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, 31 insertions, 59 deletions

diff --git a/src/gallium/drivers/i915simple/i915_prim_vbuf.c b/src/gallium/drivers/i915simple/i915_prim_vbuf.c
index 58c41840e1..9bdd91f288 100644
--- a/src/gallium/drivers/i915simple/i915_prim_vbuf.c
+++ b/src/gallium/drivers/i915simple/i915_prim_vbuf.c
@@ -126,7 +126,7 @@ i915_vbuf_render_allocate_vertices( struct vbuf_render *render,
    } else {
       i915->vbo_flushed = 0;
       if (i915_render->vbo)
-         pipe_buffer_reference(screen, &i915_render->vbo, NULL);
+         pipe_buffer_reference(&i915_render->vbo, NULL);
    }
 
    if (!i915_render->vbo) {
diff --git a/src/gallium/drivers/i915simple/i915_screen.c b/src/gallium/drivers/i915simple/i915_screen.c
index 49471287a2..f4aa8e60d8 100644
--- a/src/gallium/drivers/i915simple/i915_screen.c
+++ b/src/gallium/drivers/i915simple/i915_screen.c
@@ -230,7 +230,6 @@ i915_get_tex_transfer(struct pipe_screen *screen,
 
    trans = CALLOC_STRUCT(i915_transfer);
    if (trans) {
-      trans->base.refcount = 1;
       pipe_texture_reference(&trans->base.texture, texture);
       trans->base.format = trans->base.format;
       trans->base.width = w;
@@ -246,17 +245,10 @@ i915_get_tex_transfer(struct pipe_screen *screen,
 }
 
 static void
-i915_tex_transfer_release(struct pipe_screen *screen,
-                          struct pipe_transfer **transfer)
+i915_tex_transfer_destroy(struct pipe_transfer *trans)
 {
-   struct pipe_transfer *trans = *transfer;
-
-   if (--trans->refcount == 0) {
-      pipe_texture_reference(&trans->texture, NULL);
-      FREE(trans);
-   }
-
-   *transfer = NULL;
+   pipe_texture_reference(&trans->texture, NULL);
+   FREE(trans);
 }
 
 static void *
@@ -344,7 +336,7 @@ i915_create_screen(struct pipe_winsys *winsys, uint pci_id)
    i915screen->screen.get_paramf = i915_get_paramf;
    i915screen->screen.is_format_supported = i915_is_format_supported;
    i915screen->screen.get_tex_transfer = i915_get_tex_transfer;
-   i915screen->screen.tex_transfer_release = i915_tex_transfer_release;
+   i915screen->screen.tex_transfer_destroy = i915_tex_transfer_destroy;
    i915screen->screen.transfer_map = i915_transfer_map;
    i915screen->screen.transfer_unmap = i915_transfer_unmap;
 
diff --git a/src/gallium/drivers/i915simple/i915_texture.c b/src/gallium/drivers/i915simple/i915_texture.c
index 6aead3e75e..39aca9f817 100644
--- a/src/gallium/drivers/i915simple/i915_texture.c
+++ b/src/gallium/drivers/i915simple/i915_texture.c
@@ -582,7 +582,6 @@ i915_texture_create(struct pipe_screen *screen,
                     const struct pipe_texture *templat)
 {
    struct i915_screen *i915screen = i915_screen(screen);
-   struct pipe_winsys *ws = screen->winsys;
    struct i915_texture *tex = CALLOC_STRUCT(i915_texture);
    size_t tex_size;
 
@@ -590,7 +589,7 @@ i915_texture_create(struct pipe_screen *screen,
       return NULL;
 
    tex->base = *templat;
-   tex->base.refcount = 1;
+   pipe_reference_init(&tex->base.reference, 1);
    tex->base.screen = screen;
 
    tex->base.nblocksx[0] = pf_get_nblocksx(&tex->base.block, tex->base.width[0]);
@@ -606,7 +605,7 @@ i915_texture_create(struct pipe_screen *screen,
 
    tex_size = tex->stride * tex->total_nblocksy;
 
-   tex->buffer = ws->buffer_create(ws, 64,
+   tex->buffer = screen->buffer_create(screen, 64,
                                     PIPE_BUFFER_USAGE_PIXEL,
                                     tex_size);
 
@@ -629,33 +628,22 @@ fail:
 
 
 static void
-i915_texture_release(struct pipe_screen *screen,
-                     struct pipe_texture **pt)
+i915_texture_destroy(struct pipe_texture *pt)
 {
-   if (!*pt)
-      return;
+   struct i915_texture *tex = (struct i915_texture *)pt;
+   uint i;
 
    /*
-   DBG("%s %p refcount will be %d\n",
-       __FUNCTION__, (void *) *pt, (*pt)->refcount - 1);
+     DBG("%s deleting %p\n", __FUNCTION__, (void *) tex);
    */
-   if (--(*pt)->refcount <= 0) {
-      struct i915_texture *tex = (struct i915_texture *)*pt;
-      uint i;
-
-      /*
-      DBG("%s deleting %p\n", __FUNCTION__, (void *) tex);
-      */
 
-      pipe_buffer_reference(screen, &tex->buffer, NULL);
+   pipe_buffer_reference(&tex->buffer, NULL);
 
-      for (i = 0; i < PIPE_MAX_TEXTURE_LEVELS; i++)
-         if (tex->image_offset[i])
-            FREE(tex->image_offset[i]);
+   for (i = 0; i < PIPE_MAX_TEXTURE_LEVELS; i++)
+      if (tex->image_offset[i])
+         FREE(tex->image_offset[i]);
 
-      FREE(tex);
-   }
-   *pt = NULL;
+   FREE(tex);
 }
 
 static struct pipe_surface *
@@ -682,7 +670,7 @@ i915_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];
@@ -715,7 +703,7 @@ i915_texture_blanket(struct pipe_screen * screen,
       return NULL;
 
    tex->base = *base;
-   tex->base.refcount = 1;
+   pipe_reference_init(&tex->base.reference, 1);
    tex->base.screen = screen;
 
    tex->stride = stride[0];
@@ -723,7 +711,7 @@ i915_texture_blanket(struct pipe_screen * screen,
    i915_miptree_set_level_info(tex, 0, 1, base->width[0], base->height[0], 1);
    i915_miptree_set_image_offset(tex, 0, 0, 0, 0);
 
-   pipe_buffer_reference(screen, &tex->buffer, buffer);
+   pipe_buffer_reference(&tex->buffer, buffer);
 
    return &tex->base;
 }
@@ -735,36 +723,28 @@ i915_init_texture_functions(struct i915_context *i915)
 }
 
 static void
-i915_tex_surface_release(struct pipe_screen *screen,
-                         struct pipe_surface **surface)
+i915_tex_surface_destroy(struct pipe_surface *surf)
 {
-   struct pipe_surface *surf = *surface;
-
-   if (--surf->refcount == 0) {
-
-      /* This really should not be possible, but it's actually
-       * happening quite a bit...  Will fix.
-       */
-      if (surf->status == PIPE_SURFACE_STATUS_CLEAR) {
-         debug_printf("XXX destroying a surface with pending clears...\n");
-         assert(0);
-      }
-
-      pipe_texture_reference(&surf->texture, NULL);
-      FREE(surf);
+   /* This really should not be possible, but it's actually
+    * happening quite a bit...  Will fix.
+    */
+   if (surf->status == PIPE_SURFACE_STATUS_CLEAR) {
+      debug_printf("XXX destroying a surface with pending clears...\n");
+      assert(0);
    }
 
-   *surface = NULL;
+   pipe_texture_reference(&surf->texture, NULL);
+   FREE(surf);
 }
 
 void
 i915_init_screen_texture_functions(struct pipe_screen *screen)
 {
    screen->texture_create = i915_texture_create;
-   screen->texture_release = i915_texture_release;
+   screen->texture_destroy = i915_texture_destroy;
    screen->get_tex_surface = i915_get_tex_surface;
    screen->texture_blanket = i915_texture_blanket;
-   screen->tex_surface_release = i915_tex_surface_release;
+   screen->tex_surface_destroy = i915_tex_surface_destroy;
 }
 
 boolean i915_get_texture_buffer( struct pipe_texture *texture,
@@ -776,7 +756,7 @@ boolean i915_get_texture_buffer( struct pipe_texture *texture,
    if (!tex)
       return FALSE;
 
-   pipe_buffer_reference(texture->screen, buf, tex->buffer);
+   pipe_buffer_reference(buf, tex->buffer);
 
    if (stride)
       *stride = tex->stride;