gallium: Unify reference counting.

The core reference counting code is centralized in p_refcnt.h.

This has some consequences related to struct pipe_buffer:

* The screen member of struct pipe_buffer must be initialized, or
  pipe_buffer_reference() will crash trying to destroy a buffer with reference
  count 0. u_simple_screen takes care of this, but I may have missed some of
  the drivers not using it.
* Except for rare exceptions deep in winsys code, buffers must always be
  allocated via pipe_buffer_create() or via screen->*buffer_create() rather
  than via winsys->*buffer_create().

1 files changed, 2 insertions, 2 deletions

diff --git a/src/gallium/winsys/g3dvl/xsp_winsys.c b/src/gallium/winsys/g3dvl/xsp_winsys.c
index c4623e82f9..5b9fdb5c1f 100644
--- a/src/gallium/winsys/g3dvl/xsp_winsys.c
+++ b/src/gallium/winsys/g3dvl/xsp_winsys.c
@@ -39,7 +39,7 @@ static struct pipe_buffer* xsp_buffer_create(struct pipe_winsys *pws, unsigned a
 	assert(pws);
 
 	buffer = calloc(1, sizeof(struct xsp_buffer));
-	buffer->base.refcount = 1;
+	pipe_reference_init(&buffer->base.reference, 1);
 	buffer->base.alignment = alignment;
 	buffer->base.usage = usage;
 	buffer->base.size = size;
@@ -55,7 +55,7 @@ static struct pipe_buffer* xsp_user_buffer_create(struct pipe_winsys *pws, void
 	assert(pws);
 
 	buffer = calloc(1, sizeof(struct xsp_buffer));
-	buffer->base.refcount = 1;
+	pipe_reference_init(&buffer->base.reference, 1);
 	buffer->base.size = size;
 	buffer->is_user_buffer = TRUE;
 	buffer->data = data;