96 lines
1.2 KiB
ArmAsm
96 lines
1.2 KiB
ArmAsm
; VGI Lines
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;========================
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; VGI point
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;========================
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vgi_point:
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jsr vgi_point_common
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jmp vgi_loop
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;========================
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; VGI point common
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;========================
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VGI_PCOLOR = P0 ; if high bit set, then PX=PX+256
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VGI_PX = P1
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VGI_PY = P2
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vgi_point_common:
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ldy #0
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lda VGI_PCOLOR
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bpl vgi_point_color
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iny
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vgi_point_color:
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and #$7f
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tax
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lda COLORTBL,X
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sta HGR_COLOR
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ldx VGI_PX
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lda VGI_PY
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jsr HPLOT0 ; plot at (Y,X), (A)
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rts
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;========================
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; VGI line to
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;========================
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VGI_LX = P0
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VGI_LY = P1
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vgi_lineto:
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ldx #0
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ldy VGI_LY
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lda VGI_LX
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jsr HGLIN ; line to (X,A),(Y)
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jmp vgi_loop
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;========================
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; VGI LINE
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;========================
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; VGI_LX = P0
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; VGI_LY = P1
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VGI_LX2 = P3
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VGI_LY2 = P4
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vgi_line:
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jsr vgi_point_common
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ldx #0
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ldy VGI_LY2
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lda VGI_LX2
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jsr HGLIN ; line to (X,A),(Y)
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jmp vgi_loop
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;========================
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; VGI LINE FAR
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;========================
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; assume second x-coord is > 256
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; VGI_LX = P0
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; VGI_LY = P1
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; VGI_LX2 = P3
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; VGI_LY2 = P4
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vgi_line_far:
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jsr vgi_point_common
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ldx #1
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ldy VGI_LY2
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lda VGI_LX2
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jsr HGLIN ; line to (X,A),(Y)
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jmp vgi_loop
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