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64 lines
1.3 KiB
NASM
64 lines
1.3 KiB
NASM
// Demonstrates initializing an array of structs
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// Array of structs containing words
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// Commodore 64 PRG executable file
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.file [name="initializer-3.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 OFFSET_STRUCT_POINT_Y = 1
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.segment Code
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main: {
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.label SCREEN = $400
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.label __4 = 3
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.label idx = 2
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lda #0
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sta.z idx
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tax
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__b1:
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// SCREEN[idx++] = points[i].x
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txa
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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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sta.z __4
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tay
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lda points,y
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ldy.z idx
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sta SCREEN,y
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// SCREEN[idx++] = points[i].x;
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inc.z idx
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// BYTE0(points[i].y)
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ldy.z __4
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lda points+OFFSET_STRUCT_POINT_Y,y
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// SCREEN[idx++] = BYTE0(points[i].y)
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ldy.z idx
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sta SCREEN,y
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// SCREEN[idx++] = BYTE0(points[i].y);
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inc.z idx
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// BYTE1(points[i].y)
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ldy.z __4
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lda points+OFFSET_STRUCT_POINT_Y+1,y
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// SCREEN[idx++] = BYTE1(points[i].y)
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ldy.z idx
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sta SCREEN,y
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// SCREEN[idx++] = BYTE1(points[i].y);
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inc.z idx
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// for( char 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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points: .byte 1
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.word 2
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.byte 3
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.word 4
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.byte 5
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.word 6
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