auxiliary: add util_surfaces to track a resource's pipe_surface structs

[mesa.git] / src / gallium / auxiliary / util / u_surfaces.h

diff --git a/src/gallium/auxiliary/util/u_surfaces.h b/src/gallium/auxiliary/util/u_surfaces.h
new file mode 100644 (file)
index 0000000..6de5e7c
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_surfaces.h
@@ -0,0 +1,54 @@
+#ifndef U_SURFACES_H_
+#define U_SURFACES_H_
+
+#include "pipe/p_compiler.h"
+#include "pipe/p_state.h"
+#include "util/u_atomic.h"
+
+struct util_hash_table;
+
+struct util_surfaces
+{
+   union
+   {
+      struct util_hash_table *table;
+      struct pipe_surface **array;
+   } u;
+};
+
+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);
+
+/* fast inline path for the very common case */
+static INLINE struct pipe_surface *
+util_surfaces_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)
+{
+   if(likely(pt->target == PIPE_TEXTURE_2D && us->u.array))
+   {
+      struct pipe_surface *ps = us->u.array[level];
+      if(ps)
+      {
+        p_atomic_inc(&ps->reference.count);
+        return ps;
+      }
+   }
+
+   return util_surfaces_do_get(us, surface_struct_size, pscreen, pt, face, level, zslice, flags);
+}
+
+void util_surfaces_do_detach(struct util_surfaces *us, struct pipe_surface *ps);
+
+static INLINE void
+util_surfaces_detach(struct util_surfaces *us, struct pipe_surface *ps)
+{
+   if(likely(ps->texture->target == PIPE_TEXTURE_2D))
+   {
+      us->u.array[ps->level] = 0;
+      return;
+   }
+
+   return util_surfaces_do_detach(us, ps);
+}
+
+void util_surfaces_destroy(struct util_surfaces *us, struct pipe_resource *pt, void (*destroy_surface) (struct pipe_surface *));
+
+#endif