It seems to manifest itself on all the tutorial examples, but it's just hard
to see sometimes. The below application slides a big white box
across the screen making it very obvious (I took the 'text' example and
hacked it up).
////////////////////////////////////////////////////////////////////////////
//////////////
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <directfb.h>
/*
* (Globals)
*/
static IDirectFB *dfb = NULL;
static IDirectFBSurface *primary = NULL;
static int screen_width = 0;
static int screen_height = 0;
#define DFBCHECK(x...) \
{ \
DFBResult err = x; \
\
if (err != DFB_OK) \
{ \
fprintf( stderr, "%s <%d>:\n\t", __FILE__, __LINE__ ); \
DirectFBErrorFatal( #x, err ); \
exit(-1); \
} \
}
int main (int argc, char **argv)
{
int i;
/*
* (Locals)
*/
DFBSurfaceDescription dsc;
/*
* (Initialize)
*/
DFBCHECK (DirectFBInit (&argc, &argv));
DFBCHECK (DirectFBCreate (&dfb));
DFBCHECK (dfb->SetCooperativeLevel (dfb, DFSCL_FULLSCREEN));
dsc.flags = DSDESC_CAPS;
dsc.caps = DSCAPS_PRIMARY | DSCAPS_FLIPPING;
DFBCHECK (dfb->CreateSurface( dfb, &dsc, &primary ));
DFBCHECK (primary->GetSize (primary, &screen_width, &screen_height));
// clear the front and back surfaces
DFBCHECK (primary->SetColor (primary, 0x0, 0x0, 0x0, 0xFF));
DFBCHECK (primary->FillRectangle (primary, 0, 0, screen_width,
screen_height));
DFBCHECK (primary->Flip (primary, NULL, DSFLIP_WAITFORSYNC));
DFBCHECK (primary->SetColor (primary, 0x0, 0x0, 0x0, 0xFF));
DFBCHECK (primary->FillRectangle (primary, 0, 0, screen_width,
screen_height));
DFBCHECK (primary->Flip (primary, NULL, DSFLIP_WAITFORSYNC));
for (i = screen_width; i > 0; i--)
{
int x,y,width,height;
height = 400;
x = i - 1;
y = (screen_height / 2) - (height / 2);
width = screen_width - i + 1;
DFBCHECK (primary->SetColor (primary, 0x0, 0x0, 0x0, 0xFF));
DFBCHECK (primary->FillRectangle (primary, x,y,width,height));
DFBCHECK (primary->SetColor (primary, 0xff, 0xff, 0xff, 0xFF));
DFBCHECK (primary->FillRectangle (primary, x,y,width,height));
DFBCHECK (primary->Flip (primary, NULL, DSFLIP_WAITFORSYNC));
/* comment this in to make it work
usleep(1);
*/
}
/*
* (Release)
*/
primary->Release (primary);
dfb->Release (dfb);
return 23;
}
////////////////////////////////////////////////////
----- Original Message -----
From: "Sven Neumann" <[EMAIL PROTECTED]>
To: "Neil Radisch" <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Wednesday, February 19, 2003 12:06 PM
Subject: [directfb-dev] Re: Matrox video tearing
> Hi,
>
> Neil Radisch <[EMAIL PROTECTED]> writes:
>
> > There seems to be a problem with flipping and waiting for
> > sync (Matrox Millennium card). I took the "text" program
> > from the DFBTutorials and modified it so it only erases the
> > rectangle with the text instead of the whole screen. The
> > program no longer waits for sync and text flies across
> > the screen, tearing the whole way.
>
> we won't be able to debug your problem unless you send us a diff
> (preferably unified) of the changes you did to the code.
>
>
> Salut, Sven
>
>
>
> --
> Info: To unsubscribe send a mail to [EMAIL PROTECTED] with
> "unsubscribe directfb-dev" as subject.
>
--
Info: To unsubscribe send a mail to [EMAIL PROTECTED] with
"unsubscribe directfb-dev" as subject.
