gallium: introduce memory object

v2: fix comment regarding fd ownership, define pipe_memory_object
v3: remove stray return
v4 (Timothy Arceri): update trace
v5 (Timothy Arceri): actually dump the params in trace

Reviewed-by: Marek Olšák <[email protected]> (v3)
Reviewed-by: Samuel Pitoiset <[email protected]>

2 files changed, 44 insertions, 0 deletions

diff --git a/src/gallium/include/pipe/p_screen.h b/src/gallium/include/pipe/p_screen.h
index b6623d1dd71..462b683cd75 100644
--- a/src/gallium/include/pipe/p_screen.h
+++ b/src/gallium/include/pipe/p_screen.h
@@ -358,6 +358,42 @@ struct pipe_screen {
                                   enum pipe_format format, int max,
                                   uint64_t *modifiers,
                                   unsigned int *external_only, int *count);
+
+   /**
+    * Create a memory object from a winsys handle
+    *
+    * The underlying memory is most often allocated in by a foregin API.
+    * Then the underlying memory object is then exported through interfaces
+    * compatible with EXT_external_resources.
+    *
+    * Note: For DRM_API_HANDLE_TYPE_FD handles, the caller retains ownership
+    * of the fd.
+    *
+    * \param handle  A handle representing the memory object to import
+    */
+   struct pipe_memory_object *(*memobj_create_from_handle)(struct pipe_screen *screen,
+                                                           struct winsys_handle *handle,
+                                                           bool dedicated);
+
+   /**
+    * Destroy a memory object
+    *
+    * \param memobj  The memory object to destroy
+    */
+   void (*memobj_destroy)(struct pipe_screen *screen,
+                          struct pipe_memory_object *memobj);
+
+   /**
+    * Create a texture from a memory object
+    *
+    * \param t       texture template
+    * \param memobj  The memory object used to back the texture
+    */
+   struct pipe_resource * (*resource_from_memobj)(struct pipe_screen *screen,
+                                                  const struct pipe_resource *t,
+                                                  struct pipe_memory_object *memobj,
+                                                  uint64_t offset);
+
 };
 
 
diff --git a/src/gallium/include/pipe/p_state.h b/src/gallium/include/pipe/p_state.h
index 15be8cb5d02..86c7751eb18 100644
--- a/src/gallium/include/pipe/p_state.h
+++ b/src/gallium/include/pipe/p_state.h
@@ -888,6 +888,14 @@ struct pipe_memory_info
    unsigned nr_device_memory_evictions; /**< # of evictions (monotonic counter) */
 };
 
+/**
+ * Structure that contains information about external memory
+ */
+struct pipe_memory_object
+{
+   bool dedicated;
+};
+
 #ifdef __cplusplus
 }
 #endif