source: downloads/ogre/OgreMain/src/OgreShadowTextureManager.cpp @ 44

/*-------------------------------------------------------------------------
This source file is a 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 library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License (LGPL) as 
published by the Free Software Foundation; either version 2.1 of the 
License, or (at your option) any later version.

This library 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 library; 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 "OgreShadowTextureManager.h"
#include "OgreResourceGroupManager.h"
#include "OgreTextureManager.h"
#include "OgreStringConverter.h"
#include "OgreHardwarePixelBuffer.h"

namespace Ogre
{
        //-----------------------------------------------------------------------
        bool operator== ( const ShadowTextureConfig& lhs, const ShadowTextureConfig& rhs )
        {
                if ( lhs.width != rhs.width ||
                        lhs.height != rhs.height ||
                        lhs.format != rhs.format )
                {
                        return false;
                }

                return true;
        }
        //-----------------------------------------------------------------------
        bool operator!= ( const ShadowTextureConfig& lhs, const ShadowTextureConfig& rhs )
        {
                return !( lhs == rhs );
        }
        //-----------------------------------------------------------------------
        template<> ShadowTextureManager* Singleton<ShadowTextureManager>::ms_Singleton = 0;
        ShadowTextureManager* ShadowTextureManager::getSingletonPtr(void)
        {
                return ms_Singleton;
        }
        ShadowTextureManager& ShadowTextureManager::getSingleton(void)
        {
                assert( ms_Singleton );  return ( *ms_Singleton );
        }
        //---------------------------------------------------------------------
        ShadowTextureManager::ShadowTextureManager()
                : mCount(0)
        {

        }
        //---------------------------------------------------------------------
        ShadowTextureManager::~ShadowTextureManager()
        {
                clear();
        }
        //---------------------------------------------------------------------
        void ShadowTextureManager::getShadowTextures(const ShadowTextureConfigList& config, 
                ShadowTextureList& listToPopulate)
        {
                listToPopulate.clear();

                std::set<Texture*> usedTextures;

                for (ShadowTextureConfigList::const_iterator c = config.begin(); c != config.end(); ++c)
                {
                        const ShadowTextureConfig& config = *c;
                        bool found = false;
                        for (ShadowTextureList::iterator t = mTextureList.begin(); t != mTextureList.end(); ++t)
                        {
                                const TexturePtr& tex = *t;
                                // Skip if already used this one
                                if (usedTextures.find(tex.getPointer()) != usedTextures.end())
                                        continue;

                                if (config.width == tex->getWidth() && config.height == tex->getHeight()
                                        && config.format == tex->getFormat())
                                {
                                        // Ok, a match
                                        listToPopulate.push_back(tex);
                                        usedTextures.insert(tex.getPointer());
                                        found = true;
                                        break;
                                }
                        }
                        if (!found)
                        {
                                // Create a new texture
                                static const String baseName = "Ogre/ShadowTexture";
                                String targName = baseName + StringConverter::toString(mCount++);
                                TexturePtr shadowTex = TextureManager::getSingleton().createManual(
                                        targName, 
                                        ResourceGroupManager::INTERNAL_RESOURCE_GROUP_NAME, 
                                        TEX_TYPE_2D, config.width, config.height, 0, config.format, 
                                        TU_RENDERTARGET);
                                // Ensure texture loaded
                                shadowTex->load();
                                listToPopulate.push_back(shadowTex);
                                usedTextures.insert(shadowTex.getPointer());
                                mTextureList.push_back(shadowTex);
                        }
                }

        }
        //---------------------------------------------------------------------
        TexturePtr ShadowTextureManager::getNullShadowTexture(PixelFormat format)
        {
                for (ShadowTextureList::iterator t = mNullTextureList.begin(); t != mNullTextureList.end(); ++t)
                {
                        const TexturePtr& tex = *t;

                        if (format == tex->getFormat())
                        {
                                // Ok, a match
                                return tex;
                        }
                }

                // not found, create a new one
                // A 1x1 texture of the correct format, not a render target
                static const String baseName = "Ogre/ShadowTextureNull";
                String targName = baseName + StringConverter::toString(mCount++);
                TexturePtr shadowTex = TextureManager::getSingleton().createManual(
                        targName, 
                        ResourceGroupManager::INTERNAL_RESOURCE_GROUP_NAME, 
                        TEX_TYPE_2D, 1, 1, 0, format);
                mNullTextureList.push_back(shadowTex);

                // lock & populate the texture based on format
                shadowTex->getBuffer()->lock(HardwareBuffer::HBL_DISCARD);
                const PixelBox& box = shadowTex->getBuffer()->getCurrentLock();

                // set high-values across all bytes of the format
                memset(box.data, 0xFFFF, PixelUtil::getNumElemBytes(format));

                shadowTex->getBuffer()->unlock();

                return shadowTex;
        
        }
        //---------------------------------------------------------------------
        void ShadowTextureManager::clearUnused()
        {
                for (ShadowTextureList::iterator i = mTextureList.begin(); i != mTextureList.end(); )
                {
                        // Unreferenced if only this reference and the resource system
                        // Any cached shadow textures should be re-bound each frame dropping
                        // any old references
                        if ((*i).useCount() == ResourceGroupManager::RESOURCE_SYSTEM_NUM_REFERENCE_COUNTS + 1)
                        {
                                TextureManager::getSingleton().remove((*i)->getHandle());
                                i = mTextureList.erase(i);
                        }
                        else
                        {
                                ++i;
                        }
                }
                for (ShadowTextureList::iterator i = mNullTextureList.begin(); i != mNullTextureList.end(); )
                {
                        // Unreferenced if only this reference and the resource system
                        // Any cached shadow textures should be re-bound each frame dropping
                        // any old references
                        if ((*i).useCount() == ResourceGroupManager::RESOURCE_SYSTEM_NUM_REFERENCE_COUNTS + 1)
                        {
                                TextureManager::getSingleton().remove((*i)->getHandle());
                                i = mNullTextureList.erase(i);
                        }
                        else
                        {
                                ++i;
                        }
                }

        }
        //---------------------------------------------------------------------
        void ShadowTextureManager::clear()
        {
                for (ShadowTextureList::iterator i = mTextureList.begin(); i != mTextureList.end(); ++i)
                {
                        TextureManager::getSingleton().remove((*i)->getHandle());
                }
                mTextureList.clear();

        }
        //---------------------------------------------------------------------

}