[Caml-list] How to synchtonize swap buffers with vertical retrace in lablgk/lablgtk, or labgl/labltk,

[Caml-list] How to synchtonize swap buffers with vertical retrace in lablgk/lablgtk, or labgl/labltk,

[Peter Ronnquist]

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Hello,

I am looking for a way to synchronize swapbuffers with
the vertical retrace using lablg and lablgtk or labltk
for creating the window to draw the opengl graphics
in.

Does anyone know if this is possible?

I suspect that one need to use a more "low level"
library like sdl or glut/glx to achieve this.

Best Regards
Peter Rönnquist 

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Re: [Caml-list] How to synchtonize swap buffers with vertical retrace in lablgk/lablgtk, or labgl/labltk,

[Chris Hecker]

>I am looking for a way to synchronize swapbuffers with
>the vertical retrace using lablg and lablgtk or labltk
>for creating the window to draw the opengl graphics
>in.
>Does anyone know if this is possible?

You usually have to do this through an extension.  It's a windowing system issue (or at least, that's how OpenGL thinks of it).  So, on windows there's a SwapInterval extension, and I'm not sure about X, but it's probably the same.

You'll need to write a thunk to the extension in C to use it, because lablgl does not support extensions yet.  I hope to fix this at some point soon. 

Chris


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Re: [Caml-list] How to synchtonize swap buffers with vertical retrace in lablgk/lablgtk, or labgl/labltk,

[Sven LUTHER]

On Thu, May 03, 2001 at 11:11:50AM -0700, Chris Hecker wrote:
> 
> >I am looking for a way to synchronize swapbuffers with
> >the vertical retrace using lablg and lablgtk or labltk
> >for creating the window to draw the opengl graphics
> >in.
> >Does anyone know if this is possible?
> 
> You usually have to do this through an extension.  It's a windowing system issue (or at least, that's how OpenGL thinks of it).  So, on windows there's a SwapInterval extension, and I'm not sure about X, but it's probably the same.
> 
> You'll need to write a thunk to the extension in C to use it, because lablgl does not support extensions yet.  I hope to fix this at some point soon. 

Does X not do this by himself, at least if you use hardware accelerated mesa
drivers (the dri version of them). Not sure though.

Friendly,

Sven Luther
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Re: [Caml-list] How to synchtonize swap buffers with vertical retrace in lablgk/lablgtk, or labgl/labltk,

[Peter Ronnquist]

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--- Sven LUTHER <luther@dpt-info.u-strasbg.fr> wrote:
> On Thu, May 03, 2001 at 11:11:50AM -0700, Chris
> Hecker wrote:
> > 
> > >I am looking for a way to synchronize swapbuffers
> with
> > >the vertical retrace using lablg and lablgtk or
> labltk
> > >for creating the window to draw the opengl
> graphics
> > >in.
> > >Does anyone know if this is possible?
> > 
> > You usually have to do this through an extension. 
> It's a windowing system issue (or at least, that's
> how OpenGL thinks of it).  So, on windows there's a
> SwapInterval extension, and I'm not sure about X,
> but it's probably the same.
> > 
> > You'll need to write a thunk to the extension in C
> to use it, because lablgl does not support
> extensions yet.  I hope to fix this at some point
> soon. 
> 
> Does X not do this by himself, at least if you use
> hardware accelerated mesa
> drivers (the dri version of them). Not sure though.


I have looked into the examples that are provided with
lablgl and lablgtk and comparared it with the C
version of gears.c. You can notice a small disruption
in the animation gears.ml and planet.ml (when the
planet is closer and is displayed big on the screen).
This is due to that the swap buffer is done when the
monitors ray gun is in the middle of the graphics.

There are also some small and good tutorial examples
that uses C and glx that does not have this problem.
Here there is no disruption of the animation at all.
I can provide you with the link to this webpage when I
get access to the link.

It seems that it is up to the library that you use for
handling the window for opengl. Appearantly gtk and tk
does not do this syncronization.
glut, glx do this and I am almost sure that sdl do
that as well. 

Best Regards
Peter Rönnquist




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Re: [Caml-list] How to synchtonize swap buffers with vertical retrace in lablgk/lablgtk, or labgl/labltk,

[Sven LUTHER]

On Fri, May 04, 2001 at 02:30:28AM -0700, Peter Ronnquist wrote:
> 
> --- Sven LUTHER <luther@dpt-info.u-strasbg.fr> wrote:
> > On Thu, May 03, 2001 at 11:11:50AM -0700, Chris
> > Hecker wrote:
> > > 
> > > >I am looking for a way to synchronize swapbuffers
> > with
> > > >the vertical retrace using lablg and lablgtk or
> > labltk
> > > >for creating the window to draw the opengl
> > graphics
> > > >in.
> > > >Does anyone know if this is possible?
> > > 
> > > You usually have to do this through an extension. 
> > It's a windowing system issue (or at least, that's
> > how OpenGL thinks of it).  So, on windows there's a
> > SwapInterval extension, and I'm not sure about X,
> > but it's probably the same.
> > > 
> > > You'll need to write a thunk to the extension in C
> > to use it, because lablgl does not support
> > extensions yet.  I hope to fix this at some point
> > soon. 
> > 
> > Does X not do this by himself, at least if you use
> > hardware accelerated mesa
> > drivers (the dri version of them). Not sure though.
> 
> 
> I have looked into the examples that are provided with
> lablgl and lablgtk and comparared it with the C
> version of gears.c. You can notice a small disruption
> in the animation gears.ml and planet.ml (when the
> planet is closer and is displayed big on the screen).
> This is due to that the swap buffer is done when the
> monitors ray gun is in the middle of the graphics.
> 
> There are also some small and good tutorial examples
> that uses C and glx that does not have this problem.
> Here there is no disruption of the animation at all.
> I can provide you with the link to this webpage when I
> get access to the link.
> 
> It seems that it is up to the library that you use for
> handling the window for opengl. Appearantly gtk and tk
> does not do this syncronization.
> glut, glx do this and I am almost sure that sdl do
> that as well. 

mmm, ...

lablgl + lablgtk uses the gtkglarea library, if i am not wrong. Did you try
the gtkglarea examples for the same thing ? 

Also what openGL lib are you using, what X server, what OS, what graphic card
? All of this may have an impact on the openGL display. Also are you using
software rendreing or hardware ? try glxinfo to be sure.

Do you have an idea of what the C example you speak about do that is not done
by lablgl ? 

Or maybe it is just the garbage collector quicking in, and thus slowing the
display ?

Friendly,

Sven Luther


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Re: [Caml-list] How to synchtonize swap buffers with vertical retrace in lablgk/lablgtk, or labgl/labltk,

[Peter Ronnquist]

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--- Sven LUTHER <luther@dpt-info.u-strasbg.fr> wrote:
> On Fri, May 04, 2001 at 02:30:28AM -0700, Peter
> Ronnquist wrote:
> > 
> > --- Sven LUTHER <luther@dpt-info.u-strasbg.fr>
> wrote:
> > > On Thu, May 03, 2001 at 11:11:50AM -0700, Chris
> > > Hecker wrote:
> > > > 
> > > > >I am looking for a way to synchronize
> swapbuffers
> > > with
> > > > >the vertical retrace using lablg and lablgtk
> or
> > > labltk
> > > > >for creating the window to draw the opengl
> > > graphics
> > > > >in.
> > > > >Does anyone know if this is possible?
> > > > 
> > > > You usually have to do this through an
> extension. 
> > > It's a windowing system issue (or at least,
> that's
> > > how OpenGL thinks of it).  So, on windows
> there's a
> > > SwapInterval extension, and I'm not sure about
> X,
> > > but it's probably the same.
> > > > 
> > > > You'll need to write a thunk to the extension
> in C
> > > to use it, because lablgl does not support
> > > extensions yet.  I hope to fix this at some
> point
> > > soon. 
> > > 
> > > Does X not do this by himself, at least if you
> use
> > > hardware accelerated mesa
> > > drivers (the dri version of them). Not sure
> though.
> > 
> > 
> > I have looked into the examples that are provided
> with
> > lablgl and lablgtk and comparared it with the C
> > version of gears.c. You can notice a small
> disruption
> > in the animation gears.ml and planet.ml (when the
> > planet is closer and is displayed big on the
> screen).
> > This is due to that the swap buffer is done when
> the
> > monitors ray gun is in the middle of the graphics.
> > 
> > There are also some small and good tutorial
> examples
> > that uses C and glx that does not have this
> problem.
> > Here there is no disruption of the animation at
> all.
> > I can provide you with the link to this webpage
> when I
> > get access to the link.
> > 
> > It seems that it is up to the library that you use
> for
> > handling the window for opengl. Appearantly gtk
> and tk
> > does not do this syncronization.
> > glut, glx do this and I am almost sure that sdl do
> > that as well. 
> 
> mmm, ...
> 
> lablgl + lablgtk uses the gtkglarea library, if i am
> not wrong. Did you try
> the gtkglarea examples for the same thing ? 
> 
> Also what openGL lib are you using, what X server,
> what OS, what graphic card
> ? All of this may have an impact on the openGL
> display. Also are you using
> software rendreing or hardware ? try glxinfo to be
> sure.
> 
> Do you have an idea of what the C example you speak
> about do that is not done
> by lablgl ? 
> 
> Or maybe it is just the garbage collector quicking
> in, and thus slowing the
> display ?
> 

I tried the examples under the directory GL in the
lablgtk debian package, I think they use gtkglarea.

I am using
mesa/dri/Xfree4/linux/g400/hardwarerendering.

Open gl synchs with the vertical retrace in those C
tutorial examples 

http://nehe.gamedev.net/opengl.asp
(I tried the Texture mapping example)

The difference is that the C examples uses glx for the
window handling, 
I hope that the garbage collection does not affect the
synchronization.
I plan to try the ocamlsdl and see if it works with
that.
Otherwise I think Chris is right regarding this
extension for X, I don't remeber the exact name of it
but it exists a syncronization extension. I am looking
forward for new versions of lablgl that support this.

Another way to go would be to try ocamlsdl with
lablgl.

BR
Peter Rönnquist






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Re: [Caml-list] How to synchtonize swap buffers with vertical retrace in lablgk/lablgtk, or labgl/labltk,

[Peter Ronnquist]

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--- Chris Hecker <checker@d6.com> wrote:
> 
> >I am looking for a way to synchronize swapbuffers
> with
> >the vertical retrace using lablg and lablgtk or
> labltk
> >for creating the window to draw the opengl graphics
> >in.
> >Does anyone know if this is possible?
> 
> You usually have to do this through an extension. 
> It's a windowing system issue (or at least, that's
> how OpenGL thinks of it).  So, on windows there's a
> SwapInterval extension, and I'm not sure about X,
> but it's probably the same.
> 
> You'll need to write a thunk to the extension in C
> to use it, because lablgl does not support
> extensions yet.  I hope to fix this at some point
> soon. 
> 
> Chris
> 
> 

I am interested to look at this. I don't exactly know
where to start at this point but I will take a look at
xfree to get some more information.

Best Regards
Peter Rönnquist

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Re: [Caml-list] How to synchtonize swap buffers with vertical retrace in lablgk/lablgtk, or labgl/labltk,

[Peter Ronnquist]

--- Luc MAZARDO <Luc.Mazardo@cvf.fr> wrote:
> have you installed  freetype2-dev ??
> i miss to exit with error when i don't find
> freetype.h.
> i will fix it.
>

Hello Luc,

Yes I installed the freetype2-dev and the freetype.h
was found, this was alright.

The problem was that the freetype.h needed to have a
defined variable that stated from which directory to
include the file that had the TTF_.. structure
defined.

In short, there where no such define so this include
file was not included at all.
I added it to the make file and then it worked.
I can send you a more detailed report of the error if
you like.

So know I have run the samples/examlple.ml program. I
am now trying to modifiy this example to do some
animation to finally get to see a ocaml program
synchronise its graphics output with the vertical
retrace.

Thank you for your feedback, 
 
/Peter


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Re: [Caml-list] How to synchtonize swap buffers with vertical retrace in lablgk/lablgtk, or labgl/labltk,

[Peter Ronnquist]

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To compile ocaml sdl I needed to add 
-lSDL_ttf  to the CLIBS in OCamlSDL/src/Makefile.

Also  added -DHAVE_FREETYPE_FREETYPE_H to the CFLAGS
in OCamlSDL/makefile.toplevel

But I still don't sync with the vertical retrace.
I have a small test loop that do the following:

---------------------

...

let placement x y src dst =
  let h = surface_height src
  and w = surface_width src
  in
  let y_max = (surface_height dst) - h
  and x_max = (surface_width dst) - w
  in
let r_smiley = (Rect(x, 
		     y,
		     w,h))
and r_src = (surface_rect src)
    
in
surface_blit src r_src dst r_smiley;
update_rect dst r_smiley;;


(* The "main" loop *)
for i = 1 to 200 do       
(*      surface_blit icon r_src screen r_smiley;
   update_rect screen r_smiley;*)
  placement v.(0) 25 icon screen;
  v.(0) <- v.(0) +2;
  Sdltimer.delay 10; 
  Sdlvideo.flip screen;
done;

...
--------------------------

The Sdlvideo.flip should sync with vertical retrace if
sdl is initialized with SDL_DOUBLEBUF, SDL_HWSURFACE
and I also tried to add SDL_FULLSCREEN with the same
result.

According to the online documentation SDL_Flip will
wait for vertical retrace on hardware that supports
it. G400 supports it, at least glx manages to do it.

Thanks for any help,

Best Regards
Peter Rönnquist

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Re: [Caml-list] How to synchtonize swap buffers with vertical retrace in lablgk/lablgtk, or labgl/labltk,

[Peter Ronnquist]

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Some clarification, the behavior I get is that the
animation is not smooth. It is like the vetical
retrace is missed sometimes. 
It could be that it do the flip at the correcttime,
but that the loop sometimes takes too long so that one
vertical retrace is skipped.

Best Regards
Peter Rönnquist


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Re: [Caml-list] How to synchtonize swap buffers with vertical retrace in lablgk/lablgtk, or labgl/labltk,

[Sami Mäkelä]

Peter Ronnquist wrote:
> Some clarification, the behavior I get is that the
> animation is not smooth. It is like the vetical
> retrace is missed sometimes.
> It could be that it do the flip at the correcttime,
> but that the loop sometimes takes too long so that one
> vertical retrace is skipped.

Here are some tips about how to make it faster:

* Use Sdlvideo.surface_display_format to convert the
  image to faster format
* Set the color depth to the depth of your screen
* When using Sdlvideo.update_rect, Sdlvideo.flip is unnecessary.
  I don't know if update_rect waits for vertical retrace.
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Re: [Caml-list] How to synchtonize swap buffers with vertical retrace in lablgk/lablgtk, or labgl/labltk,

[Peter Ronnquist]

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--- Sami Mäkelä <sajuma@utu.fi> wrote:
> Peter Ronnquist wrote:
> > Some clarification, the behavior I get is that the
> > animation is not smooth. It is like the vetical
> > retrace is missed sometimes.
> > It could be that it do the flip at the
> correcttime,
> > but that the loop sometimes takes too long so that
> one
> > vertical retrace is skipped.
> 
> Here are some tips about how to make it faster:
> 
> * Use Sdlvideo.surface_display_format to convert the
>   image to faster format
> * Set the color depth to the depth of your screen
> * When using Sdlvideo.update_rect, Sdlvideo.flip is
> unnecessary.
>   I don't know if update_rect waits for vertical
retrace.

Thank you, the screen update was much faster with
update_rects. But it did not wait correctly for the
vertical retrace (it was barly noticeable though).

Best Regards 
Peter Rönnquist

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Re: [Caml-list] How to synchtonize swap buffers with vertical retrace in lablgk/lablgtk, or labgl/labltk,

[Peter Ronnquist]

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--- Luc MAZARDO <Luc.Mazardo@cvf.fr> wrote:
> > 
> > To compile ocaml sdl I needed to add 
> > -lSDL_ttf  to the CLIBS in OCamlSDL/src/Makefile.
> > 
> > Also  added -DHAVE_FREETYPE_FREETYPE_H to the
> CFLAGS
> > in OCamlSDL/makefile.toplevel
> > 
> > But I still don't sync with the vertical retrace.
> > I have a small test loop that do the following:
> if you do :
> $ make distclean 
> $ ./configure
> i think automatically -DHAVE_FREE... has be adding
> in CFLAGS
> and -LSDL_ttf to CLIBS...
> 
> try the latest release at ocamlSDL-0.5pre2 if you
> want at :
> 
>
http://prdownloads.sourceforge.net/ocamlsdl/OCamlSDL-0.5pre2.tar.gz
> 
> > The Sdlvideo.flip should sync with vertical
> retrace if
> > sdl is initialized with SDL_DOUBLEBUF,
> SDL_HWSURFACE
> > and I also tried to add SDL_FULLSCREEN with the
> same
> > result.
> i will modify the current video initialisation with
> a list of video_flags...
> 
> 
> 

Thank you, ocamlSDL-0.5pre2 worked directly.

Just a small note, to make ocamlsdl work the first
time I had to do a "ln -s libfreetype.so.6
libfreetype.so" in /usr/lib but that I think is the
responsibilty of the  libfreetype package of debian .

Best Regards
Peter Rönnquist

  

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