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/auxiliary/util/u_rect.c b/src/gallium/auxiliary/util/u_rect.c
index 6e24e594e4..74259d453b 100644
--- a/src/gallium/auxiliary/util/u_rect.c
+++ b/src/gallium/auxiliary/util/u_rect.c
@@ -218,8 +218,8 @@ util_surface_copy(struct pipe_context *pipe,
    pipe->screen->transfer_unmap(pipe->screen, src_trans);
    pipe->screen->transfer_unmap(pipe->screen, dst_trans);
 
-   screen->tex_transfer_release(screen, &src_trans);
-   screen->tex_transfer_release(screen, &dst_trans);
+   screen->tex_transfer_destroy(src_trans);
+   screen->tex_transfer_destroy(dst_trans);
 }
 
 
@@ -297,5 +297,5 @@ util_surface_fill(struct pipe_context *pipe,
    }
 
    pipe->screen->transfer_unmap(pipe->screen, dst_trans);
-   screen->tex_transfer_release(screen, &dst_trans);
+   screen->tex_transfer_destroy(dst_trans);
 }