/*
-----------------------------------------------------------------------------
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 "OgreD3D9HardwarePixelBuffer.h"
#include "OgreD3D9Texture.h"
#include "OgreD3D9Mappings.h"
#include "OgreException.h"
#include "OgreLogManager.h"
#include "OgreStringConverter.h"
#include "OgreBitwise.h"
#include "OgreRoot.h"
#include "OgreRenderSystem.h"

namespace Ogre {

    OGRE_STATIC_MUTEX_INSTANCE(D3D9HardwarePixelBuffer::msDeviceAccessMutex);
//-----------------------------------------------------------------------------  

D3D9HardwarePixelBuffer::D3D9HardwarePixelBuffer(HardwareBuffer::Usage usage, 
                                                 D3D9Texture* ownerTexture):
    HardwarePixelBuffer(0, 0, 0, PF_UNKNOWN, usage, false, false),
    mDoMipmapGen(false), mHWMipmaps(false), mOwnerTexture(ownerTexture), 
    mRenderTexture(NULL)
{   
}
D3D9HardwarePixelBuffer::~D3D9HardwarePixelBuffer()
{
    D3D9_DEVICE_ACCESS_CRITICAL_SECTION

    destroyRenderTexture();
    
    DeviceToBufferResourcesIterator it = mMapDeviceToBufferResources.begin();

    while (it != mMapDeviceToBufferResources.end())
    {
        SAFE_RELEASE(it->second->surface);
        SAFE_RELEASE(it->second->volume);       
        if (it->second != NULL)
        {
            OGRE_FREE (it->second, MEMCATEGORY_RENDERSYS);
            it->second = NULL;
        }
        DeviceToBufferResourcesIterator deadi = it++;
        mMapDeviceToBufferResources.erase(deadi);
    }
}
//-----------------------------------------------------------------------------  
void D3D9HardwarePixelBuffer::bind(IDirect3DDevice9 *dev, IDirect3DSurface9 *surface, 
                                   IDirect3DSurface9* fsaaSurface,
                                   bool writeGamma, uint fsaa, const String& srcName,
                                   IDirect3DBaseTexture9 *mipTex)
{
    D3D9_DEVICE_ACCESS_CRITICAL_SECTION

    BufferResources* bufferResources = getBufferResources(dev);
    bool isNewBuffer = false;

    if (bufferResources == NULL)
    {
        bufferResources = createBufferResources();      
        mMapDeviceToBufferResources[dev] = bufferResources;
        isNewBuffer = true;
    }
        
    bufferResources->mipTex = mipTex;
    bufferResources->surface = surface;
    bufferResources->surface->AddRef();
    bufferResources->fSAASurface = fsaaSurface;

    D3DSURFACE_DESC desc;
    if(surface->GetDesc(&desc) != D3D_OK)
        OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Could not get surface information",
         "D3D9HardwarePixelBuffer::D3D9HardwarePixelBuffer");

    mWidth = desc.Width;
    mHeight = desc.Height;
    mDepth = 1;
    mFormat = D3D9Mappings::_getPF(desc.Format);
    // Default
    mRowPitch = mWidth;
    mSlicePitch = mHeight*mWidth;
    mSizeInBytes = PixelUtil::getMemorySize(mWidth, mHeight, mDepth, mFormat);  
    
    if(mUsage & TU_RENDERTARGET)
        updateRenderTexture(writeGamma, fsaa, srcName);

    if (isNewBuffer && mOwnerTexture->isLoaded() && mOwnerTexture->isManuallyLoaded())
    {
        DeviceToBufferResourcesIterator it = mMapDeviceToBufferResources.begin();

        while (it != mMapDeviceToBufferResources.end())
        {
            if (it->second != bufferResources && 
                it->second->surface != NULL &&
                it->first->TestCooperativeLevel() == D3D_OK &&
                dev->TestCooperativeLevel() == D3D_OK)
            {
                Box fullBufferBox(0,0,0,mWidth,mHeight,mDepth);
                PixelBox dstBox(fullBufferBox, mFormat);

                dstBox.data = OGRE_MALLOC (getSizeInBytes(), MEMCATEGORY_RESOURCE);
                blitToMemory(fullBufferBox, dstBox, it->second, it->first);
                blitFromMemory(dstBox, fullBufferBox, bufferResources);
                OGRE_FREE(dstBox.data, MEMCATEGORY_RESOURCE);
                break;
            }
            ++it;           
        }               
    }
}
//-----------------------------------------------------------------------------
void D3D9HardwarePixelBuffer::bind(IDirect3DDevice9 *dev, IDirect3DVolume9 *volume, IDirect3DBaseTexture9 *mipTex)
{
    D3D9_DEVICE_ACCESS_CRITICAL_SECTION

    BufferResources* bufferResources = getBufferResources(dev);
    bool isNewBuffer = false;

    if (bufferResources == NULL)
    {
        bufferResources = createBufferResources();
        mMapDeviceToBufferResources[dev] = bufferResources;
        isNewBuffer = true;
    }

    bufferResources->mipTex = mipTex;
    bufferResources->volume = volume;
    bufferResources->volume->AddRef();
    
    D3DVOLUME_DESC desc;
    if(volume->GetDesc(&desc) != D3D_OK)
        OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Could not get volume information",
         "D3D9HardwarePixelBuffer::D3D9HardwarePixelBuffer");
    mWidth = desc.Width;
    mHeight = desc.Height;
    mDepth = desc.Depth;
    mFormat = D3D9Mappings::_getPF(desc.Format);
    // Default
    mRowPitch = mWidth;
    mSlicePitch = mHeight*mWidth;
    mSizeInBytes = PixelUtil::getMemorySize(mWidth, mHeight, mDepth, mFormat);

    if (isNewBuffer && mOwnerTexture->isManuallyLoaded())
    {
        DeviceToBufferResourcesIterator it = mMapDeviceToBufferResources.begin();
        
        while (it != mMapDeviceToBufferResources.end())
        {
            if (it->second != bufferResources &&
                it->second->volume != NULL &&
                it->first->TestCooperativeLevel() == D3D_OK &&
                dev->TestCooperativeLevel() == D3D_OK)
            {
                Box fullBufferBox(0,0,0,mWidth,mHeight,mDepth);
                PixelBox dstBox(fullBufferBox, mFormat);

                dstBox.data = OGRE_MALLOC(getSizeInBytes(), MEMCATEGORY_RESOURCE);
                blitToMemory(fullBufferBox, dstBox, it->second, it->first);
                blitFromMemory(dstBox, fullBufferBox, bufferResources);
                OGRE_FREE(dstBox.data, MEMCATEGORY_RESOURCE);
                break;
            }
            ++it;           
        }               
    }
}

//-----------------------------------------------------------------------------  
D3D9HardwarePixelBuffer::BufferResources* D3D9HardwarePixelBuffer::getBufferResources(IDirect3DDevice9* d3d9Device)
{
    DeviceToBufferResourcesIterator it = mMapDeviceToBufferResources.find(d3d9Device);

    if (it != mMapDeviceToBufferResources.end())    
        return it->second;
    
    return NULL;
}

//-----------------------------------------------------------------------------  
D3D9HardwarePixelBuffer::BufferResources* D3D9HardwarePixelBuffer::createBufferResources()
{
    BufferResources* newResources = OGRE_ALLOC_T(BufferResources, 1, MEMCATEGORY_RENDERSYS);

    memset(newResources, 0, sizeof(BufferResources));

    return newResources;
}

//-----------------------------------------------------------------------------  
void D3D9HardwarePixelBuffer::destroyBufferResources(IDirect3DDevice9* d3d9Device)
{
    D3D9_DEVICE_ACCESS_CRITICAL_SECTION

    DeviceToBufferResourcesIterator it = mMapDeviceToBufferResources.find(d3d9Device);

    if (it != mMapDeviceToBufferResources.end())
    {
        SAFE_RELEASE(it->second->surface);
        SAFE_RELEASE(it->second->volume);           
        if (it->second != NULL)
        {
            OGRE_FREE (it->second, MEMCATEGORY_RENDERSYS);
            it->second = NULL;
        }
        mMapDeviceToBufferResources.erase(it);
    }
}

//-----------------------------------------------------------------------------  
void D3D9HardwarePixelBuffer::lockDeviceAccess()
{
    D3D9_DEVICE_ACCESS_LOCK;            
}

//-----------------------------------------------------------------------------  
void D3D9HardwarePixelBuffer::unlockDeviceAccess()
{
    D3D9_DEVICE_ACCESS_UNLOCK;                              
}

//-----------------------------------------------------------------------------  
// Util functions to convert a D3D locked box to a pixel box
void fromD3DLock(PixelBox &rval, const D3DLOCKED_RECT &lrect)
{
    size_t bpp = PixelUtil::getNumElemBytes(rval.format);
    if (bpp != 0)
    {
        rval.rowPitch = lrect.Pitch / bpp;
        rval.slicePitch = rval.rowPitch * rval.getHeight();
        assert((lrect.Pitch % bpp)==0);
    }
    else if (PixelUtil::isCompressed(rval.format))
    {
        rval.rowPitch = rval.getWidth();
        rval.slicePitch = rval.getWidth() * rval.getHeight();
    }
    else
    {
        OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, 
            "Invalid pixel format", "fromD3DLock");
    }

    rval.data = lrect.pBits;
}
void fromD3DLock(PixelBox &rval, const D3DLOCKED_BOX &lbox)
{
    size_t bpp = PixelUtil::getNumElemBytes(rval.format);
    if (bpp != 0)
    {
        rval.rowPitch = lbox.RowPitch / bpp;
        rval.slicePitch = lbox.SlicePitch / bpp;
        assert((lbox.RowPitch % bpp)==0);
        assert((lbox.SlicePitch % bpp)==0);
    }
    else if (PixelUtil::isCompressed(rval.format))
    {
        rval.rowPitch = rval.getWidth();
        rval.slicePitch = rval.getWidth() * rval.getHeight();
    }
    else
    {
        OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, 
            "Invalid pixel format", "fromD3DLock");
    }
    rval.data = lbox.pBits;
}
// Convert Ogre integer Box to D3D rectangle
RECT toD3DRECT(const Box &lockBox)
{
    RECT prect;
    assert(lockBox.getDepth() == 1);
    prect.left = static_cast<LONG>(lockBox.left);
    prect.right = static_cast<LONG>(lockBox.right);
    prect.top = static_cast<LONG>(lockBox.top);
    prect.bottom = static_cast<LONG>(lockBox.bottom);
    return prect;
}
// Convert Ogre integer Box to D3D box
D3DBOX toD3DBOX(const Box &lockBox)
{
    D3DBOX pbox;
    
    pbox.Left = static_cast<UINT>(lockBox.left);
    pbox.Right = static_cast<UINT>(lockBox.right);
    pbox.Top = static_cast<UINT>(lockBox.top);
    pbox.Bottom = static_cast<UINT>(lockBox.bottom);
    pbox.Front = static_cast<UINT>(lockBox.front);
    pbox.Back = static_cast<UINT>(lockBox.back);
    return pbox;
}
// Convert Ogre pixelbox extent to D3D rectangle
RECT toD3DRECTExtent(const PixelBox &lockBox)
{
    RECT prect;
    assert(lockBox.getDepth() == 1);
    prect.left = 0;
    prect.right = static_cast<LONG>(lockBox.getWidth());
    prect.top = 0;
    prect.bottom = static_cast<LONG>(lockBox.getHeight());
    return prect;
}
// Convert Ogre pixelbox extent to D3D box
D3DBOX toD3DBOXExtent(const PixelBox &lockBox)
{
    D3DBOX pbox;
    pbox.Left = 0;
    pbox.Right = static_cast<UINT>(lockBox.getWidth());
    pbox.Top = 0;
    pbox.Bottom = static_cast<UINT>(lockBox.getHeight());
    pbox.Front = 0;
    pbox.Back = static_cast<UINT>(lockBox.getDepth());
    return pbox;
}
//-----------------------------------------------------------------------------  
PixelBox D3D9HardwarePixelBuffer::lockImpl(const Image::Box &lockBox,  LockOptions options)
{   
    D3D9_DEVICE_ACCESS_CRITICAL_SECTION

    // Check for misuse
    if(mUsage & TU_RENDERTARGET)
        OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "DirectX does not allow locking of or directly writing to RenderTargets. Use blitFromMemory if you need the contents.",
            "D3D9HardwarePixelBuffer::lockImpl");       
    // Set locking flags according to options
    DWORD flags = 0;
    switch(options)
    {
    case HBL_DISCARD:
        // D3D only likes D3DLOCK_DISCARD if you created the texture with D3DUSAGE_DYNAMIC
        // debug runtime flags this up, could cause problems on some drivers
        if (mUsage & HBU_DYNAMIC)
            flags |= D3DLOCK_DISCARD;
        break;
    case HBL_READ_ONLY:
        flags |= D3DLOCK_READONLY;
        break;
    default: 
        break;
    };

    if (mMapDeviceToBufferResources.size() == 0)
    {
        OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "There are no resources attached to this pixel buffer !!",
            "D3D9HardwarePixelBuffer::lockImpl");   
    }
    
    mLockedBox = lockBox;
    mLockFlags = flags;

    BufferResources* bufferResources = mMapDeviceToBufferResources.begin()->second;
    
    // Lock the source buffer.
    return lockBuffer(bufferResources, lockBox, flags);
}

//-----------------------------------------------------------------------------  
Ogre::PixelBox D3D9HardwarePixelBuffer::lockBuffer(BufferResources* bufferResources, 
                                                   const Image::Box &lockBox, 
                                                   DWORD flags)
{
    // Set extents and format
    // Note that we do not carry over the left/top/front here, since the returned
    // PixelBox will be re-based from the locking point onwards
    PixelBox rval(lockBox.getWidth(), lockBox.getHeight(), lockBox.getDepth(), mFormat);


    if (bufferResources->surface != NULL) 
    {
        // Surface
        D3DLOCKED_RECT lrect; // Filled in by D3D
        HRESULT hr;

        if (lockBox.left == 0 && lockBox.top == 0 
            && lockBox.right == mWidth && lockBox.bottom == mHeight)
        {
            // Lock whole surface
            hr = bufferResources->surface->LockRect(&lrect, NULL, flags);
        }
        else
        {
            RECT prect = toD3DRECT(lockBox); // specify range to lock
            hr = bufferResources->surface->LockRect(&lrect, &prect, flags);
        }
        if (FAILED(hr))     
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Surface locking failed",
            "D3D9HardwarePixelBuffer::lockImpl");
        fromD3DLock(rval, lrect);
    } 
    else if(bufferResources->volume) 
    {
        // Volume
        D3DLOCKED_BOX lbox; // Filled in by D3D
        HRESULT hr;

        if (lockBox.left == 0 && lockBox.top == 0 && lockBox.front == 0 && 
            lockBox.right == mWidth && lockBox.bottom == mHeight && lockBox.back == mDepth)
        {
            hr = bufferResources->volume->LockBox(&lbox, NULL, flags);
        }
        else
        {
            D3DBOX pbox = toD3DBOX(lockBox); // specify range to lock
            hr = bufferResources->volume->LockBox(&lbox, &pbox, flags);
        }
        if (FAILED(hr))     
        {
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Volume locking failed",
                "D3D9HardwarePixelBuffer::lockImpl");
        }
        fromD3DLock(rval, lbox);
    }


    return rval;
}

//-----------------------------------------------------------------------------  
void D3D9HardwarePixelBuffer::unlockImpl(void)
{
    D3D9_DEVICE_ACCESS_CRITICAL_SECTION

    if (mMapDeviceToBufferResources.size() == 0)
    {
        OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "There are no resources attached to this pixel buffer !!",
            "D3D9HardwarePixelBuffer::lockImpl");   
    }

    DeviceToBufferResourcesIterator it;
    
    // 1. Update duplicates buffers.
    it = mMapDeviceToBufferResources.begin();
    ++it;
    while (it != mMapDeviceToBufferResources.end())
    {           
        BufferResources* bufferResources = it->second;
        
        // Update duplicated buffer from the from the locked buffer content.                    
        blitFromMemory(mCurrentLock, mLockedBox, bufferResources);                                      
        ++it;           
    }

    // 2. Unlock the locked buffer.
    it = mMapDeviceToBufferResources.begin();                           
    unlockBuffer( it->second);      
    if(mDoMipmapGen)
        _genMipmaps(it->second->mipTex);    
}

//-----------------------------------------------------------------------------  
void D3D9HardwarePixelBuffer::unlockBuffer(BufferResources* bufferResources)
{
    if(bufferResources->surface) 
    {
        // Surface
        bufferResources->surface->UnlockRect();
    } 
    else if(bufferResources->volume) 
    {
        // Volume
        bufferResources->volume->UnlockBox();
    }
}

//-----------------------------------------------------------------------------  
void D3D9HardwarePixelBuffer::blit(const HardwarePixelBufferSharedPtr &rsrc, 
                                   const Image::Box &srcBox, 
                                   const Image::Box &dstBox)
{
    D3D9_DEVICE_ACCESS_CRITICAL_SECTION

    D3D9HardwarePixelBuffer *src = static_cast<D3D9HardwarePixelBuffer*>(rsrc.get());
    DeviceToBufferResourcesIterator it = mMapDeviceToBufferResources.begin();

    // Update all the buffer copies.
    while (it != mMapDeviceToBufferResources.end())
    {
        BufferResources* srcBufferResources = src->getBufferResources(it->first);
        BufferResources* dstBufferResources = it->second;

        if (srcBufferResources == NULL)
        {
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "There are no matching resources attached to the source pixel buffer !!",
                "D3D9HardwarePixelBuffer::blit");   
        }

        blit(it->first, rsrc, srcBox, dstBox, srcBufferResources, dstBufferResources);
        ++it;
    }
}

//-----------------------------------------------------------------------------  
void D3D9HardwarePixelBuffer::blit(IDirect3DDevice9* d3d9Device, 
                                   const HardwarePixelBufferSharedPtr &rsrc, 
                                   const Image::Box &srcBox, 
                                   const Image::Box &dstBox,
                                   BufferResources* srcBufferResources, 
                                   BufferResources* dstBufferResources)
{
    if(dstBufferResources->surface && srcBufferResources->surface)
    {
        // Surface-to-surface
        RECT dsrcRect = toD3DRECT(srcBox);
        RECT ddestRect = toD3DRECT(dstBox);

        D3DSURFACE_DESC srcDesc;
        if(srcBufferResources->surface->GetDesc(&srcDesc) != D3D_OK)
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Could not get surface information",
            "D3D9HardwarePixelBuffer::blit");

        // If we're blitting from a RTT, try GetRenderTargetData
        // if we're going to try to use GetRenderTargetData, need to use system mem pool
        bool tryGetRenderTargetData = false;
        if ((srcDesc.Usage & D3DUSAGE_RENDERTARGET) != 0
            && srcDesc.MultiSampleType == D3DMULTISAMPLE_NONE)
        {

            // Temp texture
            IDirect3DTexture9 *tmptex;
            IDirect3DSurface9 *tmpsurface;

            if(D3DXCreateTexture(
                d3d9Device,
                srcDesc.Width, srcDesc.Height,
                1, // 1 mip level ie topmost, generate no mipmaps
                0, srcDesc.Format, D3DPOOL_SYSTEMMEM,
                &tmptex
                ) != D3D_OK)
            {
                OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Create temporary texture failed",
                    "D3D9HardwarePixelBuffer::blit");
            }
            if(tmptex->GetSurfaceLevel(0, &tmpsurface) != D3D_OK)
            {
                tmptex->Release();
                OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Get surface level failed",
                    "D3D9HardwarePixelBuffer::blit");
            }
            if(d3d9Device->GetRenderTargetData(srcBufferResources->surface, tmpsurface) == D3D_OK)
            {
                // Hey, it worked
                // Copy from this surface instead
                if(D3DXLoadSurfaceFromSurface(
                    dstBufferResources->surface, NULL, &ddestRect, 
                    tmpsurface, NULL, &dsrcRect,
                    D3DX_DEFAULT, 0) != D3D_OK)
                {
                    tmpsurface->Release();
                    tmptex->Release();
                    OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "D3DXLoadSurfaceFromSurface failed",
                        "D3D9HardwarePixelBuffer::blit");
                }
                tmpsurface->Release();
                tmptex->Release();
                return;
            }

        }

        // Otherwise, try the normal method

        // D3DXLoadSurfaceFromSurface
        if(D3DXLoadSurfaceFromSurface(
            dstBufferResources->surface, NULL, &ddestRect, 
            srcBufferResources->surface, NULL, &dsrcRect,
            D3DX_DEFAULT, 0) != D3D_OK)
        {
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "D3DXLoadSurfaceFromSurface failed",
                "D3D9HardwarePixelBuffer::blit");
        }
    }
    else if(dstBufferResources->volume && srcBufferResources->volume)
    {
        // Volume-to-volume
        D3DBOX dsrcBox = toD3DBOX(srcBox);
        D3DBOX ddestBox = toD3DBOX(dstBox);

        // D3DXLoadVolumeFromVolume
        if(D3DXLoadVolumeFromVolume(
            dstBufferResources->volume, NULL, &ddestBox, 
            srcBufferResources->volume, NULL, &dsrcBox,
            D3DX_DEFAULT, 0) != D3D_OK)
        {
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "D3DXLoadVolumeFromVolume failed",
                "D3D9HardwarePixelBuffer::blit");
        }
    }
    else
    {
        // Software fallback   
        HardwarePixelBuffer::blit(rsrc, srcBox, dstBox);
    }
}

//-----------------------------------------------------------------------------  
void D3D9HardwarePixelBuffer::blitFromMemory(const PixelBox &src, const Image::Box &dstBox)
{   
    D3D9_DEVICE_ACCESS_CRITICAL_SECTION

    DeviceToBufferResourcesIterator it = mMapDeviceToBufferResources.begin();

    while (it != mMapDeviceToBufferResources.end())
    {       
        BufferResources* dstBufferResources = it->second;
        
        blitFromMemory(src, dstBox, dstBufferResources);    
        ++it;
    }
}

//-----------------------------------------------------------------------------  
void D3D9HardwarePixelBuffer::blitFromMemory(const PixelBox &src, const Image::Box &dstBox, BufferResources* dstBufferResources)
{
    // for scoped deletion of conversion buffer
    MemoryDataStreamPtr buf;
    PixelBox converted = src;

    // convert to pixelbuffer's native format if necessary
    if (D3D9Mappings::_getPF(src.format) == D3DFMT_UNKNOWN)
    {
        buf.bind(OGRE_NEW MemoryDataStream(
            PixelUtil::getMemorySize(src.getWidth(), src.getHeight(), src.getDepth(),
            mFormat)));
        converted = PixelBox(src.getWidth(), src.getHeight(), src.getDepth(), mFormat, buf->getPtr());
        PixelUtil::bulkPixelConversion(src, converted);
    }

    size_t rowWidth;
    if (PixelUtil::isCompressed(converted.format))
    {
        // if the row doesn't divide by 4 - there is padding to 4
        if(converted.rowPitch  % 4 > 0)
        {
            converted.rowPitch  += 4 - converted.rowPitch  % 4;
        }

        // D3D wants the width of one row of cells in bytes
        if (converted.format == PF_DXT1)
        {
            // 64 bits (8 bytes) per 4x4 block
            rowWidth = (converted.rowPitch / 4) * 8;
        }
        else
        {
            // 128 bits (16 bytes) per 4x4 block
            rowWidth = (converted.rowPitch / 4) * 16;
        }

    }
    else
    {
        rowWidth = converted.rowPitch * PixelUtil::getNumElemBytes(converted.format);
    }

    if (dstBufferResources->surface)
    {
        RECT destRect, srcRect;
        srcRect = toD3DRECT(converted);
        destRect = toD3DRECT(dstBox);

        if(converted.getWidth() != dstBox.getWidth() || converted.getHeight() != dstBox.getHeight() )
        {
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Source and dest size are different",
                "D3D9HardwarePixelBuffer::blitFromMemory");
        }

        if(D3DXLoadSurfaceFromMemory(dstBufferResources->surface, NULL, &destRect, 
            converted.data, D3D9Mappings::_getPF(converted.format),
            static_cast<UINT>(rowWidth),
            NULL, &srcRect, D3DX_DEFAULT, 0) != D3D_OK)
        {
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "D3DXLoadSurfaceFromMemory failed",
                "D3D9HardwarePixelBuffer::blitFromMemory");
        }
    }
    else if (dstBufferResources->volume)
    {
        D3DBOX destBox, srcBox;
        srcBox = toD3DBOX(converted);
        destBox = toD3DBOX(dstBox);
        size_t sliceWidth;
        if (PixelUtil::isCompressed(converted.format))
        {
            // D3D wants the width of one slice of cells in bytes
            if (converted.format == PF_DXT1)
            {
                // 64 bits (8 bytes) per 4x4 block
                sliceWidth = (converted.slicePitch / 16) * 8;
            }
            else
            {
                // 128 bits (16 bytes) per 4x4 block
                sliceWidth = (converted.slicePitch / 16) * 16;
            }

        }
        else
        {
            sliceWidth = converted.slicePitch * PixelUtil::getNumElemBytes(converted.format);
        }

        if(D3DXLoadVolumeFromMemory(dstBufferResources->volume, NULL, &destBox, 
            converted.data, D3D9Mappings::_getPF(converted.format),
            static_cast<UINT>(rowWidth), static_cast<UINT>(sliceWidth),
            NULL, &srcBox, D3DX_DEFAULT, 0) != D3D_OK)
        {
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "D3DXLoadSurfaceFromMemory failed",
                "D3D9HardwarePixelBuffer::blitFromMemory");
        }
    }

    if(mDoMipmapGen)
        _genMipmaps(dstBufferResources->mipTex);

}

//-----------------------------------------------------------------------------  
void D3D9HardwarePixelBuffer::blitToMemory(const Image::Box &srcBox, const PixelBox &dst)
{
    D3D9_DEVICE_ACCESS_CRITICAL_SECTION

    DeviceToBufferResourcesIterator it = mMapDeviceToBufferResources.begin();
    BufferResources* bufferResources = it->second;

    blitToMemory(srcBox, dst, bufferResources, it->first);
}

//-----------------------------------------------------------------------------  
void D3D9HardwarePixelBuffer::blitToMemory(const Image::Box &srcBox, const PixelBox &dst, 
                                           BufferResources* srcBufferResources,
                                           IDirect3DDevice9* d3d9Device)
{
    // Decide on pixel format of temp surface
    PixelFormat tmpFormat = mFormat; 
    if(D3D9Mappings::_getPF(dst.format) != D3DFMT_UNKNOWN)
    {
        tmpFormat = dst.format;
    }

    if (srcBufferResources->surface)
    {
        assert(srcBox.getDepth() == 1 && dst.getDepth() == 1);
        // Create temp texture
        IDirect3DTexture9 *tmp;
        IDirect3DSurface9 *surface;

        D3DSURFACE_DESC srcDesc;
        if(srcBufferResources->surface->GetDesc(&srcDesc) != D3D_OK)
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Could not get surface information",
            "D3D9HardwarePixelBuffer::blitToMemory");

        D3DPOOL temppool = D3DPOOL_SCRATCH;
        // if we're going to try to use GetRenderTargetData, need to use system mem pool
        bool tryGetRenderTargetData = false;
        if (((srcDesc.Usage & D3DUSAGE_RENDERTARGET) != 0) &&
            (srcBox.getWidth() == dst.getWidth()) && (srcBox.getHeight() == dst.getHeight()) &&
            (srcBox.getWidth() == getWidth()) && (srcBox.getHeight() == getHeight()) &&
            (mFormat == tmpFormat))
        {
            tryGetRenderTargetData = true;
            temppool = D3DPOOL_SYSTEMMEM;
        }

        if(D3DXCreateTexture(
            d3d9Device,
            static_cast<UINT>(dst.getWidth()), static_cast<UINT>(dst.getHeight()), 
            1, // 1 mip level ie topmost, generate no mipmaps
            0, D3D9Mappings::_getPF(tmpFormat), temppool,
            &tmp
            ) != D3D_OK)
        {
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Create temporary texture failed",
                "D3D9HardwarePixelBuffer::blitToMemory");
        }
        if(tmp->GetSurfaceLevel(0, &surface) != D3D_OK)
        {
            tmp->Release();
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Get surface level failed",
                "D3D9HardwarePixelBuffer::blitToMemory");
        }
        // Copy texture to this temp surface
        RECT destRect, srcRect;
        srcRect = toD3DRECT(srcBox);
        destRect = toD3DRECTExtent(dst);

        // Get the real temp surface format
        D3DSURFACE_DESC dstDesc;
        if(surface->GetDesc(&dstDesc) != D3D_OK)
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Could not get surface information",
            "D3D9HardwarePixelBuffer::blitToMemory");
        tmpFormat = D3D9Mappings::_getPF(dstDesc.Format);

        // Use fast GetRenderTargetData if we are in its usage conditions
        bool fastLoadSuccess = false;
        if (tryGetRenderTargetData)
        {
            if(d3d9Device->GetRenderTargetData(srcBufferResources->surface, surface) == D3D_OK)
            {
                fastLoadSuccess = true;
            }
        }
        if (!fastLoadSuccess)
        {
            if(D3DXLoadSurfaceFromSurface(
                surface, NULL, &destRect, 
                srcBufferResources->surface, NULL, &srcRect,
                D3DX_DEFAULT, 0) != D3D_OK)
            {
                surface->Release();
                tmp->Release();
                OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "D3DXLoadSurfaceFromSurface failed",
                    "D3D9HardwarePixelBuffer::blitToMemory");
            }
        }

        // Lock temp surface and copy it to memory
        D3DLOCKED_RECT lrect; // Filled in by D3D
        if(surface->LockRect(&lrect, NULL,  D3DLOCK_READONLY) != D3D_OK)
        {
            surface->Release();
            tmp->Release();
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "surface->LockRect",
                "D3D9HardwarePixelBuffer::blitToMemory");
        }
        // Copy it
        PixelBox locked(dst.getWidth(), dst.getHeight(), dst.getDepth(), tmpFormat);
        fromD3DLock(locked, lrect);
        PixelUtil::bulkPixelConversion(locked, dst);
        surface->UnlockRect();
        // Release temporary surface and texture
        surface->Release();
        tmp->Release();
    }
    else if (srcBufferResources->volume)
    {
        // Create temp texture
        IDirect3DVolumeTexture9 *tmp;
        IDirect3DVolume9 *surface;

        if(D3DXCreateVolumeTexture(
            d3d9Device,
            static_cast<UINT>(dst.getWidth()), 
            static_cast<UINT>(dst.getHeight()), 
            static_cast<UINT>(dst.getDepth()), 0,
            0, D3D9Mappings::_getPF(tmpFormat), D3DPOOL_SCRATCH,
            &tmp
            ) != D3D_OK)
        {
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Create temporary texture failed",
                "D3D9HardwarePixelBuffer::blitToMemory");
        }
        if(tmp->GetVolumeLevel(0, &surface) != D3D_OK)
        {
            tmp->Release();
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "Get volume level failed",
                "D3D9HardwarePixelBuffer::blitToMemory");
        }
        // Volume
        D3DBOX ddestBox, dsrcBox;
        ddestBox = toD3DBOXExtent(dst);
        dsrcBox = toD3DBOX(srcBox);

        if(D3DXLoadVolumeFromVolume(
            surface, NULL, &ddestBox, 
            srcBufferResources->volume, NULL, &dsrcBox,
            D3DX_DEFAULT, 0) != D3D_OK)
        {
            surface->Release();
            tmp->Release();
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "D3DXLoadVolumeFromVolume failed",
                "D3D9HardwarePixelBuffer::blitToMemory");
        }
        // Lock temp surface and copy it to memory
        D3DLOCKED_BOX lbox; // Filled in by D3D
        if(surface->LockBox(&lbox, NULL,  D3DLOCK_READONLY) != D3D_OK)
        {
            surface->Release();
            tmp->Release();
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, "surface->LockBox",
                "D3D9HardwarePixelBuffer::blitToMemory");
        }
        // Copy it
        PixelBox locked(dst.getWidth(), dst.getHeight(), dst.getDepth(), tmpFormat);
        fromD3DLock(locked, lbox);
        PixelUtil::bulkPixelConversion(locked, dst);
        surface->UnlockBox();
        // Release temporary surface and texture
        surface->Release();
        tmp->Release();
    }
}

//-----------------------------------------------------------------------------  
void D3D9HardwarePixelBuffer::_genMipmaps(IDirect3DBaseTexture9* mipTex)
{
    assert(mipTex);

    // Mipmapping
    if (mHWMipmaps)
    {
        // Hardware mipmaps
        mipTex->GenerateMipSubLevels();
    }
    else
    {
        // Software mipmaps
        if( D3DXFilterTexture( mipTex, NULL, D3DX_DEFAULT, D3DX_DEFAULT ) != D3D_OK )
        {
            OGRE_EXCEPT( Exception::ERR_RENDERINGAPI_ERROR, 
            "Failed to filter texture (generate mipmaps)",
             "D3D9HardwarePixelBuffer::_genMipmaps" );
        }
    }

}
//----------------------------------------------------------------------------- 
void D3D9HardwarePixelBuffer::_setMipmapping(bool doMipmapGen, 
                                             bool HWMipmaps)
{   
    mDoMipmapGen = doMipmapGen;
    mHWMipmaps = HWMipmaps; 
}
//-----------------------------------------------------------------------------   
void D3D9HardwarePixelBuffer::_clearSliceRTT(size_t zoffset)
{
    mRenderTexture = NULL;
}

//-----------------------------------------------------------------------------  
void D3D9HardwarePixelBuffer::releaseSurfaces(IDirect3DDevice9* d3d9Device)
{
    BufferResources* bufferResources = getBufferResources(d3d9Device);

    if (bufferResources != NULL)
    {
        SAFE_RELEASE(bufferResources->surface);
        SAFE_RELEASE(bufferResources->volume);
    }
}
//-----------------------------------------------------------------------------   
IDirect3DSurface9* D3D9HardwarePixelBuffer::getSurface(IDirect3DDevice9* d3d9Device)
{
    BufferResources* bufferResources = getBufferResources(d3d9Device);

    if (bufferResources == NULL)
    {
        mOwnerTexture->createTextureResources(d3d9Device);
        bufferResources = getBufferResources(d3d9Device);
    }

    return bufferResources->surface;
}
//-----------------------------------------------------------------------------   
IDirect3DSurface9* D3D9HardwarePixelBuffer::getFSAASurface(IDirect3DDevice9* d3d9Device)
{
    BufferResources* bufferResources = getBufferResources(d3d9Device);

    if (bufferResources == NULL)
    {
        mOwnerTexture->createTextureResources(d3d9Device);
        bufferResources = getBufferResources(d3d9Device);
    }
    
    return bufferResources->fSAASurface;
}
//-----------------------------------------------------------------------------    
RenderTexture *D3D9HardwarePixelBuffer::getRenderTarget(size_t zoffset)
{
    assert(mUsage & TU_RENDERTARGET);
    assert(mRenderTexture != NULL);   
    return mRenderTexture;
}
//-----------------------------------------------------------------------------    
void D3D9HardwarePixelBuffer::updateRenderTexture(bool writeGamma, uint fsaa, const String& srcName)
{
    if (mRenderTexture == NULL)
    {
        String name;
        name = "rtt/" +Ogre::StringConverter::toString((size_t)this) + "/" + srcName;

        mRenderTexture = OGRE_NEW D3D9RenderTexture(name, this, writeGamma, fsaa);      
        Root::getSingleton().getRenderSystem()->attachRenderTarget(*mRenderTexture);
    }
}
//-----------------------------------------------------------------------------    
void D3D9HardwarePixelBuffer::destroyRenderTexture()
{
    if (mRenderTexture != NULL)
    {
        Root::getSingleton().getRenderSystem()->destroyRenderTarget(mRenderTexture->getName());
        mRenderTexture = NULL;
    }
}

};
