mesa: add support for memory object creation/import/delete

Used by EXT_external_objects and EXT_external_objects_fd

V2 (Timothy Arceri):
 - Throw GL_OUT_OF_MEMORY error if CreateMemoryObjectsEXT()
   fails.
 - C99 tidy ups
 - remove void cast (Constantine Kharlamov)

V3 (Timothy Arceri):
 - rename mo -> memObj
 - check that the object is not NULL before initializing
 - add missing "EXT" in function error message

V4 (Timothy Arceri):
 - remove checks for (memory objecy id == 0) and catch in
   _mesa_lookup_memory_object() instead.

Signed-off-by: Andres Rodriguez <[email protected]>
Reviewed-by: Samuel Pitoiset <[email protected]>

1 files changed, 36 insertions, 0 deletions

diff --git a/src/mesa/main/dd.h b/src/mesa/main/dd.h
index 462829d755d..6d6bdecb4dd 100644
--- a/src/mesa/main/dd.h
+++ b/src/mesa/main/dd.h
@@ -1069,6 +1069,42 @@ struct dd_function_table {
    void (*MakeImageHandleResident)(struct gl_context *ctx, GLuint64 handle,
                                    GLenum access, bool resident);
    /*@}*/
+
+
+   /**
+    * \name GL_EXT_external_objects interface
+    */
+   /*@{*/
+  /**
+    * Called to allocate a new memory object.  Drivers will usually
+    * allocate/return a subclass of gl_memory_object.
+    */
+   struct gl_memory_object * (*NewMemoryObject)(struct gl_context *ctx,
+                                                GLuint name);
+   /**
+    * Called to delete/free a memory object.  Drivers should free the
+    * object and any image data it contains.
+    */
+   void (*DeleteMemoryObject)(struct gl_context *ctx,
+                              struct gl_memory_object *memObj);
+   /*@}*/
+
+   /**
+    * \name GL_EXT_external_objects_fd interface
+    */
+   /*@{*/
+   /**
+    * Called to import a memory object. The caller relinquishes ownership
+    * of fd after the call returns.
+    *
+    * Accessing fd after ImportMemoryObjectFd returns results in undefined
+    * behaviour. This is consistent with EXT_external_object_fd.
+    */
+   void (*ImportMemoryObjectFd)(struct gl_context *ctx,
+                                struct gl_memory_object *memObj,
+                                GLuint64 size,
+                                int fd);
+   /*@}*/
 };