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Add driGetVBlankInterval() helper function.

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This can be used by drivers to determine the current swap interval of a
drawable.
This commit is contained in:
Michel Dänzer 2006-09-28 14:04:19 +00:00
parent 7539fde334
commit 7585fc989d
2 changed files with 27 additions and 14 deletions
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39
src/mesa/drivers/dri/common/vblank.c
View file

@ -266,6 +266,30 @@ void driDrawableInitVBlank( __DRIdrawablePrivate *priv, GLuint flags,
}
/****************************************************************************/
/**
* Returns the current swap interval of the given drawable.
*/
unsigned
driGetVBlankInterval( const __DRIdrawablePrivate *priv, GLuint flags )
{
if ( (flags & VBLANK_FLAG_INTERVAL) != 0 ) {
/* this must have been initialized when the drawable was first bound
* to a direct rendering context. */
assert ( priv->pdraw->swap_interval != (unsigned)-1 );
return priv->pdraw->swap_interval;
}
else if ( (flags & (VBLANK_FLAG_THROTTLE | VBLANK_FLAG_SYNC)) != 0 ) {
return 1;
}
else {
return 0;
}
}
/****************************************************************************/
/**
* Waits for the vertical blank for use with glXSwapBuffers.
@ -310,20 +334,7 @@ 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;
}
interval = driGetVBlankInterval(priv, flags);
deadline = original_seq + interval;
vbl.request.type = DRM_VBLANK_RELATIVE;

2
src/mesa/drivers/dri/common/vblank.h
View file

@ -51,6 +51,8 @@ extern int driWaitForMSC32( __DRIdrawablePrivate *priv,
extern GLuint driGetDefaultVBlankFlags( const driOptionCache *optionCache );
extern void driDrawableInitVBlank ( __DRIdrawablePrivate *priv, GLuint flags,
GLuint *vbl_seq );
extern unsigned driGetVBlankInterval( const __DRIdrawablePrivate *priv,
GLuint flags );
extern int driWaitForVBlank( const __DRIdrawablePrivate *priv,
GLuint * vbl_seq, GLuint flags, GLboolean * missed_deadline );