mirror of
https://github.com/deater/dos33fsprogs.git
synced 2025-01-07 12:31:57 +00:00
112 lines
1.7 KiB
ArmAsm
112 lines
1.7 KiB
ArmAsm
;=================================
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; Simple Vertical LINE
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;=================================
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; line from (x,a) to (x,a+y)
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; todo: use Carry to say if X>255
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hgr_vlin:
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; don't handle run of 0
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cpy #0
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beq done_hgr_vlin
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; get initial ROW into (GBASL)
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sta current_row_smc+1 ; save current A
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sty vlin_row_count
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lda div7_table,X
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sta x1_save_smc+1
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lda mod7_table,X
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tax
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lda vlin_masks,X
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sta vlin_mask_smc+1
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hgr_vlin_loop:
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current_row_smc:
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lda #$dd
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ldx #0 ; doesn't matter
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ldy #0 ; always 0
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jsr HPOSN ; (Y,X),(A) (values stores in HGRX,XH,Y)
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; important part is row is in GBASL/GBASH
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; HPOSN also shifts color odd/even for us
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; HPOSN also puts X1/7 into Y
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x1_save_smc:
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ldy #$dd
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lda (GBASL),Y
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eor HGR_BITS
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vlin_mask_smc:
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and #$dd
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eor (GBASL),Y
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sta (GBASL),Y
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inc current_row_smc+1
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dec vlin_row_count
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bne hgr_vlin_loop
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done_hgr_vlin:
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rts
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vlin_row_count: .byte $00
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vlin_masks:
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.byte $81,$82,$84,$88,$90,$A0,$C0
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;==========================
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; shift colors
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;==========================
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; 00000000 and 10000000 => no change (black)
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; 01111111 and 11111111 => no change? (white)
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; 01010101 => invert 00101010
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shift_colors:
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lda HGR_BITS
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asl
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cmp #$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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; notes
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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 81 FF 81
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; 4480 = ff 83
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; 4880 = ff 87
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; 4c80 = ff 8F
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; 5080 = ff 9f
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; 5480 = ff bf
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;-----------
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; 5880 = ff ff
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; 5c80 = ff ff 81
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