1 files changed, 112 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_surfaces.c b/src/gallium/auxiliary/util/u_surfaces.c
new file mode 100644
index 00000000000..3a0539ceb47
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_surfaces.c
@@ -0,0 +1,112 @@
+#include "u_surfaces.h"
+#include "util/u_hash_table.h"
+#include "util/u_inlines.h"
+#include "util/u_memory.h"
+
+/* TODO: ouch, util_hash_table should do these by default when passed a null function pointer
+ * this indirect function call is quite bad
+ */
+static unsigned
+hash(void *key)
+{
+   return (unsigned)key;
+}
+
+static int
+compare(void *key1, void *key2)
+{
+   return (unsigned)key1 - (unsigned)key2;
+}
+
+struct pipe_surface *
+util_surfaces_do_get(struct util_surfaces *us, unsigned surface_struct_size, struct pipe_screen *pscreen, struct pipe_resource *pt, unsigned face, unsigned level, unsigned zslice, unsigned flags)
+{
+   struct pipe_surface *ps;
+   void *key;
+
+   if(pt->target == PIPE_TEXTURE_3D || pt->target == PIPE_TEXTURE_CUBE)
+   {	/* or 2D array */
+      if(!us->u.table)
+	 us->u.table = util_hash_table_create(hash, compare);
+      key = (void *)(((zslice + face) << 8) | level);
+      /* TODO: ouch, should have a get-reference function...
+       * also, shouldn't allocate a two-pointer structure for each item... */
+      ps = util_hash_table_get(us->u.table, key);
+   }
+   else
+   {
+      if(!us->u.array)
+	 us->u.array = CALLOC(pt->last_level + 1, sizeof(struct pipe_surface *));
+      ps = us->u.array[level];
+   }
+
+   if(ps)
+   {
+      p_atomic_inc(&ps->reference.count);
+      return ps;
+   }
+
+   ps = (struct pipe_surface *)CALLOC(1, surface_struct_size);
+   if(!ps)
+      return NULL;
+
+   pipe_reference_init(&ps->reference, 1);
+   pipe_surface_init(ps, pt, face, level, zslice, flags);
+   ps->offset = ~0;
+
+   if(pt->target == PIPE_TEXTURE_3D || pt->target == PIPE_TEXTURE_CUBE)
+      util_hash_table_set(us->u.table, key, ps);
+   else
+      us->u.array[level] = ps;
+
+   return ps;
+}
+
+void
+util_surfaces_do_detach(struct util_surfaces *us, struct pipe_surface *ps)
+{
+   struct pipe_resource *pt = ps->texture;
+   if(pt->target == PIPE_TEXTURE_3D || pt->target == PIPE_TEXTURE_CUBE)
+   {	/* or 2D array */
+      unsigned key = ((ps->zslice + ps->face) << 8) | ps->level;
+      util_hash_table_remove(us->u.table, key);
+   }
+   else
+      us->u.array[ps->level] = 0;
+}
+
+static enum pipe_error
+util_surfaces_destroy_callback(void *key, void *value, void *data)
+{
+   void (*destroy_surface) (struct pipe_surface * ps) = data;
+   destroy_surface((struct pipe_surface *)value);
+   return PIPE_OK;
+}
+
+void
+util_surfaces_destroy(struct util_surfaces *us, struct pipe_resource *pt, void (*destroy_surface) (struct pipe_surface *))
+{
+   if(pt->target == PIPE_TEXTURE_3D || pt->target == PIPE_TEXTURE_CUBE)
+   {	/* or 2D array */
+      if(us->u.table)
+      {
+	 util_hash_table_foreach(us->u.table, util_surfaces_destroy_callback, destroy_surface);
+	 util_hash_table_destroy(us->u.table);
+	 us->u.table = NULL;
+      }
+   }
+   else
+   {
+      if(us->u.array)
+      {
+	 for(unsigned i = 0; i < pt->last_level; ++i)
+	 {
+	    struct pipe_surface *ps = us->u.array[i];
+	    if(ps)
+	       destroy_surface(ps);
+	 }
+	 free(us->u.array);
+	 us->u.array = NULL;
+      }
+   }
+}