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, 22 insertions, 43 deletions

diff --git a/src/gallium/drivers/cell/ppu/cell_texture.c b/src/gallium/drivers/cell/ppu/cell_texture.c
index 74724393f78..bc6afa94a8b 100644
--- a/src/gallium/drivers/cell/ppu/cell_texture.c
+++ b/src/gallium/drivers/cell/ppu/cell_texture.c
@@ -101,18 +101,17 @@ static struct pipe_texture *
 cell_texture_create(struct pipe_screen *screen,
                     const struct pipe_texture *templat)
 {
-   struct pipe_winsys *ws = screen->winsys;
    struct cell_texture *ct = CALLOC_STRUCT(cell_texture);
    if (!ct)
       return NULL;
 
    ct->base = *templat;
-   ct->base.refcount = 1;
+   pipe_reference_init(&ct->base.reference, 1);
    ct->base.screen = screen;
 
    cell_texture_layout(ct);
 
-   ct->buffer = ws->buffer_create(ws, 32, PIPE_BUFFER_USAGE_PIXEL,
+   ct->buffer = screen->buffer_create(screen, 32, PIPE_BUFFER_USAGE_PIXEL,
                                    ct->buffer_size);
 
    if (!ct->buffer) {
@@ -125,28 +124,18 @@ cell_texture_create(struct pipe_screen *screen,
 
 
 static void
-cell_texture_release(struct pipe_screen *screen,
-                     struct pipe_texture **pt)
+cell_texture_destroy(struct pipe_texture *pt)
 {
-   if (!*pt)
-      return;
-
-   if (--(*pt)->refcount <= 0) {
-      /* Delete this texture now.
-       * But note that the underlying pipe_buffer may linger...
-       */
-      struct cell_texture *ct = cell_texture(*pt);
+   struct cell_texture *ct = cell_texture(pt);
 
-      if (ct->mapped) {
-         pipe_buffer_unmap(screen, ct->buffer);
-         ct->mapped = NULL;
-      }
+   if (ct->mapped) {
+      pipe_buffer_unmap(screen, ct->buffer);
+      ct->mapped = NULL;
+   }
 
-      pipe_buffer_reference(screen, &ct->buffer, NULL);
+   pipe_buffer_reference(&ct->buffer, NULL);
 
-      FREE(ct);
-   }
-   *pt = NULL;
+   FREE(ct);
 }
 
 
@@ -291,7 +280,7 @@ cell_get_tex_surface(struct pipe_screen *screen,
 
    ps = CALLOC_STRUCT(pipe_surface);
    if (ps) {
-      ps->refcount = 1;
+      pipe_reference_init(&ps->reference, 1);
       pipe_texture_reference(&ps->texture, pt);
       ps->format = pt->format;
       ps->width = pt->width[level];
@@ -319,16 +308,10 @@ cell_get_tex_surface(struct pipe_screen *screen,
 
 
 static void 
-cell_tex_surface_release(struct pipe_screen *screen, 
-                         struct pipe_surface **s)
+cell_tex_surface_destroy(struct pipe_surface *s)
 {
-   struct pipe_surface *surf = *s;
-
-   if (--surf->refcount == 0) {
-      pipe_texture_reference(&surf->texture, NULL);
-      FREE(surf);
-   }
-   *s = NULL;
+   pipe_texture_reference(&surf->texture, NULL);
+   FREE(surf);
 }
 
 
@@ -353,7 +336,7 @@ cell_get_tex_transfer(struct pipe_screen *screen,
    ctrans = CALLOC_STRUCT(cell_transfer);
    if (ctrans) {
       struct pipe_transfer *pt = &ctrans->base;
-      pt->refcount = 1;
+      pipe_reference_init(&pt->reference, 1);
       pipe_texture_reference(&pt->texture, texture);
       pt->format = texture->format;
       pt->block = texture->block;
@@ -388,20 +371,16 @@ cell_get_tex_transfer(struct pipe_screen *screen,
 
 
 static void 
-cell_tex_transfer_release(struct pipe_screen *screen, 
-                          struct pipe_transfer **t)
+cell_tex_transfer_destroy(struct pipe_transfer *t)
 {
-   struct cell_transfer *transfer = cell_transfer(*t);
+   struct cell_transfer *transfer = cell_transfer(t);
    /* Effectively do the texture_update work here - if texture images
     * needed post-processing to put them into hardware layout, this is
     * where it would happen.  For cell, nothing to do.
     */
    assert (transfer->base.texture);
-   if (--transfer->base.refcount == 0) {
-      pipe_texture_reference(&transfer->base.texture, NULL);
-      FREE(transfer);
-   }
-   *t = NULL;
+   pipe_texture_reference(&transfer->base.texture, NULL);
+   FREE(transfer);
 }
 
 
@@ -511,13 +490,13 @@ void
 cell_init_screen_texture_funcs(struct pipe_screen *screen)
 {
    screen->texture_create = cell_texture_create;
-   screen->texture_release = cell_texture_release;
+   screen->texture_destroy = cell_texture_destroy;
 
    screen->get_tex_surface = cell_get_tex_surface;
-   screen->tex_surface_release = cell_tex_surface_release;
+   screen->tex_surface_destroy = cell_tex_surface_destroy;
 
    screen->get_tex_transfer = cell_get_tex_transfer;
-   screen->tex_transfer_release = cell_tex_transfer_release;
+   screen->tex_transfer_destroy = cell_tex_transfer_destroy;
 
    screen->transfer_map = cell_transfer_map;
    screen->transfer_unmap = cell_transfer_unmap;