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, 10 insertions, 23 deletions

diff --git a/src/gallium/drivers/nv30/nv30_miptree.c b/src/gallium/drivers/nv30/nv30_miptree.c
index ec0a8b8438c..d6dc621c9ee 100644
--- a/src/gallium/drivers/nv30/nv30_miptree.c
+++ b/src/gallium/drivers/nv30/nv30_miptree.c
@@ -67,7 +67,6 @@ nv30_miptree_layout(struct nv30_miptree *nv30mt)
 static struct pipe_texture *
 nv30_miptree_create(struct pipe_screen *pscreen, const struct pipe_texture *pt)
 {
-	struct pipe_winsys *ws = pscreen->winsys;
 	struct nv30_miptree *mt;
 	unsigned buf_usage = PIPE_BUFFER_USAGE_PIXEL |
 	                     NOUVEAU_BUFFER_USAGE_TEXTURE;
@@ -76,7 +75,7 @@ nv30_miptree_create(struct pipe_screen *pscreen, const struct pipe_texture *pt)
 	if (!mt)
 		return NULL;
 	mt->base = *pt;
-	mt->base.refcount = 1;
+	pipe_reference_init(&mt->base.reference, 1);
 	mt->base.screen = pscreen;
 
 	/* Swizzled textures must be POT */
@@ -112,7 +111,7 @@ nv30_miptree_create(struct pipe_screen *pscreen, const struct pipe_texture *pt)
 
 	nv30_miptree_layout(mt);
 
-	mt->buffer = ws->buffer_create(ws, 256, buf_usage,
+	mt->buffer = pscreen->buffer_create(pscreen, 256, buf_usage,
 				       mt->total_size);
 	if (!mt->buffer) {
 		FREE(mt);
@@ -138,27 +137,22 @@ nv30_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 void
-nv30_miptree_release(struct pipe_screen *pscreen, struct pipe_texture **ppt)
+nv30_miptree_destroy(struct pipe_texture *pt)
 {
-	struct pipe_texture *pt = *ppt;
 	struct nv30_miptree *mt = (struct nv30_miptree *)pt;
 	int l;
 
-	*ppt = NULL;
-	if (--pt->refcount)
-		return;
-
-	pipe_buffer_reference(pscreen, &mt->buffer, NULL);
+	pipe_buffer_reference(&mt->buffer, NULL);
 	for (l = 0; l <= pt->last_level; l++) {
 		if (mt->level[l].image_offset)
 			FREE(mt->level[l].image_offset);
@@ -184,7 +178,7 @@ nv30_miptree_surface_new(struct pipe_screen *pscreen, 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;
@@ -203,15 +197,8 @@ nv30_miptree_surface_new(struct pipe_screen *pscreen, struct pipe_texture *pt,
 }
 
 static void
-nv30_miptree_surface_del(struct pipe_screen *pscreen,
-			 struct pipe_surface **psurface)
+nv30_miptree_surface_del(struct pipe_surface *ps)
 {
-	struct pipe_surface *ps = *psurface;
-
-	*psurface = NULL;
-	if (--ps->refcount > 0)
-		return;
-
 	pipe_texture_reference(&ps->texture, NULL);
 	FREE(ps);
 }
@@ -221,7 +208,7 @@ nv30_screen_init_miptree_functions(struct pipe_screen *pscreen)
 {
 	pscreen->texture_create = nv30_miptree_create;
 	pscreen->texture_blanket = nv30_miptree_blanket;
-	pscreen->texture_release = nv30_miptree_release;
+	pscreen->texture_destroy = nv30_miptree_destroy;
 	pscreen->get_tex_surface = nv30_miptree_surface_new;
-	pscreen->tex_surface_release = nv30_miptree_surface_del;
+	pscreen->tex_surface_destroy = nv30_miptree_surface_del;
 }