3 files changed, 36 insertions, 9 deletions

diff --git a/src/mesa/drivers/dri/common/dri_util.c b/src/mesa/drivers/dri/common/dri_util.c
index fc7755797d6..ba677f6ff86 100644
--- a/src/mesa/drivers/dri/common/dri_util.c
+++ b/src/mesa/drivers/dri/common/dri_util.c
@@ -435,6 +435,27 @@ const __DRIcopySubBufferExtension driCopySubBufferExtension = {
     { __DRI_COPY_SUB_BUFFER }, driCopySubBuffer
 };
 
+static void driSetSwapInterval(__DRIdrawable *drawable, unsigned int interval)
+{
+    __DRIdrawablePrivate *dpriv = drawable->private;
+
+    dpriv->swap_interval = interval;
+}
+
+static unsigned int driGetSwapInterval(__DRIdrawable *drawable)
+{
+    __DRIdrawablePrivate *dpriv = drawable->private;
+
+    return dpriv->swap_interval;
+}
+
+const __DRIswapControlExtension driSwapControlExtension = {
+    { __DRI_SWAP_CONTROL },
+    driSetSwapInterval,
+    driGetSwapInterval
+};
+
+
 /**
  * This is called via __DRIscreenRec's createNewDrawable pointer.
  */
@@ -501,7 +522,7 @@ static void *driCreateNewDrawable(__DRIscreen *screen,
      * default value when the drawable is first bound to a direct
      * rendering context. 
      */
-    pdraw->swap_interval = (unsigned)-1;
+    pdp->swap_interval = (unsigned)-1;
 
     pdp->swapBuffers = psp->DriverAPI.SwapBuffers;
 
@@ -716,7 +737,7 @@ void * __DRI_CREATE_NEW_SCREEN( int scrn, __DRIscreen *psc,
 			     
 {
     __DRIscreenPrivate *psp;
-    static const __DRIextension emptyExtensionList[] = { NULL };
+    static const __DRIextension *emptyExtensionList[] = { NULL };
     dri_interface = interface;
     api_ver = internal_api_version;
 
@@ -868,8 +889,7 @@ driCalculateSwapUsage( __DRIdrawablePrivate *dPriv, int64_t last_swap_ust,
 
 
    if ( (*dri_interface->getMSCRate)(dPriv->pdraw, &n, &d) ) {
-      interval = (dPriv->pdraw->swap_interval != 0)
-	  ? dPriv->pdraw->swap_interval : 1;
+      interval = (dPriv->swap_interval != 0) ? dPriv->swap_interval : 1;
 
 
       /* We want to calculate
diff --git a/src/mesa/drivers/dri/common/dri_util.h b/src/mesa/drivers/dri/common/dri_util.h
index 59bb66d21bc..78320307d60 100644
--- a/src/mesa/drivers/dri/common/dri_util.h
+++ b/src/mesa/drivers/dri/common/dri_util.h
@@ -77,6 +77,7 @@ extern __GLcontextModes *__driDriverInitScreen(__DRIscreenPrivate *psp);
  * Extensions.
  */
 extern const __DRIcopySubBufferExtension driCopySubBufferExtension;
+extern const __DRIswapControlExtension driSwapControlExtension;
 
 /**
  * Used by DRI_VALIDATE_DRAWABLE_INFO
@@ -327,6 +328,12 @@ struct __DRIdrawablePrivateRec {
      * Called via glXSwapBuffers().
      */
     void (*swapBuffers)( __DRIdrawablePrivate *dPriv );
+
+    /**
+     * Controls swap interval as used by GLX_SGI_swap_control and
+     * GLX_MESA_swap_control.
+     */
+    unsigned int swap_interval;
 };
 
 /**
diff --git a/src/mesa/drivers/dri/common/vblank.c b/src/mesa/drivers/dri/common/vblank.c
index e7ed545f13c..3b5acfecb12 100644
--- a/src/mesa/drivers/dri/common/vblank.c
+++ b/src/mesa/drivers/dri/common/vblank.c
@@ -255,13 +255,13 @@ static int do_wait( drmVBlank * vbl, GLuint * vbl_seq, int fd )
 void driDrawableInitVBlank( __DRIdrawablePrivate *priv, GLuint flags,
 			    GLuint *vbl_seq )
 {
-   if ( priv->pdraw->swap_interval == (unsigned)-1 ) {
+   if ( priv->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 |
-					     VBLANK_FLAG_SYNC)) != 0 ? 1 : 0;
+      priv->swap_interval = (flags & (VBLANK_FLAG_THROTTLE |
+				      VBLANK_FLAG_SYNC)) != 0 ? 1 : 0;
    }
 }
 
@@ -277,9 +277,9 @@ 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 );
+      assert ( priv->swap_interval != (unsigned)-1 );
 
-      return priv->pdraw->swap_interval;
+      return priv->swap_interval;
    }
    else if ( (flags & (VBLANK_FLAG_THROTTLE | VBLANK_FLAG_SYNC)) != 0 ) {
       return 1;