OgreHardwareVertexBuffer.h

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/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2012 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#ifndef __HardwareVertexBuffer__
#define __HardwareVertexBuffer__

// Precompiler options
#include "OgrePrerequisites.h"
#include "OgreHardwareBuffer.h"
#include "OgreSharedPtr.h"
#include "OgreColourValue.h"

namespace Ogre {
    class HardwareBufferManagerBase;

    class _OgreExport HardwareVertexBuffer : public HardwareBuffer
    {
        protected:

            HardwareBufferManagerBase* mMgr;
            size_t mNumVertices;
            size_t mVertexSize;
            bool mIsInstanceData;
            size_t mInstanceDataStepRate;           
            virtual bool checkIfVertexInstanceDataIsSupported();

        public:
            HardwareVertexBuffer(HardwareBufferManagerBase* mgr, size_t vertexSize, size_t numVertices,
                HardwareBuffer::Usage usage, bool useSystemMemory, bool useShadowBuffer);
            ~HardwareVertexBuffer();
            HardwareBufferManagerBase* getManager() const { return mMgr; }
            size_t getVertexSize(void) const { return mVertexSize; }
            size_t getNumVertices(void) const { return mNumVertices; }
            bool getIsInstanceData() const { return mIsInstanceData; }
            void setIsInstanceData(const bool val);
            size_t getInstanceDataStepRate() const;
            void setInstanceDataStepRate(const size_t val);


            // NB subclasses should override lock, unlock, readData, writeData

    };

    class _OgreExport HardwareVertexBufferSharedPtr : public SharedPtr<HardwareVertexBuffer>
    {
    public:
        HardwareVertexBufferSharedPtr() : SharedPtr<HardwareVertexBuffer>() {}
        explicit HardwareVertexBufferSharedPtr(HardwareVertexBuffer* buf);


    };

    enum VertexElementSemantic {
        VES_POSITION = 1,
        VES_BLEND_WEIGHTS = 2,
        VES_BLEND_INDICES = 3,
        VES_NORMAL = 4,
        VES_DIFFUSE = 5,
        VES_SPECULAR = 6,
        VES_TEXTURE_COORDINATES = 7,
        VES_BINORMAL = 8,
        VES_TANGENT = 9,
        VES_COUNT = 9
    };

    enum VertexElementType
    {
        VET_FLOAT1 = 0,
        VET_FLOAT2 = 1,
        VET_FLOAT3 = 2,
        VET_FLOAT4 = 3,
        VET_COLOUR = 4,
        VET_SHORT1 = 5,
        VET_SHORT2 = 6,
        VET_SHORT3 = 7,
        VET_SHORT4 = 8,
        VET_UBYTE4 = 9,
        VET_COLOUR_ARGB = 10,
        VET_COLOUR_ABGR = 11
    };

    class _OgreExport VertexElement : public VertexDataAlloc
    {
    protected:
        unsigned short mSource;
        size_t mOffset;
        VertexElementType mType;
        VertexElementSemantic mSemantic;
        unsigned short mIndex;
    public:
        VertexElement() {}
        VertexElement(unsigned short source, size_t offset, VertexElementType theType,
            VertexElementSemantic semantic, unsigned short index = 0);
        unsigned short getSource(void) const { return mSource; }
        size_t getOffset(void) const { return mOffset; }
        VertexElementType getType(void) const { return mType; }
        VertexElementSemantic getSemantic(void) const { return mSemantic; }
        unsigned short getIndex(void) const { return mIndex; }
        size_t getSize(void) const;
        static size_t getTypeSize(VertexElementType etype);
        static unsigned short getTypeCount(VertexElementType etype);
        static VertexElementType multiplyTypeCount(VertexElementType baseType, unsigned short count);
        static VertexElementType getBaseType(VertexElementType multiType);

        static void convertColourValue(VertexElementType srcType,
            VertexElementType dstType, uint32* ptr);

        static uint32 convertColourValue(const ColourValue& src,
            VertexElementType dst);

        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;

        }
        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<void*>(
                static_cast<unsigned char*>(pBase) + mOffset);
        }
        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<float*>(
                static_cast<void*>(
                    static_cast<unsigned char*>(pBase) + mOffset));
        }

        inline void baseVertexPointerToElement(void* pBase, RGBA** pElem) const
        {
            *pElem = static_cast<RGBA*>(
                static_cast<void*>(
                    static_cast<unsigned char*>(pBase) + mOffset));
        }
        inline void baseVertexPointerToElement(void* pBase, unsigned char** pElem) const
        {
            *pElem = static_cast<unsigned char*>(pBase) + mOffset;
        }

        inline void baseVertexPointerToElement(void* pBase, unsigned short** pElem) const
        {
            *pElem = static_cast<unsigned short*>(
                static_cast<void*>(
                    static_cast<unsigned char*>(pBase) + mOffset));
        }


    };
    class _OgreExport VertexDeclaration : public VertexDataAlloc
    {
    public:
        typedef list<VertexElement>::type VertexElementList;
        static bool vertexElementLess(const VertexElement& e1, const VertexElement& e2);
    protected:
        VertexElementList mElementList;
    public:
        VertexDeclaration();
        virtual ~VertexDeclaration();

        size_t getElementCount(void) const { return mElementList.size(); }
        const VertexElementList& getElements(void) const;
        const VertexElement* getElement(unsigned short index) const;

        void sort(void);

        void closeGapsInSource(void);

        VertexDeclaration* getAutoOrganisedDeclaration(bool skeletalAnimation,
            bool vertexAnimation, bool vertexAnimationNormals) const;

        unsigned short getMaxSource(void) const;



        virtual const VertexElement& addElement(unsigned short source, size_t offset, VertexElementType theType,
            VertexElementSemantic semantic, unsigned short index = 0);
        virtual const VertexElement& insertElement(unsigned short atPosition,
            unsigned short source, size_t offset, VertexElementType theType,
            VertexElementSemantic semantic, unsigned short index = 0);

        virtual void removeElement(unsigned short elem_index);

        virtual void removeElement(VertexElementSemantic semantic, unsigned short index = 0);

        virtual void removeAllElements(void);

        virtual void modifyElement(unsigned short elem_index, unsigned short source, size_t offset, VertexElementType theType,
            VertexElementSemantic semantic, unsigned short index = 0);

        virtual const VertexElement* findElementBySemantic(VertexElementSemantic sem, unsigned short index = 0) const;
        virtual VertexElementList findElementsBySource(unsigned short source) const;

        virtual size_t getVertexSize(unsigned short source) const;
        
        virtual unsigned short getNextFreeTextureCoordinate() const;

        virtual VertexDeclaration* clone(HardwareBufferManagerBase* mgr = 0) const;

        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);
        }

    };

    class _OgreExport VertexBufferBinding : public VertexDataAlloc
    {
    public:
        typedef map<unsigned short, HardwareVertexBufferSharedPtr>::type VertexBufferBindingMap;
    protected:
        VertexBufferBindingMap mBindingMap;
        mutable unsigned short mHighIndex;
    public:
        VertexBufferBinding();
        virtual ~VertexBufferBinding();
        virtual void setBinding(unsigned short index, const HardwareVertexBufferSharedPtr& buffer);
        virtual void unsetBinding(unsigned short index);

        virtual void unsetAllBindings(void);

        virtual const VertexBufferBindingMap& getBindings(void) const;

        virtual const HardwareVertexBufferSharedPtr& getBuffer(unsigned short index) const;
        virtual bool isBufferBound(unsigned short index) const;

        virtual size_t getBufferCount(void) const { return mBindingMap.size(); }

        virtual unsigned short getNextIndex(void) const { return mHighIndex++; }

        virtual unsigned short getLastBoundIndex(void) const;

        typedef map<ushort, ushort>::type BindingIndexMap;

        virtual bool hasGaps(void) const;

        virtual void closeGaps(BindingIndexMap& bindingIndexMap);

        virtual bool getHasInstanceData() const;


    };
}
#endif