[gameprogrammer] Re: OpenGL + SDL + multi-threading + Theora

hey dude i really wanna make a 3d game an im still learniing could u tell me
wat engine or language to use thanx

On 8/28/07, richard sabbarton <richard.sabbarton@xxxxxxxxx> wrote:
>
> Excellent...  Glad I could help!
>
> I have not used SDL so I am afraid I don't have any suggestions regarding
> the audio.  Start a new thread if you have problems.
>
> Rich
>
>
> On 28/08/07, Husam Zakaria <hzcppff@xxxxxxxxx> wrote:
> >
> > Sorry to be late for my replay, thank you for you suggestion, it's
> > working fine, I rendered it to a memory bitmap and then in the main thread I
> > rendered it from the memory bitmap, and as you said I used a BMP pair to
> > avoid errors and set a flag to show which one the main thread will use, and
> > it's working fine.
> >
> > now I'll have to work for the sound, which will use virbos, so any
> > suggestions for how I can do it in with SDL_Mixer?
> >
> >
> > On 8/22/07, richard sabbarton <richard.sabbarton@xxxxxxxxx > wrote:
> > >
> > > Hi There,
> > >
> > > I ran into similar problem with OpenGL and Multi-Threading.  I was
> > > able to generate textures without errors but they never displayed 
> > > correctly
> > > in the application.  I think you run into problems because of the 
> > > glBegin()
> > > and glEnd() in your Main Thread.  You can't manipulate Textures between
> > > these (I think from memory) and you cannot guaranty the current status of
> > > you main thread when generating the texture.
> > >
> > > What you could try is decoding the video frames to a Memory Bitmap and
> > > then generate the Texture in your main thread from the memory BMP.  Also,
> > > you could use a BMP pair and alternate between them for each frame.  You 
> > > can
> > > then set a flag to show which one the main thread should use.  This will
> > > avoid errors as you are likely to render each frame a different number of
> > > times depending on the speed of your main thread.
> > >
> > > I have not done this myself but it should be possible.  This was my
> > > planned workaround but I never got as far as coding it. My wife had a baby
> > > and I haven't looked at a line of code since!  He's two months old now.
> > > Maybe I can start sneaking back to the keyboard while my wife isn't
> > > looking...
> > >
> > > Let me know if it works or if you try it.
> > >
> > > Rich
> > >
> > >
> > >  On 22/08/07, Husam Zakaria < hzcppff@xxxxxxxxx > wrote:
> > >
> > > > Hi, every one
> > > >
> > > > I am working on an application that can play theora ogg file using
> > > > OpenGL and SDL, and I looked at the Nebula Device 2 nOggTheoraplayer
> > > >
> > > > class at this link:
> > > >
> > > > http://nebuladevice.cubik.org/documentation/nebula2/classnOggTheoraPlayer.shtml
> > > >
> > > >
> > > > and build my class the same way they build it, but the problem is
> > > > that
> > > > I don't know how to play the video with such heirarcy.
> > > > so I decide to create a thread that decode the video frames and
> > > > render
> > > > the decoded frames to a texture, and in the main thread I will
> > > > render
> > > > this texture to the screen for every frame.
> > > >
> > > > the problem is that I created the texture in the main thread and
> > > > then
> > > > I created the thread that will render to this texture, and when I
> > > > want
> > > > to render to this texture I call the following code to be sure that
> > > > the texture has been created:
> > > >
> > > >     assert(glIsTexture(texture_id));
> > > >
> > > > when the application run the assertion will cut the program
> > > > indecating
> > > > that the texture isn't valid, so why does that happend?!! I am sure
> > > > that I create the texture in the main thread with the same id, so
> > > > what
> > > > I can do to solve this?
> > > >
> > > > ---------------------
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> > > >
> > > >
> > > >
> > >
> >
>


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