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Ogre::VertexDeclaration Class Reference

This class declares the format of a set of vertex inputs, which can be issued to the rendering API through a RenderOperation. More...

#include <OgreHardwareVertexBuffer.h>

Inheritance diagram for Ogre::VertexDeclaration:

Ogre::D3D9VertexDeclaration List of all members.

Public Types

typedef std::list< VertexElement > VertexElementList
 Defines the list of vertex elements that makes up this declaration.


Public Member Functions

 VertexDeclaration ()
 Standard constructor, not you should use HardwareBufferManager::createVertexDeclaration.

virtual ~VertexDeclaration ()
size_t getElementCount (void)
 Get the number of elements in the declaration.

const VertexElementList & getElements (void) const
 Gets read-only access to the list of vertex elements.

const VertexElement * getElement (unsigned short index)
 Get a single element.

void sort (void)
 Sorts the elements in this list to be compatible with the maximum number of rendering APIs / graphics cards.

void closeGapsInSource (void)
 Remove any gaps in the source buffer list used by this declaration.

VertexDeclaration * getAutoOrganisedDeclaration (bool skeletalAnimation, bool vertexAnimation)
 Generates a new VertexDeclaration for optimal usage based on the current vertex declaration, which can be used with VertexData::reorganiseBuffers later if you wish, or simply used as a template.

unsigned short getMaxSource (void) const
 Gets the indeex of the highest source value referenced by this declaration.

virtual const VertexElement & addElement (unsigned short source, size_t offset, VertexElementType theType, VertexElementSemantic semantic, unsigned short index=0)
 Adds a new VertexElement to this declaration.

virtual const VertexElement & insertElement (unsigned short atPosition, unsigned short source, size_t offset, VertexElementType theType, VertexElementSemantic semantic, unsigned short index=0)
 Inserts a new VertexElement at a given position in this declaration.

virtual void removeElement (unsigned short elem_index)
 Remove the element at the given index from this declaration.

virtual void removeElement (VertexElementSemantic semantic, unsigned short index=0)
 Remove the element with the given semantic and usage index.

virtual void removeAllElements (void)
 Remove all elements.

virtual void modifyElement (unsigned short elem_index, unsigned short source, size_t offset, VertexElementType theType, VertexElementSemantic semantic, unsigned short index=0)
 Modify an element in-place, params as addElement.

virtual const VertexElement * findElementBySemantic (VertexElementSemantic sem, unsigned short index=0)
 Finds a VertexElement with the given semantic, and index if there is more than one element with the same semantic.

virtual VertexElementList findElementsBySource (unsigned short source)
 Gets a list of elements which use a given source.

virtual size_t getVertexSize (unsigned short source)
 Gets the vertex size defined by this declaration for a given source.

virtual VertexDeclaration * clone (void)
 Clones this declaration.

bool operator== (const VertexDeclaration &rhs) const
bool operator!= (const VertexDeclaration &rhs) const

Static Public Member Functions

bool vertexElementLess (const VertexElement &e1, const VertexElement &e2)
 Sort routine for vertex elements.


Protected Attributes

VertexElementList mElementList

Detailed Description

This class declares the format of a set of vertex inputs, which can be issued to the rendering API through a RenderOperation.

Remarks:
You should be aware that the ordering and structure of the VertexDeclaration can be very important on DirectX with older cards,so if you want to maintain maximum compatibility with all render systems and all cards you should be careful to follow these rules:
  1. VertexElements should be added in the following order, and the order of the elements within a shared buffer should be as follows: position, blending weights, normals, diffuse colours, specular colours, texture coordinates (in order, with no gaps)
  2. You must not have unused gaps in your buffers which are not referenced by any VertexElement
  3. You must not cause the buffer & offset settings of 2 VertexElements to overlap
Whilst GL and more modern graphics cards in D3D will allow you to defy these rules, sticking to them will ensure that your buffers have the maximum compatibility.
Like the other classes in this functional area, these declarations should be created and destroyed using the HardwareBufferManager.

Definition at line 287 of file OgreHardwareVertexBuffer.h.

Member Typedef Documentation

typedef std::list<VertexElement> Ogre::VertexDeclaration::VertexElementList
 

Defines the list of vertex elements that makes up this declaration.

Definition at line 291 of file OgreHardwareVertexBuffer.h.

Constructor & Destructor Documentation

Ogre::VertexDeclaration::VertexDeclaration (   ) 
 

Standard constructor, not you should use HardwareBufferManager::createVertexDeclaration.

virtual Ogre::VertexDeclaration::~VertexDeclaration (   )  [virtual]
 

Member Function Documentation

virtual const VertexElement& Ogre::VertexDeclaration::addElement (  unsigned short  source,
size_t  offset,
VertexElementType  theType,
VertexElementSemantic  semantic,
unsigned short  index = 0
)  [virtual]
 

Adds a new VertexElement to this declaration.

Remarks:
This method adds a single element (positions, normals etc) to the end of the vertex declaration. Please read the information in VertexDeclaration about the importance of ordering and structure for compatibility with older D3D drivers.
Parameters:
source The binding index of HardwareVertexBuffer which will provide the source for this element. See VertexBufferBindingState for full information.
offset The offset in bytes where this element is located in the buffer
theType The data format of the element (3 floats, a colour etc)
semantic The meaning of the data (position, normal, diffuse colour etc)
index Optional index for multi-input elements like texture coordinates
Returns:
A reference to the VertexElement added.

Reimplemented in Ogre::D3D9VertexDeclaration.

virtual VertexDeclaration* Ogre::VertexDeclaration::clone (  void   )  [virtual]
 

Clones this declaration.

void Ogre::VertexDeclaration::closeGapsInSource (  void   ) 
 

Remove any gaps in the source buffer list used by this declaration.

Remarks:
This is useful if you've modified a declaration and want to remove any gaps in the list of buffers being used. Note, however, that if this declaration is already being used with a VertexBufferBinding, you will need to alter that too. This method is mainly useful when reorganising buffers based on an altered declaration.
Note:
This will cause the vertex declaration to be re-sorted.

virtual const VertexElement* Ogre::VertexDeclaration::findElementBySemantic (  VertexElementSemantic  sem,
unsigned short  index = 0
)  [virtual]
 

Finds a VertexElement with the given semantic, and index if there is more than one element with the same semantic.

Remarks:
If the element is not found, this method returns null.

virtual VertexElementList Ogre::VertexDeclaration::findElementsBySource (  unsigned short  source  )  [virtual]
 

Gets a list of elements which use a given source.

Remarks:
Note that the list of elements is returned by value therefore is separate from the declaration as soon as this method returns.

VertexDeclaration* Ogre::VertexDeclaration::getAutoOrganisedDeclaration (  bool  skeletalAnimation,
bool  vertexAnimation
) 
 

Generates a new VertexDeclaration for optimal usage based on the current vertex declaration, which can be used with VertexData::reorganiseBuffers later if you wish, or simply used as a template.

Remarks:
Different buffer organisations and buffer usages will be returned depending on the parameters passed to this method.
Parameters:
skeletalAnimation Whether this vertex data is going to be skeletally animated
vertexAnimation Whether this vertex data is going to be vertex animated

const VertexElement* Ogre::VertexDeclaration::getElement (  unsigned short  index  ) 
 

Get a single element.

size_t Ogre::VertexDeclaration::getElementCount (  void   ) 
 

Get the number of elements in the declaration.

Definition at line 302 of file OgreHardwareVertexBuffer.h.

const VertexElementList& Ogre::VertexDeclaration::getElements (  void   )  const
 

Gets read-only access to the list of vertex elements.

unsigned short Ogre::VertexDeclaration::getMaxSource (  void   )  const
 

Gets the indeex of the highest source value referenced by this declaration.

virtual size_t Ogre::VertexDeclaration::getVertexSize (  unsigned short  source  )  [virtual]
 

Gets the vertex size defined by this declaration for a given source.

virtual const VertexElement& Ogre::VertexDeclaration::insertElement (  unsigned short  atPosition,
unsigned short  source,
size_t  offset,
VertexElementType  theType,
VertexElementSemantic  semantic,
unsigned short  index = 0
)  [virtual]
 

Inserts a new VertexElement at a given position in this declaration.

Remarks:
This method adds a single element (positions, normals etc) at a given position in this vertex declaration. Please read the information in VertexDeclaration about the importance of ordering and structure for compatibility with older D3D drivers.
Parameters:
source The binding index of HardwareVertexBuffer which will provide the source for this element. See VertexBufferBindingState for full information.
offset The offset in bytes where this element is located in the buffer
theType The data format of the element (3 floats, a colour etc)
semantic The meaning of the data (position, normal, diffuse colour etc)
index Optional index for multi-input elements like texture coordinates
Returns:
A reference to the VertexElement added.

Reimplemented in Ogre::D3D9VertexDeclaration.

virtual void Ogre::VertexDeclaration::modifyElement (  unsigned short  elem_index,
unsigned short  source,
size_t  offset,
VertexElementType  theType,
VertexElementSemantic  semantic,
unsigned short  index = 0
)  [virtual]
 

Modify an element in-place, params as addElement.

Remarks:
Please read the information in VertexDeclaration about the importance of ordering and structure for compatibility with older D3D drivers.

Reimplemented in Ogre::D3D9VertexDeclaration.

bool Ogre::VertexDeclaration::operator!= (  const VertexDeclaration &  rhs  )  const
 

Definition at line 442 of file OgreHardwareVertexBuffer.h.

bool Ogre::VertexDeclaration::operator== (  const VertexDeclaration &  rhs  )  const
 

Definition at line 425 of file OgreHardwareVertexBuffer.h.

References mElementList.

virtual void Ogre::VertexDeclaration::removeAllElements (  void   )  [virtual]
 

Remove all elements.

Reimplemented in Ogre::D3D9VertexDeclaration.

virtual void Ogre::VertexDeclaration::removeElement (  VertexElementSemantic  semantic,
unsigned short  index = 0
)  [virtual]
 

Remove the element with the given semantic and usage index.

Remarks:
In this case 'index' means the usage index for repeating elements such as texture coordinates. For other elements this will always be 0 and does not refer to the index in the vector.

Reimplemented in Ogre::D3D9VertexDeclaration.

virtual void Ogre::VertexDeclaration::removeElement (  unsigned short  elem_index  )  [virtual]
 

Remove the element at the given index from this declaration.

Reimplemented in Ogre::D3D9VertexDeclaration.

void Ogre::VertexDeclaration::sort (  void   ) 
 

Sorts the elements in this list to be compatible with the maximum number of rendering APIs / graphics cards.

Remarks:
Older graphics cards require vertex data to be presented in a more rigid way, as defined in the main documentation for this class. As well as the ordering being important, where shared source buffers are used, the declaration must list all the elements for each source in turn.

bool Ogre::VertexDeclaration::vertexElementLess (  const VertexElement &  e1,
const VertexElement &  e2
)  [static]
 

Sort routine for vertex elements.

Member Data Documentation

VertexElementList Ogre::VertexDeclaration::mElementList [protected]
 

Definition at line 295 of file OgreHardwareVertexBuffer.h.

Referenced by operator==().

The documentation for this class was generated from the following file:

Copyright © 2000-2005 by The OGRE Team
Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Sun Mar 12 14:39:17 2006