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73 lines
1.2 KiB
ArmAsm
73 lines
1.2 KiB
ArmAsm
; VGI library
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VGI_MAXLEN = 7
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;==================================
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; play_vgi
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;==================================
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play_vgi:
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vgi_loop:
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ldy #0
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data_smc:
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lda (VGIL),Y
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sta VGI_BUFFER,Y
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iny
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cpy #VGI_MAXLEN
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bne data_smc
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lda VGI_TYPE
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and #$f
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clc
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adc VGIL
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sta VGIL
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bcc no_oflo
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inc VGIH
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no_oflo:
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lda VGI_TYPE
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lsr
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lsr
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lsr
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lsr
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; look up action in jump table
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asl
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tax
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lda vgi_rts_table+1,X
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pha
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lda vgi_rts_table,X
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pha
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rts ; "jump" to subroutine
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vgi_rts_table:
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.word vgi_clearscreen-1 ; 0 = clearscreen
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.word vgi_simple_rectangle-1 ; 1 = simple rectangle
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.word vgi_circle-1 ; 2 = plain circle
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.word vgi_filled_circle-1 ; 3 = filled circle
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.word vgi_point-1 ; 4 = dot
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.word vgi_lineto-1 ; 5 = line to
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.word vgi_dithered_rectangle-1 ; 6 = dithered rectangle
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.word vgi_vertical_triangle-1 ; 7 = vertical triangle
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.word vgi_horizontal_triangle-1 ; 8 = horizontal triangle
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.word vgi_vstripe_rectangle-1 ; 9 = vstripe rectangle
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.word vgi_line-1 ;10 = line
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.word vgi_line_far-1 ;11 = line far
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.word all_done-1
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.word all_done-1
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.word all_done-1
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.word all_done-1 ; 15 = done
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all_done:
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rts
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.include "vgi_clearscreen.s"
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.include "vgi_circles.s"
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.include "vgi_rectangle.s"
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.include "vgi_lines.s"
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.include "vgi_triangles.s"
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