pushing double values

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zenek_tm

Joined: 21 Mar 2004
Posts: 33
Location: Poland

zenek_tm 21 Mar 2004, 19:05

Hi all.

I'm new to assembler, so I ask for well commented answers. Smile

1. I need to call a function that requires four 8-byte floating point values. How can I push them on stack to make it work?

2. If I define

Code:

label dq 1.1

will label contain a 64bit floating point value of 1.1 or 32bit value and 32bits of zero?

Thanks for the answers.

21 Mar 2004, 19:05

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 21 Mar 2004, 19:59

1. either you can push address of 64bit variable, or push it as two 32bit values, like:

Code:

push [var64 + 4]
push [var64]

2. it contains 64bit floating point value of 1.1

21 Mar 2004, 19:59

zenek_tm

Joined: 21 Mar 2004
Posts: 33
Location: Poland

zenek_tm 21 Mar 2004, 20:29

Quote:

1. either you can push address of 64bit variable, or push it as two 32bit values, like:
Code:
    code:
    push [var64 + 4]
    push [var64]
    

I can't push addresses of those values, because it's not my function. And I tried to push them in two parts, but it's not working. Here's the invoke:

Code:

        invoke  gluPerspective, dword [f1], dword [f1+4],\
                                dword [result], dword [result+4],\
                                dword [f2], dword [f2+4],\
                                dword [f3], dword [f3+4]

f1, result, f2 and f3 are qword values. Unless I'm not invoking it properly, but I also tried to invoke it like this:

Code:

        invoke  gluPerspective, dword [f1+4], dword [f1],\
                                dword [result+4], dword [result],\
                                dword [f2+4], dword [f2],\
                                dword [f3+4], dword [f3]

with the same result (not working).

//EDIT
Sorry for this post. It appears, that calling works, but nothing is drawn. But I can't find the bug in my code. Thank's for the answer and sorry once again.

21 Mar 2004, 20:29

comrade

Joined: 16 Jun 2003
Posts: 1150
Location: Russian Federation

comrade 22 Mar 2004, 01:40

The first one seems to be correct, but I do not see where your problem could be. Here is how I use:

Code:

stdcall [glOrtho],dword [wx+00h],dword [wx+04h],dword [ww+00h],dword [ww+04h],dword [wy+00h],dword [wy+04h],dword [wh+00h],dword [wh+04h],dword [wnear+00h],dword [wnear+04h],dword [wfar+00h],dword [wfar+04h]

 wx              dq      0.0
 wy              dq      0.0
 ww              dq      640.0
       wh              dq      480.0
       wnear           dq      -1.0
        wfar            dq      1.0

_________________
comrade (comrade64@live.com; http://comrade.ownz.com/)

22 Mar 2004, 01:40

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 22 Mar 2004, 06:06

i thought OpenGL uses 32bit floating point values.

22 Mar 2004, 06:06

zenek_tm

Joined: 21 Mar 2004
Posts: 33
Location: Poland

zenek_tm 22 Mar 2004, 07:27

vid wrote:

i thought OpenGL uses 32bit floating point values.

Some GL functions are for floats, other are for double like glColor3f (floats) and glColor3d (double). And the problem was with glClearDepth function. It needs double value, and I was giving it a float. Asembly programing is trickier, than I thought.

22 Mar 2004, 07:27

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 22 Mar 2004, 20:14

but gives you strength! Very Happy

22 Mar 2004, 20:14

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