mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-17 14:12:58 +00:00
97 lines
1.1 KiB
ArmAsm
97 lines
1.1 KiB
ArmAsm
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; VGI Triangles
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SKIP = TEMP0
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;========================
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; VGI vertical triangle
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;========================
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VGI_TCOLOR = P0
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VGI_VX = P1
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VGI_VY = P2
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VGI_TXL = P3
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VGI_TXR = P4
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VGI_TYB = P5
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vgi_vertical_triangle:
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lda VGI_TCOLOR
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lsr
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lsr
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lsr
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lsr
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sta SKIP
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lda VGI_TCOLOR
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and #$f
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tax
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lda COLORTBL,X
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sta HGR_COLOR
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vtri_loop:
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ldy #0
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ldx VGI_VX
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lda VGI_VY
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jsr HPLOT0 ; plot at (Y,X), (A)
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ldx #0
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ldy VGI_TYB
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lda VGI_TXL
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jsr HGLIN ; line to (X,A),(Y)
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lda VGI_TXL
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clc
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adc SKIP
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sta VGI_TXL
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; inc VGI_TXL
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; lda VGI_TXL
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cmp VGI_TXR
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bcc vtri_loop
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done_vtri:
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jmp vgi_loop ; bra
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;========================
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; VGI horizontal triangle
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;========================
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; VGI_TCOLOR = P0
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; VGI_VX = P1
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; VGI_VY = P2
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VGI_THYT = P3
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VGI_THYB = P4
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VGI_THXR = P5
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vgi_horizontal_triangle:
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ldx VGI_TCOLOR
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lda COLORTBL,X
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sta HGR_COLOR
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htri_loop:
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ldy #0
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ldx VGI_VX
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lda VGI_VY
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jsr HPLOT0 ; plot at (Y,X), (A)
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ldx #0
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ldy VGI_THYT
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lda VGI_THXR
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jsr HGLIN ; line to (X,A),(Y)
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inc VGI_THYT
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lda VGI_THYT
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cmp VGI_THYB
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bcc htri_loop
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done_htri:
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jmp vgi_loop
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