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, 16 insertions, 30 deletions

diff --git a/src/gallium/drivers/nv20/nv20_miptree.c b/src/gallium/drivers/nv20/nv20_miptree.c
index 29462408970..b2f29aff8d2 100644
--- a/src/gallium/drivers/nv20/nv20_miptree.c
+++ b/src/gallium/drivers/nv20/nv20_miptree.c
@@ -76,19 +76,18 @@ nv20_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 *
 nv20_miptree_create(struct pipe_screen *screen, const struct pipe_texture *pt)
 {
-	struct pipe_winsys *ws = screen->winsys;
 	struct nv20_miptree *mt;
 	unsigned buf_usage = PIPE_BUFFER_USAGE_PIXEL |
 	                     NOUVEAU_BUFFER_USAGE_TEXTURE;
@@ -97,7 +96,7 @@ nv20_miptree_create(struct pipe_screen *screen, 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 = screen;
 
 	/* Swizzled textures must be POT */
@@ -133,7 +132,7 @@ nv20_miptree_create(struct pipe_screen *screen, const struct pipe_texture *pt)
 
 	nv20_miptree_layout(mt);
 
-	mt->buffer = ws->buffer_create(ws, 256, buf_usage, mt->total_size);
+	mt->buffer = screen->buffer_create(screen, 256, buf_usage, mt->total_size);
 	if (!mt->buffer) {
 		FREE(mt);
 		return NULL;
@@ -143,22 +142,16 @@ nv20_miptree_create(struct pipe_screen *screen, const struct pipe_texture *pt)
 }
 
 static void
-nv20_miptree_release(struct pipe_screen *screen, struct pipe_texture **pt)
+nv20_miptree_destroy(struct pipe_texture *pt)
 {
-	struct pipe_texture *mt = *pt;
-
-	*pt = NULL;
-	if (--mt->refcount <= 0) {
-		struct nv20_miptree *nv20mt = (struct nv20_miptree *)mt;
-		int l;
+	struct nv20_miptree *nv20mt = (struct nv20_miptree *)pt;
+        int l;
 
-		pipe_buffer_reference(screen, &nv20mt->buffer, NULL);
-		for (l = 0; l <= mt->last_level; l++) {
-			if (nv20mt->level[l].image_offset)
-				FREE(nv20mt->level[l].image_offset);
-		}
-		FREE(nv20mt);
-	}
+        pipe_buffer_reference(&nv20mt->buffer, NULL);
+        for (l = 0; l <= pt->last_level; l++) {
+		if (nv20mt->level[l].image_offset)
+			FREE(nv20mt->level[l].image_offset);
+        }
 }
 
 static struct pipe_surface *
@@ -178,7 +171,7 @@ nv20_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;
@@ -197,15 +190,8 @@ nv20_miptree_surface_get(struct pipe_screen *screen, struct pipe_texture *pt,
 }
 
 static void
-nv20_miptree_surface_release(struct pipe_screen *pscreen,
-			     struct pipe_surface **psurface)
+nv20_miptree_surface_destroy(struct pipe_surface *ps)
 {
-	struct pipe_surface *ps = *psurface;
-
-	*psurface = NULL;
-	if (--ps->refcount > 0)
-		return;
-
 	pipe_texture_reference(&ps->texture, NULL);
 	FREE(ps);
 }
@@ -214,8 +200,8 @@ void nv20_screen_init_miptree_functions(struct pipe_screen *pscreen)
 {
 	pscreen->texture_create = nv20_miptree_create;
 	pscreen->texture_blanket = nv20_miptree_blanket;
-	pscreen->texture_release = nv20_miptree_release;
+	pscreen->texture_destroy = nv20_miptree_destroy;
 	pscreen->get_tex_surface = nv20_miptree_surface_get;
-	pscreen->tex_surface_release = nv20_miptree_surface_release;
+	pscreen->tex_surface_destroy = nv20_miptree_surface_destroy;
 }