7:
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iny
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bne div7_loop
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ldy #0
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lda #0
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mod7_loop:
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sta mod7_table,Y
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clc
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adc #1
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cmp #7
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bne mod7_not7
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lda #0
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mod7_not7:
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iny
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bne mod7_loop
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rts
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left_masks:
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.byte $FF,$FE,$FC,$F8, $F0,$E0,$C0
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; CCCCCCC
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; 0CCCCCC
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; 00CCCCC
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; 000CCCC
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; 0000CCC
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; 00000CC
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; 000000C
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right_masks:
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; .byte $81,$83,$87, $8F,$9F,$BF,$FF
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.byte $80,$81,$83,$87, $8F,$9F,$BF,$FF
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; C000000
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; CC00000
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; CCC0000
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; CCCC000
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; CCCCC00
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; CCCCCC0
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; CCCCCCC
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;==========================
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; shift colors
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;==========================
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; 00000000 and 10000000 => no change (black)
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; 01111111 and 11111111 => no change? (white)
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; 01010101 => invert 00101010
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shift_colors:
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lda HGR_BITS
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asl
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cmp #$C0
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bpl done_shift_colors
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lda HGR_BITS
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eor #$7f
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sta HGR_BITS
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done_shift_colors:
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rts
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;==========================
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; set color
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;==========================
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; color in X
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set_hcolor:
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lda COLORTBL,X
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sta HGR_COLOR
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rts
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