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The virtual function gets called in cogl_object_unref. Any definition of a CoglObject type can replace the default unref function by using COGL_OBJECT_DEFINE_WITH_CODE to directly manipulate the CoglObjectClass struct. The generated object constructors set the pointer to the default implementation. The default implementation is exported in the private header so that any overriding implementations can chain up to it. Reviewed-by: Robert Bragg <robert@linux.intel.com>
298 lines
15 KiB
C
298 lines
15 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2008,2009,2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Authors:
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* Robert Bragg <robert@linux.intel.com>
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*/
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#ifndef __COGL_OBJECT_PRIVATE_H
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#define __COGL_OBJECT_PRIVATE_H
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#include <glib.h>
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#include "cogl-types.h"
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#include "cogl-object.h"
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#include "cogl-debug.h"
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/* For compatability until all components have been converted */
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typedef struct _CoglObjectClass CoglHandleClass;
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typedef struct _CoglObject CoglHandleObject;
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/* XXX: sadly we didn't fully consider when we copied the cairo API
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* for _set_user_data that the callback doesn't get a pointer to the
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* instance which is desired in most cases. This means you tend to end
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* up creating micro allocations for the private data just so you can
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* pair up the data of interest with the original instance for
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* identification when it is later destroyed.
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*
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* Internally we use a small hack to avoid needing these micro
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* allocations by actually passing the instance as a second argument
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* to the callback */
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typedef void (*CoglUserDataDestroyInternalCallback) (void *user_data,
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void *instance);
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typedef struct _CoglObjectClass
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{
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const char *name;
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void *virt_free;
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void *virt_unref;
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} CoglObjectClass;
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#define COGL_OBJECT_N_PRE_ALLOCATED_USER_DATA_ENTRIES 2
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typedef struct
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{
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CoglUserDataKey *key;
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void *user_data;
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CoglUserDataDestroyInternalCallback destroy;
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} CoglUserDataEntry;
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/* All Cogl objects inherit from this base object by adding a member:
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*
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* CoglObject _parent;
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*
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* at the top of its main structure. This structure is initialized
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* when you call _cogl_#type_name#_object_new (new_object);
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*/
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struct _CoglObject
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{
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CoglObjectClass *klass;
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CoglUserDataEntry user_data_entry[
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COGL_OBJECT_N_PRE_ALLOCATED_USER_DATA_ENTRIES];
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GArray *user_data_array;
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int n_user_data_entries;
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unsigned int ref_count;
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};
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/* Helper macro to encapsulate the common code for COGL reference
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counted objects */
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#ifdef COGL_OBJECT_DEBUG
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#define _COGL_OBJECT_DEBUG_NEW(type_name, obj) \
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COGL_NOTE (HANDLE, "COGL " G_STRINGIFY (type_name) " NEW %p %i", \
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(obj), (obj)->ref_count)
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#define _COGL_OBJECT_DEBUG_REF(type_name, object) G_STMT_START { \
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CoglObject *__obj = (CoglObject *)object; \
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COGL_NOTE (HANDLE, "COGL %s REF %p %i", \
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(__obj)->klass->name, \
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(__obj), (__obj)->ref_count); } G_STMT_END
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#define _COGL_OBJECT_DEBUG_UNREF(type_name, object) G_STMT_START { \
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CoglObject *__obj = (CoglObject *)object; \
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COGL_NOTE (HANDLE, "COGL %s UNREF %p %i", \
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(__obj)->klass->name, \
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(__obj), (__obj)->ref_count - 1); } G_STMT_END
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#define COGL_OBJECT_DEBUG_FREE(obj) \
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COGL_NOTE (HANDLE, "COGL %s FREE %p", \
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(obj)->klass->name, (obj))
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#else /* !COGL_OBJECT_DEBUG */
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#define _COGL_OBJECT_DEBUG_NEW(type_name, obj)
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#define _COGL_OBJECT_DEBUG_REF(type_name, obj)
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#define _COGL_OBJECT_DEBUG_UNREF(type_name, obj)
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#define COGL_OBJECT_DEBUG_FREE(obj)
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#endif /* COGL_OBJECT_DEBUG */
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/* For temporary compatability */
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#define _COGL_HANDLE_DEBUG_NEW _COGL_OBJECT_DEBUG_NEW
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#define _COGL_HANDLE_DEBUG_REF _COGL_OBJECT_DEBUG_REF
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#define _COGL_HANDLE_DEBUG_UNREF _COGL_OBJECT_DEBUG_UNREF
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#define COGL_HANDLE_DEBUG_FREE COGL_OBJECT_DEBUG_FREE
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#define COGL_OBJECT_COMMON_DEFINE_WITH_CODE(TypeName, type_name, code) \
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\
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CoglObjectClass _cogl_##type_name##_class; \
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static unsigned long _cogl_object_##type_name##_count; \
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\
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static inline void \
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_cogl_object_##type_name##_inc (void) \
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{ \
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_cogl_object_##type_name##_count++; \
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} \
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\
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static inline void \
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_cogl_object_##type_name##_dec (void) \
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{ \
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_cogl_object_##type_name##_count--; \
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} \
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\
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static void \
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_cogl_object_##type_name##_indirect_free (CoglObject *obj) \
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{ \
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_cogl_##type_name##_free ((Cogl##TypeName *) obj); \
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_cogl_object_##type_name##_dec (); \
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} \
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\
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static Cogl##TypeName * \
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_cogl_##type_name##_object_new (Cogl##TypeName *new_obj) \
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{ \
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CoglObject *obj = (CoglObject *)&new_obj->_parent; \
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obj->ref_count = 0; \
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cogl_object_ref (obj); \
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obj->n_user_data_entries = 0; \
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obj->user_data_array = NULL; \
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\
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obj->klass = &_cogl_##type_name##_class; \
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if (!obj->klass->virt_free) \
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{ \
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_cogl_object_##type_name##_count = 0; \
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\
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if (_cogl_debug_instances == NULL) \
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_cogl_debug_instances = \
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g_hash_table_new (g_str_hash, g_str_equal); \
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\
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obj->klass->virt_free = \
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_cogl_object_##type_name##_indirect_free; \
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obj->klass->virt_unref = \
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_cogl_object_default_unref; \
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obj->klass->name = "Cogl"#TypeName, \
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\
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g_hash_table_insert (_cogl_debug_instances, \
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(void *) obj->klass->name, \
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&_cogl_object_##type_name##_count); \
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\
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{ code; } \
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} \
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\
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_cogl_object_##type_name##_inc (); \
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_COGL_OBJECT_DEBUG_NEW (TypeName, obj); \
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return new_obj; \
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} \
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\
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Cogl##TypeName * \
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_cogl_##type_name##_pointer_from_handle (CoglHandle handle) \
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{ \
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return handle; \
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}
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#define COGL_OBJECT_DEFINE_WITH_CODE(TypeName, type_name, code) \
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\
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COGL_OBJECT_COMMON_DEFINE_WITH_CODE(TypeName, type_name, code) \
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\
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gboolean \
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cogl_is_##type_name (void *object) \
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{ \
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CoglObject *obj = object; \
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\
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if (object == NULL) \
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return FALSE; \
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\
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return obj->klass == &_cogl_##type_name##_class; \
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}
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#define COGL_OBJECT_INTERNAL_DEFINE_WITH_CODE(TypeName, type_name, code) \
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\
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COGL_OBJECT_COMMON_DEFINE_WITH_CODE(TypeName, type_name, code) \
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\
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gboolean \
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_cogl_is_##type_name (void *object) \
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{ \
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CoglObject *obj = object; \
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\
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if (object == NULL) \
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return FALSE; \
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\
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return obj->klass == &_cogl_##type_name##_class; \
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}
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#define COGL_OBJECT_DEFINE_DEPRECATED_REF_COUNTING(type_name) \
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\
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void * G_GNUC_DEPRECATED \
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cogl_##type_name##_ref (void *object) \
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{ \
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if (!cogl_is_##type_name (object)) \
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return NULL; \
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\
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_COGL_OBJECT_DEBUG_REF (TypeName, object); \
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\
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cogl_handle_ref (object); \
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\
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return object; \
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} \
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\
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void G_GNUC_DEPRECATED \
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cogl_##type_name##_unref (void *object) \
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{ \
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if (!cogl_is_##type_name (object)) \
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{ \
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g_warning (G_STRINGIFY (cogl_##type_name##_unref) \
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": Ignoring unref of Cogl handle " \
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"due to type mismatch"); \
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return; \
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} \
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\
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_COGL_OBJECT_DEBUG_UNREF (TypeName, object); \
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\
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cogl_handle_unref (object); \
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}
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#define COGL_OBJECT_DEFINE(TypeName, type_name) \
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COGL_OBJECT_DEFINE_WITH_CODE (TypeName, type_name, (void) 0)
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#define COGL_OBJECT_INTERNAL_DEFINE(TypeName, type_name) \
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COGL_OBJECT_INTERNAL_DEFINE_WITH_CODE (TypeName, type_name, (void) 0)
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/* For temporary compatability */
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#define COGL_HANDLE_INTERNAL_DEFINE_WITH_CODE(TypeName, type_name, code) \
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\
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COGL_OBJECT_INTERNAL_DEFINE_WITH_CODE (TypeName, type_name, code) \
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\
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static Cogl##TypeName * \
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_cogl_##type_name##_handle_new (CoglHandle handle) \
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{ \
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return _cogl_##type_name##_object_new (handle); \
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}
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#define COGL_HANDLE_DEFINE_WITH_CODE(TypeName, type_name, code) \
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\
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COGL_OBJECT_DEFINE_WITH_CODE (TypeName, type_name, code) \
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\
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static Cogl##TypeName * \
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_cogl_##type_name##_handle_new (CoglHandle handle) \
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{ \
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return _cogl_##type_name##_object_new (handle); \
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}
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#define COGL_HANDLE_INTERNAL_DEFINE(TypeName, type_name) \
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COGL_HANDLE_INTERNAL_DEFINE_WITH_CODE (TypeName, type_name, (void) 0)
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#define COGL_HANDLE_DEFINE(TypeName, type_name) \
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COGL_HANDLE_DEFINE_WITH_CODE (TypeName, type_name, (void) 0)
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void
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_cogl_object_set_user_data (CoglObject *object,
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CoglUserDataKey *key,
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void *user_data,
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CoglUserDataDestroyInternalCallback destroy);
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void
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_cogl_object_default_unref (void *obj);
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#endif /* __COGL_OBJECT_PRIVATE_H */
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