2019-12-27 21:35:05 +00:00
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// Minimal struct with C-Standard behavior - call parameter (not supported yet)
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.pc = $801 "Basic"
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:BasicUpstart(main)
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.pc = $80d "Program"
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.label SCREEN = $400
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2020-01-08 23:30:16 +00:00
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.const SIZEOF_STRUCT_POINT = 2
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2019-12-27 21:35:05 +00:00
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.const OFFSET_STRUCT_POINT_Y = 1
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main: {
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.label point1 = 2
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.label point2 = 4
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2020-02-23 08:44:36 +00:00
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// point1 = { 2, 3 }
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2020-01-08 23:30:16 +00:00
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ldy #SIZEOF_STRUCT_POINT
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!:
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lda __0-1,y
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sta point1-1,y
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dey
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bne !-
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2020-02-23 08:44:36 +00:00
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// point2 = { 4, 5 }
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2020-01-08 23:30:16 +00:00
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ldy #SIZEOF_STRUCT_POINT
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!:
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lda __1-1,y
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sta point2-1,y
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dey
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bne !-
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2020-02-23 08:44:36 +00:00
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// print(point1)
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2019-12-27 21:35:05 +00:00
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lda.z point1
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ldx point1+OFFSET_STRUCT_POINT_Y
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jsr print
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2020-02-23 08:44:36 +00:00
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// print(point2)
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2019-12-27 21:35:05 +00:00
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lda.z point2
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ldx point2+OFFSET_STRUCT_POINT_Y
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jsr print
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2020-02-23 08:44:36 +00:00
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// }
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2019-12-27 21:35:05 +00:00
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rts
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}
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// print(byte register(A) p_x, byte register(X) p_y)
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print: {
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2020-02-23 08:44:36 +00:00
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// SCREEN[0] = p.x
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2019-12-27 21:35:05 +00:00
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sta SCREEN
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2020-02-23 08:44:36 +00:00
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// SCREEN[1] = p.y
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2019-12-27 21:35:05 +00:00
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stx SCREEN+1
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2020-02-23 08:44:36 +00:00
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// }
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2019-12-27 21:35:05 +00:00
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rts
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}
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2020-01-08 23:30:16 +00:00
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__0: .byte 2, 3
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__1: .byte 4, 5
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