Overlay plane....

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Guy Premont (silicon-worlds++at++calva.net)
Mon, 16 Dec 1996 16:29:41 +0100

Hi,

I'm porting a Performer application to a Indigo2 Max Impact and I'm
having some trouble with the porting of functions related to the overlay
plane.

This application was running on an Onyx (Irix 5.3 Performer 2.0 & GL)
and the porting is towards a Max Impact (Irix 6.2 Performer 2.1 &
OpenGL). The porting is rather simple and direct however when I want to
put a picture on the overlay plane troubles arrive.

In my draw process, I was simply doing
        drawmode(OVERLAY);
        lrectwrite(...);
        drawmode(NORMALDRAW);
and it worked fast and painlessly.

Now, i'm trying something like:
         pwOver = pfGetPWinOverlayWin(pw);
        pfSelectWin(pwOver);
         glMatrixMode( GL_MODELVIEW ); glPushMatrix(); glLoadIdentity();
        glMatrixMode( GL_PROJECTION ); glPushMatrix(); glLoadIdentity();

        glOrtho( ... );
        glRasterPos2i(x, y);
        glDrawPixels(...);
        glMatrixMode( GL_MODELVIEW ); glPopMatrix();
        glMatrixMode( GL_PROJECTION ); glPopMatrix();
        pfSelectPWin(pw);

But it doesn't work.

Could somebody give my a hint?

Thanks,
Guy Premont

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