[Libvisual-devel] Fwd: question about libvisual_gl_lv_flower

[Julien I. <jul...@gm...>]

Hi,
I built and install the libvisual and libvisual-plugins from svn sources.
Now, what is the fastest way to try libvisual_gl_lv_flower ? (any tool /
command line ?)
Sincerely
Julien


2011/12/16 Antti Silvast <ant...@ik...>

> Hi Julien,
>
> Thank you for pointing this out. This is indeed an omission: there
> should be a glPushMatrix as well.
>
> void render_flower_effect(FlowerInternal *flower) {
>
>      glClearColor(col1[0],col1[1],col1[2],0.0);
>      glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
>      glMatrixMode (GL_PROJECTION);
>      glLoadIdentity ();
>      gluPerspective(60.0, (float)flower->width/(float)flower->height,
> 0.01, 1135.0);
>
>      glMatrixMode (GL_MODELVIEW);
>      glLoadIdentity ();
>
>      glPushMatrix(); // ADD THIS HERE! -AS
>
>      glTranslatef(0.0,0.0,-1.0);
>
>      lights(flower);
>      glPopMatrix();
>      flower->posz=FR*flower->posz_new+(1.0-FR)*flower->posz;
>      glTranslatef(0.0,0.0,-flower->posz);
>
>      glRotatef(flower->rotx,1.0,0.0,0.0);
>      glRotatef(flower->roty,0.0,1.0,0.0);
>
> glRotatef(visual_timer_elapsed_msecs(&flower->timer)*0.02,0.0,0.0,1.0);
>      render_flower(flower);
> }
>
> I guess the push-pop is needed to translate the lights, which are always
> posited in z=-1.0, which are not like the flower, which may be in
> various z-positions.
>
> Let me know if this helps.
>
> All the best,
>
> Antti
>
> On Fri, 2011-12-16 at 12:23 +0100, Julien Isorce wrote:
> > Hi,
> >
> > In the source code of gl_lv_flower there is a glPopMatrix but there is
> > no glPushMatrix before. The result is a GL_STACK_UNDERFLOW.
> > Any reason for that ?
> >
> >
> > The code of libvisual_gl_lv_flower is
> > there :
> http://libvisual-plugins.sourcearchive.com/documentation/0.4.0.dfsg.1/main_8c-source.html
> >
> >
> > All libvisual plugins are
> > there:
> http://libvisual-plugins.sourcearchive.com/documentation/0.4.0.dfsg.1/files.html
> >
> >
> > Sincerely
> > Julien
>
>
>