/* ----------------------------------------------------------------------------- This source file is part of OGRE (Object-oriented Graphics Rendering Engine) For the latest info, see http://www.ogre3d.org/ Copyright (c) 2000-2006 Torus Knot Software Ltd Also see acknowledgements in Readme.html This program is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA, or go to http://www.gnu.org/copyleft/lesser.txt. You may alternatively use this source under the terms of a specific version of the OGRE Unrestricted License provided you have obtained such a license from Torus Knot Software Ltd. ----------------------------------------------------------------------------- */ #ifndef __HardwareVertexBuffer__ #define __HardwareVertexBuffer__ // Precompiler options #include "OgrePrerequisites.h" #include "OgreHardwareBuffer.h" #include "OgreSharedPtr.h" #include "OgreColourValue.h" namespace Ogre { /** Specialisation of HardwareBuffer for a vertex buffer. */ class _OgreExport HardwareVertexBuffer : public HardwareBuffer { protected: size_t mNumVertices; size_t mVertexSize; public: /// Should be called by HardwareBufferManager HardwareVertexBuffer(size_t vertexSize, size_t numVertices, HardwareBuffer::Usage usage, bool useSystemMemory, bool useShadowBuffer); ~HardwareVertexBuffer(); /// Gets the size in bytes of a single vertex in this buffer size_t getVertexSize(void) const { return mVertexSize; } /// Get the number of vertices in this buffer size_t getNumVertices(void) const { return mNumVertices; } // NB subclasses should override lock, unlock, readData, writeData }; /** Shared pointer implementation used to share index buffers. */ class _OgreExport HardwareVertexBufferSharedPtr : public SharedPtr { public: HardwareVertexBufferSharedPtr() : SharedPtr() {} explicit HardwareVertexBufferSharedPtr(HardwareVertexBuffer* buf); }; /// Vertex element semantics, used to identify the meaning of vertex buffer contents enum VertexElementSemantic { /// Position, 3 reals per vertex VES_POSITION = 1, /// Blending weights VES_BLEND_WEIGHTS = 2, /// Blending indices VES_BLEND_INDICES = 3, /// Normal, 3 reals per vertex VES_NORMAL = 4, /// Diffuse colours VES_DIFFUSE = 5, /// Specular colours VES_SPECULAR = 6, /// Texture coordinates VES_TEXTURE_COORDINATES = 7, /// Binormal (Y axis if normal is Z) VES_BINORMAL = 8, /// Tangent (X axis if normal is Z) VES_TANGENT = 9 }; /// Vertex element type, used to identify the base types of the vertex contents enum VertexElementType { VET_FLOAT1 = 0, VET_FLOAT2 = 1, VET_FLOAT3 = 2, VET_FLOAT4 = 3, /// alias to more specific colour type - use the current rendersystem's colour packing VET_COLOUR = 4, VET_SHORT1 = 5, VET_SHORT2 = 6, VET_SHORT3 = 7, VET_SHORT4 = 8, VET_UBYTE4 = 9, /// D3D style compact colour VET_COLOUR_ARGB = 10, /// GL style compact colour VET_COLOUR_ABGR = 11 }; /** This class declares the usage of a single vertex buffer as a component of a complete VertexDeclaration. @remarks Several vertex buffers can be used to supply the input geometry for a rendering operation, and in each case a vertex buffer can be used in different ways for different operations; the buffer itself does not define the semantics (position, normal etc), the VertexElement class does. */ class _OgreExport VertexElement { protected: /// The source vertex buffer, as bound to an index using VertexBufferBinding unsigned short mSource; /// The offset in the buffer that this element starts at size_t mOffset; /// The type of element VertexElementType mType; /// The meaning of the element VertexElementSemantic mSemantic; /// Index of the item, only applicable for some elements like texture coords unsigned short mIndex; public: /// Constructor, should not be called directly, call VertexDeclaration::addElement VertexElement(unsigned short source, size_t offset, VertexElementType theType, VertexElementSemantic semantic, unsigned short index = 0); /// Gets the vertex buffer index from where this element draws it's values unsigned short getSource(void) const { return mSource; } /// Gets the offset into the buffer where this element starts size_t getOffset(void) const { return mOffset; } /// Gets the data format of this element VertexElementType getType(void) const { return mType; } /// Gets the meaning of this element VertexElementSemantic getSemantic(void) const { return mSemantic; } /// Gets the index of this element, only applicable for repeating elements unsigned short getIndex(void) const { return mIndex; } /// Gets the size of this element in bytes size_t getSize(void) const; /// Utility method for helping to calculate offsets static size_t getTypeSize(VertexElementType etype); /// Utility method which returns the count of values in a given type static unsigned short getTypeCount(VertexElementType etype); /** Simple converter function which will turn a single-value type into a multi-value type based on a parameter. */ static VertexElementType multiplyTypeCount(VertexElementType baseType, unsigned short count); /** Simple converter function which will a type into it's single-value equivalent - makes switches on type easier. */ static VertexElementType getBaseType(VertexElementType multiType); /** Utility method for converting colour from one packed 32-bit colour type to another. @param srcType The source type @param dstType The destination type @param ptr Read / write value to change */ static void convertColourValue(VertexElementType srcType, VertexElementType dstType, uint32* ptr); /** Utility method for converting colour to a packed 32-bit colour type. @param src source colour @param dst The destination type */ static uint32 convertColourValue(const ColourValue& src, VertexElementType dst); /** Utility method to get the most appropriate packed colour vertex element format. */ static VertexElementType getBestColourVertexElementType(void); inline bool operator== (const VertexElement& rhs) const { if (mType != rhs.mType || mIndex != rhs.mIndex || mOffset != rhs.mOffset || mSemantic != rhs.mSemantic || mSource != rhs.mSource) return false; else return true; } /** Adjusts a pointer to the base of a vertex to point at this element. @remarks This variant is for void pointers, passed as a parameter because we can't rely on covariant return types. @param pBase Pointer to the start of a vertex in this buffer. @param pElem Pointer to a pointer which will be set to the start of this element. */ inline void baseVertexPointerToElement(void* pBase, void** pElem) const { // The only way we can do this is to cast to char* in order to use byte offset // then cast back to void*. *pElem = static_cast( static_cast(pBase) + mOffset); } /** Adjusts a pointer to the base of a vertex to point at this element. @remarks This variant is for float pointers, passed as a parameter because we can't rely on covariant return types. @param pBase Pointer to the start of a vertex in this buffer. @param pElem Pointer to a pointer which will be set to the start of this element. */ inline void baseVertexPointerToElement(void* pBase, float** pElem) const { // The only way we can do this is to cast to char* in order to use byte offset // then cast back to float*. However we have to go via void* because casting // directly is not allowed *pElem = static_cast( static_cast( static_cast(pBase) + mOffset)); } /** Adjusts a pointer to the base of a vertex to point at this element. @remarks This variant is for RGBA pointers, passed as a parameter because we can't rely on covariant return types. @param pBase Pointer to the start of a vertex in this buffer. @param pElem Pointer to a pointer which will be set to the start of this element. */ inline void baseVertexPointerToElement(void* pBase, RGBA** pElem) const { *pElem = static_cast( static_cast( static_cast(pBase) + mOffset)); } /** Adjusts a pointer to the base of a vertex to point at this element. @remarks This variant is for char pointers, passed as a parameter because we can't rely on covariant return types. @param pBase Pointer to the start of a vertex in this buffer. @param pElem Pointer to a pointer which will be set to the start of this element. */ inline void baseVertexPointerToElement(void* pBase, unsigned char** pElem) const { *pElem = static_cast(pBase) + mOffset; } /** Adjusts a pointer to the base of a vertex to point at this element. @remarks This variant is for ushort pointers, passed as a parameter because we can't rely on covariant return types. @param pBase Pointer to the start of a vertex in this buffer. @param pElem Pointer to a pointer which will be set to the start of this element. */ inline void baseVertexPointerToElement(void* pBase, unsigned short** pElem) const { *pElem = static_cast(pBase) + mOffset; } }; /** 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. @par Like the other classes in this functional area, these declarations should be created and destroyed using the HardwareBufferManager. */ class _OgreExport VertexDeclaration { public: /// Defines the list of vertex elements that makes up this declaration typedef std::list VertexElementList; /// Sort routine for vertex elements static bool vertexElementLess(const VertexElement& e1, const VertexElement& e2); protected: VertexElementList mElementList; public: /// Standard constructor, not you should use HardwareBufferManager::createVertexDeclaration VertexDeclaration(); virtual ~VertexDeclaration(); /** Get the number of elements in the declaration. */ size_t getElementCount(void) { return mElementList.size(); } /** Gets read-only access to the list of vertex elements. */ const VertexElementList& getElements(void) const; /** Get a single element. */ const VertexElement* getElement(unsigned short index); /** 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. */ void sort(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. */ void closeGapsInSource(void); /** 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. @param skeletalAnimation Whether this vertex data is going to be skeletally animated @param vertexAnimation Whether this vertex data is going to be vertex animated */ VertexDeclaration* getAutoOrganisedDeclaration(bool skeletalAnimation, bool vertexAnimation); /** Gets the indeex of the highest source value referenced by this declaration. */ unsigned short getMaxSource(void) const; /** 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. @param source The binding index of HardwareVertexBuffer which will provide the source for this element. See VertexBufferBindingState for full information. @param offset The offset in bytes where this element is located in the buffer @param theType The data format of the element (3 floats, a colour etc) @param semantic The meaning of the data (position, normal, diffuse colour etc) @param index Optional index for multi-input elements like texture coordinates @returns A reference to the VertexElement added. */ virtual const VertexElement& addElement(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. @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. @param source The binding index of HardwareVertexBuffer which will provide the source for this element. See VertexBufferBindingState for full information. @param offset The offset in bytes where this element is located in the buffer @param theType The data format of the element (3 floats, a colour etc) @param semantic The meaning of the data (position, normal, diffuse colour etc) @param index Optional index for multi-input elements like texture coordinates @returns A reference to the VertexElement added. */ virtual const VertexElement& insertElement(unsigned short atPosition, unsigned short source, size_t offset, VertexElementType theType, VertexElementSemantic semantic, unsigned short index = 0); /** Remove the element at the given index from this declaration. */ virtual void removeElement(unsigned short elem_index); /** 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. */ virtual void removeElement(VertexElementSemantic semantic, unsigned short index = 0); /** Remove all elements. */ virtual void removeAllElements(void); /** 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. */ virtual void modifyElement(unsigned short elem_index, unsigned short source, size_t offset, VertexElementType theType, VertexElementSemantic semantic, unsigned short index = 0); /** 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 const VertexElement* findElementBySemantic(VertexElementSemantic sem, unsigned short index = 0); /** Based on the current elements, gets the size of the vertex for a given buffer source. @param source The buffer binding index for which to get the vertex size. */ /** 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. */ virtual VertexElementList findElementsBySource(unsigned short source); /** Gets the vertex size defined by this declaration for a given source. */ virtual size_t getVertexSize(unsigned short source); /** Clones this declaration. */ virtual VertexDeclaration* clone(void); inline bool operator== (const VertexDeclaration& rhs) const { if (mElementList.size() != rhs.mElementList.size()) return false; VertexElementList::const_iterator i, iend, rhsi, rhsiend; iend = mElementList.end(); rhsiend = rhs.mElementList.end(); rhsi = rhs.mElementList.begin(); for (i = mElementList.begin(); i != iend && rhsi != rhsiend; ++i, ++rhsi) { if ( !(*i == *rhsi) ) return false; } return true; } inline bool operator!= (const VertexDeclaration& rhs) const { return !(*this == rhs); } }; /** Records the state of all the vertex buffer bindings required to provide a vertex declaration with the input data it needs for the vertex elements. @remarks Why do we have this binding list rather than just have VertexElement referring to the vertex buffers direct? Well, in the underlying APIs, binding the vertex buffers to an index (or 'stream') is the way that vertex data is linked, so this structure better reflects the realities of that. In addition, by separating the vertex declaration from the list of vertex buffer bindings, it becomes possible to reuse bindings between declarations and vice versa, giving opportunities to reduce the state changes required to perform rendering. @par Like the other classes in this functional area, these binding maps should be created and destroyed using the HardwareBufferManager. */ class _OgreExport VertexBufferBinding { public: /// Defines the vertex buffer bindings used as source for vertex declarations typedef std::map VertexBufferBindingMap; protected: VertexBufferBindingMap mBindingMap; mutable unsigned short mHighIndex; public: /// Constructor, should not be called direct, use HardwareBufferManager::createVertexBufferBinding VertexBufferBinding(); virtual ~VertexBufferBinding(); /** Set a binding, associating a vertex buffer with a given index. @remarks If the index is already associated with a vertex buffer, the association will be replaced. This may cause the old buffer to be destroyed if nothing else is referring to it. You should assign bindings from 0 and not leave gaps, although you can bind them in any order. */ virtual void setBinding(unsigned short index, const HardwareVertexBufferSharedPtr& buffer); /** Removes an existing binding. */ virtual void unsetBinding(unsigned short index); /** Removes all the bindings. */ virtual void unsetAllBindings(void); /// Gets a read-only version of the buffer bindings virtual const VertexBufferBindingMap& getBindings(void) const; /// Gets the buffer bound to the given source index virtual const HardwareVertexBufferSharedPtr& getBuffer(unsigned short index) const; /// Gets whether a buffer is bound to the given source index virtual bool isBufferBound(unsigned short index) const; virtual size_t getBufferCount(void) const { return mBindingMap.size(); } /** Gets the highest index which has already been set, plus 1. @remarks This is to assist in binding the vertex buffers such that there are not gaps in the list. */ virtual unsigned short getNextIndex(void) const { return mHighIndex++; } /** Gets the last bound index. */ virtual unsigned short getLastBoundIndex(void) const; typedef std::map BindingIndexMap; /** Check whether any gaps in the bindings. */ virtual bool hasGaps(void) const; /** Remove any gaps in the bindings. @remarks This is useful if you've removed vertex buffer from this vertex buffer bindings and want to remove any gaps in the bindings. Note, however, that if this bindings is already being used with a VertexDeclaration, you will need to alter that too. This method is mainly useful when reorganising buffers manually. @param bindingIndexMap To be retrieve the binding index map that used to translation old index to new index; will be cleared by this method before fill-in. */ virtual void closeGaps(BindingIndexMap& bindingIndexMap); }; } #endif