State handling of Wireframe different?

Mario Veraart (rioj7++at++fel.tno.nl)
Wed, 2 Sep 1998 22:41:12 MET-1DST

• Next message: Tagore D. Smith: "Polygon limit in geoset with chan->pick()?"
• Previous message: Les Elkins: "Draw callback invoked twice?"

I have an application in which I want to toggle some state elements
on a per window/channel basis. They are wireframe and texture.

In the draw callback I use te following code

static void DrawFunc (pfChannel *chan, void *data)
{
    PreDraw (chan, data);
    pfDraw ();
    PostDraw (chan, data);
}

static void PreDraw (pfChannel *chan, void *data) {

    pfClearChan (chan);

    ....
    if (chandata->texture)
        pfEnable(PFEN_TEXTURE);
    else
        pfDisable(PFEN_TEXTURE);
    if (chandata->wireframe)
        pfEnable(PFEN_WIREFRAME);
    else
        pfDisable(PFEN_WIREFRAME);
    pfOverride (PFSTATE_ENTEXTURE |
                PFSTATE_ENWIREFRAME, PF_ON);
}

static void PostDraw (pfChannel *chan, void *data)
{
    /* release the overrides so the next window can set them */
    pfOverride (PFSTATE_ENTEXTURE |
                PFSTATE_ENWIREFRAME, PF_OFF);
}

Then I can set texture on/off on a per window basis but the
wireframe is on or off in both windows.

If I change the draw callback to

static void DrawFunc (pfChannel *chan, void *data)
{
    pfPushState();
    PreDraw (chan, data);
    pfDraw ();
    PostDraw (chan, data);
    pfPopState();
}

Then I can set wireframe on a per window basis.

Why do I need the push and pop of the performer state?
I use performer 2.0.4.

Mario

• Next message: Tagore D. Smith: "Polygon limit in geoset with chan->pick()?"
• Previous message: Les Elkins: "Draw callback invoked twice?"

This archive was generated by hypermail 2.0b2 on Wed Sep 02 1998 - 13:42:14 PDT

This message has been cleansed for anti-spam protection. Replace '++at++' in any mail addresses with the '@' symbol.