C++ OGRE_EXCEPT函数代码示例

//-----------------------------------------------------------------------------
ParameterPtr Function::resolveInputParameter(Parameter::Semantic semantic,
										int index,
										const Parameter::Content content,
										GpuConstantType type)
{
	ParameterPtr param;

	// Check if desired parameter already defined.
	param = getParameterByContent(mInputParameters, content, type);
	if (param.get() != NULL)
		return param;

	// Case we have to create new parameter.
	if (index == -1)
	{
		index = 0;

		// Find the next available index of the target semantic.
		ShaderParameterIterator it;

		for (it = mInputParameters.begin(); it != mInputParameters.end(); ++it)
		{
			if ((*it)->getSemantic() == semantic)
			{
				index++;
			}
		}
	}
	else
	{
		// Check if desired parameter already defined.
		param = getParameterBySemantic(mInputParameters, semantic, index);
		if (param.get() != NULL && param->getContent() == content)
		{
			if (param->getType() == type)
			{
				return param;
			}
			else 
			{
				OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, 
					"Can not resolve parameter - semantic: " + StringConverter::toString(semantic) + " - index: " + StringConverter::toString(index) + " due to type mismatch. Function <" + getName() + ">", 			
					"Function::resolveInputParameter" );
			}
		}
	}

	

	// No parameter found -> create new one.
	switch (semantic)
	{
	case Parameter::SPS_POSITION:	
		assert(type == GCT_FLOAT4);
		param = ParameterFactory::createInPosition(index);
		break;
			
	case Parameter::SPS_BLEND_WEIGHTS:			
	case Parameter::SPS_BLEND_INDICES:
		OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, 
					"Can not resolve parameter - semantic: " + StringConverter::toString(semantic) + " - index: " + StringConverter::toString(index) + " since support in it is not implemented yet. Function <" + getName() + ">", 			
					"Function::resolveInputParameter" );
		break;
			
	case Parameter::SPS_NORMAL:
		assert(type == GCT_FLOAT3);
		param = ParameterFactory::createInNormal(index);
		break;
			
	case Parameter::SPS_COLOR:
		assert(type == GCT_FLOAT4);
		param = ParameterFactory::createInColor(index);
		break;
						
	case Parameter::SPS_TEXTURE_COORDINATES:		
		param = ParameterFactory::createInTexcoord(type, index, content);				
		break;
			
	case Parameter::SPS_BINORMAL:
		assert(type == GCT_FLOAT3);
		param = ParameterFactory::createInBiNormal(index);
		break;
			
	case Parameter::SPS_TANGENT:
		assert(type == GCT_FLOAT3);
		param = ParameterFactory::createInTangent(index);
		break;
	case Parameter::SPS_UNKNOWN:
        break;
	}

	if (param.get() != NULL)
		addInputParameter(param);

	return param;
}

    //---------------------------------------------------------------------
	size_t DeflateStream::read(void* buf, size_t count)
	{
		if (!mIsCompressedValid)
		{
			return mCompressedStream->read(buf, count);
		}
		
		if (getAccessMode() & WRITE)
		{
			return mTmpWriteStream->read(buf, count);
		}
		else 
		{

			size_t restorePoint = mCompressedStream->tell();
			// read from cache first
			size_t cachereads = mReadCache.read(buf, count);
			
			size_t newReadUncompressed = 0;

			if (cachereads < count)
			{
				mZStream->avail_out = count - cachereads;
				mZStream->next_out = (Bytef*)buf + cachereads;
				
				while (mZStream->avail_out)
				{
					// Pull next chunk of compressed data from the underlying stream
					if (!mZStream->avail_in && !mCompressedStream->eof())
					{
						mZStream->avail_in = mCompressedStream->read(mTmp, OGRE_DEFLATE_TMP_SIZE);
						mZStream->next_in = mTmp;
					}
					
					if (mZStream->avail_in)
					{
						int availpre = mZStream->avail_out;
						int status = inflate(mZStream, Z_SYNC_FLUSH);
						size_t readUncompressed = availpre - mZStream->avail_out;
						newReadUncompressed += readUncompressed;
						if (status != Z_OK)
						{
							// End of data, or error
							if (status != Z_STREAM_END)
							{
								mCompressedStream->seek(restorePoint);
								OGRE_EXCEPT(Exception::ERR_INVALID_STATE, 
											"Error in compressed stream",
											"DeflateStrea::read");
							}
							else 
							{
								// back up the stream so that it can be used from the end onwards													
								long unusedCompressed = mZStream->avail_in;
								mCompressedStream->skip(-unusedCompressed);
							}

							break;
						}
					}
				}
			}
			
			// Cache the last bytes read
			mReadCache.cacheData((char*)buf + cachereads, newReadUncompressed);
			
			mCurrentPos += newReadUncompressed + cachereads;
			
			return newReadUncompressed + cachereads;
		}
	}

    //---------------------------------------------------------------------
	void DeflateStream::init()
	{
		mZStream = OGRE_ALLOC_T(z_stream, 1, MEMCATEGORY_GENERAL);
		mZStream->zalloc = OgreZalloc;
		mZStream->zfree = OgreZfree;
		
		if (getAccessMode() == READ)
		{
			mTmp = (unsigned char*)OGRE_MALLOC(OGRE_DEFLATE_TMP_SIZE, MEMCATEGORY_GENERAL);
			size_t restorePoint = mCompressedStream->tell();
			// read early chunk
			mZStream->next_in = mTmp;
			mZStream->avail_in = mCompressedStream->read(mTmp, OGRE_DEFLATE_TMP_SIZE);
			
			if (inflateInit(mZStream) != Z_OK)
			{
				mIsCompressedValid = false;
			}
			else
				mIsCompressedValid = true;
			
			if (mIsCompressedValid)
			{
				// in fact, inflateInit on some implementations doesn't try to read
				// anything. We need to at least read something to test
				Bytef testOut[4];
				size_t savedIn = mZStream->avail_in;
				mZStream->avail_out = 4;
				mZStream->next_out = testOut;
				if (inflate(mZStream, Z_SYNC_FLUSH) != Z_OK)
					mIsCompressedValid = false;
				// restore for reading
				mZStream->avail_in = savedIn;
				mZStream->next_in = mTmp;

				inflateReset(mZStream);
			}

			if (!mIsCompressedValid)
			{
				// Not compressed data!
				// Fail gracefully, fall back on reading the underlying stream direct
				destroy();
				mCompressedStream->seek(restorePoint);
			}				
		}
		else 
		{
            if(mTempFileName.empty())
            {
                // Write to temp file
#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
                char* tmpname = _tempnam(".", "ogre");
                if (!tmpname)
                {
                    // Having no file name here will cause various problems later.
                    OGRE_EXCEPT(Exception::ERR_INTERNAL_ERROR, "Temporary file name generation failed.", "DeflateStream::init");
                }
                else
                {
                    mTempFileName = tmpname;
                    free(tmpname);
                }
#else
                char tmpname[L_tmpnam];
                tmpnam(tmpname);
                mTempFileName = tmpname;
#endif
            }

			std::fstream *f = OGRE_NEW_T(std::fstream, MEMCATEGORY_GENERAL)();
			f->open(mTempFileName.c_str(), std::ios::binary | std::ios::out);
			mTmpWriteStream = DataStreamPtr(OGRE_NEW FileStreamDataStream(f));
			
		}

	}

    RenderTexture *HardwarePixelBuffer::getRenderTarget(size_t)
    {
        OGRE_EXCEPT(Exception::ERR_NOT_IMPLEMENTED,
				"Not yet implemented for this rendersystem.",
				"HardwarePixelBuffer::getRenderTarget");
    }

	//-----------------------------------------------------------------------------
	ManualObject::ManualObjectSection* ManualObject::end(void)
	{
		if (!mCurrentSection)
		{
			OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
				"You cannot call end() until after you call begin()",
				"ManualObject::end");
		}
		if (mTempVertexPending)
		{
			// bake current vertex
			copyTempVertexToBuffer();
		}

		// pointer that will be returned
		ManualObjectSection* result = NULL;

		RenderOperation* rop = mCurrentSection->getRenderOperation();
		// Check for empty content
		if (rop->vertexData->vertexCount == 0 ||
			(rop->useIndexes && rop->indexData->indexCount == 0))
		{
			// You're wasting my time sonny
			if (mCurrentUpdating)
			{
				// Can't just undo / remove since may be in the middle
				// Just allow counts to be 0, will not be issued to renderer

				// return the finished section (though it has zero vertices)
				result = mCurrentSection;
			}
			else
			{
				// First creation, can really undo
				// Has already been added to section list end, so remove
				mSectionList.pop_back();
				OGRE_DELETE mCurrentSection;

			}
		}
		else // not an empty section
		{

			// Bake the real buffers
			HardwareVertexBufferSharedPtr vbuf;
			// Check buffer sizes
			bool vbufNeedsCreating = true;
			bool ibufNeedsCreating = rop->useIndexes;
            // Work out if we require 16 or 32-bit index buffers
            HardwareIndexBuffer::IndexType indexType = mCurrentSection->get32BitIndices()?  
				HardwareIndexBuffer::IT_32BIT : HardwareIndexBuffer::IT_16BIT;
			if (mCurrentUpdating)
			{
				// May be able to reuse buffers, check sizes
				vbuf = rop->vertexData->vertexBufferBinding->getBuffer(0);
				if (vbuf->getNumVertices() >= rop->vertexData->vertexCount)
					vbufNeedsCreating = false;

				if (rop->useIndexes)
				{
					if ((rop->indexData->indexBuffer->getNumIndexes() >= rop->indexData->indexCount) &&
                        (indexType == rop->indexData->indexBuffer->getType()))
						ibufNeedsCreating = false;
				}

			}
			if (vbufNeedsCreating)
			{
				// Make the vertex buffer larger if estimated vertex count higher
				// to allow for user-configured growth area
				size_t vertexCount = std::max(rop->vertexData->vertexCount, 
					mEstVertexCount);
				vbuf =
					HardwareBufferManager::getSingleton().createVertexBuffer(
						mDeclSize,
						vertexCount,
						mDynamic? HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY : 
							HardwareBuffer::HBU_STATIC_WRITE_ONLY);
				rop->vertexData->vertexBufferBinding->setBinding(0, vbuf);
			}
			if (ibufNeedsCreating)
			{
				// Make the index buffer larger if estimated index count higher
				// to allow for user-configured growth area
				size_t indexCount = std::max(rop->indexData->indexCount, 
					mEstIndexCount);
				rop->indexData->indexBuffer =
					HardwareBufferManager::getSingleton().createIndexBuffer(
						indexType,
						indexCount,
						mDynamic? HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY : 
							HardwareBuffer::HBU_STATIC_WRITE_ONLY);
			}
			// Write vertex data
			vbuf->writeData(
				0, rop->vertexData->vertexCount * vbuf->getVertexSize(), 
				mTempVertexBuffer, true);
			// Write index data
			if(rop->useIndexes)
//.........这里部分代码省略.........

 void RenderTarget::getCustomAttribute(const String& name, void* pData)
 {
     OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Attribute not found.", "RenderTarget::getCustomAttribute");
 }

    void EGLWindow::copyContentsToMemory(const PixelBox &dst, FrameBuffer buffer)
    {
		if ((dst.left < 0) || (dst.right > mWidth) ||
			(dst.top < 0) || (dst.bottom > mHeight) ||
			(dst.front != 0) || (dst.back != 1))
		{
			OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
				"Invalid box.",
				"Win32Window::copyContentsToMemory" );
		}

		if (buffer == FB_AUTO)
		{
			buffer = mIsFullScreen? FB_FRONT : FB_BACK;
		}

		GLenum format = GLESPixelUtil::getGLOriginFormat(dst.format);
		GLenum type = GLESPixelUtil::getGLOriginDataType(dst.format);

		if ((format == 0) || (type == 0))
		{
			OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
				"Unsupported format.",
				"GtkEGLWindow::copyContentsToMemory" );
		}


		// Switch context if different from current one
		RenderSystem* rsys = Root::getSingleton().getRenderSystem();
		rsys->_setViewport(this->getViewport(0));

		// Must change the packing to ensure no overruns!
		glPixelStorei(GL_PACK_ALIGNMENT, 1);

		//glReadBuffer((buffer == FB_FRONT)? GL_FRONT : GL_BACK);
		glReadPixels((GLint)dst.left, (GLint)dst.top,
			(GLsizei)dst.getWidth(), (GLsizei)dst.getHeight(),
			format, type, dst.data);

		// restore default alignment
		glPixelStorei(GL_PACK_ALIGNMENT, 4);

		//vertical flip
		{
			size_t rowSpan = dst.getWidth() * PixelUtil::getNumElemBytes(dst.format);
			size_t height = dst.getHeight();
			uchar *tmpData = new uchar[rowSpan * height];
			uchar *srcRow = (uchar *)dst.data, *tmpRow = tmpData + (height - 1) * rowSpan;

			while (tmpRow >= tmpData)
			{
				memcpy(tmpRow, srcRow, rowSpan);
				srcRow += rowSpan;
				tmpRow -= rowSpan;
			}
			memcpy(dst.data, tmpData, rowSpan * height);

			delete [] tmpData;
		}

    }

Ogre::DataStreamPtr MTGACodec::code(Ogre::MemoryDataStreamPtr& input, Ogre::Codec::CodecDataPtr& pData) const
{
	OGRE_EXCEPT(Ogre::Exception::ERR_NOT_IMPLEMENTED,
		"MTGA encoding not supported",
		"MTGACodec::code" ) ;
}

Ogre::Codec::DecodeResult MTGACodec::decode(Ogre::DataStreamPtr& stream) const
{
	// Read 4 character code
	mtga_header_s hdr;
	//uint32 fileType;
	stream->read(&hdr, sizeof(hdr));
	if (LodResource_Bitmap != hdr.magic)
	{
		OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, 
			"This is not a MTGA file!", "MTGACodec::decode");
	}
	
	mtga_pal_s pal[256];
	assert(stream->size() == sizeof(hdr)+hdr.uncompressedSize + sizeof(pal));

	stream->seek(sizeof(mtga_header_s)+hdr.uncompressedSize);
	stream->read(pal,sizeof(pal));

	bool isTransparent = false;
	mtga_pal_s& clr = pal[0];
	if( (clr.r == 0 && clr.g >250 && clr.b > 250) || (clr.r > 250 && clr.g ==0 && clr.b > 250))
		isTransparent = true;


	Ogre::ImageCodec::ImageData* imgData = OGRE_NEW Ogre::ImageCodec::ImageData();
	imgData->format = PF_BYTE_BGRA;
	imgData->width = hdr.width;
	imgData->height = hdr.height;
	imgData->num_mipmaps = 3;
	imgData->depth = 1;

	imgData->size = Image::calculateSize(imgData->num_mipmaps, 1, 
			imgData->width, imgData->height, imgData->depth, imgData->format);
	
	Ogre::MemoryDataStreamPtr pixelData;
	
	pixelData.bind(OGRE_NEW MemoryDataStream(imgData->size));

	// Now deal with the data
	unsigned char* destPtr = pixelData->getPtr();
	stream->seek(sizeof(mtga_header_s));
	size_t width = hdr.width;
	size_t height = hdr.height;
	for(size_t mip = 0; mip <= imgData->num_mipmaps; ++mip)
	{
			for (size_t y = 0; y < height; y ++)
			{
				for (size_t x = 0; x < width; x ++)
				{
					unsigned char idx;
					stream->read(&idx,1);
					mtga_pal_s& clr = pal[idx];
					assert(destPtr-pixelData->getPtr() < imgData->size);
					
					*destPtr++ = clr.b;
					*destPtr++ = clr.g;
					*destPtr++ = clr.r;
					*destPtr++ = (idx == 0 && isTransparent)?0:255;
				}
			}
			width /=2;
			height /=2;

	}
	


	DecodeResult ret;
	ret.first = pixelData;
	ret.second = CodecDataPtr(imgData);
	return ret;
}

    void* GL3PlusHardwareIndexBuffer::lockImpl(size_t offset,
                                            size_t length,
                                            LockOptions options)
    {
        if(mIsLocked)
        {
            OGRE_EXCEPT(Exception::ERR_INTERNAL_ERROR,
                        "Invalid attempt to lock an index buffer that has already been locked",
                        "GL3PlusHardwareIndexBuffer::lock");
        }

        void* retPtr = 0;
        GLenum access = 0;
//		GL3PlusHardwareBufferManager* glBufManager = static_cast<GL3PlusHardwareBufferManager*>(HardwareBufferManager::getSingletonPtr());
//
//        // Try to use scratch buffers for smaller buffers
//        if(length < glBufManager->getGLMapBufferThreshold())
//        {
//            retPtr = glBufManager->allocateScratch((uint32)length);
//            if (retPtr)
//            {
//                mLockedToScratch = true;
//                mScratchOffset = offset;
//                mScratchSize = length;
//                mScratchPtr = retPtr;
//                mScratchUploadOnUnlock = (options != HBL_READ_ONLY);
//
//                if (options != HBL_DISCARD)
//                {
//					// have to read back the data before returning the pointer
//                    readData(offset, length, retPtr);
//                }
//            }
//        }

		if (!retPtr)
		{
            OGRE_CHECK_GL_ERROR(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mBufferId));

			// Use glMapBuffer
			if (mUsage & HBU_WRITE_ONLY)
            {
				access |= GL_MAP_WRITE_BIT;
                access |= GL_MAP_FLUSH_EXPLICIT_BIT;
                if(options == HBL_DISCARD || options == HBL_NO_OVERWRITE)
                {
                    // Discard the buffer
                    access |= GL_MAP_INVALIDATE_RANGE_BIT;
                }
                // We explicitly flush when the buffer is unlocked
                access |= GL_MAP_UNSYNCHRONIZED_BIT;
            }
			else if (options == HBL_READ_ONLY)
				access |= GL_MAP_READ_BIT;
			else
				access |= GL_MAP_READ_BIT | GL_MAP_WRITE_BIT;


            void* pBuffer;
            OGRE_CHECK_GL_ERROR(pBuffer = glMapBufferRange(GL_ELEMENT_ARRAY_BUFFER, offset, length, access));

			if(pBuffer == 0)
			{
				OGRE_EXCEPT(Exception::ERR_INTERNAL_ERROR, 
					"Index Buffer: Out of memory", 
					"GL3PlusHardwareIndexBuffer::lock");
			}

			// return offsetted
			retPtr = static_cast<void*>(static_cast<unsigned char*>(pBuffer) + offset);

			mLockedToScratch = false;
		}
		mIsLocked = true;
        return retPtr;
    }

//-----------------------------------------------------------------------
void Compositor::createGlobalTextures()
{
    static size_t dummyCounter = 0;
    if (mSupportedTechniques.empty())
        return;

    //To make sure that we are consistent, it is demanded that all composition
    //techniques define the same set of global textures.

    typedef std::set<String> StringSet;
    StringSet globalTextureNames;

    //Initialize global textures from first supported technique
    CompositionTechnique* firstTechnique = mSupportedTechniques[0];

    CompositionTechnique::TextureDefinitionIterator texDefIt =
        firstTechnique->getTextureDefinitionIterator();
    while (texDefIt.hasMoreElements())
    {
        CompositionTechnique::TextureDefinition* def = texDefIt.getNext();
        if (def->scope == CompositionTechnique::TS_GLOBAL)
        {
            //Check that this is a legit global texture
            if (!def->refCompName.empty())
            {
                OGRE_EXCEPT(Exception::ERR_INVALID_STATE,
                            "Global compositor texture definition can not be a reference",
                            "Compositor::createGlobalTextures");
            }
            if (def->width == 0 || def->height == 0)
            {
                OGRE_EXCEPT(Exception::ERR_INVALID_STATE,
                            "Global compositor texture definition must have absolute size",
                            "Compositor::createGlobalTextures");
            }
            if (def->pooled)
            {
                LogManager::getSingleton().logMessage(
                    "Pooling global compositor textures has no effect");
            }
            globalTextureNames.insert(def->name);

            //TODO GSOC : Heavy copy-pasting from CompositorInstance. How to we solve it?

            /// Make the tetxure
            RenderTarget* rendTarget;
            if (def->formatList.size() > 1)
            {
                String MRTbaseName = "c" + StringConverter::toString(dummyCounter++) +
                                     "/" + mName + "/" + def->name;
                MultiRenderTarget* mrt =
                    Root::getSingleton().getRenderSystem()->createMultiRenderTarget(MRTbaseName);
                mGlobalMRTs[def->name] = mrt;

                // create and bind individual surfaces
                size_t atch = 0;
                for (PixelFormatList::iterator p = def->formatList.begin();
                        p != def->formatList.end(); ++p, ++atch)
                {

                    String texname = MRTbaseName + "/" + StringConverter::toString(atch);
                    TexturePtr tex;

                    tex = TextureManager::getSingleton().createManual(
                              texname,
                              ResourceGroupManager::INTERNAL_RESOURCE_GROUP_NAME, TEX_TYPE_2D,
                              (uint)def->width, (uint)def->height, 0, *p, TU_RENDERTARGET, 0,
                              def->hwGammaWrite && !PixelUtil::isFloatingPoint(*p), def->fsaa);

                    RenderTexture* rt = tex->getBuffer()->getRenderTarget();
                    rt->setAutoUpdated(false);
                    mrt->bindSurface(atch, rt);

                    // Also add to local textures so we can look up
                    String mrtLocalName = getMRTTexLocalName(def->name, atch);
                    mGlobalTextures[mrtLocalName] = tex;

                }

                rendTarget = mrt;
            }
            else
            {
                String texName =  "c" + StringConverter::toString(dummyCounter++) +
                                  "/" + mName + "/" + def->name;

                // space in the name mixup the cegui in the compositor demo
                // this is an auto generated name - so no spaces can't hart us.
                std::replace( texName.begin(), texName.end(), ' ', '_' );

                TexturePtr tex;
                tex = TextureManager::getSingleton().createManual(
                          texName,
                          ResourceGroupManager::INTERNAL_RESOURCE_GROUP_NAME, TEX_TYPE_2D,
                          (uint)def->width, (uint)def->height, 0, def->formatList[0], TU_RENDERTARGET, 0,
                          def->hwGammaWrite && !PixelUtil::isFloatingPoint(def->formatList[0]), def->fsaa);


                rendTarget = tex->getBuffer()->getRenderTarget();
//.........这里部分代码省略.........

	Ogre::RenderToVertexBufferSharedPtr GLES2DefaultHardwareBufferManagerBase::createRenderToVertexBuffer( void )
	{
        OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR,
                "Cannot create RenderToVertexBuffer in GLES2DefaultHardwareBufferManagerBase", 
                "GLES2DefaultHardwareBufferManagerBase::createRenderToVertexBuffer");
	}

    //-----------------------------------------------------------------------
    DataStreamPtr FileSystemArchive::open(const String& filename, bool readOnly) const
    {
		String full_path = concatenate_path(mName, filename);

		// Use filesystem to determine size 
		// (quicker than streaming to the end and back)
		struct stat tagStat;
		int ret = stat(full_path.c_str(), &tagStat);
		assert(ret == 0 && "Problem getting file size" );
        (void)ret;  // Silence warning

		// Always open in binary mode
		// Also, always include reading
		std::ios::openmode mode = std::ios::in | std::ios::binary;
		std::istream* baseStream = 0;
		std::ifstream* roStream = 0;
		std::fstream* rwStream = 0;

        if (!readOnly && isReadOnly())
        {
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
                        "Cannot open a file in read-write mode in a read-only archive",
                        "FileSystemArchive::open");
        }

		if (!readOnly)
		{
			mode |= std::ios::out;
			rwStream = OGRE_NEW_T(std::fstream, MEMCATEGORY_GENERAL)();
			rwStream->open(full_path.c_str(), mode);
			baseStream = rwStream;
		}
		else
		{
			roStream = OGRE_NEW_T(std::ifstream, MEMCATEGORY_GENERAL)();
			roStream->open(full_path.c_str(), mode);
			baseStream = roStream;
		}


		// Should check ensure open succeeded, in case fail for some reason.
		if (baseStream->fail())
		{
			OGRE_DELETE_T(roStream, basic_ifstream, MEMCATEGORY_GENERAL);
			OGRE_DELETE_T(rwStream, basic_fstream, MEMCATEGORY_GENERAL);
			OGRE_EXCEPT(Exception::ERR_FILE_NOT_FOUND,
				"Cannot open file: " + filename,
				"FileSystemArchive::open");
		}

		/// Construct return stream, tell it to delete on destroy
		FileStreamDataStream* stream = 0;
		if (rwStream)
		{
			// use the writeable stream 
			stream = OGRE_NEW FileStreamDataStream(filename,
				rwStream, (size_t)tagStat.st_size, true);
		}
		else
		{
			// read-only stream
			stream = OGRE_NEW FileStreamDataStream(filename,
				roStream, (size_t)tagStat.st_size, true);
		}
		return DataStreamPtr(stream);
    }

void TreeLoader2D::addTree(Entity *entity, const Vector3 &position, Degree yaw, Real scale, void* userData)
{
	//First convert the coordinate to PagedGeometry's local system
	#ifdef PAGEDGEOMETRY_ALTERNATE_COORDSYSTEM
	Vector3 pos = geom->_convertToLocal(position);
	#else
	Vector3 pos = position;
	#endif

	//Check that the tree is within bounds (DEBUG)
	#ifdef _DEBUG
	const Real smallVal = 0.01f;
	if (pos.x < actualBounds.left-smallVal || pos.x > actualBounds.right+smallVal || pos.z < actualBounds.top-smallVal || pos.z > actualBounds.bottom+smallVal)
		OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Tree position is out of bounds", "TreeLoader::addTree()");
	if (scale < minimumScale || scale > maximumScale)
		OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Tree scale out of range", "TreeLoader::addTree()");
	#endif

	//If the tree is slightly out of bounds (due to imprecise coordinate conversion), fix it
	if (pos.x < actualBounds.left)
		pos.x = actualBounds.left;
	else if (pos.x > actualBounds.right)
		pos.x = actualBounds.right;

	if (pos.z < actualBounds.top)
		pos.z = actualBounds.top;
	else if (pos.z > actualBounds.bottom)
		pos.z = actualBounds.bottom;

	//Real x = pos.x;
	//Real z = pos.z;

   std::vector<TreeDef> *pageGrid = 0;
	//Find the appropriate page grid for the entity
	PageGridListIterator i = pageGridList.find(entity);
	if (i != pageGridList.end())
		pageGrid = i->second;   // If it exists, get the page grid
   else
   {
		// If it does not exist, create a new page grid
		pageGrid = new std::vector<TreeDef>[pageGridX * pageGridZ];
		// Register the new page grid in the pageGridList for later retrieval
		pageGridList.insert(PageGridListValue(entity, pageGrid));
	}

	//Calculate the gridbounds-relative position of the tree
	Real xrel = pos.x - gridBounds.left;
	Real zrel = pos.z - gridBounds.top;

	//Get the appropriate grid element based on the new tree's position
	int pageX = (int)Math::Floor(xrel / pageSize); // bad perfomance float --> int
	int pageZ = (int)Math::Floor(zrel / pageSize); // bad perfomance float --> int
	std::vector<TreeDef> &treeList = _getGridPage(pageGrid, pageX, pageZ);

	//Create the new tree
	TreeDef tree;
	tree.xPos      = static_cast<uint16>(0xFFFF * (xrel - (pageX * pageSize)) / pageSize);
	tree.zPos      = static_cast<uint16>(0xFFFF * (zrel - (pageZ * pageSize)) / pageSize);
   tree.rotation  = static_cast<uint8>(Ogre::Real(0.708) * yaw.valueDegrees());                       // 0.708 ~= 255 / 360
   tree.scale     = static_cast<uint8>(Ogre::Real(255.) * ((scale - minimumScale) / maximumScale));

#ifdef PAGEDGEOMETRY_USER_DATA
	tree.userData = userData;
#endif

	//Add it to the tree list
	treeList.push_back(tree);

	//Rebuild geometry if necessary
	geom->reloadGeometryPage(Vector3(pos.x, 0, pos.z));
}

	//Changed the constructor to a member function so that the
	//native constructor would be called first. This member
	//function is then called from the native constructor.
    void EGLPBuffer::initEGLPBuffer()
    {

//	These are now initialized in the native constructors.
//	mGLSupport = glsupport;
//        mGlDisplay = mGLSupport->getGLDisplay();
        mEglDrawable = 0;
        ::EGLConfig glConfig = 0;

        bool isFloat = false;
        int bits = 0;

        switch (mFormat)
        {
            case PCT_BYTE:
                bits = 8;
                break;

            case PCT_SHORT:
            case PCT_FLOAT16:
                bits = 16;
                break;

            case PCT_FLOAT32:
                bits = 32;
                break;

            default:
                break;
        }

        if (mFormat == PCT_FLOAT16 || mFormat == PCT_FLOAT32)
        {
            OGRE_EXCEPT(Exception::ERR_NOT_IMPLEMENTED,
                        "No support for Floating point PBuffers",
                        "EGLRenderTexture::initEGLPBuffer");
        }

        EGLint minAttribs[] = {
            EGL_SURFACE_TYPE, EGL_WINDOW_BIT | EGL_PBUFFER_BIT,
            EGL_DEPTH_SIZE, 16,
            EGL_NONE
        };

        EGLint maxAttribs[] = {
            EGL_RED_SIZE, bits,
            EGL_GREEN_SIZE, bits,
            EGL_BLUE_SIZE, bits,
            EGL_ALPHA_SIZE, bits,
            EGL_STENCIL_SIZE, INT_MAX,
            EGL_NONE
        };

        EGLint pBufferAttribs[] = {
			// First we specify the width of the surface...
            EGL_WIDTH, mWidth,
			// ...then the height of the surface...
            EGL_HEIGHT, mHeight,
			/* ... then we specify the target for the texture
			that will be created when the pbuffer is created...*/
			EGL_TEXTURE_TARGET, EGL_TEXTURE_2D,
			/*..then the format of the texture that will be created
			when the pBuffer is bound to a texture...*/
            EGL_TEXTURE_FORMAT, EGL_TEXTURE_RGB,
			// The final thing is EGL_NONE which signifies the end.
            EGL_NONE
        };


        glConfig = mGLSupport->selectGLConfig(minAttribs, maxAttribs);

        EGL_CHECK_ERROR;
        mEglDrawable = eglCreatePbufferSurface(mGlDisplay, glConfig, pBufferAttribs);
        EGL_CHECK_ERROR;

        if (!glConfig || !mEglDrawable)
        {
            OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR,
                        "Unable to create Pbuffer",
                        "EGLPBuffer::EGLPBuffer");
        }
        EGLint glConfigID;
        EGLint iWidth, iHeight;

        eglGetConfigAttrib(mGlDisplay, glConfig, EGL_CONFIG_ID, &glConfigID);
        EGL_CHECK_ERROR;
        eglQuerySurface(mGlDisplay, mEglDrawable, EGL_WIDTH, &iWidth);
        EGL_CHECK_ERROR;
        eglQuerySurface(mGlDisplay, mEglDrawable, EGL_HEIGHT, &iHeight);
        EGL_CHECK_ERROR;

        mWidth = iWidth;
        mHeight = iHeight;
        LogManager::getSingleton().logMessage(LML_NORMAL, "EGLPBuffer::create used final dimensions " + StringConverter::toString(mWidth) + " x " + StringConverter::toString(mHeight));
        LogManager::getSingleton().logMessage("EGLPBuffer::create used FBConfigID " + StringConverter::toString(glConfigID));

    }