[MPlayer-dev-eng] [PATCH] vo_gl2.c - glClear every frame in fullscreen mode

[Reimar Döffinger]

> On Sun, 16 Nov 2003 19:19:04 +0100
> Timo Kanera <timo at kanera.de> wrote:
>
> > Hi,
> >
> > the attached patch modifies vo_gl2.c to perform a
glClear(GL_COLOR_BUFFER_BIT)
> > for every frame when in fullscreen mode. This seems to be needed because
of the
> > way glXSwapBuffers works. From the glXSwapBuffers manpage:
> >
> > The contents of the back buffer become undefined after a swap. Note that
this
> > applies to pixel buffers as well as windows.
>
>
> Why does that only matter in fullscreen ?

Because in windowed mode all of the window is used to draw the movie , so
the framebuffer gets "cleared" by the movie drawing function.
Probably the cleaner solution would be to clear it always, but I don't know
how high the performance penalty would be (e.g. with only software OpenGL).
And currently noone seems to have problems in windowed mode...

Greetings,
Reimar Döffinger