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Some restructuring of the driWaitForVBlank() code.

Browse source 
Also some minor fixes for detecting when the deadline is met or missed, in
particular wrt wraparounds of the sequence number.
This commit is contained in:
Michel Dänzer 2006-09-28 14:03:02 +00:00
parent 24bb3b3998
commit 6a2f5c6752
1 changed files with 32 additions and 28 deletions
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60
src/mesa/drivers/dri/common/vblank.c
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@ -260,7 +260,8 @@ void driDrawableInitVBlank( __DRIdrawablePrivate *priv, GLuint flags,
drmVBlank vbl = { .request={ .type = DRM_VBLANK_RELATIVE, .sequence = 0 } };
do_wait( &vbl, vbl_seq, priv->driScreenPriv->fd );
priv->pdraw->swap_interval = (flags & VBLANK_FLAG_THROTTLE) != 0 ? 1 : 0;
priv->pdraw->swap_interval = (flags & (VBLANK_FLAG_THROTTLE |
VBLANK_FLAG_SYNC)) != 0 ? 1 : 0;
}
}
@ -287,7 +288,7 @@ driWaitForVBlank( const __DRIdrawablePrivate *priv, GLuint * vbl_seq,
unsigned original_seq;
unsigned deadline;
unsigned interval;
unsigned diff;
*missed_deadline = GL_FALSE;
if ( (flags & (VBLANK_FLAG_INTERVAL |
@ -310,6 +311,21 @@ driWaitForVBlank( const __DRIdrawablePrivate *priv, GLuint * vbl_seq,
original_seq = *vbl_seq;
if ( (flags & VBLANK_FLAG_INTERVAL) != 0 ) {
interval = priv->pdraw->swap_interval;
/* this must have been initialized when the drawable was first bound
* to a direct rendering context. */
assert ( interval != (unsigned)-1 );
}
else if ( (flags & (VBLANK_FLAG_THROTTLE | VBLANK_FLAG_SYNC)) != 0 ) {
interval = 1;
}
else {
interval = 0;
}
deadline = original_seq + interval;
vbl.request.sequence = ((flags & VBLANK_FLAG_SYNC) != 0) ? 1 : 0;
vbl.request.type = DRM_VBLANK_RELATIVE;
@ -317,36 +333,24 @@ driWaitForVBlank( const __DRIdrawablePrivate *priv, GLuint * vbl_seq,
return -1;
}
diff = *vbl_seq - deadline;
/* No need to wait again if we've already reached the target */
if (diff <= (1 << 23)) {
*missed_deadline = (flags & VBLANK_FLAG_SYNC) ? (diff > 0) : GL_TRUE;
return 0;
}
/* Wait until the target vertical blank. */
vbl.request.type = DRM_VBLANK_ABSOLUTE;
vbl.request.sequence = deadline;
if ( (flags & VBLANK_FLAG_INTERVAL) != 0 ) {
interval = priv->pdraw->swap_interval;
/* this must have been initialized when the drawable was first bound
* to a direct rendering context. */
assert ( interval != (unsigned)-1 );
}
else if ( (flags & VBLANK_FLAG_THROTTLE) != 0 ) {
interval = 1;
}
else {
interval = 0;
if ( do_wait( & vbl, vbl_seq, priv->driScreenPriv->fd ) != 0 ) {
return -1;
}
/* Wait until the next vertical blank. If the interval is zero, then
* the deadline is one vertical blank after the previous wait.
*/
vbl.request.sequence = original_seq + interval;
if ( *vbl_seq < vbl.request.sequence ) {
if ( do_wait( & vbl, vbl_seq, priv->driScreenPriv->fd ) != 0 ) {
return -1;
}
}
deadline = original_seq + ((interval == 0) ? 1 : interval);
*missed_deadline = ( *vbl_seq > deadline );
diff = *vbl_seq - deadline;
*missed_deadline = diff > 0 && diff <= (1 << 23);
return 0;
}