Print Page - Which is the right translation?

Title: Which is the right translation?
Post by: Farabi on November 20, 2008, 07:24:02 AM

I want to translate this C++ Structure


typedef dReal dVector4[4];
typedef dReal dMatrix3[4*3];

struct dMass {
  dReal mass;
  dVector4 c;
  dMatrix3 I;

Which is the right one?
This one?

Code Select


dMass struct
	mass dword 0
	_c real4 4 dup(0.0)
	_i real4 12 dup (0.0)
dMass ends

Or this one?

Code Select


dMatrix3 struct
	d1 real4 0.0
	d2 real4 0.0
	d3 real4 0.0
	d4 real4 0.0
	d5 real4 0.0
	d6 real4 0.0
	d7 real4 0.0
	d8 real4 0.0
	d9 real4 0.0
	d10 real4 0.0
	d11 real4 0.0
	d12 real4 0.0
	
dMatrix3 ends

dVector4 struct
	d1 real4 0.0
	d2 real4 0.0
	d3 real4 0.0
	d4 real4 0.0
dVector4 ends

dMass struct
	mass dword 0
	_c real 4dVector4 <?>
	_i real4 dMatrix3 <?>
dMass ends

Title: Re: Which is the right translation?
Post by: Tedd on November 20, 2008, 01:03:19 PM

None :P

QuotedReal mass;

You made it a dword.
And I would check how big a 'dReal' should be - is it only real4?

As for the rest, I think the first looks okay.
Although, you might need the definitions of dVector4 and dMatrix3 elsewhere, so it's worth defining them separately and using their definitions (but you can still define them with dup.)

Something like...

Code Select

dReal typedef real4     ;only a real4?

dVector4 struct
    ptA dReal ?
    ptB dReal ?
    ptC dReal ?
    ptD dReal ?
dVector4 ends

dMatrix3 struct
    v1 dVector4 <?>
    v2 dVector4 <?>
    v3 dVector4 <?>
dMatrix3 ends

dMass struct
    mass dReal ?
    _c dVector4 <>
    _I dMatrix3 <>
dMass ends

Title: Re: Which is the right translation?
Post by: Farabi on November 21, 2008, 04:15:52 AM

Hi tedd,
Sorry to take your time.

I found this on the C++ include file

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#if defined(dSINGLE)
typedef float dReal;
#ifdef dDOUBLE
#error You can only #define dSINGLE or dDOUBLE, not both.
#endif // dDOUBLE
#elif defined(dDOUBLE)
typedef double dReal;
#else
#error You must #define dSINGLE or dDOUBLE
#endif

What does it mean?

Also I googling and got this definition of dReal http://www.shogun-toolbox.org/doc/common_8h.html

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typedef double 	DREAL
 	Type DREAL is 8 bytes in size.

Dont know which is right. I upload my source and the dll just incase you want to see what Im doing.
Put this on your creation message

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.elseif uMsg==WM_CREATE
	invoke InitODE
	invoke TestODE

[attachment deleted by admin]

Title: Re: Which is the right translation?
Post by: Farabi on November 21, 2008, 07:46:02 AM

Problem solved.
Structure is accepted and the function is working.
dReal is an alias of real4 and float.

Title: Re: Which is the right translation?
Post by: tenkey on November 22, 2008, 05:49:45 AM

Only if you #define dSINGLE.

If you #define dDOUBLE, dReal becomes the alias of REAL8 and double.

Title: Re: Which is the right translation?
Post by: Farabi on November 22, 2008, 09:27:33 AM

Quote from: tenkey on November 22, 2008, 05:49:45 AM
Only if you #define dSINGLE.

If you #define dDOUBLE, dReal becomes the alias of REAL8 and double.

Fortunately the dll is only accept real4.

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General Forums => The Campus => Topic started by: Farabi on November 20, 2008, 07:24:02 AM