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, 3 insertions, 3 deletions

diff --git a/src/gallium/drivers/cell/ppu/cell_fence.c b/src/gallium/drivers/cell/ppu/cell_fence.c
index 32dbf5706c..13125a9fa3 100644
--- a/src/gallium/drivers/cell/ppu/cell_fence.c
+++ b/src/gallium/drivers/cell/ppu/cell_fence.c
@@ -96,7 +96,7 @@ cell_add_buffer_to_list(struct cell_context *cell,
    struct cell_buffer_node *node = CALLOC_STRUCT(cell_buffer_node);
    /* create new list node which references the buffer, insert at head */
    if (node) {
-      pipe_buffer_reference(ps, &node->buffer, buffer);
+      pipe_buffer_reference(&node->buffer, buffer);
       node->next = list->head;
       list->head = node;
    }
@@ -127,10 +127,10 @@ cell_free_fenced_buffers(struct cell_context *cell,
          pipe_buffer_unmap(ps, node->buffer);
 #if 0
          printf("Unref buffer %p\n", node->buffer);
-         if (node->buffer->refcount == 1)
+         if (node->buffer->reference.count == 1)
             printf("   Delete!\n");
 #endif
-         pipe_buffer_reference(ps, &node->buffer, NULL);
+         pipe_buffer_reference(&node->buffer, NULL);
          FREE(node);
          node = next;
       }