Dword push in FASM (OpenGL procedures)

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Tyler Durden

Joined: 24 Feb 2004
Posts: 50

Tyler Durden 28 Apr 2004, 11:27

Hi all
The question is how I can push a dword value to use with OpenGL procedures ? For example with glOrtho ?

28 Apr 2004, 11:27

Endre

Joined: 29 Dec 2003
Posts: 215
Location: Budapest, Hungary

Endre 28 Apr 2004, 12:20

Tyler Durden wrote:

how I can push a dword value to use with OpenGL procedures ? For example with glOrtho ?

if you think of double value then it seems something like this

Code:

fld  qword [double_source]
fstp qword [esp]
call calc
...

if you really think of dword value (int32) then you likely want to use fild instead of fld

Code:

fild dword [int32_source]
fstp qword [esp]
call calc
...

Don't forget that fstp, unlike push, doesn't change esp register, that is you may still have to change it according to the calling convention.

Endre.

28 Apr 2004, 12:20

Tyler Durden

Joined: 24 Feb 2004
Posts: 50

Tyler Durden 28 Apr 2004, 12:30

But can i use something like glPush in MASM ?

28 Apr 2004, 12:30

scientica
Retired moderator

Joined: 16 Jun 2003
Posts: 689
Location: Linköping, Sweden

scientica 28 Apr 2004, 13:35

I made a few macros my self some time ago (attachment), they makes life easier to use OpenGLs float funcions (those which use GLfloat).

As for masm, I don't recall how it's done there but iirc the stanard push could handle it.

Short description of some of the macros:

glPush <GLfloatVar>
Push a GLfloat (immediate) value, eg. glPush 1.2f

macro glCall <proc name>, [arg]
call a procedure, passing *only* immediate GLfloats.

macro glPush2 <GLfloatVar>
Push a GLfloat variable('s value) which is defined in eg, the .data section. Eg. glPush2 detlaX

macro glCall2 <proc>, [arg]
call a function, like in glCall, but pass *only* GLfloat variables

macro glCall3 <proc>,[arg]
An attempt to make one function of glCall and glCall2, tries to sense if it's an immediate valuer or an variable.

there are some more macros, you can take a look at them to see glCall2 in use - it was so long time ago since I used them I don't recall how they work, so I'll leave them uncommeneted for now.

Description:	Macros	Download
Filename:	opengl.mac.inc
Filesize:	1.11 KB
Downloaded:	960 Time(s)

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28 Apr 2004, 13:35

metalfishx

Joined: 30 Sep 2004
Posts: 65
Location: Florida, Uruguay

metalfishx 01 Nov 2004, 12:59

Hello Scientica...
I saw the thread about Windows faq, where you say about this opengl float macros. I have downloaded, and i think you can simplify the macros a little; i mena, you can have only one macro for each situation; for example, instead have glPush and glPush2 you can have for example:

Code:

macro glPush GLfloatVar {
      if GLfloatVar eqtype 0.0f
        virtual at 0
                dq GLfloatVar
                load name.l dword from 0
                load name.h dword from 4
        end virtual
        push name.h
        push name.l
      else
        ..name = GLfloatVar
        push dword [..name+4]
        push dword [..name]
      end if
}

The same with the glCall, right?
Smile

Thanks for these macros.

Last edited by metalfishx on 04 Nov 2004, 05:35; edited 1 time in total

01 Nov 2004, 12:59

scientica
Retired moderator

Joined: 16 Jun 2003
Posts: 689
Location: Linköping, Sweden

scientica 01 Nov 2004, 15:39

Sure, feel free to shorten them down Smile

01 Nov 2004, 15:39

metalfishx

Joined: 30 Sep 2004
Posts: 65
Location: Florida, Uruguay

metalfishx 04 Nov 2004, 05:33

Hello.

Ok, tellme if this work for you Wink

(fasm 1.56) Smile

Code:

macro glPush GLfloatVar {
      if GLfloatVar eqtype 0.0f
        virtual at 0
                dq GLfloatVar
                load name.l dword from 0
                load name.h dword from 4
        end virtual
        push name.h
        push name.l
      else
        ..name = GLfloatVar
        push dword [..name+4]
        push dword [..name]
      end if
}

macro glCall proc,[arg] {
        common
        if ~ arg eq
        reverse
                glPush arg
        common
        end if
       call [proc]
}

try to do this, and tellme if its ok?..

Code:

....
    TestF  dq 4.232f
    TestF2 dq 1.2f

....
    glPush TestF
    glPush TestF2
    glPush 4.232f
    glPush 1.2f

?

Cheers...! Smile

04 Nov 2004, 05:33

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