source: downloads/ogre/RenderSystems/Direct3D9/src/OgreD3D9MultiRenderTarget.cpp @ 48

/*
-----------------------------------------------------------------------------
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 "OgreD3D9MultiRenderTarget.h"
#include "OgreD3D9HardwarePixelBuffer.h"
#include "OgreException.h"
#include "OgreLogManager.h"
#include "OgreStringConverter.h"
#include "OgreBitwise.h"
#include "OgreD3D9RenderSystem.h"
#include "OgreRoot.h"

namespace Ogre 
{
        D3D9MultiRenderTarget::D3D9MultiRenderTarget(const String &name):
                MultiRenderTarget(name)
        {
                /// Clear targets
                for(size_t x=0; x<OGRE_MAX_MULTIPLE_RENDER_TARGETS; ++x)
                {
                        targets[x] = 0;
                }
        }
        D3D9MultiRenderTarget::~D3D9MultiRenderTarget()
        {
        }

        void D3D9MultiRenderTarget::bindSurface(size_t attachment, RenderTexture *target)
        {
                assert(attachment<OGRE_MAX_MULTIPLE_RENDER_TARGETS);
                /// Get buffer and surface to bind to
                D3D9HardwarePixelBuffer *buffer = 0;
                target->getCustomAttribute("BUFFER", &buffer);
                assert(buffer);

                /// Find first non-null target
                int y;
                for(y=0; y<OGRE_MAX_MULTIPLE_RENDER_TARGETS && !targets[y]; ++y) ;
                
                if(y!=OGRE_MAX_MULTIPLE_RENDER_TARGETS)
                {
                        /// If there is another target bound, compare sizes
                        if(targets[y]->getWidth() != buffer->getWidth() ||
                                targets[y]->getHeight() != buffer->getHeight() ||
                                PixelUtil::getNumElemBits(targets[y]->getFormat()) != 
                                        PixelUtil::getNumElemBits(buffer->getFormat()))
                        {
                                OGRE_EXCEPT(
                                        Exception::ERR_INVALIDPARAMS, 
                                        "MultiRenderTarget surfaces are not of same size or bit depth", 
                                        "D3D9MultiRenderTarget::bindSurface"
                                );
                        }
                }

                targets[attachment] = buffer;
                checkAndUpdate();
        }

        void D3D9MultiRenderTarget::unbindSurface(size_t attachment)
        {
                assert(attachment<OGRE_MAX_MULTIPLE_RENDER_TARGETS);
                targets[attachment] = 0;
                checkAndUpdate();
        }

    void D3D9MultiRenderTarget::update(void)
    {
        D3D9RenderSystem* rs = static_cast<D3D9RenderSystem*>(
            Root::getSingleton().getRenderSystem());
        if (rs->isDeviceLost())
            return;

        MultiRenderTarget::update();
    }

        void D3D9MultiRenderTarget::getCustomAttribute(const String& name, void *pData)
    {
                if(name == "DDBACKBUFFER")
        {
            IDirect3DSurface9 ** pSurf = (IDirect3DSurface9 **)pData;
                        /// Transfer surfaces
                        for(size_t x=0; x<OGRE_MAX_MULTIPLE_RENDER_TARGETS; ++x)
                        {
                                if(targets[x])
                                        pSurf[x] = targets[x]->getSurface();
                        }
                        return;
        }
        }

        void D3D9MultiRenderTarget::checkAndUpdate()
        {
                if(targets[0])
                {
                        mWidth = targets[0]->getWidth();
                        mHeight = targets[0]->getHeight();
                }
                else
                {
                        mWidth = 0;
                        mHeight = 0;
                }
        }


}