wine users - Apr 2001 - DirectX and Wine

I'm having problems compiling and linking a simple DirectX program with
Wine.
The problem is: a global variable c_dfDIMouse should be declared in dinput.h
and defined in library dinput.
c_dfDIMouse really is declared in dinput.h, but it seems that c_dfDIMouse is
not declared in library dinput.
During linking I get the error: undefined reference to `c_dfDIMouse'.
Anyone got a clue?

Thanks in advance,
Rein Kadijk
The Netherlands

On Thu, 26 Apr 2001, R Kadijk wrote:
> I'm having problems compiling and linking a simple DirectX program with
Wine.
> The problem is: a global variable c_dfDIMouse should be declared in
dinput.h
> and defined in library dinput.
> c_dfDIMouse really is declared in dinput.h, but it seems that c_dfDIMouse
is
> not declared in library dinput.
> During linking I get the error: undefined reference to `c_dfDIMouse'.
> Anyone got a clue?
This variable cannot (and in Windows isn't either) be exported from the
shared library (aka DLL), so it's not defined there. Rather, it's
supposed
to be in a static library (in Windows it's something like dinput.lib, I
think). I suppose it could be put into Wine's libuuid.a or something,
whenever anyone feels like adding it there (i.e. when they need it, which
I don't right now, since I don't compile DirectX apps with Winelib yet).

R Kadijk wrote:
> 
> I'm having problems compiling and linking a simple DirectX program with
Wine.
> The problem is: a global variable c_dfDIMouse should be declared in
dinput.h
> and defined in library dinput.
> c_dfDIMouse really is declared in dinput.h, but it seems that c_dfDIMouse
is
> not declared in library dinput.
> During linking I get the error: undefined reference to `c_dfDIMouse'.
> Anyone got a clue?
   Well, there seems to be a couple of problems:

 * First the variable is not defined in the dinput library. So you will
probably need to add something like this in one of the dinput files:

const DIDATAFORMAT c_dfDIMouse;

   But then it will need to be initialized somehow. How is one supposed
to get/set its value in DirectX (I don't know DirectX)? Where does its
value come from?

 * then this variable should be declared in 'dlls/dinput/dinput.spec' so
that Windows applications can use it. A line like the following should
do it:

@ extern c_dfDIMouse c_dfDIMouse

 * but the above will not help you for your Winelib application. Winelib
apps cannot import variables from a 'dll'. So what you must do is either
modify your code to invoke a standard DirectX API that would return the
information you need. Or define a couple of macros so that using
c_dfDIMouse invokes a function returning the address of that variable
and then dereferences it. The whole thing would then look like that:

include/dinput.h:
extern const DIDATAFORMAT* c_dfDIMouse();
#define c_dfDIMouse        (*__dinput_c_dfDIMouse())

dlls/dinput/xxx.c
DIDATAFORMAT dinput_c_dfDIMouse; /* Plus some code to initialize it */
const DIDATAFORMAT* __dinput_c_dfDIMouse()
{
    return &dinput_c_dfDIMouse;
}

dlls/dinput/dinput.spec:
@ extern c_dfDIMouse dinput_c_dfDIMouse


-- 
Fran?ois Gouget
fgouget@codeweavers.com