author | William Roberts <williamr@symbian.org> |
Tue, 13 Jul 2010 17:02:10 +0100 | |
changeset 113 | f3c3c510a760 |
parent 0 | 5d03bc08d59c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of the License "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: M3G base object class internal interface |
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* |
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*/ |
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|
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#ifndef __M3G_OBJECT_H__ |
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#define __M3G_OBJECT_H__ |
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|
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/*! |
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* \internal |
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* \file |
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* \brief M3G base object class internal interface |
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* |
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* The fundamental feature of the object model is that each object |
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* instance structure includes the base class structure as its first |
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* member. Consequently, pointers to derived classes can be resolved |
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* to pointers to base classes by simple casts, and things such as |
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* virtual function pointers can be found at a fixed offset regardless |
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* of the actual class of the object being dealt with. |
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* |
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* The per-class virtual function tables are laid out similarly to the |
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* class structures, with the base class table preceding the derived |
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* class table in memory. Currently, virtual function tables are |
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* constructed by hand, but they are only needed for non-abstract |
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* classes. |
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*/ |
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#include "m3g_interface.h" |
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#include "m3g_array.h" |
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/*---------------------------------------------------------------------- |
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* Object class definition |
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*--------------------------------------------------------------------*/ |
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typedef M3Gint (*m3gApplyAnimationFuncPtr) (Object *self, M3Gint time); |
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typedef M3Gbool (*m3gIsCompatibleFuncPtr) (M3Gint property); |
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typedef void (*m3gUpdatePropertyFuncPtr) (Object *self, M3Gint property, M3Gint valueSize, const M3Gfloat *value); |
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typedef M3Gint (*m3gGetReferencesFuncPtr) (Object *self, Object **references); |
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typedef Object* (*m3gFindFuncPtr) (Object *self, M3Gint userID); |
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typedef M3Gbool (*m3gDuplicateFuncPtr) (const Object *original, Object **clone, Object **pairs, M3Gint *numPairs); |
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typedef void (*m3gDestroyFuncPtr) (Object *obj); |
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/*! |
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* \internal |
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* \brief Object class virtual functions |
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*/ |
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typedef struct |
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{ |
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m3gApplyAnimationFuncPtr applyAnimation; |
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m3gIsCompatibleFuncPtr isCompatible; |
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m3gUpdatePropertyFuncPtr updateProperty; |
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m3gGetReferencesFuncPtr getReferences; |
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m3gFindFuncPtr find; |
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m3gDuplicateFuncPtr duplicate; |
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m3gDestroyFuncPtr destroy; |
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} ObjectVFTable; |
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/*! |
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* \internal |
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* \brief Internal object structure |
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* |
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* \note Part of this is JSR-184 Object3D related and doesn't apply to |
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* all native objects; namely, RenderContext does not use animation |
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* tracks for anything |
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*/ |
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struct M3GObjectImpl |
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{ |
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/*! \internal \brief Pointer to the interface that created this object */ |
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Interface *interface; |
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/*! |
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* \internal |
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* \brief Class ID (as in M3GClass) |
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* |
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* This is used to resolve the virtual function table pointer, |
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* among other things |
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*/ |
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M3Guint classID : 8; |
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/*! \internal \brief Reference count */ |
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M3Guint refCount : 24; |
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/*! \internal \brief Table for animation tracks */ |
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PointerArray *animTracks; |
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M3Gint userID; |
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}; |
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/* Some compile-time sanity checks... */ |
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M3G_CT_ASSERT(M3G_CLASS_WORLD <= 255); |
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//M3G_CT_ASSERT(sizeof(Object) == 16); |
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/* Self-validation */ |
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#if defined(M3G_DEBUG) |
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/*@notfunction@*/ |
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# define M3G_VALIDATE_OBJECT(obj) m3gValidateObject(obj) |
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static void m3gValidateObject(const void *pObj); |
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#else |
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# define M3G_VALIDATE_OBJECT(obj) |
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#endif |
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/*! |
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* \internal |
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* \brief Returns the interface of any M3GObject-derived object |
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*/ |
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/*@notfunction@*/ |
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#define M3G_INTERFACE(obj) (((const Object *)(obj))->interface) |
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/*! |
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* \internal |
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* \brief Returns the class ID of any M3GObject-derived object |
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*/ |
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/*@notfunction@*/ |
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#define M3G_CLASS(obj) ((M3GClass)(((const Object *)(obj))->classID)) |
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/*! |
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* \internal |
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* \brief Virtual function call macro |
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* |
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* \param className name of class |
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* \param pObj pointer to object instance |
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* \param funcName name of function to call |
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* |
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*/ |
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/*@notfunction@*/ |
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#define M3G_VFUNC(className, pObj, funcName) \ |
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(((className##VFTable*)m3gGetVFTable((Object*)(pObj)))->funcName) |
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static M3G_INLINE const ObjectVFTable *m3gGetVFTable(const Object *obj); |
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/*-------------------------------------------------------------------- |
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* Constructor |
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*------------------------------------------------------------------*/ |
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static void m3gInitObject(Object *object, |
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Interface *interface, |
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M3GClass classID); |
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/*------------------------------------------------------------------- |
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* Internal functions |
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*-----------------------------------------------------------------*/ |
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/*! \internal \brief Nicer form for the \c find virtual function */ |
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static M3G_INLINE Object *m3gFindID(Object *obj, M3Gint userID) |
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{ |
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return M3G_VFUNC(Object, obj, find)(obj, userID); |
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} |
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/* Reference handling */ |
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static void m3gSetRef(Object **ref, Object *obj); |
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#define M3G_ASSIGN_REF(ref, value) m3gSetRef((Object**)&(ref), (Object*) value) |
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/* Virtual functions */ |
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static M3Gint m3gObjectApplyAnimation (Object *self, M3Gint time); |
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static M3Gbool m3gObjectIsCompatible (M3Gint property); |
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static void m3gObjectUpdateProperty (Object *self, M3Gint property, M3Gint valueSize, const M3Gfloat *value); |
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static M3Gint m3gObjectDoGetReferences(Object *self, Object **references); |
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static Object* m3gObjectFindID (Object *self, M3Gint userID); |
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static M3Gbool m3gObjectDuplicate (const Object *original, Object **clone, Object **pairs, M3Gint *numPairs); |
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static void m3gDestroyObject (Object *object); |
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#if defined(M3G_LOGLEVEL) |
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static const char *m3gClassName(M3GClass classID); |
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#else |
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/*lint -save -e607 this is intentional */ |
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# define m3gClassName(id) " ## id ## " |
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/*lint -restore */ |
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#endif |
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#endif /*__M3G_OBJECT_H__*/ |