dri2: Handle reference counting across page flipping

1. Instead of swapping bos, swap the entire private structure.

2. If we update the pixmap bo for the Screen, make sure we update the
reference inside intel->front_buffer so that xrandr still functions.

Fixes:

  Bug 27922 - i965: Rapidly resizing OpenGL window causes GPU to hang.
  https://bugs.freedesktop.org/show_bug.cgi?id=27922

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 11 insertions, 1 deletions

diff --git a/src/i830.h b/src/i830.h
index fdaa47ee..9e1b4ca2 100644
--- a/src/i830.h
+++ b/src/i830.h
@@ -154,7 +154,17 @@ struct intel_pixmap {
 	struct list flush, batch, in_flight;
 };
 
-struct intel_pixmap *i830_get_pixmap_intel(PixmapPtr pixmap);
+extern int uxa_pixmap_index;
+
+static inline struct intel_pixmap *i830_get_pixmap_intel(PixmapPtr pixmap)
+{
+	return dixLookupPrivate(&pixmap->devPrivates, &uxa_pixmap_index);
+}
+
+static inline void i830_set_pixmap_intel(PixmapPtr pixmap, struct intel_pixmap *intel)
+{
+	dixSetPrivate(&pixmap->devPrivates, &uxa_pixmap_index, intel);
+}
 
 static inline Bool i830_uxa_pixmap_is_dirty(PixmapPtr pixmap)
 {