2018-09-02 17:31:03 +00:00
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; For increased precision, all values are stored in units of 1/16th of a pixel.
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motion_t struc
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cur Point ?
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prev Point ?
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velocity Point ?
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motion_t ends
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MOTION_UPDATE_DEF macro instance
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; Returns the new current position in AX (X) and DX (Y).
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;
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2019-09-15 16:23:33 +00:00
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; Point pascal near motion_update(motion_t near *motion);
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public _MOTION_UPDATE_&instance
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2018-09-02 17:31:03 +00:00
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_motion_update_&instance proc near
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motion = word ptr 2
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mov bx, sp
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mov bx, ss:[bx+motion]
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mov ax, word ptr [bx+motion_t.cur]
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mov word ptr [bx+motion_t.prev], ax
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add ax, word ptr [bx+motion_t.velocity]
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mov word ptr [bx+motion_t.cur], ax
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add bx, Point.y
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mov dx, word ptr [bx+motion_t.cur]
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mov word ptr [bx+motion_t.prev], dx
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add dx, word ptr [bx+motion_t.velocity]
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mov word ptr [bx+motion_t.cur], dx
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retn 2
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_motion_update_&instance endp
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endm
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