source: downloads/OgreMain/src/OgreRenderTexture.cpp @ 3

/*
-----------------------------------------------------------------------------
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.
-----------------------------------------------------------------------------
*/
#include "OgreStableHeaders.h"

#include "OgreRenderTexture.h"
#include "OgreException.h"
#include "OgreHardwarePixelBuffer.h"
#include "OgreImage.h"
#include "OgreImageCodec.h"

namespace Ogre
{

    //-----------------------------------------------------------------------------
        RenderTexture::RenderTexture(HardwarePixelBuffer *buffer, size_t zoffset):
                mBuffer(buffer), mZOffset(zoffset)
    {
        mPriority = OGRE_REND_TO_TEX_RT_GROUP;
                mWidth = static_cast<unsigned int>(mBuffer->getWidth());
                mHeight = static_cast<unsigned int>(mBuffer->getHeight());
        mColourDepth = static_cast<unsigned int>(
                        Ogre::PixelUtil::getNumElemBits(mBuffer->getFormat()));
    }
    RenderTexture::~RenderTexture()
    {
                mBuffer->_clearSliceRTT(0);
    }

        void RenderTexture::writeContentsToFile( const String & filename )
    {
                // copyToMemory
        ImageCodec::ImageData *imgData = new ImageCodec::ImageData();
        
        imgData->width = mWidth;
        imgData->height = mHeight;
                imgData->depth = 1;
        imgData->format = PF_BYTE_RGBA;
                size_t size = imgData->width * imgData->height * 4;

        // Allocate buffer 
        uchar* pBuffer = new uchar[size];

        // Read pixels
        mBuffer->blitToMemory(
                        Box(0,0,mZOffset,mWidth,mHeight,mZOffset+1), 
                        PixelBox(mWidth, mHeight, 1, imgData->format, pBuffer)
                );

        // Wrap buffer in a chunk
        MemoryDataStreamPtr stream(new MemoryDataStream(
            pBuffer, size, false));

        // Get codec 
        size_t pos = filename.find_last_of(".");
            String extension;
        if( pos == String::npos )
            OGRE_EXCEPT(
                Exception::ERR_INVALIDPARAMS, 
            "Unable to determine image type for '" + filename + "' - invalid extension.",
                "GLRenderTexture::writeContentsToFile" );

        while( pos != filename.length() - 1 )
            extension += filename[++pos];

        // Get the codec
        Codec * pCodec = Codec::getCodec(extension);

        // Write out
        Codec::CodecDataPtr codecDataPtr(imgData);
        pCodec->codeToFile(stream, filename, codecDataPtr);

                delete [] pBuffer;
    }
        //-----------------------------------------------------------------------------
        MultiRenderTarget::MultiRenderTarget(const String &name)
    {
        mPriority = OGRE_REND_TO_TEX_RT_GROUP;
                mName = name;
                /// Width and height is unknown with no targets attached
                mWidth = mHeight = 0;
    }
        //-----------------------------------------------------------------------------
        void MultiRenderTarget::writeContentsToFile( const String & filename )
        {
                OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, 
                                "Cannot write MultiRenderTargets to disk",
                "MultiRenderTarget::writeContentsToFile");
        }

}