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58 lines
1.3 KiB
NASM
58 lines
1.3 KiB
NASM
// Complex C-struct - copying a sub-struct from C-standard layout to Unwound layout
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// Commodore 64 PRG executable file
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.file [name="struct-37.prg", type="prg", segments="Program"]
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.segmentdef Program [segments="Basic, Code, Data"]
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.segmentdef Basic [start=$0801]
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.segmentdef Code [start=$80d]
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.segmentdef Data [startAfter="Code"]
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.segment Basic
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:BasicUpstart(main)
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.const MOVE_TO = 0
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.const SPLINE_TO = 1
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.const OFFSET_STRUCT_SEGMENT_TO = 1
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.const OFFSET_STRUCT_SPLINEVECTOR16_Y = 1
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.label SCREEN = $400
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.segment Code
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main: {
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.label to_x = 3
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.label to_y = 4
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.label j = 2
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lda #0
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sta.z j
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tax
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__b1:
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// to = letter_c[i].to
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txa
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asl
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asl
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stx.z $ff
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clc
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adc.z $ff
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tay
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lda letter_c+OFFSET_STRUCT_SEGMENT_TO,y
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sta.z to_x
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lda letter_c+OFFSET_STRUCT_SEGMENT_TO+OFFSET_STRUCT_SPLINEVECTOR16_Y,y
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sta.z to_y
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// SCREEN[j++] = to.x
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lda.z to_x
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ldy.z j
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sta SCREEN,y
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// SCREEN[j++] = to.x;
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iny
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// SCREEN[j++] = to.y
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lda.z to_y
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sta SCREEN,y
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// SCREEN[j++] = to.y;
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iny
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sty.z j
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// for( byte i: 0..2)
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inx
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cpx #3
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bne __b1
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// }
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rts
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}
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.segment Data
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// True type letter c
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letter_c: .byte MOVE_TO, 'a', 'b', 0, 0, SPLINE_TO, 'c', 'd', $67, $a9, SPLINE_TO, 'e', 'f', $4b, $c3
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