mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-17 14:12:58 +00:00
43 lines
593 B
ArmAsm
43 lines
593 B
ArmAsm
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; color -> trapezoid_color_smc+1
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; width -> trapezoid_width_smc+1
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; starty = Y
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; endy -> trapezoid_endy_smc+1
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; startx-> trapezoid_startx_smc+1
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; LEFTSLOPE, RIGHTSLOPE
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draw_trapezoid:
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draw_trapezoid_loop:
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clc
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trapezoid_startx_smc:
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lda #5
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adc gr_offsets,Y
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sta trapezoid_draw_loop_smc+1
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lda gr_offsets+1,Y
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clc
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adc DRAW_PAGE
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sta trapezoid_draw_loop_smc+2
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trapezoid_color_smc:
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lda #$11
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trapezoid_width_smc:
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ldx #0
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trapezoid_draw_loop:
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trapezoid_draw_loop_smc:
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sta $c00,X
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dex
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bne trapezoid_draw_loop
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dey
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dey
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trapezoid_endy_smc:
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cpy #0
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bne draw_trapezoid_loop
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rts
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