/*

-----------------------------------------------------------------------------

This source file is part of OGRE

    (Object-oriented Graphics Rendering Engine)

For the latest info, see http://www.ogre3d.org/

 Copyright (c) 2000-2014 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.

-----------------------------------------------------------------------------

*/

#include "OgreStableHeaders.h"

#include "OgrePose.h"

namespace Ogre {

    //---------------------------------------------------------------------

    Pose::Pose(ushort target, const String& name)

        : mTarget(target), mName(name)

    {

    }

    //---------------------------------------------------------------------

    void Pose::addVertex(uint32 index, const Vector3f& offset)

    {

        OgreAssert(mNormalsMap.empty(),

                   "Inconsistent calls to addVertex, must include normals always or never");

        if(offset.squaredLength() < 1e-6f)

        {

            return;

        }

        mVertexOffsetMap[index] = offset;

        mBuffer.reset();

    }

    //---------------------------------------------------------------------

    void Pose::addVertex(uint32 index, const Vector3f& offset, const Vector3f& normal)

    {

        OgreAssert(mVertexOffsetMap.empty() || !mNormalsMap.empty(),

                   "Inconsistent calls to addVertex, must include normals always or never");

        if(offset.squaredLength() < 1e-6f && normal.squaredLength() < 1e-6f)

        {

            return;

        }

        mVertexOffsetMap[index] = offset;

        mNormalsMap[index] = normal;

        mBuffer.reset();

    }

    //---------------------------------------------------------------------

    void Pose::removeVertex(uint32 index)

    {

        VertexOffsetMap::iterator i = mVertexOffsetMap.find(index);

        if (i != mVertexOffsetMap.end())

        {

            mVertexOffsetMap.erase(i);

            mBuffer.reset();

        }

        NormalsMap::iterator j = mNormalsMap.find(index);

        if (j != mNormalsMap.end())

        {

            mNormalsMap.erase(j);

        }

    }

    //---------------------------------------------------------------------

    void Pose::clearVertices(void)

    {

        mVertexOffsetMap.clear();

        mNormalsMap.clear();

        mBuffer.reset();

    }

    //---------------------------------------------------------------------

    Pose::ConstVertexOffsetIterator 

        Pose::getVertexOffsetIterator(void) const

    {

        return ConstVertexOffsetIterator(mVertexOffsetMap.begin(), mVertexOffsetMap.end());

    }

    //---------------------------------------------------------------------

    Pose::VertexOffsetIterator 

        Pose::getVertexOffsetIterator(void)

    {

        return VertexOffsetIterator(mVertexOffsetMap.begin(), mVertexOffsetMap.end());

    }

    //---------------------------------------------------------------------

    Pose::ConstNormalsIterator Pose::getNormalsIterator(void) const

    {

        return ConstNormalsIterator(mNormalsMap.begin(), mNormalsMap.end());

    }

    //---------------------------------------------------------------------

    Pose::NormalsIterator Pose::getNormalsIterator(void)

    {

        return NormalsIterator(mNormalsMap.begin(), mNormalsMap.end());

    }

    //---------------------------------------------------------------------

    const HardwareVertexBufferSharedPtr& Pose::_getHardwareVertexBuffer(const VertexData* origData) const

    {

        size_t numVertices = origData->vertexCount;

        if (!mBuffer)

        {

            // Create buffer

            size_t vertexSize = VertexElement::getTypeSize(VET_FLOAT3);

            bool normals = getIncludesNormals();

            if (normals)

                vertexSize += VertexElement::getTypeSize(VET_FLOAT3);

            mBuffer = HardwareBufferManager::getSingleton().createVertexBuffer(

                vertexSize, numVertices, HardwareBuffer::HBU_STATIC_WRITE_ONLY);

            HardwareBufferLockGuard bufLock(mBuffer, HardwareBuffer::HBL_DISCARD);

            float* pFloat = static_cast<float*>(bufLock.pData);

            // initialise - these will be the values used where no pose vertex is included

            memset(pFloat, 0, mBuffer->getSizeInBytes()); 

            if (normals)

            {

                // zeroes are fine for positions (deltas), but for normals we need the original

                // mesh normals, since delta normals don't work (re-normalisation would

                // always result in a blended normal even with full pose applied)

                const VertexElement* origNormElem = 

                    origData->vertexDeclaration->findElementBySemantic(VES_NORMAL, 0);

                assert(origNormElem);

                const HardwareVertexBufferSharedPtr& origBuffer = 

                    origData->vertexBufferBinding->getBuffer(origNormElem->getSource());

                HardwareBufferLockGuard origBufLock(origBuffer, HardwareBuffer::HBL_READ_ONLY);

                float* pDst = pFloat + 3;

                float* pSrc;

                origNormElem->baseVertexPointerToElement(origBufLock.pData, &pSrc);

                for (size_t v = 0; v < numVertices; ++v)

                {

                    memcpy(pDst, pSrc, sizeof(float)*3);

                    pDst += 6;

                    pSrc = (float*)(((char*)pSrc) + origBuffer->getVertexSize());

                }

            }

            // Set each vertex

            VertexOffsetMap::const_iterator v = mVertexOffsetMap.begin();

            NormalsMap::const_iterator n = mNormalsMap.begin();

            size_t numFloatsPerVertex = normals ? 6: 3;

            while(v != mVertexOffsetMap.end())

            {

                // Remember, vertex maps are *sparse* so may have missing entries

                // This is why we skip

                float* pDst = pFloat + (numFloatsPerVertex * v->first);

                *pDst++ = v->second[0];

                *pDst++ = v->second[1];

                *pDst++ = v->second[2];

                ++v;

                if (normals)

                {

                    *pDst++ = n->second[0];

                    *pDst++ = n->second[1];

                    *pDst++ = n->second[2];

                    ++n;

                }

            }

        }

        return mBuffer;

    }

    //---------------------------------------------------------------------

    Pose* Pose::clone(void) const

    {

        Pose* newPose = OGRE_NEW Pose(mTarget, mName);

        newPose->mVertexOffsetMap = mVertexOffsetMap;

        newPose->mNormalsMap = mNormalsMap;

        // Allow buffer to recreate itself, contents may change anyway

        return newPose;

    }

}