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, 8 insertions, 8 deletions

diff --git a/src/gallium/auxiliary/pipebuffer/pb_buffer_fenced.c b/src/gallium/auxiliary/pipebuffer/pb_buffer_fenced.c
index 17ff61b675..e4adf8aad7 100644
--- a/src/gallium/auxiliary/pipebuffer/pb_buffer_fenced.c
+++ b/src/gallium/auxiliary/pipebuffer/pb_buffer_fenced.c
@@ -115,7 +115,7 @@ _fenced_buffer_add(struct fenced_buffer *fenced_buf)
 {
    struct fenced_buffer_list *fenced_list = fenced_buf->list;
 
-   assert(fenced_buf->base.base.refcount);
+   assert(fenced_buf->base.base.reference.count);
    assert(fenced_buf->flags & PIPE_BUFFER_USAGE_GPU_READ_WRITE);
    assert(fenced_buf->fence);
 
@@ -137,7 +137,7 @@ _fenced_buffer_destroy(struct fenced_buffer *fenced_buf)
 {
    struct fenced_buffer_list *fenced_list = fenced_buf->list;
    
-   assert(!fenced_buf->base.base.refcount);
+   assert(!fenced_buf->base.base.reference.count);
    assert(!fenced_buf->fence);
 #ifdef DEBUG
    assert(fenced_buf->head.prev);
@@ -177,7 +177,7 @@ _fenced_buffer_remove(struct fenced_buffer_list *fenced_list,
    ++fenced_list->numUnfenced;
 #endif
    
-   if(!fenced_buf->base.base.refcount)
+   if(!fenced_buf->base.base.reference.count)
       _fenced_buffer_destroy(fenced_buf);
 }
 
@@ -253,7 +253,7 @@ fenced_buffer_destroy(struct pb_buffer *buf)
    struct fenced_buffer_list *fenced_list = fenced_buf->list;
 
    pipe_mutex_lock(fenced_list->mutex);
-   assert(fenced_buf->base.base.refcount == 0);
+   assert(fenced_buf->base.base.reference.count == 0);
    if (fenced_buf->fence) {
       struct pb_fence_ops *ops = fenced_list->ops;
       if(ops->fence_signalled(ops, fenced_buf->fence, 0) == 0) {
@@ -461,7 +461,7 @@ fenced_buffer_create(struct fenced_buffer_list *fenced_list,
       return NULL;
    }
    
-   buf->base.base.refcount = 1;
+   pipe_reference_init(&buf->base.base.reference, 1);
    buf->base.base.alignment = buffer->base.alignment;
    buf->base.base.usage = buffer->base.usage;
    buf->base.base.size = buffer->base.size;
@@ -527,7 +527,7 @@ fenced_buffer_list_dump(struct fenced_buffer_list *fenced_list)
    pipe_mutex_lock(fenced_list->mutex);
 
    debug_printf("%10s %7s %10s %s\n",
-                "buffer", "refcount", "fence", "signalled");
+                "buffer", "reference.count", "fence", "signalled");
    
    curr = fenced_list->unfenced.next;
    next = curr->next;
@@ -536,7 +536,7 @@ fenced_buffer_list_dump(struct fenced_buffer_list *fenced_list)
       assert(!fenced_buf->fence);
       debug_printf("%10p %7u\n",
                    fenced_buf,
-                   fenced_buf->base.base.refcount);
+                   fenced_buf->base.base.reference.count);
       curr = next; 
       next = curr->next;
    }
@@ -549,7 +549,7 @@ fenced_buffer_list_dump(struct fenced_buffer_list *fenced_list)
       signaled = ops->fence_signalled(ops, fenced_buf->fence, 0);
       debug_printf("%10p %7u %10p %s\n",
                    fenced_buf,
-                   fenced_buf->base.base.refcount,
+                   fenced_buf->base.base.reference.count,
                    fenced_buf->fence,
                    signaled == 0 ? "y" : "n");
       curr = next;