karim.atiki@[EMAIL PROTECTED]
wrote:
> Hi all,
>
> I'm experiencing a strange issue.
> I display an image which is a textured quad in RGB format.
>
> I try to display a transparent rectangle over it.
> I use the following code:
>
> glPushMatrix();
> glEnable(GL_BLEND);
> glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
> glColor4d(0.0, 0.0, 1.0, 0.5);
> glRecti(rc.left(), rc.top(), rc.right(), rc.bottom());
> glDisable(GL_BLEND);
> glPopMatrix();
>
> It works fine.
> But with some images, the rectangle is not transparent blue, but BLACK
> transparent...
> And I just can't figure out what's the trick.
> It is a simple PNG image (RGB) and it is just well displayed on scrren
> though.
>
> Any idea or suggestion ?
As a wild guess, do you need to disable texture mapping?
--
Andy V
|
