Make driDrawableInitVBlank() initialize the sequence number.

This prevents the first wait for vertical blank from timing out when the X
server has been running for a long time.

2 files changed, 21 insertions, 15 deletions

diff --git a/src/mesa/drivers/dri/common/vblank.c b/src/mesa/drivers/dri/common/vblank.c
index eebe42d96a1..25b912e8242 100644
--- a/src/mesa/drivers/dri/common/vblank.c
+++ b/src/mesa/drivers/dri/common/vblank.c
@@ -210,20 +210,6 @@ GLuint driGetDefaultVBlankFlags( const driOptionCache *optionCache )
 
 /****************************************************************************/
 /**
- * Sets the default swap interval when the drawable is first bound to a
- * direct rendering context.
- */
-
-void driDrawableInitVBlank( __DRIdrawablePrivate *priv, GLuint flags )
-{
-   if ( priv->pdraw->swap_interval == (unsigned)-1 ) {
-      priv->pdraw->swap_interval = (flags & VBLANK_FLAG_THROTTLE) != 0 ? 1 : 0;
-   }
-}
-
-
-/****************************************************************************/
-/**
  * Wrapper to call \c drmWaitVBlank.  The main purpose of this function is to
  * wrap the error message logging.  The error message should only be logged
  * the first time the \c drmWaitVBlank fails.  If \c drmWaitVBlank is
@@ -262,6 +248,25 @@ static int do_wait( drmVBlank * vbl, GLuint * vbl_seq, int fd )
 
 /****************************************************************************/
 /**
+ * Sets the default swap interval when the drawable is first bound to a
+ * direct rendering context.
+ */
+
+void driDrawableInitVBlank( __DRIdrawablePrivate *priv, GLuint flags,
+			    GLuint *vbl_seq )
+{
+   if ( priv->pdraw->swap_interval == (unsigned)-1 ) {
+      /* Get current vertical blank sequence */
+      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;
+   }
+}
+
+
+/****************************************************************************/
+/**
  * Waits for the vertical blank for use with glXSwapBuffers.
  * 
  * \param vbl_seq  Vertical blank sequence number (MSC) after the last buffer
diff --git a/src/mesa/drivers/dri/common/vblank.h b/src/mesa/drivers/dri/common/vblank.h
index 3dc965def1a..2663956858d 100644
--- a/src/mesa/drivers/dri/common/vblank.h
+++ b/src/mesa/drivers/dri/common/vblank.h
@@ -47,7 +47,8 @@ extern int driGetMSC32( __DRIscreenPrivate * priv, int64_t * count );
 extern int driWaitForMSC32( __DRIdrawablePrivate *priv,
     int64_t target_msc, int64_t divisor, int64_t remainder, int64_t * msc );
 extern GLuint driGetDefaultVBlankFlags( const driOptionCache *optionCache );
-extern void driDrawableInitVBlank ( __DRIdrawablePrivate *priv, GLuint flags );
+extern void driDrawableInitVBlank ( __DRIdrawablePrivate *priv, GLuint flags,
+				    GLuint *vbl_seq );
 extern int driWaitForVBlank( const __DRIdrawablePrivate *priv,
     GLuint * vbl_seq, GLuint flags, GLboolean * missed_deadline );