Re: Question regarding OpenGL implementation in TORCS

Hi,

I remembered that a documentation package was once mentioned
by Bernhard. Here it is:

https://sourceforge.net/projects/torcs/files/api-docs/1.3.7/
https://sourceforge.net/projects/torcs/files/api-docs/1.3.7/torcs-1.3.7-apidoc.tar.bz2/download

To see the contents without navigating a huge directory:
(extract archive, then view)
tar -xjvf torcs-1.3.7-apidoc.tar.bz2
firefox torcs-1.3.7-apidoc/index.html


----- Konstantin Ritt wrote:
> Hi,
> 
> Thanks David for your hint.
> I am still struggling to find my way through to the right file(s) or
> method(s). I actually identified different files as being important to the
> rendering of the driving/game scenes, such as
> src/modules/graphic/ssggraph/grmain.cpp and grscreen.cpp where the actual
> drawing happens.
> I want to state again what I am trying to achieve, maybe someone can direct
> me into the right direction then.
> My goal is to create a FBO (frame buffer object) that is connected to a
> texture unit. To this texture unit I want to render the frames to perform
> post processing.
> I found that the central rendering happens in the following manner:
> 
>    - src/libs/raceengineclient/raceengine.cpp int ReUpdate(void) calls
>    ReInfo->_reGraphicItf.refresh(ReInfo->s) to update the current situation s
>    - src/modules/graphic/ssggraph/grmain.cpp contains this refresh
>    function. In this refresh function it is iterated through all active
>    screens by calling grScreens[i]->update
>    - src/modules/graphic/ssggraph/grscreen.cpp contains this update
>    function. camDraw is called (same class) which again calls grDrawScene()
>    - src/modules/graphic/ssggraph/grscene.cpp contains this grDrawScene
>    function, where the whole scene is passed to ssgCullAndDraw to be rendered.
> 
> In the beginning of grmain.cpp: refresh(Situation s) I set up the FBO. All
> rendering should be performed to the texture of the FBO then (tested all
> this with a smaller application).
> 
> After the call to grScreens[0]->update(s, grFps) I unbind the FBO and
> (currently) use the information from the FBO texture to render back to the
> screen. However, only some textures (of trees, grass etc.) make it to the
> texture in the FBO, but not the whole scene.
> 
> Any ideas what and where it could go wrong?
> 
> I can gladly share the implementation of the FBO as well, but as stated
> above, I tested the principle of the FBO with a simple application and got
> it working. I therefore think the problem lies in my limited understanding
> of the Torcs OpenGL pipeline and that I did not place it correctly.
> 
> Cheers and thanks for all your help,
> 
> Konstantin
> 
> 
> 
> 
> 
> On Thu, Apr 27, 2017 at 7:52 AM, David Savinkoff wrote:
> 
> > ----- Konstantin Ritt wrote:
> > > Hello,
> > >
> > > I just starting using TORCS for my masters thesis. I am currently trying
> > to
> > > gain some knowledge about usage of OpenGL and was wondering if you could
> > > give a quick shout on where and how the OpenGL pipeline is handled in
> > TORCS?
> >
> > I don't know, but see below.
> >
> > > What I am trying to do is to create another buffer to write frames to,
> > as a
> > > texture, before they are displayed on the screen. With these textures I
> > > want to perform postprocessing purely by using shaders to keep all memory
> > > and computation on the GPU in order to reduce impact on the runtime of
> > the
> > > simulation.
> > > I would highly appreciate it if you could give me some short advice to
> > save
> > > me time sorting through the immense framework of TORCS. Thanks a lot in
> > > advance!
> > >
> > > Kind regards,
> > > Konstantin
> >
> > Hi,
> > I found that the following files have 99.99% of torcs gl code in them:
> >
> > torcs/src/libs/tgfclient/gui.cpp
> > torcs/src/libs/tgfclient/img.cpp
> > torcs/src/libs/tgfclient/screen.cpp
> > torcs/src/libs/tgfclient/guibutton.cpp
> > torcs/src/libs/tgfclient/guiedit.cpp
> > torcs/src/libs/tgfclient/guifont.cpp
> > torcs/src/libs/tgfclient/glfeatures.cpp
> > torcs/src/libs/tgfclient/guiscrollist.cpp
> > torcs/src/libs/confscreens/mouseconfig.cpp
> > torcs/src/libs/confscreens/joystickconfig.cpp
> > torcs/src/libs/confscreens/controlconfig.cpp
> > torcs/src/libs/raceengineclient/raceengine.cpp
> > torcs/src/libs/raceengineclient/racegl.cpp
> > torcs/src/libs/client/splash.cpp
> > torcs/src/libs/musicplayer/musicplayer.cpp
> >
> > ( find . -type f -print0 | xargs -0 grep -Iw gl.* )
> >


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