mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-20 01:29:36 +00:00
70 lines
985 B
ArmAsm
70 lines
985 B
ArmAsm
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;=================================
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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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and #$1 ; only shift if in odd column?
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beq vlin_no_shift_colors
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jsr shift_colors
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vlin_no_shift_colors:
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lda mod7_table,X
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tax
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lda vlin_masks,X
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sta vlin_mask_smc+1
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tya
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tax ; get line count into X
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hgr_vlin_loop:
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current_row_smc:
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ldy #$dd ; get row info for Y1 into GBASL/GBASH
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lda hposn_high,Y
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sta GBASH
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lda hposn_low,Y
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sta GBASL
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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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dex
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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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