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().

3 files changed, 24 insertions, 36 deletions

diff --git a/src/gallium/drivers/nv10/nv10_miptree.c b/src/gallium/drivers/nv10/nv10_miptree.c
index 4747868a50..bb3a1c0f19 100644
--- a/src/gallium/drivers/nv10/nv10_miptree.c
+++ b/src/gallium/drivers/nv10/nv10_miptree.c
@@ -66,31 +66,30 @@ nv10_miptree_blanket(struct pipe_screen *pscreen, const struct pipe_texture *pt,
 		return NULL;
 
 	mt->base = *pt;
-	mt->base.refcount = 1;
+	pipe_reference_init(&mt->base.reference, 1);
 	mt->base.screen = pscreen;
 	mt->level[0].pitch = stride[0];
 	mt->level[0].image_offset = CALLOC(1, sizeof(unsigned));
 
-	pipe_buffer_reference(pscreen, &mt->buffer, pb);
+	pipe_buffer_reference(&mt->buffer, pb);
 	return &mt->base;
 }
 
 static struct pipe_texture *
 nv10_miptree_create(struct pipe_screen *screen, const struct pipe_texture *pt)
 {
-	struct pipe_winsys *ws = screen->winsys;
 	struct nv10_miptree *mt;
 
 	mt = MALLOC(sizeof(struct nv10_miptree));
 	if (!mt)
 		return NULL;
 	mt->base = *pt;
-	mt->base.refcount = 1;
+	pipe_reference_init(&mt->base.reference, 1);
 	mt->base.screen = screen;
 
 	nv10_miptree_layout(mt);
 
-	mt->buffer = ws->buffer_create(ws, 256, PIPE_BUFFER_USAGE_PIXEL,
+	mt->buffer = screen->buffer_create(screen, 256, PIPE_BUFFER_USAGE_PIXEL,
 					   mt->total_size);
 	if (!mt->buffer) {
 		FREE(mt);
@@ -101,22 +100,17 @@ nv10_miptree_create(struct pipe_screen *screen, const struct pipe_texture *pt)
 }
 
 static void
-nv10_miptree_release(struct pipe_screen *screen, struct pipe_texture **pt)
+nv10_miptree_destroy(struct pipe_texture *pt)
 {
-	struct pipe_texture *mt = *pt;
-
-	*pt = NULL;
-	if (--mt->refcount <= 0) {
-		struct nv10_miptree *nv10mt = (struct nv10_miptree *)mt;
-		int l;
-
-		pipe_buffer_reference(screen, &nv10mt->buffer, NULL);
-		for (l = 0; l <= mt->last_level; l++) {
-			if (nv10mt->level[l].image_offset)
-				FREE(nv10mt->level[l].image_offset);
-		}
-		FREE(nv10mt);
-	}
+	struct nv10_miptree *nv10mt = (struct nv10_miptree *)pt;
+        int l;
+
+        pipe_buffer_reference(&nv10mt->buffer, NULL);
+        for (l = 0; l <= pt->last_level; l++) {
+		if (nv10mt->level[l].image_offset)
+			FREE(nv10mt->level[l].image_offset);
+        }
+        FREE(nv10mt);
 }
 
 static void
@@ -143,7 +137,7 @@ nv10_miptree_surface_get(struct pipe_screen *screen, struct pipe_texture *pt,
 	ns->base.height = pt->height[level];
 	ns->base.usage = flags;
 	ns->base.status = PIPE_SURFACE_STATUS_DEFINED;
-	ns->base.refcount = 1;
+	pipe_reference_init(&ns->base.reference, 1);
 	ns->base.face = face;
 	ns->base.level = level;
 	ns->base.zslice = zslice;
@@ -159,8 +153,7 @@ nv10_miptree_surface_get(struct pipe_screen *screen, struct pipe_texture *pt,
 }
 
 static void
-nv10_miptree_surface_release(struct pipe_screen *screen,
-			     struct pipe_surface **surface)
+nv10_miptree_surface_destroy(struct pipe_surface *surface)
 {
 }
 
@@ -168,8 +161,8 @@ void nv10_screen_init_miptree_functions(struct pipe_screen *pscreen)
 {
 	pscreen->texture_create = nv10_miptree_create;
 	pscreen->texture_blanket = nv10_miptree_blanket;
-	pscreen->texture_release = nv10_miptree_release;
+	pscreen->texture_destroy = nv10_miptree_destroy;
 	pscreen->get_tex_surface = nv10_miptree_surface_get;
-	pscreen->tex_surface_release = nv10_miptree_surface_release;
+	pscreen->tex_surface_destroy = nv10_miptree_surface_destroy;
 }
 
diff --git a/src/gallium/drivers/nv10/nv10_prim_vbuf.c b/src/gallium/drivers/nv10/nv10_prim_vbuf.c
index 491a881806..089c236302 100644
--- a/src/gallium/drivers/nv10/nv10_prim_vbuf.c
+++ b/src/gallium/drivers/nv10/nv10_prim_vbuf.c
@@ -106,11 +106,11 @@ nv10_vbuf_render_allocate_vertices( struct vbuf_render *render,
 {
 	struct nv10_vbuf_render *nv10_render = nv10_vbuf_render(render);
 	struct nv10_context *nv10 = nv10_render->nv10;
-	struct pipe_winsys *winsys = nv10->pipe.winsys;
+	struct pipe_screen *screen = nv10->pipe.screen;
 	size_t size = (size_t)vertex_size * (size_t)nr_vertices;
 
 	assert(!nv10_render->buffer);
-	nv10_render->buffer = winsys->buffer_create(winsys, 64, PIPE_BUFFER_USAGE_VERTEX, size);
+	nv10_render->buffer = screen->buffer_create(screen, 64, PIPE_BUFFER_USAGE_VERTEX, size);
 
 	nv10->dirty |= NV10_NEW_VTXARRAYS;
 
@@ -206,7 +206,7 @@ nv10_vbuf_render_release_vertices( struct vbuf_render *render )
 	struct pipe_screen *pscreen = &nv10->screen->pipe;
 
 	assert(nv10_render->buffer);
-	pipe_buffer_reference(pscreen, &nv10_render->buffer, NULL);
+	pipe_buffer_reference(&nv10_render->buffer, NULL);
 }
 
 
diff --git a/src/gallium/drivers/nv10/nv10_transfer.c b/src/gallium/drivers/nv10/nv10_transfer.c
index daec37ab28..5a99225409 100644
--- a/src/gallium/drivers/nv10/nv10_transfer.c
+++ b/src/gallium/drivers/nv10/nv10_transfer.c
@@ -64,7 +64,6 @@ nv10_transfer_new(struct pipe_screen *pscreen, struct pipe_texture *pt,
 	if (!tx)
 		return NULL;
 
-	tx->base.refcount = 1;
 	pipe_texture_reference(&tx->base.texture, pt);
 	tx->base.format = pt->format;
 	tx->base.x = x;
@@ -138,12 +137,12 @@ nv10_transfer_new(struct pipe_screen *pscreen, struct pipe_texture *pt,
 }
 
 static void
-nv10_transfer_del(struct pipe_screen *pscreen, struct pipe_transfer **pptx)
+nv10_transfer_del(struct pipe_transfer *ptx)
 {
-	struct pipe_transfer *ptx = *pptx;
 	struct nv10_transfer *tx = (struct nv10_transfer *)ptx;
 
 	if (!tx->direct && ptx->usage != PIPE_TRANSFER_READ) {
+		struct pipe_screen *pscreen = ptx->texture->screen;
 		struct nv10_screen *nvscreen = nv10_screen(pscreen);
 		struct pipe_surface *dst;
 
@@ -160,10 +159,6 @@ nv10_transfer_del(struct pipe_screen *pscreen, struct pipe_transfer **pptx)
 		pipe_surface_reference(&dst, NULL);
 	}
 
-	*pptx = NULL;
-	if (--ptx->refcount)
-		return;
-
 	pipe_surface_reference(&tx->surface, NULL);
 	pipe_texture_reference(&ptx->texture, NULL);
 	FREE(ptx);
@@ -195,7 +190,7 @@ void
 nv10_screen_init_transfer_functions(struct pipe_screen *pscreen)
 {
 	pscreen->get_tex_transfer = nv10_transfer_new;
-	pscreen->tex_transfer_release = nv10_transfer_del;
+	pscreen->tex_transfer_destroy = nv10_transfer_del;
 	pscreen->transfer_map = nv10_transfer_map;
 	pscreen->transfer_unmap = nv10_transfer_unmap;
 }